CN102520869B - Automatic parameter adjusting method for imaging touch screen of camera - Google Patents
Automatic parameter adjusting method for imaging touch screen of camera Download PDFInfo
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- CN102520869B CN102520869B CN2011104372781A CN201110437278A CN102520869B CN 102520869 B CN102520869 B CN 102520869B CN 2011104372781 A CN2011104372781 A CN 2011104372781A CN 201110437278 A CN201110437278 A CN 201110437278A CN 102520869 B CN102520869 B CN 102520869B
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Abstract
The invention belongs to the field of touch screens, in particular to an automatic parameter adjusting method for an imaging touch screen of a camera, which includes the following steps that a data storage in the touch screen stores a touch screen parameter threshold, the touch screen is started and initialized, the touch screen parameter threshold in the data storage is read to a computer internal memory of the touch screen, the touch screen detects touch points and obtains images and pixel values of the touch points, the pixel values of the touch point images are compared with the touch screen parameter to obtain effective touch point pixel point and calculate moving speed of the touch points, the touch screen threshold parameter in the computer internal memory is adjusted according to the number of effective touch point pixel points and the moving speed of the touch points, and the adjusted touch screen threshold parameter is applied to detect and calculate new touch points in the touch screen. The automatic parameter adjusting method is capable of automatically adjusting camera gain and the brightness threshold of different areas of the touch screen, improves application effect of the touch screen and shortens manual equipment debugging time.
Description
Technical field
The invention belongs to the touch-screen field, be specifically related to a kind of automatic parameter adjusting method for imaging touch screen of camera.
Background technology
In imaging touch screen of camera, need to set for the camera gain of photographic images with for screening the parameters such as luminance threshold of touch point image, generally that manufacturer finds the parameter value that meets application demand to be solidificated in equipment by experiment, perhaps in project installation personnel Installation and Debugging process at the scene, manual debugging meets the parameter value of application demand and is solidificated in equipment, uncertainty due to camera manufacturing variation and applied environment, the equipment that adopts same set of parameter value be difficult to allow to be installed on various scenes reaches best effect, field erected engineering staff debugs the touch-screen parameter simultaneously also needs to expend longer man-hour.And owing to being provided with convex lens in camera, convex lens make light draw close toward center, if therefore adopt a global gain and a fixing luminance threshold, the brightness of image difference that the luminophor of same brightness obtains in each zone of camera, generally that middle mind-set surrounding is successively decreased, its characteristics that show are, after the filtration of luminance threshold, the central area of touch-screen and peripheral regions contrast, the pixel that surpasses luminance threshold that central area obtains is compared the many of peripheral regions, and the pixel that surpasses luminance threshold in central area is relatively continuous, distribution may appear being interrupted in the pixel that peripheral regions surpasses luminance threshold, the relatively continuous image that surpasses luminance threshold easily calculates its barycentric coordinates point, the discontinuous pixel that surpasses luminance threshold can cause calculating a plurality of barycentric coordinates points, produce error coordinates, cause the touch-screen on touch-screen is judged by accident, the effect of touch-screen and user's experience have been affected.
Summary of the invention
The technical matters that the present invention solves is to overcome the deficiencies in the prior art, a kind of on-line automatic adjustment camera gain and touch-screen zones of different luminance threshold are provided, improve the effect of touch-screen, and shorten the automatic parameter adjusting method for imaging touch screen of camera of manual debugging equipment time.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of automatic parameter adjusting method for imaging touch screen of camera, comprise the steps:
Data-carrier store in touch-screen stores the touch-screen parameter threshold;
Open touch-screen initialization touch-screen, the touch-screen parameter threshold in the reading out data storer is in the calculating internal memory of touch-screen;
Touch-screen detects touch point, obtains image and the pixel value thereof of described touch point;
Each pixel value of described touch point image and touch-screen parameter threshold are compared and obtain effective touch point pixel, and calculate described touch point translational speed;
With reference to effectively the touch-screen threshold parameter in internal memory is calculated in touch point pixel number, touch point translational speed adjustment;
Touch-screen threshold parameter after application is adjusted is detected and is calculated touch point new in touch-screen.
In such scheme, described touch-screen parameter threshold comprises touch-screen luminance threshold, touch point translational speed threshold value, pixel number threshold value.
In such scheme, described method also comprises described touch-screen is divided into to some zones, the corresponding luminance threshold in a zone of touch-screen;
When described touch point pixel brightness value is greater than luminance threshold corresponding to its region, described touch point pixel is effective touch point pixel.
In such scheme, the concrete steps that the touch-screen threshold parameter in internal memory is calculated in the effective touch point of described reference pixel number, touch point translational speed adjustment are as follows:
When described touch point translational speed is less than touch point translational speed threshold value, judge whether effective touch point pixel number is less than pixel number threshold value, if reduce luminance threshold corresponding to described pixel region, effective touch point, otherwise improve luminance threshold corresponding to described pixel region, effective touch point.
