CN102298468B - Article image capture device and method for capturing article image of referent article - Google Patents
Article image capture device and method for capturing article image of referent article Download PDFInfo
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- CN102298468B CN102298468B CN201010208454.XA CN201010208454A CN102298468B CN 102298468 B CN102298468 B CN 102298468B CN 201010208454 A CN201010208454 A CN 201010208454A CN 102298468 B CN102298468 B CN 102298468B
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Abstract
The invention relates to an article image capture device and a method for capturing an article image of a referent article. The device is suitable to an optical touch control system and used for capturing the article image of a referent article when the referent article interacts with a touch control surface of the optical touch control system. The device comprises an image sensing device and a processing circuit. The image sensing device is used for sensing the image of the touch control surface. When the referent article approaches the touch control surface, the processing circuit compares information in a sensed image with a threshold value to find out a comparison range, generates another threshold value according to the image information in the comparison range, and compares the another threshold value with the image information in the comparison range so as to capture the article image of the referent article.
Description
Technical field
The present invention relates to a kind of optical touch technology, and particularly relate to the method for the object image of a kind of object image capture device and acquisition indicant.
Background technology
Resistance touch screen can be described as a kind of touch technology that current use amount is maximum, and its drive principle is to utilize the mode of voltage drop to carry out coordinates computed, that is, respectively apply online a voltage in many X-axis lines and Y-axis and drive.Then touched when resistance touch screen, because loop is switched on, and can produce voltage drop, controller can calculate the shared ratio of voltage drop and then further calculate coordinate axis.
Fig. 1 is the stereographic map of existing a kind of optical touch control system.Please refer to Fig. 1, this optical touch control system 100 includes object image capture device 101, panel 104, reflecting element 112～116.Wherein, object image capture device 101 includes again Image sensor apparatus 106 and 108, treatment circuit 110.Image sensor apparatus 106 and 108 is all in order to the image of the touch-control surface 118 on the aforementioned panel 104 of sensing.Treatment circuit 110 electric coupling Image sensor apparatus 106 and 108, to receive this two images that Image sensor apparatus was sensed.In this example, touch-control surface 118 be shaped as quadrilateral, be preferably rectangle.As for above-mentioned these reflecting elements all in order to by light reflection to touch-control surface 118, but can not form the mirror image of touch-control surface 118.In the time of the contiguous touch-control surface 118 of indicant 102 (pointer), the image that treatment circuit 110 just senses according to two Image sensor apparatus is obtained the position of indicant 102.
Fig. 2 is the key diagram that optical touch control system 100 carries out single-point touch.In Fig. 2, label is expressed as identical components with the identical person of label in Fig. 1.As shown in Figure 2, Image sensor apparatus 106 can sense indicant 102 along sensing route 202, and Image sensor apparatus 108 energy senses indicant 102 along sensing route 204.Therefore, as long as the image that treatment circuit 110 can sense according to Image sensor apparatus 106 is obtained the equation of line of sensing route 202, and the image sensing according to Image sensor apparatus 108 is obtained the equation of line of sensing route 204, treatment circuit 110 just can calculate the intersection point of sensing route 202 and 204 so, to further calculate the coordinate of indicant 102 according to this intersection point.
Treatment circuit 110 is before calculating the coordinate of indicant 102, the image that must first sense from Image sensor apparatus 106 is found out the areas imaging (in detail aftermentioned) of indicant 102 the image sensing window of Image sensor apparatus 106, the image that namely treatment circuit 110 must first sense from Image sensor apparatus 106 captures the object image of indicant 102, to further obtain the equation of line of sensing route 202, simultaneously, the image that treatment circuit 110 also must sense from Image sensor apparatus 108 is found out the areas imaging (in detail aftermentioned) of indicant 102 the image sensing window of Image sensor apparatus 108, the image that namely treatment circuit 110 must first sense from Image sensor apparatus 108 captures the object image of indicant 102, to further obtain the equation of line of sensing route 204.Below will be described further this.
