JP2005174128A - Code reader - Google Patents

Abstract

Provided is a code reading device capable of reading a code composed of black and white and capable of reading a code having a specific color which cannot be read by a conventional code reading device. Luminance extraction means for extracting a luminance signal from the color image signal output from the image pickup device and writing it into the first frame memory as grayscale data; and R, G, B from both the color image signal and the luminance signal Color extraction means for extracting a color signal and writing it in the second frame memory for each of the R, G, B planes as color data of the three primary colors, and the gray scale data, the R plane of the R plane according to the code to be read Recognizing the code using any one of color data, color data of the G plane, and color data of the B plane; If you can not recognize the data, and a recognizing code recognition means the code switch to other data.
[Selection] Figure 1

Description

  In the present invention, a one-dimensional or two-dimensional code represented by a mark formed by a difference in reflectance, specular reflection, or diffuse reflection light is printed on a seal-like medium or directly formed on an object surface. The present invention relates to a code reading device that reads a code optically in a non-contact manner, and particularly has a function of reading a code by processing a color image obtained from a color image pickup device for both a black and white code and a color code. It is related with the code reader which has.

  In recent years, in order to recognize management information of products and parts in a short time, one-dimensional or two-dimensional codes in which product and part numbers, product names, prices, and other information are symbolized by black and white stripes are widely used. ing. A code having encoded information such as a one-dimensional code or a two-dimensional code represented by a symbol formed by a difference between these different reflectances, regular reflection, or diffuse reflection light (also referred to as “label” or “mark”) For example, in a one-dimensional code, a series of numbers and characters are represented by a combination of line width ratios, and various information such as product and part numbers are replaced with the numbers and characters. Such a code reader that optically reads a one-dimensional code composed of a one-dimensional bar or a secondary code composed of a two-dimensional cell is a hand-held type that an operator uses while holding the device, There is a stationary type fixed at a predetermined position on the road.

  A light-emitting diode is mainly used as a hand-held type light source, and a laser beam is mainly used as a stationary light source. Hand-held code readers are frequently used at supermarkets and department stores as a point-of-sale (POS) system, and are also used in the manufacturing and distribution stages.

  On the other hand, stationary code readers are used in distribution distribution centers and the like. For example, in a distribution center, an article with a random destination and type is conveyed by a conveying means such as a belt conveyor, and information on a label attached to the surface of the conveyed article is imaged by an imaging means. A code is read by processing an image, and various articles are automatically sorted by a sorting device based on the information.

  By the way, in recent years, illumination units and codes for reading marks (mainly two-dimensional codes) directly marked on the surface of objects such as semiconductor wafers and engine blocks, such as metals, ceramics, and polymer compounds. A reader has been developed and implemented. A mark to be directly marked is written on the surface of an object directly by a laser beam and used for the purpose of product management or the like. The mark directly formed on the object surface in this manner has excellent durability and can record a large amount of information in a small area, and can be used in various fields. However, the mark written by the laser beam is a general code because the reflected light from the object changes or totally reflects depending on the depth and shape of the part removed by the laser beam. It is difficult to read with a reading device. Therefore, for example, by devising the angle of the illumination light, such as irradiating illumination light composed of two or more light bundles that form different angles, an image formed by the reflected light from the mark is accurately formed, Marks formed on the object surface can be read (see, for example, Patent Document 1).

  The above-described code reader that reads a code printed on a seal-like medium (mainly paper) or directly formed on the surface of an object is generally an imaging device for black and white images having a high resolution. And a method of recognizing (decoding) a code from a black and white image.

On the other hand, there has also been proposed a code reading apparatus that includes a color image capturing unit and processes a color image to read a code. As a specific example, a color image pickup device having a primary color array is provided, and luminance data (Y) is extracted from color image data (R, G, B data) obtained from the image pickup device, for example, using an arithmetic expression Y = R + 2G + B. A code reading device that generates gray scale data and recognizes a code using the gray scale data is known (see, for example, Patent Document 2).
JP 2000-298698 A JP 2000-322508 A

  As described above, a code reading apparatus that reads a code printed on a seal-like medium or directly formed on the surface of an object generally includes a black and white image pickup device having high resolution, and data of a black and white image. The method of recognizing the code from is adopted. On the other hand, as a code reading apparatus including a color image imaging device, color image data is generated by processing color image data as in the apparatus described in Patent Document 2, and the code is generated using the gray scale data. The method to recognize is adopted.

