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US20130162592A1 - Handwriting Systems and Operation Methods Thereof - Google Patents

Handwriting Systems and Operation Methods Thereof Download PDF

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Publication number
US20130162592A1
US20130162592A1 US13/663,470 US201213663470A US2013162592A1 US 20130162592 A1 US20130162592 A1 US 20130162592A1 US 201213663470 A US201213663470 A US 201213663470A US 2013162592 A1 US2013162592 A1 US 2013162592A1
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United States
Prior art keywords
light source
image
plane
handwriting system
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/663,470
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English (en)
Inventor
Han-Ping CHENG
Shu-Sian Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pixart Imaging Inc
Original Assignee
Pixart Imaging Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pixart Imaging Inc filed Critical Pixart Imaging Inc
Assigned to PIXART IMAGING INC. reassignment PIXART IMAGING INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHENG, HAN-PING, YANG, SHU-SIAN
Publication of US20130162592A1 publication Critical patent/US20130162592A1/en
Priority to US14/876,820 priority Critical patent/US9519380B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0425—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
    • G06F3/04883—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures for inputting data by handwriting, e.g. gesture or text

Definitions

  • the present invention relates to the touch technique field, and more particularly to handwriting systems and operation methods thereof.
  • the sensed objects may not be recognized correctly due to the background light source interference resulted from the varying of operational environments.
  • the conventional handwriting system may have a performance easily affected by the background light.
  • the predetermined operation zone i.e., a virtual input zone
  • the operational environment e.g., a table's top surface
  • the predetermined operation zone i.e., a virtual input zone
  • users may feel inconvenient to operate the conventional handwriting system if the table's top surface (specifically, the predetermined operation zone) associated with the handwriting system is disorder.
  • the present invention provides a handwriting system with a performance not easily being affected by a background light source.
  • the present invention also provides an operation method of the aforementioned handwriting system with a performance not easily being affected by a background light source.
  • the present invention further provides a handwriting system with an adjustable operation zone, thus the handwriting system is not easily affected by an operation environment.
  • the present invention still further provides an operation method of the aforementioned handwriting system with an adjustable operation zone.
  • the present invention provides a handwriting system, which includes a light source module, an image sensing apparatus and a processing circuit.
  • the light source module is configured to provide a light source to illuminate an object on a plane.
  • the image sensing apparatus is disposed on the plane and configured to capture an image of the object reflecting the light source.
  • the processing circuit is electrically connected to the image sensing apparatus and configured to receive the image captured by the image sensing apparatus, analyze the shape of each of light spot(s) in the captured image and filter out the light spot(s) not qualified to the shape of the object.
  • the present invention also provides an operation method of a handwriting system.
  • the handwriting system includes a light source module, an image sensing apparatus and a processing circuit.
  • the light source module is configured to provide a light source to illuminate an object on a plane.
  • the image sensing apparatus is disposed on the plane and configured to capture an image of the object reflecting the light source.
  • the operation method includes steps of: obtaining the image captured by image sensing apparatus; analyzing the shape of each of light spot(s) in the captured image; and filtering out the light spot(s) not qualified to the shape of the object.
  • the captured image is converted into a binary image and the binary image is determined, by using Hough Transform, whether or not having any light spot qualified to the shape of the object.
  • the present invention further provides a handwriting system includes a light source module, an image sensing apparatus and a processing circuit.
  • the light source module is configured to provide a light source to illuminate at least one object on a plane.
  • the image sensing apparatus is disposed on the plane and configured to capture an image of the object(s) reflecting the light source.
  • the processing circuit electrically connected to the image sensing apparatus, is configured to receive the image captured by the image sensing apparatus and calculate, if the captured image has a single light spot therein, the position of a single object relative to the plane according to image characteristics and imaging position of the single light spot in the captured image.
  • the processing circuit when operating in an operation zone converting mode, is further configured to define an indicated operation zone according to at least two positions sequentially inputted by an object and map a predetermined operation zone of the handwriting system into the indicated operation zone through performing a coordinate transform by using a matrix operation.
  • the present invention still further provides an operation method of a handwriting system.
  • the handwriting system includes a light source module, an image sensing apparatus and a processing circuit.