With the example that is operating as between treatment circuit 110 and Image sensor apparatus 106, before the contiguous touch-control surface 118 of indicant 102, treatment circuit 110 can be first by Image sensor apparatus 106 sensing touch-control surface 118, to obtain an image that does not contain the object image of indicant 102, and this image be used as to a background video.Then, treatment circuit 110 can reach to obtain the brightness value of N bright pixel in every row pixel of background video, and calculates average brightness or the brightness total value of N selected in every row pixel bright pixel, and then forms an intensity map, and wherein N is natural number.This intensity map is to present in the mode of a curve, and this is because background luminance is common and relation heterogeneous.Fig. 3 is the demonstration example of the intensity map obtained from a background video, and any point shown in this figure in curve is all expressed as the brightness value of the row pixel of background video.
Then,, in the time of indicant 102 contiguous touch-control surface 118, treatment circuit 110 just can be obtained by Image sensor apparatus 106 image of the object image that contains indicant 102.Fig. 4 is the schematic diagram of the image that Image sensor apparatus senses.In Fig. 4, sign 400 is expressed as the image sensing window (image sensing window) of Image sensor apparatus 106.And the white portion that indicates 402 indications is the light reflecting by reflecting element 114 and 116, and on image, form the higher clear zone of brightness (bright zone), this clear zone 402 is exactly main sensing area.Be exactly the dark line that indicant 102 causes as for indicating 404, this is object image.
Obtaining after the image of the object image that contains indicant 102, treatment circuit 110 will be used as this image one sensing image, and adopts the method identical with obtaining aforementioned intensity map to obtain the intensity map of this sensing image.Fig. 5 is painted with another described intensity map.In Fig. 5, the curve that indicates 502 indications is the intensity map of obtaining from described sensing image, and any point in this curve is all expressed as the brightness value of the row pixel of sensing image.And sign W
1the scope of indication is the low intensity range that indicant 102 shield lights cause.Be a threshold value as for the curve that indicates 504 indications, this threshold value 504 is recently obtained according to a default percentage from the obtained intensity map of above-mentioned background image (as shown in Figure 3) by treatment circuit 110.
Continue referring to Fig. 5, to obtain after intensity map 502, treatment circuit 110 just compares intensity map 502 and threshold value 504, to brightness value in intensity map 502 (is being indicated to W lower than the part of threshold value 504
1in the scope of indication) distribution range of corresponding row pixel, be considered as the areas imaging of indicant 102 in the image sensing window 400 of Image sensor apparatus 106.In other words, treatment circuit 110 is exactly to capture this areas imaging W
1image information be used as the object image of indicant 102.So, treatment circuit 110 just can further be obtained according to this areas imaging the equation of line of sensing route 202, and the center of gravity that for example calculates this areas imaging further obtains the equation of line of sensing route 202.In like manner, the operation between treatment circuit 110 and Image sensor apparatus 108 also can be carried out according to the operation between treatment circuit 110 and Image sensor apparatus 106, further to obtain the equation of line of sensing route 204.
But optical touch control system 100 but often goes wrong in carrying out multi-point touch.Illustrate with the operation between treatment circuit 110 and Image sensor apparatus 106, touch touch-control surface 118 when there being two indicants 102, and these two indicants 102 are again quite near each other time, and treatment circuit 110 will be obtained an intensity map from sensing image so.Fig. 6 is painted with described intensity map.In Fig. 6, the curve that indicates 602 indications is the intensity map of obtaining from described sensing image, and any point in this curve is all expressed as the brightness value of the row pixel of sensing image.And the scope that indicates W2 indication is these two low intensity range that indicant 102 shield lights cause.Be a threshold value as for the curve that indicates 504 indications, this threshold value 504 is recently obtained according to a default percentage from the obtained intensity map of a background video by treatment circuit 110.
Known as shown in Figure 6, in the time that threshold value 504 is set get Tai Gao, it is same indicants that treatment circuit 110 will be considered as these two indicants 102.Therefore, treatment circuit 110 cannot further calculate the coordinate of these two indicants 102.
Summary of the invention
For the problems referred to above, object of the present invention is providing a kind of object image capture device exactly, and it can capture multiple indicants object image separately exactly.
Another object of the present invention is to provide a kind of method of the object image that captures indicant, can capture exactly multiple indicants object image separately.
