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Method, device and system of contact identification resisting infrared noise

An anti-infrared, contact technology, applied in the field of touch recognition, can solve the problem of low recognition of finger contacts, and achieve the effect of enhancing stability

Inactive Publication Date: 2013-05-15
武汉智慧城市研究院股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to provide a contact recognition method, device and system against infrared noise, aiming to solve the problem of low recognition of finger contacts in the existing FTIR technical solution when the infrared noise in the external environment is strong question

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  • Method, device and system of contact identification resisting infrared noise

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Embodiment 1

[0030] figure 1 The flowchart of the infrared noise resistant contact recognition method provided by the first embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0031] The anti-infrared noise contact identification method provided by this implementation includes:

[0032] Step S101 , acquiring two adjacent frames of images, one of which is a finger shadow image, and the other frame is a finger contact image.

[0033] When the camera is shooting video, it quickly records discontinuous images frame by frame according to a certain rhythm, and then uses the persistence of vision of the human eye to quickly play these images, so that the effect of continuous playback can be achieved. In this step, it is necessary to Control the light-emitting time of the infrared light source so that the infrared light source is synchronized with the image captured by the camera, and among...

Embodiment 2

[0041] figure 2 The flowchart of the infrared noise resistant contact recognition method provided by the second embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0042] The anti-infrared noise contact identification method provided by this implementation includes:

[0043] Step S201, acquiring two adjacent frames of images, one of which is a finger shadow image, and the other frame is a finger contact image;

[0044] Step S202, acquiring the gray value difference of each corresponding pixel of the two adjacent frames of images;

[0045] Step S203, counting the number of pixels in the difference greater than the preset pixel threshold;

[0046] Step S204, when the number of pixels is greater than the preset times threshold, it can be determined that the current image contains touch point information.

[0047] The above steps S201-S204 are the same as steps S101-S104 i...

Embodiment 3

[0053] Figure 5 A structural block diagram of the infrared noise resistant contact recognition device provided by the third embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0054] The anti-infrared noise contact identification device provided by this implementation includes:

[0055] An image acquisition unit 501, configured to acquire two adjacent frames of images, one of which is a finger shadow image, and the other frame is a finger contact image;

[0056] A difference value obtaining unit 502, configured to obtain the gray value difference of each corresponding pixel of the two adjacent frames of images;

[0057] A pixel counting unit 503, configured to count the number of pixels in the difference greater than a preset pixel threshold;

[0058] The touch point judging unit 504 is configured to determine that the current image contains touch point information wh...

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Abstract

The invention is suitable for the technical field of touching identification, and provides a method, a device and a system of contact identification resisting infrared noise. The method comprises obtaining two adjacent frames of images, one of the two frames of images is used as a finger shadow image, and the other of the two frames of images is used as a finger contact image; obtaining the difference value of the gray values of corresponding pixels of the two adjacent frames of images; counting the number of the pixels with values, greater than a preset pixel threshold value, of the difference value. And when the number of the pixels is greater than a threshold of a preset number of times, the current image can be judged to contain contact information. Compared with the prior art, the technical scheme of the method, the device and the system of contact identification resisting infrared noise introduces the finger shadow image. When the external ambient light is stronger, due to the fact that an infrared light source is closed, the finger shadow image is darker, and the gray values are smaller, so the difference value of the finger contact image and the finger shadow image is greater, the contact information is more beneficial to being recognized, and the capacity of resisting infrared interference of contact identification is improved.

Description

technical field [0001] The invention belongs to the technical field of touch recognition, and in particular relates to a contact recognition method, device and system against infrared noise. Background technique [0002] Human-computer interaction technology has become one of the key technologies in the fields of consumer electronics and industrial control. At the same time, the emergence of touch technology, especially multi-touch (Multi-Touch) technology has revolutionized the way of human-computer interaction. [0003] At present, multi-touch technology in small size has been widely used in consumer electronics products such as mobile phones and tablet computers. For example, projected capacitive touch technology is widely used in small In the control panel, there are still some problems in the multi-touch technology. For example, in the traditional infrared technology and the optical technology based on the camera, there are problems such as inaccurate contact recogniti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
Inventor 胡昱邹雪城李江晨韩君佩
Owner 武汉智慧城市研究院股份有限公司