  By the way, as a code having a color, (2) a code using a single color, in addition to (1) a code directly formed on the object surface as described above (a code in which a color of metal or the like appears), 3) There is a color code using color as an information element.

  In a conventional code reading apparatus that reads a code from black and white image data, it is effective when a black and white code is targeted, but cannot be read in the case of a code having the above color, and the range of use There are drawbacks such as being limited. In order to correspond to a color image, for example, a method of using a signal of one of R, G, and B color components obtained from a color image pickup element of a primary color array as code decoding data is adopted. However, even if a high-resolution imaging device is used, the sensitivity is reduced to 1/3, and there is a problem that high-accuracy code recognition cannot be realized. Although a method of integrally configuring a code reading device such as a barcode reader and an image processing device is also conceivable, there is a problem that the device becomes large and expensive.

  In addition, a code reading device that recognizes a code only from grayscale data, such as the device described in Patent Document 2, can read a code having a large luminance difference, but a code having a small luminance difference or a specific code. There is a problem that a code directly formed on the surface of an object having a color (a code having a small saturation difference) cannot be read with high accuracy. Further, a conventional code reading apparatus that processes a color image and reads a code uses an image pickup unit that includes an image pickup element having a primary color array, and can read various codes using an image pickup unit that has a complementary color array. A possible code reader has not been realized.

  The present invention has been made under the circumstances described above, and an object of the present invention is to process a color image obtained from a commonly used color image pickup device and read a code composed of black and white. Another object of the present invention is to provide a code reader capable of reading a code having a specific color that cannot be read by a conventional code reader.

  The present invention relates to a code reading apparatus that reads a black and white code and a code having a color optically in a non-contact manner. The object of the present invention is to provide a color image pickup device having a complementary color array. Image pick-up means for picking up an image, brightness extraction means for extracting a luminance signal from a color image signal of a complementary color component output from the color image pick-up element, and writing it in a first frame memory as gray scale data, and the color image R, G, and B color signals are extracted from both the complementary color component color image signal output from the image sensor and the luminance signal extracted by the luminance extraction means, and R, G, and B planes are obtained as color data of the three primary colors. A color extracting means for writing to the second frame memory every time, and the grayscale data and the R plane according to the code to be read. The code is recognized using any one of the data, the color data of the G plane, and the color data of the B plane, and if the data cannot be recognized, the code is switched to another data. This is achieved by including a code recognition means for recognizing.

  Furthermore, the color image pickup device of the complementary color array is an image pickup device made of Cy (cyan), Ye (yellow), G (green), and Mg (magenta), and the color filter of the color image pickup device of the complementary color array The luminance extraction means uses the complementary color components (Cy, Ye, G, Mg) from the signal of the complementary color components (Cy, Ye, G, Mg) as the correction coefficients set in advance according to the sensitivity characteristics and the visibility, and the equation Y = Cy + Ye + G + Mg = The luminance signal (Y) is generated by C1 · 2 · R + C2 · 3 · G + C3 · 2 · B, and the color extracting means sets Cy = B + G, Ye = R + G, and Mg = R + B as the complementary color components (Cy, Ye). , G, Mg) and the luminance signal (Y), R = (Y−C2 · 3 · G−C3 · 2 · B) / (2 · C1), G = (Y−C1 · 2)・ R-C3 ・ 2 ・B) / (3.multidot.C2), B = (Y-C1.multidot.2.multidot.R-C2.multidot.G) / (2.multidot.C3) to extract the R, G, B color signals to achieve a further effect. Is achieved.

  In addition, an imaging unit that captures a color image, a luminance extraction unit that extracts a luminance signal from a color image signal output from the color image imaging element of the imaging unit, and writes the luminance signal as grayscale data in the first frame memory; Color difference generation means for generating a color difference signal from both a color image signal output from the color image pickup device and a luminance signal extracted by the luminance extraction means; a color difference signal generated by the color difference generation means and the luminance extraction Color extracting means for extracting R, G, B color signals from both of the luminance signals extracted by the means, and writing them in a second frame memory for each of the R, G, B planes as color data of the three primary colors; The gray scale data, the R plane color data, the G plane color data, and the B plane according to the code to be read. This is achieved by recognizing the code using any one of the color data and, if the data cannot be recognized, switching to other data and recognizing the code. .