The present invention proposes a kind of object image capture device, is applicable to an optical touch control system, in order to capture the object image of indicant in the time that the touch-control surface of an indicant and optical touch control system is interactive.This object image capture device includes Image sensor apparatus and treatment circuit.Wherein, Image sensor apparatus is in order to the image of sensing touch-control surface.And described treatment circuit couples Image sensor apparatus.In the time of the contiguous touch-control surface of described indicant, treatment circuit is obtained a sensing image by the first Image sensor apparatus, and the information in this sensing image and the first threshold value are compared, to find out a comparison scope.In addition, treatment circuit also produces the second threshold value according to the image information in this comparison scope, so that the image information in more above-mentioned comparison scope and the second threshold value, in order to capture the object image of indicant.
In a preferred embodiment of object image capture device of the present invention, wherein this treatment circuit compares all or part of information in this sensing image and first threshold value, to find out a comparison scope, all or part of information in described sensing image comprises that treatment circuit obtains the brightness value of N in every row pixel of sensing image bright pixel, and calculate average brightness or the brightness total value of the bright pixel of N selected in every row pixel, and then the first intensity map forming, wherein N is natural number.
In a preferred embodiment of object image capture device of the present invention, the scope that wherein above-mentioned comparison scope contains lower than all row information of the first threshold value for brightness value in the first intensity map.
In a preferred embodiment of object image capture device of the present invention, wherein the first threshold value is that treatment circuit is obtained according to the first default number percent from the second obtained intensity map of a background video.Described background video is treatment circuit before the contiguous touch-control surface of indicant, first by Image sensor apparatus sensing touch-control surface, thereby obtain in advance not containing the image of the object image of indicant.And the second intensity map to be treatment circuit obtain by average brightness or the brightness total value of calculating N selected in every row pixel of background video bright pixel.
In a preferred embodiment of object image capture device of the present invention, wherein above-mentioned treatment circuit is recently obtained the second threshold value from the second intensity map according to the second default percentage.
In a preferred embodiment of object image capture device of the present invention, wherein treatment circuit is obtained a minimum point from the segment of curve corresponding to above-mentioned comparison scope of the first intensity map, and obtains the second threshold value taking the brightness value of this minimum point as benchmark increases predetermined luminance again.
In a preferred embodiment of object image capture device of the present invention, the object image that wherein captures indicant comprises that the image information that is less than the second threshold value in acquisition comparison scope is as object image.
The another a kind of method that proposes object image that captures indicant of the present invention, is applicable to an optical touch control system.Described optical touch control system includes touch-control surface and Image sensor apparatus.Wherein, Image sensor apparatus is in order to the image of sensing touch-control surface.Described method includes the following step: in the time of the contiguous touch-control surface of an indicant, utilize Image sensor apparatus to obtain a sensing image, and the information in this sensing image and the first threshold value are compared, to find out a comparison scope; Produce the second threshold value according to the image information in above-mentioned comparison scope; And image information in more above-mentioned comparison scope and the second threshold value are in order to capture the object image of indicant.
In a preferred embodiment of the method for the invention, all or part of information in this sensing image and first threshold value are compared, to find out a comparison scope, wherein said all or part of information comprises the brightness value of N in the every row pixel by obtaining sensing image bright pixel, and calculate average brightness or the brightness total value of the bright pixel of N selected in every row pixel, and then the first intensity map forming, wherein N is natural number.
In a preferred embodiment of the method for the invention, the scope that wherein above-mentioned comparison scope contains lower than all row information of the first threshold value for brightness value in the first intensity map.
In a preferred embodiment of the method for the invention, wherein the first above-mentioned threshold value is to obtain according to the first default number percent by the second obtained intensity map of a background video.This background video, before the contiguous touch-control surface of indicant, first passes through Image sensor apparatus sensing touch-control surface, thereby the image that does not contain the object image of indicant of obtaining in advance.And the second intensity map to be average brightness or brightness total value by calculating N selected in every row pixel of background video bright pixel obtain.
In a preferred embodiment of the method for the invention, recently obtain the second above-mentioned threshold value by the second intensity map according to the second default percentage.
In a preferred embodiment of the method for the invention, wherein from the segment of curve corresponding to above-mentioned comparison scope of the first intensity map, obtain a minimum point, and obtain the second threshold value taking the brightness value of this minimum point as benchmark increases predetermined luminance again.
In a preferred embodiment of the method for the invention, the object image that wherein captures indicant comprises that the image information that is less than the second threshold value in acquisition comparison scope is as object image.
