JP2018055304A - Code reading device, control program and control method - Google Patents

Abstract

[Configuration] The reading device (10) includes a CPU (20). Under an instruction of the CPU (20), a reading range (200) is set so as to surround each of a plurality of reference bar codes in an initial setting process. The output order of the reading range 200 is set. When the barcode is decoded from the photographed image after the initial setting process is completed, the image included in the reading range (200) is decoded according to the set output order, and the decoded barcode information is output. [Effect] Data arrangement work after reading a code becomes unnecessary, and the time required for the reading process can be shortened. [Selection] Figure 9

Description

  The present invention relates to a code reading device, a control program, and a control method, and more particularly, to a code reading device, a control program, and a control method that collectively read a plurality of codes.

  An example of background art is disclosed in Patent Document 1. In the barcode symbol reading apparatus disclosed in Patent Document 1, a plurality of barcode symbol reading processes are executed.

  In the reading process, a plurality of barcode symbols are collectively imaged, and a plurality of barcode symbol areas are extracted from the acquired digital multi-valued image. Thereafter, a decoding process is performed for each of the plurality of barcode symbol areas.

  When the decoding process is executed, information about the number of digits of the barcode symbol or the size of the barcode symbol and the barcode symbol type information are stored. When multiple barcode symbols are read, the output order of the barcode symbol data is set according to the number of digits of the barcode symbol or the size of the barcode symbol and the barcode symbol type information. The

JP 2014-219775 A

  However, the technique of Patent Document 1 has a problem that it takes time for processing because it is necessary to replace a plurality of barcode symbols read from a captured image on the application side that has received the plurality of barcode symbols.

  Therefore, a main object of the present invention is to provide a novel code reader, control program, and control method.

  Another object of the present invention is to provide a code reading device, a control program, and a control method that eliminate the need for data arrangement work after reading codes and reduce the time required for reading processing.

  A first invention is a code reading device that reads a plurality of codes at a time, and includes a captured image acquisition unit, a storage unit, an image extraction unit, and a decoding unit. The captured image acquisition unit captures an image including a plurality of codes. The captured image captured by the captured image acquisition unit is binarized and converted into a binary image. The storage unit stores code reading information including a plurality of reading ranges set for a captured image captured by the captured image acquisition unit and a reading order of each of the plurality of reading ranges. The reading range may be set by a user instruction or may be set automatically. The reading order of each of the plurality of reading ranges is set, for example, in the order in which the plurality of reading ranges are selected by the user. The image extraction unit extracts each of the images included in the plurality of reading ranges from the captured images captured by the captured image acquisition unit in an order according to the reading order. A decoding part decodes the code | symbol contained in each image in the order extracted by the image extraction part.

  According to the first invention, each of the images included in the plurality of reading ranges is extracted in the order according to the reading order, and the code included in each image is decoded in the extracted order. This eliminates the need for data arrangement work after reading the code, and shortens the time required for the reading process.

  A second invention is a code reading device subordinate to the first invention, wherein the decoding unit decodes the code when the code included in the image extracted by the extraction unit is located within the reading range. .

  According to the second aspect of the present invention, for codes attached to other types of articles having codes attached to positions different from the subject (article) used when setting the reading range, the codes are decoded. There is nothing. For this reason, even if other types of articles are erroneously read, the codes are not decoded, so that it is not necessary to organize the data decoded in error, and the time-consuming work can be reduced.

  A third invention is a code reading device subordinate to the first or second invention, wherein the photographic image taken by the photographic image acquisition unit and the plurality of reading ranges are matched so that the positions and orientations thereof are matched. It further includes a changing unit that changes at least one of the position and orientation of the image and the plurality of reading ranges.

  According to the third invention, when the captured image acquisition unit captures an image, the code can be decoded even if there is an error in at least one of the position and orientation of the captured image and the plurality of reading ranges. it can.

  A fourth invention is a code reading device subordinate to the third invention, and the changing unit moves the positions of the plurality of reading ranges onto the image including the code in the photographed image.

  According to the fourth aspect of the present invention, the code can be decoded even when the captured image and the plurality of reading ranges are different in position.

  A fifth invention is a code reading device subordinate to the third or fourth invention, wherein the changing unit changes the size of a plurality of codes included in the photographed image.

  According to the fifth aspect, the code can be decoded even when the captured image and the plurality of reading ranges are different in size.

  A sixth invention is a code reading device subordinate to any one of the first to fifth inventions, and is set by a reading range setting unit and a reading range setting unit for setting a plurality of reading ranges corresponding to a plurality of codes. An order setting unit for setting the reading order of each of the plurality of reading ranges, and each of the reading positions set by the reading range setting unit and the reading positions set by the order setting unit. A code reading information generating unit that generates code reading information including each reading order is further provided.

  According to the sixth aspect, similarly to the first aspect, the data organization work after reading the code is unnecessary, and the time required for the reading process can be shortened.

  A seventh invention is a control program executed by a code reader that reads a plurality of codes at once, and an image acquisition step of acquiring a captured image obtained by capturing an image including a plurality of codes in a processor of the code reader A storage step for storing a plurality of reading ranges set for a captured image acquired in the image acquisition step and a reading order of each of the plurality of reading ranges; a captured image acquired in the image acquisition step Among these, an image extraction step for extracting each of the images included in the plurality of reading ranges in an order according to the reading order, and a decoding step for decoding the code included in each image in the order extracted in the image extraction step are executed.

  The eighth invention includes a storage unit that stores code reading information including a plurality of reading ranges, reading positions of the reading ranges, and reading orders of the reading ranges, and the plurality of codes are stored once. (A) a step of obtaining a photographed image obtained by photographing an image including a plurality of codes, (b) a method for controlling the photographed image obtained in step (a). Code reading information including a plurality of reading ranges and a reading order of each of the plurality of reading ranges is stored, and (c) among the captured images acquired in step (a), each of the images included in the plurality of reading ranges is stored. , Extracting in the order according to the reading order, and (d) decoding the codes included in each image in the order extracted in step (c).

  In the seventh and eighth inventions, similarly to the first invention, the data organization work after reading the codes is unnecessary, and the time required for the reading process can be shortened.

  According to the present invention, it is not necessary to organize data after reading the code, and the time required for the reading process can be shortened.

FIG. 1A is an illustrative view showing an example of the appearance of the code reading device from the front surface, and FIG. 1B is an illustrative view showing an example of the appearance of the code reading device from the back surface. FIG. 2 is a block diagram showing an example of the electrical configuration of the code reader shown in FIGS. 1 (A) and 1 (B). FIG. 3 is an illustrative view showing one example of a basic screen displayed on the code reading device. FIG. 4 is an illustrative view showing one example of a photographed image photographed by the imaging device. FIG. 5 is an illustrative view showing the relationship between the reference bar code and the reading range. FIG. 6 is an illustrative view showing the position of the set reading range. FIG. 7 is an illustrative view showing one example of a table in which the position of the reading range and the output order are described. FIG. 8 is an illustrative view showing one example of a memory map of the RAM shown in FIG. FIG. 9 is a flowchart showing an example of the main processing of the CPU shown in FIG. FIG. 10 is a flowchart showing an example of the reading process of the CPU shown in FIG. FIG. 11A is an illustrative view showing a case where the barcode included in the photographed image is located within the set reading range 200, and FIG. 11B shows the barcode included in the photographed image. FIG. 10 is an illustrative view showing a case where the reading position is not within a set reading range 200. FIG. 12 is a flowchart showing an example of the reading process in the second embodiment. FIGS. 13A to 13D are illustrative views showing an example of changing the position or / and the size of the barcode in the captured image in the third embodiment. FIGS. 14A to 14D are illustrative views showing an example of changing the direction of the barcode in the photographed image in the third embodiment. FIG. 15 is a flowchart showing an example of the reading process in the third embodiment.