  Further, the luminance extraction means calculates from the color image signal using k1, k2, k3, k4, k5 as correction coefficients set in advance according to the sensitivity characteristics and visibility of the color filter of the color image pickup device. The luminance signal (Y) is generated by the equation Y = k1 · R + k2 · G + k3 · B, and the color difference generating means calculates an arithmetic expression RY = R− (k1) from the color image signal and the luminance signal (Y). The color difference signals (R−Y) and (B−Y) are generated by R + k2 · G + k3 · B) and B−Y = B− (k1 · R + k2 · G + k3 · B), and the color extraction means is an arithmetic expression The R, G, B color signals are extracted by R = Y + (R−Y), G = Y−k4 · (R−Y) −k5 · (B−Y), and B = Y + (B−Y). Is achieved more effectively.

  Furthermore, the information processing apparatus further includes a registration unit that registers a correspondence between the code to be read and data used for recognition of the code in a correspondence table for each type of code to be read, and the code recognition unit corresponds to the code to be read. Data registered as the first priority in the code recognition processing, and when a plurality of codes are registered in the correspondence table, the code recognition means uses the data used for the current recognition or the use Using frequently used data as the first priority for the next code recognition process, and when a plurality of codes are registered in the correspondence table, the code recognition means corresponds to the code designated in advance by the user. The data is used as the first priority in the code recognition process, and the registration to the correspondence table by the registration means is performed in advance on the sample It is automatically performed by reading over de, respectively is more effectively achieved by.

  According to the present invention, each color data of the primary color plane (R, G, B) generated from the gray scale data and the complementary color component signal (or color difference signal) and the luminance signal according to each code to be read. When the code is recognized using either of them and the data cannot be recognized, the code is recognized by switching to another data, so that a specific code that cannot be read by a conventional code reader is used. A code having a color can also be read.

  FIG. 1 shows an example of the configuration of a code reading device according to a first embodiment of the present invention. The code reading apparatus shown in the figure is an imaging means for picking up a color image, for example, Cy (cyan), Ye (yellow), G (green), Mg (magenta), as in the example of the cell arrangement shown in FIG. ) Is used (for example, a CCD type or CMOS type imaging camera, or a line sensor in which color image elements are linearly arranged).

  A luminance extraction circuit 13A and a color extraction circuit 14A are connected in parallel to the output of the color image pickup device 11A via an AD converter 12, and the color image signal obtained from the color image pickup device 11A is the AD converter 12. Are sent to the luminance extraction circuit 13A and the color extraction circuit 14A through the same, and processed in parallel. The luminance signal extracted by the luminance extraction circuit 13A is written in the gray scale frame memory 15 as gray scale data (luminance value expressed in gray scale). The output line of the luminance extraction circuit 13A is connected to the input of the color extraction circuit 14A, and the luminance signal extracted from the color image signal is sent to the color extraction circuit 14A.

  The color extraction circuit 14A is a circuit that extracts and generates color signals (R, G, B signals) from both the A / D converted color image signal and the luminance signal extracted by the luminance extraction circuit 13A. The obtained color signal is written and stored in the color frame memory 16 for each of the R, G, and B planes as color data of the three primary colors (R, G, and B). In the present invention, code recognition processing is executed using any one of gray scale data, R plane color data, G plane color data, and B plane color data according to the code to be read. At the same time, when the data cannot be recognized, the data is switched to other data and the code recognition process is executed.

  The CPU circuit unit 19 includes a CPU, a RAM, a ROM, an input / output interface, and the like. The CPU circuit unit 19 controls the driving of the color image pickup device 11A via the image pickup device drive circuit 17, and the luminance extraction circuit 13A and the color extraction circuit. The operation of 14A is controlled. Further, the gray scale data and the three primary color image data written in the frame memories 15 and 16 are transmitted to, for example, an external information processing apparatus under the control of the CPU circuit unit 19. Code recognition (decoding) based on grayscale data or color image data is performed in the code reader or on the information processing apparatus side.