Optical touch control system of the present invention is to utilize two different threshold values to find out the object image of multiple indicants (being actual imaging scope).In actual mode of operation, treatment circuit first utilizes the first threshold value to find out the summary areas imaging of multiple indicants in the image sensing window of Image sensor apparatus, and this summary areas imaging is the comparison scope that need to further compare.Then, treatment circuit produces the second threshold value according to the image information in aforementioned comparison scope again, so that the image information in comparison of aforementioned comparison scope and the second threshold value, and then capture the object image of these indicants, namely find out the actual imaging scope of these indicants.Thus, just can further calculate according to actual imaging scope the coordinate of above-mentioned these indicants.
Therefore,, as long as the design of the size of above-mentioned the second threshold value suitably, treatment circuit just can be found out the object image of these indicants exactly so, and then calculates the actual coordinate of these indicants.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of instructions, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by embodiment, and coordinate accompanying drawing, be described in detail as follows.
Brief description of the drawings
Fig. 1 is the stereographic map of existing a kind of optical touch control system.
Fig. 2 is the key diagram that existing optical touch control system carries out single-point touch.
Fig. 3 is the demonstration example of the intensity map obtained from a background video.
The schematic diagram of the image that Fig. 4 senses for Image sensor apparatus.
Fig. 5 is another intensity map.
Fig. 6 is another intensity map.
Fig. 7 is another intensity map.
Fig. 8 is a kind of Image sensor apparatus that is applicable to applying to optical touch control system of the present invention.
Fig. 9 is the process flow diagram according to the method for the object image of the acquisition indicant of one embodiment of the invention.
Embodiment
The hardware structure that optical touch control system of the present invention adopts is identical with the hardware structure that optical touch control system shown in Fig. 1 adopts, the difference of the two, the object image capture device that is optical touch control system of the present invention is to adopt in another way to operate.Therefore the mode of operation about optical touch control system of the present invention, describes continuing to use the hardware structure shown in Fig. 1.
Please refer to Fig. 1.As shown in Figure 1, touch-control surface 118 has four limits (not indicating) that sequentially connect, and Image sensor apparatus 106 and 108 is arranged on two different corners of touch-control surface 118, and is all positioned at same one side of touch-control surface 118.So, Image sensor apparatus 106 and 108 just can carry out from two different angles the image of sensing touch-control surface 118.
Next, by the multi-point touch mode of explanation optical touch control system of the present invention.With the example that is operating as between treatment circuit 110 and Image sensor apparatus 106, before also without any the contiguous touch-control surface 118 of indicant 102, treatment circuit 110 can be first by Image sensor apparatus 106 sensing touch-control surface 118, to obtain the image that does not contain the object image of indicant 102, and using this image as a background video.Then, treatment circuit 110 can reach to obtain the brightness value of N bright pixel in every row pixel of background video, and calculates average brightness or the brightness total value of N selected in every row pixel bright pixel, and then forms an intensity map, and wherein N is natural number.
Then, when there being the contiguous touch-control surface 118 of two indicants 102, and these two indicants 102 are again quite near each other time, and treatment circuit 110 just can be obtained by Image sensor apparatus 106 image of the object image that contains these two indicants 102.Obtaining after the image of the object image that contains these two indicants 102, treatment circuit 110 will be used as this image one sensing image.Certainly, this sensing image is the sensing image that comprises infrared ray monochrome information.Then, treatment circuit 110 can compare all or part of information in this sensing image and the first threshold value, to find out the summary areas imaging in the image sensing window of Image sensor apparatus 106 of these two indicants 102, and this summary areas imaging is the comparison scope (aftermentioned in detail) that need to further compare.In this example, described all or part of information is the brightness value that treatment circuit 110 is obtained in every row pixel of above-mentioned sensing image N bright pixel, and adopts method obtained another intensity map identical with obtaining aforementioned intensity map.And described threshold value is obtained according to a default number percent from the obtained intensity map of above-mentioned background image by treatment circuit 110.Fig. 7 is painted with another described intensity map.