[First embodiment]
FIG. 1A is an illustrative view showing an example of the external configuration of the reading device 10 according to the first embodiment of the present invention as viewed from the front surface. FIG. 1B shows an example of the external configuration of the reading device 10 from the back surface. It is the illustration figure which saw.

  The code reader 10 reads a plurality of codes that are optically readable and represent data in a predetermined format, detects a code signal of each code, and a code information signal represented by the code from the detected code signal Play each one. For example, the code reader 10 is a hand-held bar code reader or bar code scanner. Thus, for example, a readable code is a one-dimensional barcode. The code signal is an image signal representing the shape of a one-dimensional barcode, and the code information signal is a numerical code signal.

  However, the code reading device 10 is not limited to a hand-held type, and may be a stationary reader or scanner. The readable code is not limited to a one-dimensional bar code, and may be a two-dimensional code.

  As shown in FIG. 1A, a code reading device (hereinafter simply referred to as “reading device”) 10 includes a casing 12 having a vertically long rectangular shape when viewed from the front. A display device 14 and an input device 16 are provided on the surface side of the housing 12. Moreover, the housing | casing 12 is formed in the magnitude | size which a user can have with one hand. In addition, the shape and size of the housing | casing 12 are examples, and should not be limited.

  The display device 14 is an LCD with a touch panel, and is arranged so that the display surface is exposed from the housing 12. However, an organic EL may be used instead of the LCD. The touch panel is a general-purpose touch panel, and an arbitrary type such as a capacitance method, an electromagnetic induction method, a resistance film method, and an infrared method can be used.

  The input device 16 is a hardware key, and includes a scan key 16a, an OK (decision) key 16b, a cursor key 16c, a clear key 16d, a power key 16e, and a numeric key (ten key) 16f in the first embodiment.

  The scan key 16a is used to input a barcode reading instruction (reading process execution instruction). The OK key 16b is used to determine execution of various settings and various processes (excluding barcode reading processes). The cursor key 16c is used to move a cursor displayed on the display device 14 or to select an object such as an icon displayed on the display device 14.

  The clear key 16d is used to clear (reset) various settings. The power key 16e is used to turn on / off the main power supply of the reading apparatus 10. The number key 16f is used for inputting a number.

  As illustrated in FIG. 1B, an imaging device 18 is provided on the back surface side of the housing 12 and on the opposite side of the display device 14. Although illustration and detailed description are omitted, the imaging device 18 includes an imaging device, an irradiation device, and an image processing circuit. The image sensor is a CCD or a CMOS. The irradiation apparatus is an apparatus that irradiates a laser beam, and irradiates a subject with a rectangular frame laser beam for instructing the imaging range to be visible at the time of imaging. Although illustration is omitted, the imaging surface (lens) of the imaging device 18 and the irradiation surface (light emitting surface) of the irradiation device are arranged so as to be exposed from the housing 12. For example, the imaging direction of the imaging device 18 and the irradiation direction of the irradiation device are set to a direction inclined by a predetermined angle (about 60 °) with respect to the flat back surface of the housing 12.

  Although illustration is omitted, a battery is housed in the housing 12, and a lid is provided on the back surface of the housing 12 so as to cover the stored battery.

  FIG. 2 is a block diagram showing an example of the electrical configuration of the reading apparatus 10 shown in FIG. As illustrated in FIG. 2, the reading device 10 includes a CPU 20, and an input device 16, an imaging device 18, a ROM 22, a flash memory 23, a RAM 24, a power supply control circuit 26, and a driver 28 are connected to the CPU 20. The display device 14 is connected to the driver 28.

  The CPU 20 governs overall control of the reading device 10. The ROM 22 stores a control program (including a code reading program) of the reading device 10 and necessary data. The flash memory 23 stores various information (setting information) set in the reading device 10. However, in place of the flash memory 23, other nonvolatile memory such as EEPROM or HDD may be provided. The RAM 24 is used as a buffer area and a work area for the CPU 20. The power supply control circuit 26 supplies and stops the power from the battery to each circuit component under the instruction of the CPU 20.

  The input device 16 is the above-described various keys (16a to 16f), and inputs an operation signal or operation data corresponding to the operated key to the CPU 20. The imaging device 18 shoots an image of a subject (including an article or a product with a barcode attached) within a predetermined shooting range in response to a shooting instruction from the CPU 20 and takes a two-dimensional image (shooted image). Image data (photographed image data) is generated. However, the two-dimensional image is a black and white image (grayscale image) or a color image.

  Note that the shooting range is determined by the angle of view of the imaging device 18. For example, if the imaging device 18 is brought closer to the subject, the shooting range becomes narrower, and if the imaging device 18 is moved away from the subject, the shooting range becomes wider. However, the shooting range may be changed by the zoom function.

  The imaging device 18 provides the captured image data to the CPU 20. The CPU 20 temporarily stores the captured image data in the RAM 24. Further, in the imaging device 18, the irradiation device irradiates a laser beam for instructing a shooting range at the time of shooting.

  The driver 28 is a display control circuit, and includes, for example, a GPU and a VRAM. The driver 28 generates display image data in accordance with an instruction from the CPU 20 and outputs the display image data to the display device 14. Therefore, a display image (screen) corresponding to the display image data is displayed on the display device 14. Further, the driver 28 outputs image data corresponding to the captured image stored in the RAM 24 to the display device 14 in accordance with an instruction from the CPU 20. Therefore, the captured image is displayed on the display device 14. That is, the captured image is displayed as a preview.

  In the imaging device 18, the image processing circuit performs binarization processing on the captured image data stored in the RAM 24, and generates binary image image data (binary image data). For example, in the binarization process, in a captured image, pixels less than a predetermined brightness (luminance) are converted to black pixels, and pixels having a predetermined brightness or more are converted to white pixels. The predetermined brightness is empirically determined in advance by experiments or the like. For example, when detecting (reading) a black barcode, the predetermined brightness can be set to a relatively low value. The CPU 20 extracts (detects) a barcode to be processed from the generated binary image data, and decodes the extracted barcode.