  • the light source module is configured to provide a light source to illuminate at least one object on a plane.
  • the operation method includes steps of: obtaining the image captured by the image sensing apparatus; calculating, if the captured image has a single light spot therein, the position of a single object relative to the plane according to image characteristics and imaging position of the single light spot in the captured image; and defining, when the handwriting system operates in an operation zone converting mode, an indicated operation zone according to at least two positions sequentially inputted by one object and mapping a predetermined operation zone of the handwriting system into the indicated operation zone through performing a coordinate transform by using a matrix operation.
  • the operation method further includes steps of: calculating, if the captured image has a plurality of light spots therein, the positions of a plurality of objects relative to the plane according to image characteristics and imaging position of the light spots in the captured image; and defining, when the handwriting system operates in the operation zone converting mode, the indicated operation zone according to four positions sequentially inputted by two individual objects, wherein the two objects each are associated with two positions.
  • the operation method further includes steps of: calculating, if the captured image has a plurality of light spots therein, the positions of a plurality of objects relative to the plane according to image characteristics and imaging position of the light spots in the captured image; and defining, when the handwriting system operates in an operation zone converting mode, the indicated operation zone according to four positions inputted by four individual objects at a same time.
  • the matrix operation comprises a homogeneous matrix operation.
  • the processing circuit of the handwriting system first analyzes the shape of each of the light spot(s) in the image captured by the image sensing apparatus and filters out the light spot(s) not qualified to the shape of the object. Therefore, the handwriting system of the present invention can have a performance not easily affected by the background light source.
  • the processing circuit further calculates, if the captured image has a single light spot therein, a position of a single object relative to the plane according to the image characteristics and imaging position of the single light spot; or, calculates, if the captured image has a plurality of light spots therein, the positions of a plurality of objects relative to the plane according to the image characteristics and imaging positions of the light spots.
  • the handwriting system operating in an operation zone converting mode defines an indicating operation zone according to four positions; wherein the four positions are sequentially inputted by one single object, or by two individual objects and each of the two objects is associated with two positions, or inputted at the same time by four individual objects. Then, a coordinate transform is performed on a predetermined operation zone by using a matrix operation so as to map the predetermined operation zone to the indicated operation zone. Therefore, the handwriting system of the present invention can have an adjustable operation zone without being affected by the operational environments.
  • FIG. 1 is a schematic view illustrating a handwriting system in accordance with an embodiment of the present invention
  • FIG. 2 is a schematic view illustrating an exemplified image of an object captured by the image sensing apparatus shown in FIG. 1 ;
  • FIG. 3 is a schematic view illustrating another exemplified image of an object captured by the image sensing apparatus shown in FIG. 1 ;
  • FIG. 4 is a schematic flow chart illustrating an operation method of a handwriting system in accordance with another embodiment of the present invention.
  • FIG. 5 is schematic view illustrating a plane shown in FIG. 1 and an indicated operation zone defined therein;
  • FIG. 6 is a schematic flow chart illustrating an operation method of a handwriting system in accordance with another embodiment of the present invention.
  • FIG. 7 is a schematic view illustrating the handwriting system of the present invention integrated into a notebook computer.
  • FIG. 1 is a schematic view illustrating a handwriting system in accordance with an embodiment of the present invention.
  • the handwriting system in this embodiment includes a light source module 104 , an image sensing apparatus 106 and a processing circuit 108 ; wherein the processing circuit 108 is electrically connected to the image sensing apparatus 106 .
  • the light source module 104 is configured to provide a light source for illuminating an object 102 on a plane 110 .
  • the plane 110 has a parallelogram shape, and preferably has a rectangle shape.
  • the plane 110 can be a virtual plane, which is defined by software installed in the processing circuit 108 or defined by specific objects (not shown) disposed at the four corners thereof. Specifically, the plane 110 is parallel to the optical axes of the image sensing apparatus 106 .
  • the image sensing apparatus 106 is disposed on the light source module 104 ; and the present invention is not limited thereto.
  • the light source module 104 includes a laser light source 140 - 1 and an optical element 104 - 2 .