  FIG. 3 shows a connection form between the code reading device 10 and the information processing device 20 (host computer, portable computer, etc.). The code reading device 10 and the information processing device 20 are connected to the communication means 3 (wireless communication means). Or a communication cable). The processing mode of the data written in the frame memory of the code reading device 10 is not limited to the mode of transmitting in real time to the information processing device 20 via the communication means 3, but the RAM or memory card in the code reading device 10 , A data storage means for storing and recording on a transferable recording medium such as a PC card, etc., and a form in which the accumulated recognition data can be batch processed in a batch processing form, and both forms can be selected as a form Also good. Also, the color original image may be transmitted to the outside (the information processing apparatus 20 or the like) using the raw image data written in the frame memory, or may be recorded on the recording medium as described above. Although it is good, it is good also as a processing form which compresses data using image compression techniques, such as JPEG (Joint photographic experts group), transmits to the exterior using this compressed data, or records on a recording medium.

  Further, in a code reading apparatus having a storage function and a communication function, the operator selects a mode (for example, a first mode for storing, a second mode for transmitting in real time, and a third mode for storing and transmitting in real time). It may be selected and used. Furthermore, the data stored in the recording medium may be fetched collectively or selectively by a transmission request from the external computer side. Note that a portable code reader that operates alone is also included in the present invention.

  An operation example in the first embodiment of the code reading apparatus according to the present invention having the above-described configuration will be described. FIG. 4 shows an example of an external configuration of the code reading device. The code reading device in this example is a hand-held type that can be operated by an operator with one hand, and a reading unit 10 a is provided at the tip of one end of the main body 10. A numeric keypad 10b for inputting commands such as registration, deletion, display, and guidance of the original image of the read object and its code data is displayed on the upper surface of the other end of the main body 10 and predetermined items. A display unit 10c made of liquid crystal or the like is provided.

  When using this code reader, the operator sees the image displayed on the display unit 10c (or with the guide light indicating the imaging area projected on the imaging object) and reads 2 of the reading object. The trigger button 10d provided at the inner corner of the main body 10 is adjusted by adjusting the imaging range so that the three-dimensional code or the one-dimensional code (or the code to be read and the management target) is within the imaging area of the code reader. Press to instruct image capture. By depressing the trigger button 10d, the light reflected from the two-dimensional area is incident on the lens unit, and the formed image is picked up by the color image pickup element 11A. Then, the A / D converted color image signals of the respective pixels (in this example, signals of complementary color components (Cy, Ye, G, Mg)) are sent to the luminance extraction circuit 13A and the color extraction circuit 14A, respectively. The

In the luminance extraction circuit 13A, a luminance signal (Y) is generated from Cy, Ye, G, and Mg color pixel signals at each pixel position constituting the color image, and is written in the grayscale frame memory 15 as grayscale data. The luminance signal (Y) is sent to the color extraction circuit 14A. Here, the luminance component is extracted from the color image signal (Cy, Ye, G, Mg) of each pixel of the color image, but the luminance component is extracted, that is, the luminance is extracted from the color image signal (Cy, Ye, G, Mg). Conversion to the signal (Y) is performed by the following equation (1).
[Equation 1]
Y = Cy + Ye + G + Mg = C1 ・ 2 ・ R + C2 ・ 3 ・ G + C3 ・ 2 ・ B
Here, Cy = B + G, Ye = R + G, Mg = R + B
On the other hand, in the color extraction circuit 14A, the color image signal (Cy, Ye, G, Mg) from the color image pickup device 11A is input and the luminance signal (Y) is input from the luminance extraction circuit 13A. The color components (R, G, and B image components) are extracted by Equations 3 and 4.
[Equation 2]
R = (Y−C2 · 3 · G−C3 · 2 · B) / (2 · C1)
[Equation 3]
G = (Y−C1 · 2 · R−C3 · 2 · B) / (3 · C2)
[Equation 4]
B = (Y-C1, 2, R-C2, 3, G) / (2, C3)
Here, C1, C2, and C3 are coefficients determined by the sensitivity characteristic of the color filter of the color image pickup element 11A, the visibility, and the like, and 0 <C1, C2, C3 ≦ 1.

  Then, the color extraction circuit 14A writes the extracted color component (R, G, B) signals as color image data in the color frame memory 16 for each primary color plane (R plane, G plane, B plane). In the CPU circuit unit 19, for example, color image data (or color image data and grayscale data) is compressed and stored in a storage unit such as a RAM in association with a code recognition result, and information is transmitted via the communication unit 3. It transmits to the processing apparatus 20 side.

  Next, an operation example during code recognition will be described with reference to the flowchart of FIG.