  For example, when extracting a barcode from binary image data, the CPU 20 first applies a smoothing filter to the binary image data to make the binary image blurred. Next, the CPU 20 extracts the position of island-like chunks (locations where the same color is concentrated) from the blurred binary image data. The CPU 20 determines whether or not there is a straight line from the binary image data before applying the smoothing filter at the position of the extracted island-shaped lump and its vicinity, and detects the straight line if it exists. (Edge extraction). Then, the CPU 20 extracts rectangular image data from the binary image data by extracting the detected straight line and the range (region) of the island-shaped chunk extending perpendicularly to the straight line. The rectangular image data extracted from the binary image data is temporarily listed as image data candidates corresponding to the barcode.

  Subsequently, the CPU 20 determines whether or not each extracted rectangular image data is image data indicating a barcode by performing a parity check, for example. In the parity check, the CPU 20 encodes the rectangular image data based on a straight line (bar) included in the rectangular image data, and determines whether or not the encoded code pattern matches the barcode pattern.

  The CPU 20 converts the rectangular image data determined to be image data indicating a barcode into barcode information (code information signal) indicated by at least one of numerical values and characters. That is, the barcode is decoded. However, the barcode information may further include a symbol.

  In addition, when the captured image includes a plurality of barcodes, the above-described processing is performed on each barcode.

  The CPU 20 outputs the converted barcode information (decoding result). As an example, the barcode information is displayed on the display device 14. However, the barcode information may be transmitted to a host device (not shown) of the reading device 10. Although not shown, the CPU 20 transmits barcode information to the host device via the interface. Therefore, the barcode information is used for processing in the host device. For example, when a bar code is attached to a product sold at a store, the bar code information represents a retail price, a product name, and a product type, and the host device functions as a cash register. However, the barcode information may be transmitted to the host device wirelessly.

  Further, the barcode information includes information about the number of digits of the barcode or the size of the barcode and the type information. However, the type information is information indicating a one-dimensional barcode or a two-dimensional code.

  As described above, the reader 10 having such a configuration can collectively read (decode) a plurality of barcodes included in a captured image. For example, when the decoding of the barcode is successful, information about the number of digits of the barcode or the size of the barcode and the barcode type information are stored. When a plurality of barcodes are read, the barcode data output order is set according to the number of digits of the barcode or the barcode size information and the barcode type information.

  For example, the reader 10 having such a configuration uses the same kind of article or commodity (hereinafter referred to as “article”) having a barcode attached at the same position for the operation of continuously reading the barcode for each article. May be.

  In addition, although this 1st Example demonstrates the case where a barcode is attached | subjected to articles | goods, it does not need to be limited to this. The same is true when a bar code is attached to a slip or label other than an article.

  However, in the above case, it is necessary to replace a plurality of barcodes read from the captured image on the application side that has received the plurality of barcodes, and there is a problem that processing takes time.

  Therefore, in the first embodiment, the data organization work after reading the barcode is unnecessary, and the time required for the reading process can be shortened.

  Briefly, an article with a plurality of barcodes is photographed, and a plurality of reading ranges 200 (see FIG. 5) corresponding to the position and size of each barcode are set using the photographed image. To do. However, the plurality of reading ranges 200 are set for a captured image captured by the imaging device 18. Then, a barcode reading (decoding) order is set corresponding to the plurality of reading ranges 200. In the first embodiment, after decoding all the barcodes, the barcode information decoded according to the output order set by the user is transmitted to the host device.

  However, the barcode information decoded according to the decoding order (decoding order) of the barcodes may be transmitted to the host device. In such a case, the decoding order for decoding the barcode is set by the user instead of the output order.

  Also, the output order is set in a desired order by the user so that it can be used as it is on the application side that receives a plurality of barcode information. These settings are referred to as initial settings.

  In this way, if a plurality of reading ranges 200 are set for a photographed image obtained by photographing an article with a plurality of barcodes, and the reading order of the barcodes included in each reading range 200 is set, After that, when the reading process of the same kind of article is executed, the barcode included in the set reading range 200 is read according to the set reading order, so that the application side that receives a plurality of barcode information is replaced (organized). ) Is not required.

  First, a description will be given of setting a plurality of reading ranges 200 for a captured image obtained by photographing an article with a plurality of barcodes, and setting a reading order for each reading range 200. FIG. Here, an article used to set a plurality of reading ranges 200 is referred to as a reference article, and a barcode attached to the reference article is referred to as a reference barcode RB.

  FIG. 3 is an illustrative view showing an example of a menu screen 100 displayed on the display device 14 of the reading device 10. The menu screen 100 is automatically displayed in the display range 140 of the display device 14 when the power key 16e is operated and the main power supply of the reading device 10 is turned on.

  As shown in FIG. 3, the menu screen 100 is provided with an initial setting button 102a and a reading button 102b. The initial setting button 102a is a button for instructing execution of initial setting (instruction for initial setting processing). The reading button 102b is a button for instructing execution of barcode reading (instruction for reading processing).

  When the initial setting button 102a is selected (touched), an initial setting process is started. Then, the CPU 20 controls the imaging device 18 to execute an imaging process (imaging process) on a predetermined subject (an article with a plurality of barcodes). The imaging device 18 receives a shooting instruction from the CPU 20, emits laser light, displays the shooting range so as to be visible, executes autofocus processing, and executes imaging processing when the focal length is adjusted. . Therefore, as described above, the captured image data is stored in the RAM 24 and the captured image is displayed on the display device 14. For example, a captured image including a plurality of barcodes is acquired and displayed on the display device 14. When a plurality of barcodes are imaged, an initial setting screen 110 for setting the reading range 200 of each of the plurality of barcodes using the captured image and setting the output order corresponding to the reading range 200. Is displayed on the display device 14.

  FIG. 4 is an illustrative view showing one example of a photographed image photographed by the imaging device 18. However, FIG. 4 shows a monochrome captured image as an example, but the captured image may be in color. In the first embodiment, a subject with four barcodes is photographed, but this is merely an example and should not be limited. In addition to the barcode, characters and the like are also photographed, but are omitted in FIG. However, since the barcode is not read in the initial setting process, the binarization process may not be performed.

  As shown in FIG. 4, a photographed image photographed by the imaging device 18 is displayed as the initial setting screen 110. In the first embodiment, the captured image includes four reference barcodes RB1 to RB4. A reading range 200 is set corresponding to each of the reference bar codes RB1 to RB4. That is, four reading ranges 200 are set. Hereinafter, when it is not necessary to identify each of the reference barcodes RB1 to RB4, it may be simply referred to as “reference barcode RB”.

  For example, the user designates a rectangular frame (square frame) surrounding each of the reference barcodes RB1 to RB4. As an example, the user touches (specifies) a position corresponding to the upper left vertex of the square frame (reading range 200) surrounding (including) the reference barcode RB, and then the position corresponding to the lower right vertex of the square frame. Touch. Such a designation operation is performed for each of the reference barcodes RB1 to RB4.

  However, this is merely an example and need not be limited. As described above, a binarization process is performed on the captured image, the reference barcodes RB1 to RB4 are automatically recognized from the binarized image, and a square frame (read) surrounding (including) each of the reference barcodes RB1 to RB4. The range 200) may be set automatically.

  Further, the reading range 200 may be set in position and size by designating an upper right vertex and a lower left vertex.