  • the laser light source 104 - 1 is configured to generate a spot light source; and the optical element 104 - 2 is configured to convert the spot light source into a linear light source serving as the light source of the light source module 104 and emitting a plane light at a specific height above the plane 110 .
  • the optical element 104 - 2 can be a cylindrical lens or a Micro Electro Mechanical System (MEMS) scanning mirror.
  • MEMS Micro Electro Mechanical System
  • the cylindrical lens is configured to convert the spot light source emitted from the laser light source 104 - 1 into the linear light source and thereby forming the plane light emitted to the plane 110 .
  • the MEMS scanning mirror is configured to change the emitting direction of the spot light source emitted from the laser light source 104 - 1 so that the light source of the light source module 104 can scan at a specific height above the plane 110 .
  • the light source of the light source module 104 is emitted toward and parallel to the plane 110 and all the plane 110 is within a range capable of being emitted by the light source.
  • the laser light source 104 - 1 can be replaced by an infrared light-emitting diode (IR LED).
  • the image sensing apparatus 106 disposed on the plane 110 , is configured to capture the image of the object 102 reflecting the light source. Specifically, because the object 102 can reflect the light source while being illuminated by the light source, the processing circuit 108 can, after obtaining the image captured by the image sensing apparatus 106 , determine the position of the object 102 relative to the plane 110 through the image characteristics and imaging positions of the light spots in the captured image; wherein the image characteristic herein includes the image brightness or image size of the object 102 .
  • FIGS. 2 , 3 are two schematic views each illustrating an exemplified image of the object 102 captured by the image sensing apparatus 106 ; wherein the object 102 herein is a user's right hand on the plane 110 and the direction of the fingertip of each finger is toward to the right of FIG. 1 . As shown, the main difference between the two images shown in FIGS. 2 , 3 is the height of the right hand relative to the plane 110 . In FIG.
  • the image includes a sub-image 202 of an index finger's fingertip, which serves as an input indicator, and a sub-image 204 of a palm and thumb, which provide no function in this embodiment; wherein the sub-images 202 , 204 are exemplified by being merged together at a position 206 .
  • the image includes a sub-image 302 of an index finger's fingertip, which serves as an input indicator, and sub-images 304 , 306 , which provide no function in this embodiment; wherein the sub-image 302 is not merged with any other sub-image.
  • the processing circuit 108 is further configured to analyze the shape of each of the light spots in the captured image so as to filter out the light spots not qualified to the shape of the object 102 .
  • the processing circuit 108 first converts the captured image into a binary image, determines the captured image whether or not having any light spot qualified to the shape of the object 102 by using Hough Transform, and filters out any light spot not qualified to the shape of the object 102 .
  • the processing circuit 108 first analyzes the three light spots (or, the three sub-images 302 , 304 and 306 ) each in the captured image whether or not having an aspect ratio located within a threshold value, and determines which one of the three spot lights is associated with an index finger's fingertip (or, an input indicator) according to the aforementioned analyzing result.
  • the object 102 can be any other specific object, and accordingly the processing circuit 108 is configured to determine the light spots of the image according to the shape feature of this new specific object.
  • the processing circuit 108 is configured to analyze the captured image whether or not having a light spot with a down point (that is, a down point toward the X-Y plane shown in FIG. 3 ), if the object 102 is a touch pen.
  • the processing circuit 108 can be configured to process the light spot filtering according to the light spot's size. For example, as illustrated in FIG. 3 , the processing circuit 108 can analyze each of the light spots in the captured image whether or not having a size greater than a first threshold value on the y-axis or having a size less than a second threshold value on the x-axis. Specifically, any light spot will be determined as a non-input indicator if having a size greater than the first threshold value on the y-axis or having a size less than a second threshold value on the x-axis.
  • the processing circuit 108 can perform the light spot filtering on each of the light spots according to two individual threshold values on the y-axis and the x-axis; or, according to one same threshold value on the y-axis and the x-axis.
  • the threshold values each are, for example, a predetermined pixel number.