In Fig. 7, the curve that indicates 602 indications is the intensity map of obtaining from described sensing image, and any point in this curve is all expressed as the brightness value of the row pixel of sensing image.And sign W
2the scope of indication is these two low intensity range that indicant 102 shield lights cause.The curve that indicates 504 indications is the first threshold value.After being specified in as for the effect that indicates 702 indication dotted lines.As shown in Figure 7, W
2the low intensity range of indication is exactly the summary areas imagings of these two indicants 102 in the image sensing window of Image sensor apparatus 106, namely needs the comparison scope of further comparing.And the scope that in the intensity map that this comparison scope is exactly sensing image, brightness value is contained lower than all row information of the first threshold value.In other words, treatment circuit 110 compares intensity map 602 and the first threshold value 504 exactly, and brightness value in intensity map 602 (is being indicated to W lower than the part of the first threshold value 504
2in the scope of indication) distribution range of corresponding row pixel, be considered as first areas imaging of these two indicants 102 in the image sensing window 400 of Image sensor apparatus 106.And the summary areas imaging that this first areas imaging is exactly these two indicants 102.
Continue referring to Fig. 7, obtaining after aforesaid comparison scope, treatment circuit 110 can produce the second threshold value according to the image information in this comparison scope, to compare image information and the second threshold value in this comparison scope, and then finds out the actual imaging scope of these indicants 110.The producing method of the second threshold value will be further illustrated below.
In this example, treatment circuit 110 from intensity map 602 corresponding to the segment of curve of above-mentioned comparison scope (i.e. the first areas imaging) (at scope W
2in segment of curve) in obtain a minimum point.And because this routine A point and B point are all minimum point, therefore treatment circuit 110 can be appointed and get a bit in these 2.Then, treatment circuit 110 just resets the second threshold value between the corresponding brightness of minimum point (A point or B point) therewith at the first threshold value 504.And in this example, treatment circuit 110 is obtained above-mentioned the second threshold value taking the brightness total value of the corresponding row pixel of above-mentioned minimum point as benchmark increases by a predetermined luminance again, this second threshold value is just like shown in the sign 702 of Fig. 7.
Obtaining after above-mentioned the second threshold value 702, treatment circuit 110 just comparison brightness distribution plan 602 corresponding to comparison scope segment of curve and the second threshold value 702, in order to capture the object image of these two indicants.In this example, treatment circuit 110 is the distribution range lower than the corresponding row pixel of part of the second threshold value 702 by brightness total value in this segment of curve, is considered as second areas imaging of above-mentioned these two indicants 102 in the image sensing window 400 of Image sensor apparatus 106.And the actual imaging scope that this second areas imaging is exactly these two indicants 102.In other words, treatment circuit 110 can be got two segment of curve lower than the second threshold value 702 according to the second threshold value 702 in intensity map 602, and then the distribution range of these two corresponding row pixels of segment of curve is considered as to the actual imaging scope of these two indicants 102 in the image sensing window 400 of Image sensor apparatus 106.Say concisely, capture exactly the image information that is less than the second threshold value 702 in comparison scope as the object image of these two indicants.So, treatment circuit 110 just can further be obtained according to the actual imaging scope of these two indicants 102 equation of line of two corresponding sensing routes.
In like manner, the operation between treatment circuit 110 and Image sensor apparatus 108 also can be carried out according to the operation between treatment circuit 110 and Image sensor apparatus 106, further to obtain the equation of line of two other sensing route.Then, treatment circuit 110 just can further be obtained according to these four equation of line the coordinate of these two indicants 102.And from illustrating above, even if above-mentioned these two indicants 102 are quite close each other, optical touch control system of the present invention still can be found out the object image (being actual imaging scope) of these two indicants 102 exactly, and then calculates the actual coordinate of these two indicants 102.Therefore, optical touch control system of the present invention just can carry out the coordinate setting of multi-point touch more exactly.
Although in this example, treatment circuit 110 is to obtain above-mentioned the second threshold value 702 (it is as straight line) taking the brightness total value of an A or the corresponding row pixel of some B as benchmark increases by a predetermined luminance again, but treatment circuit 110 can be also recently to obtain another threshold value (it is curve) from the obtained intensity map of background video according to another default percentage, to replace brightness threshold value 702.Certainly, above-mentioned another threshold value that is used for replacing threshold value 702 can be positioned between an A (or some B) and the first threshold value 504.In addition the minimum brightness value of the intensity map that, treatment circuit 110 also can sensing image in above-mentioned comparison scope is used as the second threshold value.In addition, obtain after an intensity map by the brightness value of every row pixel of calculating background video at treatment circuit 110, just can first this intensity map be recorded, so just do not need to repeat again and again such operation.In addition, treatment circuit 110 can be also to obtain background video by an Image sensor apparatus wherein, and then obtains sensing image by another Image sensor apparatus.