  FIG. 5 is an illustrative view showing a reference bar code RB and a reading range 200 set corresponding to the reference bar code RB. The reading range 200 is formed in a rectangular shape, and is set to include the entire corresponding reference bar code RB as described above. Therefore, the reading range 200 is set to be the same size as the corresponding reference barcode RB or slightly larger than the reference barcode RB. In FIG. 5, the reading range 200 is indicated by a dotted square frame, but this is an example and should not be limited. Further, for example, the reading range 200 is displayed superimposed (superimposed) on the front surface of the captured image.

  Although not shown, the reading range 200 may overlap with a part of another reading range 200. However, one reading range 200 corresponds to one reference barcode RB.

  In the example shown in FIG. 5, the reading range 200A is set corresponding to the reference barcode RB1, the reading range 200B is set corresponding to the reference barcode RB2, and the reading range 200C is set corresponding to the reference barcode RB3. Then, the reading range 200D is set corresponding to the reference barcode RB4. Hereinafter, when there is no need to individually identify the reading ranges 200 </ b> A to 200 </ b> D, they are simply referred to as “reading range 200”.

  Further, as shown in FIG. 5, the points described at the upper left vertex and the lower right vertex of the reading range 200 are points touched (specified) by the user when the reading range 200 is specified as described above. is there. In the first embodiment, the position and size of the reading range 200 are defined by the upper left vertex and the lower right vertex.

  The position and size of each reading range 200 are set corresponding to the captured image. However, in the first embodiment, the size of the display range 140 of the display device 14 and the size of the captured image are the same. For example, for a vertically long captured image, a two-dimensional coordinate system is set in which the horizontal direction is the X axis and the vertical direction is the Y axis. Further, for example, the upper left vertex of the captured image is set to the origin O (0, 0) of the two-dimensional coordinate system. Further, the horizontal direction of the captured image is the X-axis direction, and the vertical direction is the Y-axis direction. Furthermore, the right direction from the origin is the plus direction of the X axis, and the downward direction from the origin is the plus direction of the Y axis. In such a two-dimensional coordinate system, the position and size of each reading range 200 are specified. However, the X component and Y component of the coordinates are expressed by the number of pixels of the captured image.

  Therefore, in the example shown in FIG. 5, the coordinates of the upper left vertex of the reading range 200A are (50, 100), and the coordinates of the lower right vertex are (300, 250). Further, the coordinates of the upper left vertex of the reading range 200B are (350, 100), and the coordinates of the lower right vertex are (800, 250). Further, the coordinates of the upper left vertex of the reading range 200C are (150, 300), and the coordinates of the lower right vertex are (700, 550). The coordinates of the upper left vertex of the reading range 200D are (350, 550), and the coordinates of the lower right vertex are (800, 750).

  In FIG. 5, for convenience of explanation, the upper left vertex and the lower right vertex of the reading ranges 200A to 200D are illustrated, and the coordinates of each point are displayed in the vicinity of each vertex. Is not displayed on the initial setting screen 110.

  In this way, the reading ranges 200A to 200D are set for each of the four reference barcodes RB1 to RB4. For example, when the setting of the reading range 200 is completed (completed), the user operates the OK key 16b. Subsequently, the output order is set by the user corresponding to each reading range 200.

  FIG. 6 is an illustrative view showing a reading range 200 set corresponding to the reference bar code RB of the photographed image. For example, when the reading range 200 is set corresponding to a plurality of reference barcodes RB, a label (identification information) is attached to each reading range 200.

  In the initial setting screen 110 in FIG. 6, the captured image is not displayed (erased) and only the reading range 200 is displayed, but the captured image may be displayed. In the example shown in FIG. 6, label A is attached to the reading range 200A, label B is attached to the reading range 200B, label C is attached to the reading range 200C, and label D is attached to the reading range 200D. The However, labels A to D are only used in internal processing and are not actually displayed on the initial setting screen 110.

  In the initial setting screen 110 shown in FIG. 6, when the user selects the reading ranges 200A to 200D in a desired order, the output order is set for the reading ranges 200A to 200D in the order selected by the user.

  FIG. 7 is an illustrative view showing one example of a reading range table in which the position and range of the reading range 200 and the output order corresponding to the reading range 200 are described. When the reading range 200 and the output order corresponding to the reading range 200 are set, a reading range table as shown in FIG. 7 is generated. In the reading range table shown in FIG. 7, the coordinates X1, the coordinates Y1, the coordinates X2, the coordinates Y2, and the output order are described corresponding to the labels.

  The label is a label (identification information) attached to each reading range 200, and alphabets (A to D) are described as described above. However, the label may be a number or a combination of a number and an alphabet, and the reading range table may be a symbol that cannot be deciphered by humans because it is only generated and used by internal processing.

  The coordinates X1, coordinates Y1, coordinates X2, and coordinates Y2 are information for defining the position and size of the reading range 200 set in the reference barcode RB. Specifically, the coordinate X1 and the coordinate Y1 are the two-dimensional coordinates of the upper left vertex of the reading range 200, and the coordinate X2 and the coordinate Y2 are the two-dimensional coordinates of the lower right vertex of the reading range 200.

  The output order is an output order set for the reading range 200, and a number corresponding to the output order is described. Accordingly, in the example of the reading range table shown in FIG. 7, the barcodes included in each reading range 200 are read (decoded) in the order of the reading range 200B, the reading range 200D, the reading range 200A, and the reading range 200C. Bar code information is output (transmitted) to the host device. However, the order of executing the decoding process may be arbitrary.

  Thus, when the reading range 200 and the output order corresponding to the reading range 200 are set and the reading range table as shown in FIG. 7 is generated, the initial setting is completed. When the initial setting is completed, the menu screen 100 shown in FIG.

  When the reading device 10 is activated for the first time, the initial setting may be automatically started. When reading bar codes of different types of articles, the above initial setting is executed for different types of articles, and a new reading range table is generated. However, a reading range table may be generated for each article of a different type, and the reading range table may be properly used as necessary. In this embodiment, “a different kind of article” means that any one of the number, position, and range of barcodes attached is different. Therefore, “the same kind of article (the same kind of article)” means that the number, position, and range of barcodes to be attached are the same.

  After the initial setting, when the reading button 102b is selected on the menu screen 100 or the scan key 16a is operated, the CPU 20 refers to the reading range table generated by the initial setting and reads the barcode. Execute the process. When the barcode reading process is executed, the CPU 20 controls the imaging device 18 to execute the imaging process. However, in the first embodiment, the subject imaged in the barcode reading process is the same type of article as the article used for the initial setting. For this reason, the number of barcodes attached to the article to be imaged in the barcode reading process is the same as the number of reference barcodes RB attached to the reference article used for the initial setting. Further, the positions and sizes of the plurality of barcodes attached to the article to be imaged in the code reading process are the same as the positions and sizes of the plurality of reference barcodes RB.