In such scheme, described touch-screen parameter threshold also comprises the camera global gain parameter.
In such scheme, described method also also comprises to be adjusted the camera global gain parameter, its specifically:
Set in advance the central area scope of touch-screen;
Calculate the barycentric coordinates of described touch point according to described effective touch point pixel;
When described touch point barycentric coordinates are positioned at the central area of touch-screen, judge that whether effective touch point pixel number is less than pixel number threshold value, if increase the camera global gain parameter, otherwise reduces the camera global gain parameter.
In such scheme, also comprise pixel number max-thresholds and minimum threshold in described touch-screen parameter threshold, when described effective touch point pixel number is greater than pixel number max-thresholds or is less than pixel number minimum threshold, do not carry out the adjustment of luminance threshold corresponding to pixel region, effective touch point.
In such scheme, also comprise pixel number max-thresholds and minimum threshold in described touch-screen parameter threshold, when described effective touch point pixel number is greater than pixel number max-thresholds or is less than pixel number minimum threshold, do not carry out the adjustment of camera global gain parameter.
Compared with prior art, the beneficial effect of technical solution of the present invention is:
The present invention arranges different luminance thresholds to the touch-screen zones of different, improve accuracy and the reliability of touch-screen parameter by the automatic adjustment of the automatic adjustment to luminance threshold and camera global gain parameter, the pixel of avoiding the touch-screen peripheral regions to occur is interrupted distribution situation, improve the accuracy rate that the touch point coordinate calculates, effectively improve the effect of touch-screen, and can save on-the-spot manual debugging when touch-screen is installed, shorten debug time.
The accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
The distribution plan that Fig. 2 is the corresponding touch-screen regional of touch-screen luminance threshold in the present invention.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described further.
Be illustrated in figure 1 the process flow diagram of a kind of automatic parameter adjusting method for imaging touch screen of camera in the present invention, described method comprises the steps:
(S1) data-carrier store in touch-screen stores the touch-screen parameter threshold; The touch-screen parameter threshold comprises: the touch-screen luminance threshold, touch point translational speed threshold value, pixel number threshold value, pixel number max-thresholds and pixel number minimum threshold, the camera global gain parameter, wherein, pixel number max-thresholds > pixel number threshold value > pixel number minimum threshold; Simultaneously, in advance touch-screen is divided into to some zones and sets the central area scope of touch-screen, the corresponding luminance threshold in a zone of touch-screen, as shown in Figure 2, it meets the feature of successively decreasing to peripheral regions from the touch screen center zone to the distribution plan of the corresponding touch-screen regional of touch-screen luminance threshold.
(S2) open touch-screen initialization touch-screen, the touch-screen parameter threshold in the reading out data storer is in the calculating internal memory of touch-screen; Camera global gain wherein is for the camera photographic images, and the touch-screen luminance threshold is for the effective touch point pixel of screening touch-screen regional after camera photographs the touch point image.
(S3) touch-screen detects touch point, obtains image and the pixel value thereof of described touch point; To produce the touch point image by camera when user's point touching shields, obtain each pixel value on this touch point image and this touch point image.
(S4) each pixel value on the image of touch point and touch-screen parameter threshold are compared and obtain effective touch point pixel, and calculate the barycentric coordinates of described touch point translational speed and touch point; When the pixel brightness value on the image of touch point is greater than luminance threshold corresponding to its region, the pixel on this touch point image is effective touch point pixel.Calculating the effective pixel points number and the touch point translational speed that form touch point is to be to carry out the adjustment of parameter threshold while in touch point, resting on touch area in order to ensure the touch-screen parameter threshold, improves the accuracy of parameter adjustment.
(S5) calculate the touch-screen threshold parameter in internal memory with reference to the barycentric coordinates adjustment of effective touch point pixel number, touch point translational speed, touch point; It specifically comprises the steps:
(S51) the touch-screen luminance threshold is adjusted, its specifically:
(S511) when the touch point translational speed is less than touch point translational speed threshold value, judge whether effective touch point pixel number is less than pixel number threshold value, if the step of entering (S512), otherwise enter step (S513);
(S512) judge whether effective touch point pixel number is less than pixel number minimum threshold, if do not carry out the adjustment of luminance threshold corresponding to pixel region, effective touch point, otherwise reduce this luminance threshold corresponding to pixel region, effective touch point;
(S513) judge whether effective touch point pixel number is less than pixel number max-thresholds, if do not carry out the adjustment of luminance threshold corresponding to pixel region, effective touch point, otherwise improve luminance threshold corresponding to pixel region, effective touch point.