In addition, by above-mentioned teaching, even if having, this area conventionally knows that the knowledgeable should know that object image capture device 101 only comprises an Image sensor apparatus and a treatment circuit, this object image capture device 101 still can be carried out the operation of the above-mentioned object image of obtaining indicant, and can capture exactly multiple indicants object image separately.It is worth mentioning that, each reflecting element of this example all can adopt retro-reflection material (retro-reflective material) to make, to reach better effect.In addition, each reflecting element of this example all can be replaced by light-emitting component, as long as make each light-emitting component all towards touch-control surface 118 and luminous.
Fig. 8 illustrates a kind of Image sensor apparatus that is applicable to applying to optical touch control system of the present invention.Please refer to Fig. 8, infrared ray filtering apparatus 804 and OPTICAL SENSORS (photosensor) 806 that this Image sensor apparatus 800 includes infrared ray (infra-red, IR) lighting device 802, can only allow infrared ray pass through.Wherein OPTICAL SENSORS 806 is to obtain the image of touch-control surface 118 by infrared ray filtering apparatus 804, and in order to be coupled to treatment circuit 110.In addition, infrared illumination device 802 can utilize infrared light-emitting diode (IR LED) to realize, and infrared ray filtering apparatus 804 can utilize infrared filter (IR-pass filter) to realize.
By above-mentioned teaching, also can summarize a kind of method of the object image that captures indicant, one as shown in Figure 9.Fig. 9 is according to the process flow diagram of the method for the object image of the acquisition indicant of one embodiment of the invention, is applicable to an optical touch control system.Described optical touch control system includes touch-control surface and Image sensor apparatus.Wherein, Image sensor apparatus is in order to the image of sensing touch-control surface.The method includes the following step: in the time of the contiguous touch-control surface of an indicant, utilize Image sensor apparatus to obtain a sensing image, and all or part of information in this sensing image and the first threshold value are compared, to find out a comparison scope (as shown in step S902); Produce the second threshold value (as shown in step S904) according to the image information in this comparison scope; And image information and the second threshold value in more above-mentioned comparison scope, in order to capture the object image (as shown in step S906) of indicant.
In sum, optical touch control system of the present invention is to utilize two different threshold values to find out the object image of multiple indicants (being actual imaging scope).In actual mode of operation, treatment circuit first utilizes the first threshold value to find out the summary areas imaging of multiple indicants in the image sensing window of Image sensor apparatus, and this summary areas imaging is the comparison scope that need to further compare.Then, treatment circuit produces the second threshold value according to the image information in aforementioned comparison scope again, so that the image information in comparison of aforementioned comparison scope and the second threshold value, and then capture the object image of these indicants, namely find out the actual imaging scope of these indicants.Thus, just can further calculate according to actual imaging scope the coordinate of above-mentioned these indicants.
Therefore,, as long as the design of the size of above-mentioned the second threshold value suitably, treatment circuit just can be found out the object image of these indicants exactly so, and then calculates the actual coordinate of these indicants.
The above, only embodiments of the invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with embodiment, but not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the technology contents of above-mentioned announcement to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be not depart from technical solution of the present invention content, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (18)
1. an object image capture device, for optical touch control system, in order to capture the object image of this indicant in the time that touch-control surface of an indicant and this optical touch control system is interactive, is characterized in that comprising:
An Image sensor apparatus in order to this touch-control surface image of sensing; And
A treatment circuit, couple this Image sensor apparatus, in order in the time that this indicant is close to this touch-control surface, this treatment circuit is obtained a sensing image by this Image sensor apparatus, and the information in this sensing image and first threshold value are compared, to find out a comparison scope of the information in this sensing image, and produce second threshold value according to the image information in this comparison scope, the relatively image information in this comparison scope and this second threshold value, the image information that is less than this second threshold value to capture in this comparison scope obtains the object image of this indicant.
2. object image capture device according to claim 1, it is characterized in that: this treatment circuit is in order to compare all or part of information in this sensing image and first threshold value, to find out a comparison scope, wherein all or part of information in this sensing image comprises that this treatment circuit obtains the brightness value of N in every row pixel of this sensing image bright pixel, and calculate average brightness or the brightness total value of the bright pixel of N selected in every row pixel, and then first intensity map forming, wherein N is natural number.