  Therefore, in the barcode reading process, as described above, the imaging process is executed, and a captured image including a plurality of barcodes is acquired. A binarization process is performed on the captured image data corresponding to the captured image to generate a binary image. When the binary image is generated, the CPU 20 extracts an image for each reading range 200 from the binary image with reference to the reading range table generated by the initial setting. However, similarly to the reference image at the time of initial setting, a two-dimensional coordinate system is set for the binary image, and an image in the reading range 200 is extracted for each reading range 200 from the binary image. Next, the CPU 20 extracts (detects) a barcode from the binary image from the extracted image (extracted image), and decodes the extracted barcode. However, the extracted image is managed in association with the reading range 200 (label of the reading range 200), and the decoded barcode information (decoding result) is output according to the output order entered in the reading range table.

  FIG. 8 is an illustrative view showing one example of a memory map 70 of the RAM 24 shown in FIG. As shown in FIG. 8, the RAM 24 includes a program storage area 72 and a data storage area 74. The program storage area 72 stores a control program including a barcode (code) reading program. The control program includes a main processing program 72a, an image display program 72b, an operation detection program 72c, an imaging processing program 72d, and a reading range. A setting program 72e, an output order setting program 72f, a code detection program 72g, a decoding program 72h, and the like are included.

  The main processing program 72 a is a program for processing the main routine of the reading device 10. The image display program 72b is a program for generating and outputting display image data corresponding to various display images displayed on the display device 14. The image display program 72b is also a program for outputting captured image data corresponding to a captured image to the display device 14.

  The operation detection program 72c is a program for detecting operation data input from the input device 16 (keys 16a to 16f) and storing the detected operation data in the operation data buffer 74a. The operation detection program 72c is also a program for detecting coordinate data input from the touch panel and storing the detected coordinate data in the operation data buffer 74a.

  The imaging processing program 72d is a program for controlling the imaging device 18 and imaging a subject when an initial setting process or a reading process is executed. The imaging processing program 72d is also a program for generating a binary image from the captured image.

  The reading range setting program 72e is a program that sets the positions and sizes of the plurality of reading ranges 200 in accordance with a user instruction in a captured image captured according to the imaging processing program 72d.

  The output order setting program 72f is a program for setting the output order of the plurality of reading ranges 200 set by the reading range setting program 72e in accordance with a user instruction.

  In the initial setting, the reading range setting program 72e and the output order setting program 72f are executed to generate the reading range table shown in FIG. 7, and data corresponding to the generated reading range table (reading range table data 74e). ) Is stored (overwritten) in the data storage area 74.

  The code detection program 72g is a program for extracting an image included in the reading range 200 set by the reading range setting program 72e from the binary image and detecting a barcode from the extracted image.

  The decoding program 72h reads the barcode detected for each reading range 200, decodes it into barcode information, and outputs the decoded barcode information to the host device according to the output order set according to the output order setting program 72f. It is a program.

  Although not shown, the program storage area 72 also stores other programs necessary for controlling the reading device 10.

  The data storage area 74 stores operation data buffer 74a, image generation data 74b, captured image data 74c, binary image data 74d, and reading range table data 74e.

  The operation data buffer 74a is a buffer for storing detected operation data in time series. The operation data stored in the operation data buffer 74a is deleted after being used for the processing of the CPU 20. However, as described above, coordinate data input from the touch panel may be stored.

  The image generation data 74b is data including polygon data and texture data for generating display image data corresponding to the display image displayed on the display device 14. The photographed image data 74c is image data regarding a photographed image photographed by the imaging device 18. The binary image data 74d is image data regarding a binary image generated by performing binarization processing on a captured image. The reading range table data 74e is data regarding the reading range table as shown in FIG.

  Although illustration is omitted, the data storage area 74 stores other data necessary for controlling the reading device 10 and is provided with a flag and a counter (timer) necessary for controlling the reading device 10.

  FIG. 9 is a flowchart showing an example of main processing of the CPU 20 shown in FIG. This main process is started when the reading apparatus 10 is activated. When starting the main process, the CPU 20 determines whether or not setting information exists in step S1. In the first embodiment, the setting information means a reading range table generated in the initial setting. That is, in step S <b> 1, the CPU 20 determines whether reading information (reading range table data 74 e) is stored in the flash memory 23.

  If “NO” in the step S1, that is, if the setting information does not exist, the process proceeds to a step S7 described later. On the other hand, if “YES” in the step S1, that is, if the setting information exists, the menu screen 100 is displayed on the display device 14 in a step S3, and whether or not the initial setting is selected in the step S5. to decide. Here, the CPU 20 determines whether or not the initial setting button 102a has been selected.

  If “YES” in the step S5, that is, if the initial setting is selected, an imaging process is executed in a step S7. Here, the CPU 20 gives a shooting instruction to the imaging device 18. In response to this, the imaging device 18 executes an imaging process and acquires a captured image. Captured image data 74d corresponding to the acquired captured image is stored in the RAM 24.

  In the next step S9, the captured image acquired in step S5 is displayed on the display device 14, and in step S11, the reading range 200 is set in accordance with a user operation or automatically. Here, the coordinates (X1, Y1) of the upper left vertex and the coordinates (X2, Y2) of the lower right vertex of each reading range 200 set in accordance with a user operation or automatically are described in the reading range table. . When the reading range 200 is set, a label is attached to the reading range 200, and the label attached to the reading range 200 is described in the reading range table corresponding to the coordinates defining the reading range 200.

  Subsequently, in step S13, it is determined whether or not the setting of the reading range 200 has been completed. Here, the CPU 20 determines whether or not the OK key 16b has been operated. If “NO” in the step S13, that is, if the setting of the reading range 200 is not ended, the process returns to the step S11. On the other hand, if “YES” in the step S3, that is, if the setting of the reading range 200 is ended, the output order of the reading range 200 is set in step S15 according to the user's operation. Here, the output order set in accordance with the user's operation is described in the reading range table corresponding to each barcode label.

  In step S17, it is determined whether the setting of the output order has been completed. Here, the CPU 20 determines whether or not the output order of each reading range 200 is described corresponding to the label of each reference barcode RB in the reading range table. If “NO” in the step S17, that is, if the setting of the output order is not ended, the process returns to the step S15. On the other hand, if “YES” in the step S17, that is, if the setting of the output order is finished, a reading range table is generated, the setting information is stored in a step S19, and the process returns to the step S3. That is, in step S19, the CPU 20 stores the reading range table data 74e in the flash memory 23.

  If “NO” in the step S3, that is, if the initial setting is not selected, it is determined whether or not reading is selected in a step S21. Here, the CPU 20 determines whether the reading button 102b has been selected or whether the scan key 16a has been operated.

  If “NO” in the step S21, that is, if reading is not selected, the process returns to the step S3. On the other hand, if “YES” in the step S21, that is, if reading is selected, a barcode reading process is executed in a step S23, and the process returns to the step S3.

  FIG. 10 is a flowchart showing an example of the reading process in step S23 shown in FIG. As shown in FIG. 10, when starting the reading process, the CPU 20 reads the setting information in step S31. That is, the CPU 20 reads the setting information (reading range table data 74e) from the flash memory 23 and stores it in the RAM 24. In the next step S33, an imaging process is executed. Here, the CPU 20 gives a shooting instruction to the imaging device 18. In response to this, the imaging device 18 executes the imaging process as described above.