  The code recognition processing of the one-dimensional code and the two-dimensional code is performed on the CPU circuit unit 19 of the code reading device or the information processing device 20 connected via the communication unit 3. Here, a case where the CPU circuit unit 19 includes code recognition means will be described as an example. The code decoding algorithm uses a known technique, and the description thereof is omitted here.

  In the code recognition means, first, gray scale data (1 frame luminance signal (Y) data) is read from the gray scale frame memory 15, and code recognition processing is executed based on the gray scale data (step S1). At this time, if recognition (decoding) using grayscale data has failed (step S2), data of the first primary color plane (R plane in this example) is read from the color frame memory 16, and based on the data A code recognition process is executed (step S3). If the first primary color plane data cannot be recognized (step S4), the data of the second primary color plane (G plane in this example) is read from the color frame memory 16, and a code is generated based on the data. Recognition processing is executed (step S5). If the second primary color plane data cannot be recognized (step S6), the data of the third primary color plane (B plane in this example) is read from the color frame memory 16, and a code is generated based on the data. Recognition processing is executed (step S7). If the code has been successfully recognized in steps S2, S4, S6, and S8, that is, recognition by any one of the color data of the gray scale data and the three primary color planes generated by the equations (2), (3), and (4). If is successful, the code recognition process is terminated.

  As described above, when the code cannot be recognized by the gray scale data, the code is recognized by the color image data (color data of the R, G, and B planes) generated from both the color image signal and the luminance signal composed of the complementary color components. By processing, a single color code printed on paper, etc., a code that is directly marked on the surface of an object with a color such as metal, ceramics, polymer compound, etc. It is also possible to read a code having a color that could not be read so far, such as a code.

  In the operation example at the time of code recognition described above, the case where the code recognition process is automatically executed by the data of each color component when the grayscale data cannot be recognized has been described as an example. It is good also as the form which sets beforehand whether to perform. For example, the correspondence between the code to be read and the data used for code recognition is classified mainly according to the color component of the code such as the type of code to be read (for example, black and white code, code formed on ceramics, etc. A registration unit that registers each code) in the correspondence table, and the code recognition unit uses the data registered in correspondence with the code to be read as the first priority for the code recognition process; It is possible to recognize by one recognition process. Registration in the correspondence table by the registration means is preferably performed automatically by reading a sample code in advance, but the type of code to be read and data used for recognition of the code (grayscale data) It may be possible to manually register which color data of the three primary color planes is used. Further, when a plurality of codes are registered in the correspondence table, the code recognition unit uses the data used for the current recognition or the actual data having a high frequency of use as the first priority for the next code recognition process. Anyway. Alternatively, the user may designate the type to be read in advance, and the data corresponding to the designated code may be used in the code recognition process with the highest priority.

  Further, in addition to the code reading function, it includes management target recording means for recording an original image (color image data) obtained by imaging a management target in association with the decoded code information, and various certificates, newspapers, books , Structure to manage management objects such as documents such as printed materials in a database and store the management objects in association with code information (code consisting of character string such as classification number, securities number, document number, date) It is also good.

  Next, a second embodiment of the code reading device according to the present invention will be described. In the first embodiment described above, the code reading device using the color image pickup element 11A of the complementary color array is taken as an example, whereas in the second embodiment, the color image pickup element or the primary color array of the complementary color array is used. This is an example of a code reading device that can be applied to any color image pickup device. In the second embodiment, color image data of R, G, and B color components is generated from the luminance signal and the color difference signal, and the color image data (color data of each plane of R, G, and B) or gray It is characterized by recognizing codes using scale data.

  FIG. 6 shows a configuration example of the code reader according to the second embodiment of the present invention corresponding to FIG. 1, and the same components as those of the first embodiment shown in FIG. The description is omitted.

  In FIG. 6, the color image pickup element 11 </ b> B is a complementary color array image sensor or a primary color array color image pickup element. Here, the primary color array color image pickup element is taken as an example. In the second embodiment, the luminance extraction circuit 13B and the color difference generation circuit 18 are connected in parallel to the output of the color image pickup element 11B via the AD converter 12, and the output is obtained from the color image pickup element 11B. The color image signal is sent to the luminance extraction circuit 13B and the color difference generation circuit 18 through the AD converter 12 and processed in parallel.