  • the processing circuit 108 may be configured to determine whether or not existing a light spot with a width at a specific position on the y-axis less than a threshold value. Specifically, the processing circuit 108 , if finding a merged light spot having a width at a position (e.g., position 206 ) less than a threshold, is configured to divide the merged light spot into two individual light spots by the position 206 , and then determine each of the two individual light spots whether or not having image characteristics qualified to the shape of the first finger's fingertip (or, an input indicator). In addition, it is to be noted that the processing circuit 108 may directly determine the left light spot as the first finger's fingertip (or, an input indicator) and calculate the selected light spot's coordinate accordingly.
  • a position e.g., position 206
  • the processing circuit 108 may directly determine the left light spot as the first finger's fingertip (or, an input indicator) and calculate the selected light spot's coordinate accordingly.
  • the light spot filtering illustrated in FIGS. 2 , 3 is suitable for single touch; however, the present invention is not limited thereto. In other words, the handwriting system according to the present invention is also applicable to multi touch (as illustrated in FIG. 3 ) if the light spot light filtering is skipped. Therefore, according to the aforementioned description, it is understood that the handwriting system of the present invention can have a performance without being affected easily by the background light source.
  • the light source module 104 can be replaced with a plurality of laser light sources without the employ of the optical element 104 - 2 . Specifically, these laser light source are arranged in parallel thereby being capable of emitting a light source similar to a linear light source.
  • the image sensing apparatus 106 and the light source module 104 can be disposed at any one corner of the plane 110 , and the positions of the image sensing apparatus 106 and the light source module 104 illustrated in FIG. 2 is used for an exemplification only.
  • FIG. 4 is a schematic flow chart illustrating an operation method of a handwriting system in accordance with an embodiment of the present invention.
  • the handwriting system includes a light source module and a light sensing apparatus.
  • the light source module is configured to provide a light source to illuminate an object on a plane.
  • the image sensing apparatus is disposed on the plane and is configured to capture an image of the object reflecting the light source. As illustrated in FIG. 4
  • the operating method of a handwriting system in this embodiment includes steps of: obtaining an image captured by the image sensing apparatus (step S 402 ); analyzing the shape of each of the light spot(s) in the captured image (step S 404 ); and filtering out the light spot(s) not qualified to the object's shape (step S 406 ).
  • step S 404 can be realized by first converting the captured image into a binary image by using Hough Transform and then determining the binary image whether or not having any light spot qualified to the shape of the object.
  • the handwriting system in accordance with the second embodiment of the present invention will be described in the following still with a reference of FIG. 1 , due to having a hardware structure similar to that of the handwriting system in accordance with the first embodiment.
  • the processing circuit 108 is further configured to calculate, if the captured image has a single light spot therein, the position of a single object 102 respective to the plane 110 according to the image characteristics and imaging position of the single light spot in the captured image; or calculate, if the captured image has a plurality of light spots therein, the positions of a plurality of objects 102 respective to the plane 110 according to the image characteristics and imaging positions of the light spots in the captured image.
  • the handwriting system in this embodiment further supports multi touch.
  • the processing circuit 108 in this embodiment can operate in an operation zone converting mode.
  • the processing circuit 108 when operating in an operation zone converting mode, defines an indicated operation zone according to four positions on the plane 110 ; wherein the four positions can be sequentially inputted by one single object 102 , or sequentially inputted by two individual objects 102 and each of the two objects 102 is associated with two positions, or inputted at a same time by four individual objects 102 .
  • FIG. 5 is schematic view illustrating the plane 110 shown in FIG. 1 and an indicated operation zone defined therein.
  • the processing circuit 108 in the operation zone converting mode first determines the number of objects 102 according to the image captured by the image sensing apparatus 106 . If there is one object 102 captured, the processing circuit 108 then defines an indicated operation zone 120 on the plane 110 according to four positions (for example, the four corners of a dotted frame) sequentially inputted by the single object 102 . Or, if there are two individual objects 102 captured, the processing circuit 108 then defines an indicated operation zone 120 on the plane 110 according to four positions (for example, the four corners of a dotted frame) sequentially inputted by the two individual objects 102 and each of the two objects 102 is associated with two positions. Or, if there are four individual objects 102 captured, the processing circuit 108 then defines an indicated operation zone 120 on the plane 110 according to four positions (for example, the four corners of a dotted frame) inputted at the same time by the four individual objects 102 .