  In subsequent step S35, the captured image is converted into a binary image. Here, the CPU 20 gives an instruction to cause the imaging device 18 to execute binarization processing. The imaging device 18 generates a binary image from the captured image. The binary image data 74d corresponding to the generated binary image is stored in the RAM 24.

  In subsequent step S37, an image of the reading range 200 is extracted, and in step S39, decoding processing is performed on the extracted image. However, the decoding process in step S39 is performed for each reading range 200.

  Subsequently, in step S41, it is determined whether or not there is a next reading range 200. Here, it is determined whether there is an extracted image (barcode) of the reading range 200 that has not been subjected to decoding processing.

  If “YES” in the step S41, that is, if there is a next reading range 200, the process returns to the step S39. On the other hand, if “NO” in the step S41, that is, if the decoding processing of the extracted images (barcodes) of all the reading ranges 200 is completed, the barcode information is displayed according to the output order described in the reading range table. Output to the host device and return to the main process.

  According to the first embodiment, the reading range 200 is set in advance corresponding to each of the plurality of reference bar codes RB attached to the reference article, and the output order is set in advance in each reading range 200. Thus, the barcode detected from the extracted image included in the set reading range 200 when the barcode is decoded (read) from the photographed image of the same kind of article with a plurality of barcodes attached as in the reference article Since the decoded barcode information is output to the host device in accordance with the output order, it is not necessary to organize the data after the barcode is read, and the time required for the reading process can be shortened. For example, in the case where the barcode reading process is repeatedly executed for the same type of article having a plurality of barcodes as in the case of the reference article, the time for executing the barcode reading process for all the articles is set. Can be shortened very much.

In the first embodiment, the upper left vertex of the captured image is set as the origin O, and the coordinates of the upper left vertex and the lower right vertex of each reading range 200 are determined. However, the present invention is not limited to this. . For example, since the reading device 10 is hand-held and it is difficult to acquire the same captured image every time, any one vertex of any one reading range 200 is set as the origin, and each reading range The coordinates of the upper left vertex and the lower right vertex may be determined. However, in such a case, it is necessary to detect the position of the barcode in the photographed image, identify the barcode corresponding to the reading range 200 in which the origin is set, and match the position of each reading range 200 with each barcode. is there.
[Second Embodiment]
The reading device 10 according to the second embodiment is configured so that each of a plurality of barcodes (included in a captured image) attached to a subject (article) is located within a set reading range 200. Since it is the same as the reading device 10 of the first embodiment except that information is output, the overlapping description is omitted or simplified. Further, parts common to the first embodiment described above will be described using the same reference numerals.

  In other words, in the first embodiment, it is assumed that the position and range of the barcode attached to the article to be read are the same as the position and range of the reference barcode RB attached to the reference article. However, the position and range of the barcode attached to the article for which the reading process is executed may be different from the position and range of the reference barcode RB. Therefore, in the second embodiment, such a case is also taken into consideration.

  FIG. 11A is an illustrative view showing a case where the barcode included in the photographed image is located within the set reading range 200, and FIG. 11B shows the barcode included in the photographed image. FIG. 10 is an illustrative view showing a case where the reading position is not within a set reading range 200.

  As shown in FIG. 11A, when each barcode in the photographed image is located within the set reading range 200, the reading process is executed, as described in the first embodiment. As described above, the barcode is detected from the extracted image corresponding to each reading range 200, and the detected barcode is decoded. Then, the barcode information decoded according to the set output order of the reading range 200 is output.

  On the other hand, as shown in FIG. 11B, when each of the barcodes in the photographed image is not located within the set reading range 200, a part of the barcode protrudes from the reading range 200, Since the barcode is present at a position not included in the reading range 200, a part or all of the barcode is not included in the extracted image corresponding to the reading range 200. Therefore, when the barcode is not located within the set reading range 200, the barcode decoding fails (not succeeded) even if the decoding process is executed.

  However, when the decoding of the barcode fails, the imaging process is repeatedly executed until a predetermined time (reading time) set in advance has elapsed. The reading apparatus 10 of the second embodiment is provided with a timer for counting elapsed time (reading time) from the time when the reading process is started. Although not shown, this timer is provided inside the reading apparatus 10 (CPU 20 or RAM 24). In the second embodiment, the reading time is designated (set) by the user in the initial setting. This reading time is included in the setting information.

  The reading time is set in this way even when a plurality of barcodes (included in the captured image) attached to the subject are present at positions corresponding to the plurality of set reading ranges 200. This is because the barcode position in the captured image may deviate from the set reading range 200 depending on the timing at which the imaging process is performed. For this reason, the imaging process is repeatedly executed until the reading time elapses so that the position of the barcode in the photographed image matches the position of the set reading range 200.

  If the reading time elapses without successfully decoding the barcode, an error is notified. Although illustration is omitted, for example, an error message indicating that the barcode reading process has failed and that it should be confirmed whether the barcode of the correct article is being read is displayed on the display device 14. Further, instead of displaying the error message, or together with the display of the error message, a sound (melody) or sound for informing the error may be output.

  Although illustration is omitted, in the second embodiment, in the main process, the CPU 20 not only generates the reading range table but also sets the reading time. Then, the reading range table and the reading time are stored in the flash memory 23 as setting information.

  FIG. 12 is a flowchart showing an example of the reading process in the second embodiment. In the following, the reading process shown in FIG. 12 will be described, but the description of the same process as that described in the first embodiment will be omitted or simply described.

  As shown in FIG. 12, when the CPU 20 performs the decoding process in step S39, the CPU 20 determines in step S71 whether the barcode has been successfully decoded. Although illustration is omitted, the timer count starts when the first decoding process is started.

  If “YES” in the step S71, that is, if the decoding of the barcode is successful, the process proceeds to the step S41 described in the first embodiment. On the other hand, if “NO” in the step S71, that is, if the decoding of the barcode has failed, it is determined whether or not the reading time has passed in a step S73. Here, it is determined whether or not the count value of the timer has exceeded the reading time included in the setting information.

  If “NO” in the step S73, that is, if the reading time has not elapsed, the process returns to the step S33 and starts again from the imaging process. On the other hand, if “YES” in the step S73, that is, if the reading time has elapsed, an error is notified in a step S75, and the process returns to the main process.

According to the second embodiment, barcode information is not output even if another type of article with a barcode attached at a position different from the subject (article) used for the initial setting is erroneously read. . In addition, when the decoding of the barcode is unsuccessful, since the imaging process is performed again, the barcode may be successfully decoded by changing the position of the correct article. Since the bar code information is output according to the output order, it is the same as in the first embodiment. Therefore, in the second embodiment, it is not necessary to perform data organization work after the reading process. Can be reduced.
[Third embodiment]
In the third embodiment, at least one of the position, size, and orientation of the barcode in the captured image is changed, and the barcode is read from the changed captured image. Therefore, the duplicated explanation is omitted or simplified. Further, parts common to the first embodiment described above will be described using the same reference numerals.