(S52) the camera global gain parameter is adjusted, its specifically:
(S521) when described touch point barycentric coordinates are positioned at the central area of touch-screen, judge whether effective touch point pixel number is less than pixel number threshold value, if the step of entering (S522), otherwise enter step (S523);
(S512) judge whether effective touch point pixel number is less than pixel number minimum threshold, if do not carry out the adjustment of camera global gain parameter, otherwise increase the camera global gain parameter;
(S513) judge that whether effective touch point pixel number is less than pixel number max-thresholds, if do not carry out the adjustment of camera global gain parameter, otherwise reduces the camera global gain parameter.
(S6) the touch-screen threshold parameter after the application adjustment is detected and is calculated touch point new in touch-screen.
Claims (6)
1. an automatic parameter adjusting method for imaging touch screen of camera, is characterized in that, comprises the steps:
Data-carrier store in touch-screen stores the touch-screen parameter threshold;
Open touch-screen initialization touch-screen, the touch-screen parameter threshold in the reading out data storer is in the calculating internal memory of touch-screen;
Touch-screen detects touch point, obtains image and the pixel value thereof of described touch point;
Each pixel value of described touch point image and touch-screen parameter threshold are compared and obtain effective touch point pixel, and calculate described touch point translational speed;
With reference to effectively the touch-screen threshold parameter in internal memory is calculated in touch point pixel number, touch point translational speed adjustment;
Touch-screen threshold parameter after application is adjusted is detected and is calculated touch point new in touch-screen;
Described touch-screen parameter threshold comprises touch-screen luminance threshold, touch point translational speed threshold value, pixel number threshold value;
Described method also comprises described touch-screen is divided into to some zones, the corresponding luminance threshold in a zone of touch-screen;
When described touch point pixel brightness value is greater than luminance threshold corresponding to its region, described touch point pixel is effective touch point pixel.
2. automatic parameter adjusting method for imaging touch screen of camera according to claim 1, is characterized in that, the concrete steps that the touch-screen threshold parameter in internal memory is calculated in the effective touch point of described reference pixel number, touch point translational speed adjustment are as follows:
When described touch point translational speed is less than touch point translational speed threshold value, judge whether effective touch point pixel number is less than pixel number threshold value, if reduce luminance threshold corresponding to described pixel region, effective touch point, otherwise improve luminance threshold corresponding to described pixel region, effective touch point.
3. automatic parameter adjusting method for imaging touch screen of camera according to claim 2, is characterized in that, described touch-screen parameter threshold also comprises the camera global gain parameter.
4. automatic parameter adjusting method for imaging touch screen of camera according to claim 3, is characterized in that, described method also also comprises to be adjusted the camera global gain parameter, its specifically:
Set in advance the central area scope of touch-screen;
Calculate the barycentric coordinates of described touch point according to described effective touch point pixel;
When described touch point barycentric coordinates are positioned at the central area of touch-screen, judge that whether effective touch point pixel number is less than pixel number threshold value, if increase the camera global gain parameter, otherwise reduces the camera global gain parameter.
5. automatic parameter adjusting method for imaging touch screen of camera according to claim 2, it is characterized in that, also comprise pixel number max-thresholds and minimum threshold in described touch-screen parameter threshold, when described effective touch point pixel number is greater than pixel number max-thresholds or is less than pixel number minimum threshold, do not carry out the adjustment of luminance threshold corresponding to pixel region, effective touch point.
6. automatic parameter adjusting method for imaging touch screen of camera according to claim 4, it is characterized in that, also comprise pixel number max-thresholds and minimum threshold in described touch-screen parameter threshold, when described effective touch point pixel number is greater than pixel number max-thresholds or is less than pixel number minimum threshold, do not carry out the adjustment of camera global gain parameter.
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| CN101226447A (en) * | 2008-01-29 | 2008-07-23 | 广东威创视讯科技股份有限公司 | Touch screen device and debugging method thereof |
| CN101882028A (en) * | 2009-05-05 | 2010-11-10 | 联想(北京)有限公司 | Method for correcting optical touch screen and optical touch screen |
| CN102043541A (en) * | 2009-10-14 | 2011-05-04 | 谭登峰 | General optical touch screen |
| CN102265252A (en) * | 2011-06-24 | 2011-11-30 | 华为终端有限公司 | A method and a device for adjusting a sensing threshold value of an infrared proximity sensor |
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| US8030914B2 (en) * | 2008-12-29 | 2011-10-04 | Motorola Mobility, Inc. | Portable electronic device having self-calibrating proximity sensors |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101226447A (en) * | 2008-01-29 | 2008-07-23 | 广东威创视讯科技股份有限公司 | Touch screen device and debugging method thereof |
| CN101882028A (en) * | 2009-05-05 | 2010-11-10 | 联想(北京)有限公司 | Method for correcting optical touch screen and optical touch screen |
| CN102043541A (en) * | 2009-10-14 | 2011-05-04 | 谭登峰 | General optical touch screen |
| CN102265252A (en) * | 2011-06-24 | 2011-11-30 | 华为终端有限公司 | A method and a device for adjusting a sensing threshold value of an infrared proximity sensor |
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