  The output line of the luminance extraction circuit 13B is connected to the input of the color difference generation circuit 18, and the luminance signal extracted from the color image signal from the color image pickup device 11B is sent to the color difference generation circuit 18. The color extraction circuit 14B is configured to input the luminance signal extracted by the luminance extraction circuit 13B and the color difference signal generated by the color difference generation circuit 18.

  In such a configuration, generation processing of gray scale and three primary color data used for code recognition will be described.

In the case of a color image pickup device having a primary color array, the luminance extraction circuit 13B extracts the luminance signal (Y) by the following equation 5 and writes it into the grayscale frame memory 15 as grayscale data, and also extracts the extracted luminance signal (Y ) To the color difference generation circuit 18 and the color extraction circuit 14B.
[Equation 5]
Y = k1, R + k2, G + k3, B
Here, k1, k2, and k3 are coefficients determined by the sensitivity characteristic of the color filter of the color image pickup element 11B, the visual sensitivity, and the like, and 0 <k1, k2, k3 ≦ 1.

The color difference generation circuit 18 is a circuit that generates a color difference signal from both the color image signal obtained from the color image pickup device 11B and the luminance signal (Y) generated by the luminance extraction circuit 13B. The color difference signals (R−Y) and (B−Y) are respectively generated by Expression 7. The generated color difference signals (R−Y) and (B−Y) are sent to the color extraction circuit 14B.
[Equation 6]
RY = R- (k1, R + k2, G + k3, B)
= (1-k1) * R-k2 / G-k3 * B
[Equation 7]
B−Y = B− (k1, R + k2, G + k3, B)
= (1−k3) ・ B−k2 ・ G−k1 ・ R
In the color extraction circuit 14B, the luminance signal (Y) is input from the luminance extraction circuit 13B, and the color difference signals (R−Y) and (B−Y) are input from the color difference generation circuit 18. The color components (R, G, and B image components) of the three primary colors are extracted from Equation (10).
[Equation 8]
R = Y + (R−Y)
[Equation 9]
G = Y−k4 · (R−Y) −k5 · (B−Y)
[Equation 10]
B = Y + (BY)
Here, k4 and k5 are coefficients determined by the sensitivity characteristics and the visibility of the color filter of the color image pickup element 11B, similarly to k1 to k3, and 0 <k4, k5 ≦ 1.

  Then, the extracted color component (R, G, B) data is written in the color frame memory 15 for each primary color plane (R plane, G plane, B plane) as two-dimensional array color image data.

As described above, the code is generated using the gray scale data generated by extracting the color component from the color image signal and the color image data (color data of each plane of R, G, B) generated from the luminance signal and the color difference signal. By performing the recognition process, it is possible to read a code having a color that could not be read up to now, as in the first embodiment. However, a stationary type is also included in the present invention. Furthermore, although the luminance generation circuit, the color extraction circuit, and the color difference generation circuit have been described by way of example of inputting an A / D conversion value of an AD converter, an analog signal may be processed. Furthermore, the generation processing of the luminance signal, the color signal, and the color difference signal has been described as an example where it is realized by a circuit (hardware), but the A / D conversion value of the signal from the imaging unit is input by the CPU circuit unit, It is good also as a form processed with the program run by a computer.

  In addition to being applicable to code readers of one-dimensional codes and two-dimensional codes, color code readers using color as an information element, or original image data of information sources such as various certificates, newspapers, books, documents, etc. The present invention can also be applied to an apparatus for capturing and managing original image data in association with an identification code.

It is a block diagram which shows the structural example in 1st Embodiment of the code reader which concerns on this invention. It is a schematic diagram which shows the example of the cell arrangement | sequence in the color image pick-up element of a complementary color arrangement | sequence. It is a block diagram which shows the connection form of a code reader and information processing apparatus. It is a perspective view which shows an example of the external appearance structure of the code reader which concerns on this invention. It is a flowchart for demonstrating the operation example at the time of the code recognition of the code reader concerning this invention. It is a block diagram which shows the structural example in 2nd Embodiment of the code reader which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1D / 2D code 2 Management object 3 Communication means 10 Code reader 11A Color image pick-up element (color imager of complementary color arrangement)
11B color image pickup device (primary color array or complementary color array color imager)
12 AD converters 13A, 13B Luminance extraction circuits 14A, 14B Color extraction circuit 15 Gray scale frame memory 16 Color frame memory 17 Image sensor drive circuit 18 Color difference generation circuit 19 CPU circuit unit 20 Information processing apparatus