  For example, since the hand-held reading device 10 is used, the position when the article (bar code) to be read is imaged is different from the case where the reference article is imaged. Or the orientation of the reading device 10 (imaging device 18) with respect to the article may be different. Therefore, in the third embodiment, as described above, by changing at least one of the position, size, and orientation of the barcode in the captured image, the difference in position, size, and orientation that occurs during imaging is absorbed. It is like that.

  FIGS. 13A to 13D are illustrative views showing an example of changing the position or / and size of the barcode in the third embodiment.

  As shown in FIG. 13A, when the imaging process is executed, the position of the reading device 10 (imaging device 18) with respect to the subject is shifted or the subject and the reading device 10 ( Due to the difference in distance from the imaging device 18), the position of the barcode in the captured image (binary image) may not match the position of the reading range 200 in the reading process. For example, in the example shown in FIG. 13A, the position of the barcode in the binary image is shifted downward as a whole with respect to the position of the reading range 200, and the reading range 200 that does not include the barcode is displayed. Exists. If the barcode reading process is performed in this state, decoding fails.

  In such a case, in the third embodiment, the position or / and size of the barcode in the binary image is changed so that the position of the barcode in the binary image matches the position of the reading range 200. . For example, a part of the binary image is cut out, and the cut out image is moved so as to match the position of the reading range 200. Hereinafter, an example of a method for changing the position or / and the size of the barcode in the binary image will be described.

  First, as shown in FIG. 13B, in the initial setting process, the reference range RA is set based on the reference barcode RB, and the first reference point RP1 and the second reference point RP2 are extracted (set) from the reference range RA. ) However, in the initial setting process of the third embodiment, the reference image is binarized and the reference bar code RB is extracted from the binary image data.

  The reference range RA is set to a range included in the minimum rectangular shape including all the reference barcodes RB extracted from the binary image data. For example, the left side of the reference range RA is formed by a straight line passing through the position of the left end of the leftmost reference bar code RB1 among the plurality of reference bar codes RB, and the right side of the reference range RA is a plurality of reference bar codes It is formed by a straight line passing through the position of the right end of the reference bar code RB4 that is the rightmost of the codes RB. Further, the upper side of the reference range RA is formed by a straight line passing through the position of the upper end of the uppermost reference bar code RB2 among the plurality of reference bar codes RB, and the lower side of the reference range RA is a plurality of reference bar codes. It is formed by a straight line passing through the position of the lower end portion of the lowermost reference bar code RB4 in the code RB.

  The first reference point RP1 is set at a position corresponding to the upper left vertex of the reference range RA, and the second reference point RP2 is set at a position corresponding to the lower right vertex of the reference range RA.

  When the initial setting process is completed, the reference point data corresponding to the first reference point RP1 and the second reference point RP2 is stored in the flash memory 23. Although not shown, the positions of the first reference point RP1 and the second reference point RP2 indicated by the reference point data are expressed by coordinates of a two-dimensional coordinate system set to specify the reading range 200.

  Next, as shown in FIG. 13C, in the reading process, a cutout area CA is set based on the barcode from the captured image (binary image), and an image in the cutout area CA is cut out. Further, the first extraction point P1 and the second extraction point P2 are extracted from the image (cutout image) within the cutout range CA. However, the setting of the cutout range CA means that the read range for the cutout range CA in the binary image data is set.

  Specifically, the cutout range CA is set to a range included in the minimum rectangular shape including all barcodes extracted from the binary image data. Note that the specific method for setting the cutout range CA is the same as that for the reference range RA, and thus the description thereof is omitted.

  The first extraction point P1 is set at a position corresponding to the upper left vertex of the cutout range CA, and the second extraction point P2 is set at a position corresponding to the lower right vertex of the cutout range CA. Although illustration is omitted, the positions of the first extraction point P1 and the second extraction point P2 are expressed by coordinates of a two-dimensional coordinate system set to specify the reading range 200.

  When the first extraction point P1 and the second extraction point P2 are set, the cutout range CA is moved so that the first extraction point P1 overlaps the first reference point RP1. Further, in the state where the first extraction point P1 overlaps the first reference point RP1, the cutout range CA is expanded or reduced so that the second extraction point P2 overlaps the second reference point RP2. That is, the position or / and size of the barcode is changed. However, the movement, enlargement, or reduction of the cutout range CA means that the read range of the binary image data is changed.

  In addition, as compared with the case where the reference article is imaged, the size of the reference range RA and the size of the cutout range CA are the same if the distance when the article to be read is imaged is the same. That is, the size of the reference barcode RB and the size of the barcode to be processed are the same. In this case, if the cutout range CA is moved so that the first extraction point P1 overlaps the first reference point RP1, the position of the barcode in the binary image matches the position of the reading range 200. In this case, the enlargement or reduction of the cutout range CA may be omitted.

  As shown in FIG. 13D, when the cutout image is moved and the position or / and size of the barcode is changed, the position of the barcode matches the position of the reading range 200. In the third embodiment, the extracted image is extracted from the cut-out image in the barcode reading process.

  FIGS. 14A to 14D are illustrative views showing an example of changing the direction of the barcode in the third embodiment.

  As shown in FIG. 14A, when the imaging process is executed, the orientation of the reading device 10 (imaging device 18) with respect to the subject is different from that in the initial setting. In some cases, the orientation of the barcode in the captured image (binary image) does not match the orientation of the reading range 200. For example, in the example shown in FIG. 14A, the barcode orientation in the binary image is the orientation rotated 90 degrees counterclockwise (counterclockwise) with respect to the orientation of the reading range 200.

  In such a case, in the third embodiment, the orientation of the binary image is changed so that the orientation of the barcode in the binary image matches the orientation of the reading range 200. Hereinafter, an example of a method for rotating a binary image will be described.

  First, as shown in FIG. 14B, in the initial setting process, the direction RD of the reference barcode RB is extracted (set). For example, a direction perpendicular to the straight line of the automatically detected reference bar code RB (the direction in which the island-shaped chunk extends) is set as the direction RD of the reference bar code RB. As described above, since the reading range 200 is set to correspond to the reference barcode RB, the orientation RD of the reference barcode RB is the same as the orientation of the reading range 200. For example, in the example shown in FIG. 14B, the direction RD of the reference barcode RB (reading range 200) is the horizontal direction.

  Next, as shown in FIG. 14C, the barcode orientation BD in the captured image (binary image) is extracted in the reading process. For example, in the example shown in FIG. 14C, the barcode direction BD is the vertical direction.

  When the barcode orientation is extracted, the binary image is rotated so that the barcode orientation BD in the binary image matches the orientation RD of the reference barcode RB. For example, in the example shown in FIG. 14C, the binary image is rotated 90 degrees clockwise (clockwise).

  As shown in FIG. 14D, when the binary image is rotated, the barcode orientation BD in the binary image matches the orientation RD of the reference barcode RB (reading range 200). In this state, when the barcode position matches the position of the reading range 200, barcode reading processing is performed. However, the barcode position may not match the position of the reading range 200 just by matching the barcode direction BD and the direction RD of the reference barcode RB (reading range 200). In this case, as described above, the barcode reading process is performed after changing the position or / and size of the barcode (see FIGS. 13A to 13D).