  • the processing circuit 108 once obtaining the indicated operation zone 120 , performs a coordinate transform by using a matrix operation (for example, a homogeneous matrix operation), so as to map a determined operation zone defined on the plane 110 to the indicated operation zone 120 .
  • a matrix operation for example, a homogeneous matrix operation
  • the processing circuit 108 originally, is configured to calculate the position of any object 102 in the determined operation zone relative to the plane 110 .
  • the processing circuit 108 in this embodiment is in the operation zone converting mode and the operation zone is converted into the indicated operation zone 120 , only the object(s) located in the indicated operation zone 120 will be calculated by the processing circuit 108 for the position thereof. Because the operation zone is adjustable, the handwriting system of the present invention can be prevented from being affected by the operational environment.
  • FIG. 6 is a schematic flow chart illustrating an operation method of a handwriting system in accordance with another embodiment of the present invention.
  • the handwriting system includes a light source module and a light sensing apparatus.
  • the light source module is configured to provide a light source to illuminate at least one object on a plane.
  • the image sensing apparatus is disposed on the plane and configured to capture the image of the object(s) reflecting the light source.
  • the operation method includes steps of: obtaining the image captured by the image sensing apparatus (step S 602 ); calculating, if the captured image has a single light spot therein, the position of a single object relative to the plane according to image characteristics and imaging position of the single light spot in the captured image (step S 604 ); and defining, when the handwriting system operates in an operation zone converting mode, an indicated operation zone according to at least two positions sequentially inputted by one object and mapping a predetermined operation zone of the handwriting system into the indicated operation zone through performing a coordinate transform by using a matrix operation (step S 606 ).
  • the coordinate transform in step S 606 can be realized by using a homogeneous matrix operation.
  • the functions provided by the processing circuit 108 of both the first and second embodiments can be integrated into one single processing circuit, so that the associated handwriting system can have a full function and is more competent.
  • the handwriting system of the present invention is applicable to be integrated into some specific electronic apparatuses (for example, notebook computers) or input devices (for example, keyboards).
  • the handwriting system of the present invention is integrated into one side of electronic apparatus or input device as illustrated in FIG. 7 , which is a schematic view illustrating the handwriting system of the present invention integrated into a notebook computer.
  • the handwriting system is disposed on one side of the notebook computer 702 and includes a processing circuit 712 , an image sensing apparatus 714 and a light source module 716 .
  • the image sensing apparatus 714 and the light source supply 716 are arranged to have the sensing surface 714 - 1 and the emitting surface 716 - 1 exposed from the housing of the notebook computer 702 , respectively; or, a portion of the housing of the notebook computer 702 corresponding to the sensing surface 714 - 1 and the emitting surface 716 - 1 is transparent.
  • the processing circuit of the handwriting system first analyzes the shape of each of the light spot(s) in the image captured by the image sensing apparatus and filters out the light spot(s) not qualified to the shape of the object. Therefore, the handwriting system of the present invention can have a performance not easily affected by the background light source.
  • the processing circuit further calculates, if the captured image has a single light spot therein, a position of a single object relative to the plane according to the image characteristics and imaging position of the single light spot; or, calculates, if the captured image has a plurality of light spots therein, the positions of a plurality of objects relative to the plane according to the image characteristics and imaging positions of the light spots.
  • the handwriting system operating in an operation zone converting mode defines an indicating operation zone according to four positions; wherein the four positions are sequentially inputted by one single object, or by two individual objects and each of the two objects is associated with two positions, or inputted at the same time by four individual objects. Then, a coordinate transform is performed on a predetermined operation zone by using a matrix operation so as to map the predetermined operation zone to the indicated operation zone. Therefore, the handwriting system of the present invention can have an adjustable operation zone without being affected by the operational environments.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Position Input By Displaying (AREA)
  • Image Input (AREA)
  • User Interface Of Digital Computer (AREA)
US13/663,470 2011-12-22 2012-10-30 Handwriting Systems and Operation Methods Thereof Abandoned US20130162592A1 (en)

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TW100147978A TWI462032B (zh) 2011-12-22 2011-12-22 手寫系統及其操作方法
TW100147978 2011-12-22

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