Claims (8)

A code reading device that reads a black and white code and a code having a color optically in a non-contact manner as a reading target,
Luminance signals are extracted from the color image signals of the complementary color components output from the image pickup means for picking up a color image with the color image pickup device of the complementary color array, and written into the first frame memory as grayscale data. R, G, and B color signals are extracted from both the luminance extraction means to be included, the color image signal of the complementary color component output from the color image pickup device, and the luminance signal extracted by the luminance extraction means, and the colors of the three primary colors Color extracting means for writing to the second frame memory for each R, G, B plane as data, and the gray scale data, R plane color data, G plane color data according to the code to be read , And the B plane color data are used to recognize the code, and the data cannot be recognized. If the code reading apparatus characterized by comprising a recognizing code recognition means the code switch to other data.   The color image pickup device of the complementary color array is an image pickup device made of Cy (cyan), Ye (yellow), G (green), and Mg (magenta), and the sensitivity characteristics of the color filter of the color image pickup device of the complementary color array And the correction coefficients set in advance according to the visibility as C1, C2, and C3, the luminance extraction means calculates an arithmetic expression Y = Cy + Ye + G + Mg = C1 · from the signal of the complementary color components (Cy, Ye, G, Mg). The luminance signal (Y) is generated by 2 · R + C2 · 3 · G + C3 · 2 · B, and the color extraction means sets Cy = B + G, Ye = R + G, and Mg = R + B as the complementary color components (Cy, Ye, G). , Mg) and the luminance signal (Y), R = (Y−C2 · 3 · G−C3 · 2 · B) / (2 · C1), G = (Y−C1 · 2 · R) -C3 ・ 2 ・ B) / ( 3. The color signals of R, G, and B are extracted by 3 · C2), B = (Y−C1 · 2 · R−C2 · 3 · G) / (2 · C3). The code reader according to the description. A code reading device that reads a black and white code and a code having a color optically in a non-contact manner as a reading target,
An image pickup means for picking up a color image, a luminance extraction means for extracting a luminance signal from a color image signal output from a color image pickup device of the image pickup means, and writing it in a first frame memory as grayscale data, and the color A color difference generation unit that generates a color difference signal from both a color image signal output from the image pickup device and a luminance signal extracted by the luminance extraction unit, and a color difference signal generated by the color difference generation unit and the luminance extraction unit Color extraction means for extracting R, G, B color signals from both of the extracted luminance signals, and writing them into a second frame memory for each of the R, G, B planes as color data of the three primary colors; The gray scale data, the color data of the R plane, the color data of the G plane, and the color of the B plane according to the code of And a code recognizing unit for recognizing the code by switching to other data when the data is not recognized by the data. Code reader.   The correction coefficient preset according to the sensitivity characteristic and the visibility of the color filter of the color image pickup device is set as k1, k2, k3, k4, k5, and the luminance extraction unit calculates the calculation formula Y from the color image signal. = B1 · R + k2 · G + k3 · B, the luminance signal (Y) is generated, and the color difference generation means calculates an arithmetic expression R−Y = R− (k1 · R + k2) from the color image signal and the luminance signal (Y). G + k3 · B), B−Y = B− (k1 · R + k2 · G + k3 · B) to generate the color difference signals (R−Y) and (B−Y). Extracting the R, G, B color signals by Y + (R−Y), G = Y−k4 · (R−Y) −k5 · (B−Y), B = Y + (B−Y). The code reader according to claim 3.   It further comprises registration means for registering the correspondence between the code to be read and the data used for recognition of the code in a correspondence table for each type of code to be read, the code recognition means corresponding to the code to be read 4. The code reading apparatus according to claim 1, wherein registered data is used as a first priority in the code recognition process.   When a plurality of codes are registered in the correspondence table, the code recognition means uses data used for recognition this time or frequently used data as a first priority for the next code recognition processing. The code reader according to claim 5.   The code recognition unit uses data corresponding to a code designated in advance by a user as a first priority for code recognition processing when a plurality of codes are registered in the correspondence table. 5. The code reading device according to 5.   6. The code reading apparatus according to claim 5, wherein the registration by the registration means is automatically performed by reading a sample code in advance.

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