3. object image capture device according to claim 2, is characterized in that: the scope that this comparison scope contains lower than all row information of this first threshold value for brightness value in this first intensity map.
4. object image capture device according to claim 1, it is characterized in that: this first threshold value is obtained according to one first default number percent from obtained second intensity map of background video by this treatment circuit, this background video is that this treatment circuit is before contiguous this touch-control surface of this indicant, first by this this touch-control surface of Image sensor apparatus sensing, thereby the image that does not contain this indicant of obtaining in advance, and this second intensity map to be this treatment circuit obtain by average brightness or the brightness total value of calculating N selected in every row pixel of this background video bright pixel.
5. object image capture device according to claim 4, is characterized in that: this treatment circuit is recently to obtain this second threshold value from this second intensity map according to one second default percentage.
6. object image capture device according to claim 2, it is characterized in that: this treatment circuit is obtained a minimum point from the segment of curve corresponding to this comparison scope of this first intensity map, and obtain this second threshold value taking the brightness value of this minimum point as benchmark increases by a predetermined luminance again.
7. object image capture device according to claim 1, is characterized in that: this object image that obtains this indicant comprises that the image information that is less than this second threshold value in this comparison scope of acquisition is as this object image.
8. object image capture device according to claim 1, it is characterized in that: this object capture device further comprises an infrared illumination device and the infrared ray filtering apparatus that can only allow infrared ray pass through, and this Image sensor apparatus is the image of obtaining this touch-control surface by this infrared ray filtering apparatus.
9. object image capture device according to claim 1, is characterized in that: this second threshold value is at this first threshold value and compare corresponding to this between minimum point of segment of curve of scope.
10. one kind captures the method for the object image of indicant, be applicable to optical touch control system, this optical touch control system includes a touch-control surface and an Image sensor apparatus in order to this touch-control surface image of sensing, it is characterized in that the method comprises the following steps:
In the time of contiguous this touch-control surface of an indicant, utilize this Image sensor apparatus to obtain a sensing image, and the information in this sensing image and first threshold value are compared, to find out a comparison scope of the information in this sensing image;
Produce second threshold value according to the image information in this comparison scope; And
The relatively image information in this comparison scope and this second threshold value, the image information that is less than this second threshold value to capture in this comparison scope obtains the object image of this indicant.
11. methods according to claim 10, it is characterized in that: all or part of information in this sensing image and first threshold value are compared, to find out a comparison scope, wherein, all or part of information in this sensing image comprises the brightness value of N in the every row pixel by obtaining this sensing image bright pixel, and calculate average brightness or the brightness total value of the bright pixel of N selected in every row pixel, and then one first intensity map forming, wherein N is natural number.
12. methods according to claim 11, is characterized in that: the scope that this comparison scope contains lower than all row information of this first threshold value for brightness value in this first intensity map.
13. methods according to claim 10, it is characterized in that: this first threshold value is to obtain according to one first default number percent by obtained second intensity map of background video, this background video is before contiguous this touch-control surface of this indicant, first by this this touch-control surface of Image sensor apparatus sensing, thereby obtain in advance not containing the image of this indicant, and average brightness or brightness total value that this second intensity map is selected in the every row pixel by calculating this background video N bright pixel obtain.
14. methods according to claim 13, is characterized in that: this second threshold value is to obtain according to one second default number percent by this second intensity map.
15. methods according to claim 11, it is characterized in that: from the segment of curve corresponding to this comparison scope of this first intensity map, obtain a minimum point, and obtain this second threshold value taking the brightness value of this minimum point as benchmark increases a predetermined luminance again.
16. methods according to claim 10, is characterized in that: this object image that obtains this indicant comprises that the image information that is less than this second threshold value in this comparison scope of acquisition is as this object image.
17. methods according to claim 10, is characterized in that: this sensing image is the sensing image that comprises infrared ray monochrome information.
18. methods according to claim 10, is characterized in that: this second threshold value is at this first threshold value and compare corresponding to this between minimum point of segment of curve of scope.
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| CN201010208454.XA CN102298468B (en) | 2010-06-24 | 2010-06-24 | Article image capture device and method for capturing article image of referent article |
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| CN201010208454.XA CN102298468B (en) | 2010-06-24 | 2010-06-24 | Article image capture device and method for capturing article image of referent article |
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