  In the third embodiment, at least one of the position, size, and orientation of the barcode in the binary image is changed. However, at least one of the position, size, and orientation of the reading range 200 is changed. You may do it.

  In the third embodiment, after the orientation of the binary image is changed, the cutout area CA is set and the cutout image is cut out. However, after the cutout image is cut out, the direction of the cutout image is set. May be changed.

  Furthermore, even if the position of the bar code matches the position of the reading range 200, the direction BD of the bar code and the direction RD of the reference bar code RB (reading range 200) are opposite (clockwise). (Clockwise direction) or counterclockwise (counterclockwise direction). In such a case, barcode decoding may fail. In this case, if the position of the barcode matches the position of the reading range 200 and the barcode decoding fails, the direction of the binary image is changed by 180 degrees, and then again. Barcode decoding is performed.

  FIG. 15 is a flowchart showing an example of the reading process in the third embodiment. Note that description of the same processing as that described in the reading processing of the first embodiment (FIG. 10) will be omitted or briefly described.

  As shown in FIG. 15, when starting the reading process, the CPU 20 converts the captured image into a binary image in step S35, and extracts a plurality of barcodes from the binary image in step S91. Here, the direction and position of each barcode are also extracted. In a succeeding step S93, it is determined whether or not the barcode direction BD matches the direction RD of the reference barcode RB.

  If “YES” in the step S93, that is, if the barcode direction BD matches the direction RD of the reference barcode RB, the process proceeds to a step S97. On the other hand, if “NO” in the step S93, that is, if the barcode direction BD does not match the direction RD of the reference barcode RB, in step S95, the barcode direction BD in the binary image and the reference The binary image is rotated so that the direction RD of the barcode RB matches, and the process proceeds to step S97.

  In step S97, it is determined whether or not the position of the barcode in the binary image matches the position of the reference barcode RB. If “YES” in the step S97, that is, if the position of the barcode in the binary image matches the position of the reference barcode RB, the process proceeds to a step S37. On the other hand, if “NO” in the step S97, that is, if the position of the barcode in the binary image and the position of the reference barcode RB do not coincide with each other, the first reference point RP1 and the second reference point in the step S99. RP2 is read out, a cutout area CA is set in step S101, and an image in the cutout area CA is cut out.

  Subsequently, in step S103, the first extraction point P1 and the second extraction point P2 are extracted from the cutout range CA. In step S105, the cutout image is moved, and the process proceeds to step S37. In step S105, the cutout range CA is moved so that the first extraction point P1 overlaps the first reference point RP1. Further, in the state where the first extraction point P1 overlaps the first reference point RP1, the cutout range CA is expanded or reduced so that the second extraction point P2 overlaps the second reference point RP2.

  Note that the content of the processing after step S37 is the same as that of the first embodiment, and thus the description thereof is omitted.

  According to the third embodiment, since the barcode is read from the captured image in which the position, size or / and orientation of the barcode in the captured image is changed, the reading device 10 (imaging Even if the distance between the apparatus 18) and the subject or the position of the subject in the photographed image shifts, the barcode can be successfully decoded.

  The aspect shown in the third embodiment can be employed in combination with the second embodiment. In this case, an image in the reading range 200 is extracted from the binary image whose position, size, and / or orientation has been changed, and decoding processing is performed on the extracted image.

  As described above, a two-dimensional code can be used as a code instead of the one-dimensional barcode. The two-dimensional code can be extracted from the binary image data as an island-like lump as in the case of the one-dimensional barcode. For this reason, the position and size of the two-dimensional code are detected based on the range of the extracted island-shaped chunks. As for the direction of the two-dimensional code, when a stack type two-dimensional code is used, the direction perpendicular to the straight line included in the two-dimensional code (island-like chunks extend) is the same as the case of the one-dimensional barcode. Direction) can be extracted as the direction of the two-dimensional code. In addition, when using a matrix type two-dimensional code having a generally outer shape, the direction of an L-shaped line surrounding the two-dimensional code or the arrangement of a finder pattern (cutout symbol) is extracted. It can be extracted as the direction of the code.

  As described above, the present invention has been described based on specific embodiments, but the present invention is not limited to the above-described embodiments. Each of the specific examples given above is merely an example, and can be appropriately changed according to the necessity of product specifications and the like.

DESCRIPTION OF SYMBOLS 10 ... Code reader 14 ... Display device 16 ... Input device 18 ... Imaging device 20 ... CPU
22… ROM
24 ... RAM
26 ... Driver 200 ... Reading range

Claims (8)

A code reader for reading a plurality of codes at once,
A captured image acquisition unit that captures an image including the plurality of codes;
A storage unit for storing a plurality of reading ranges set for a captured image captured by the captured image acquisition unit and code reading information including a reading order of each of the plurality of reading ranges;
Of the captured images captured by the captured image acquisition unit, each of the images included in the plurality of reading ranges is extracted in an order according to the reading order; and in the order extracted by the image extracting unit A code reading device including a decoding unit that decodes a code included in each image.   The code reading device according to claim 1, wherein the decoding unit decodes the code when the code included in the image extracted by the extraction unit is located within the reading range.   A changing unit that changes at least one of the position and orientation of the captured image and the plurality of reading ranges so as to match the position and orientation of the captured image captured by the captured image acquisition unit and the plurality of reading ranges. The code reader according to claim 1, further comprising:   The code reading device according to claim 3, wherein the changing unit moves the positions of the plurality of reading ranges onto an image including the code in the photographed image.   The code reading device according to claim 3, wherein the changing unit changes the size of a plurality of codes included in the captured image. A reading range setting unit for setting a plurality of reading ranges corresponding to the plurality of codes;
An order setting unit for setting the reading order of each of the plurality of reading ranges set by the reading range setting unit; and a reading position and the order setting for each of the plurality of reading ranges set by the reading range setting unit The code reading device according to claim 1, further comprising a code reading information generation unit configured to generate the code reading information including the reading order of each of the plurality of reading ranges set by the unit. A control program executed by a code reading device that reads a plurality of codes at once,
In the processor of the code reader,
An image acquisition step of acquiring a captured image obtained by capturing an image including the plurality of codes;
A storage step of storing code reading information including a plurality of reading ranges set for the captured image acquired in the image acquisition step and a reading order of each of the plurality of reading ranges;
An image extraction step of extracting each of the images included in the plurality of reading ranges from the captured images acquired in the image acquisition step in an order according to the reading order, and an image extracted in the order extracted in the image extraction step. A control program for executing a decoding step of decoding an included code. A method of controlling a code reading device that reads a plurality of codes at once,
(A) acquiring a captured image obtained by capturing an image including the plurality of codes;
(B) storing code reading information including a plurality of reading ranges set for the captured image acquired in step (a) and the reading order of each of the plurality of reading ranges;
(C) extracting each of the images included in the plurality of reading ranges from the captured images acquired in the step (a) in an order according to the reading order; and (d) extracting in the step (c). A control method including a step of decoding a code included in each image in the order that has been performed.

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