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Multi-touch-point recognition method and device

A multi-touch point and recognition method technology, applied in the field of computer vision, can solve the problems of increasing design difficulty and hardware cost, and achieve the effect of avoiding design difficulty and cost increase and good application prospects

Inactive Publication Date: 2013-06-12
GUANGDONG VTRON TECH CO LTD
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Problems solved by technology

But this method not only increases the hardware cost, but also increases the difficulty of design

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  • Multi-touch-point recognition method and device

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Embodiment Construction

[0023] The present invention provides a multi-touch point recognition method and device, which can solve the problem of increasing the cost and design difficulty caused by the need to increase the cost and design difficulty of an auxiliary camera when positioning multiple touch points on a display screen in the prior art. The embodiment of the present invention will be described in detail in conjunction with the drawings when there are two touch points on the screen.

[0024] A multi-touch point recognition method, such as figure 2 shown, including the following steps:

[0025] In step S1, the two cameras collect one frame of images respectively, and calculate the image position information and horizontal size information of the touch object in the two images respectively.

[0026] In this embodiment, the two cameras are respectively installed at the lower left corner and the lower right corner of the flat screen, and both adopt 90° optical lenses.

[0027] Preferably, afte...

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Abstract

The present invention provides a multi-touch point recognition method and device. The method includes the following steps: two cameras respectively collect a frame of images, and respectively calculate the image position information and lateral size information of the touch object in the two images; The image position information calculates the angle between the touch object and the line between the two cameras, and calculates the intersection coordinates of all the lines from the touch object to the two cameras according to the angle between the touch object and the line between the two cameras; Determine a camera, calculate the distance from the intersection of all connected lines to the camera, and calculate the ratio between the distances; calculate the ratio between the horizontal size of each touch object image collected by the selected camera and use it as a reference value; The ratio between the distances is compared with the reference value to determine the real touch point. The method and device of the present invention effectively avoid the problems of increased cost and increased design difficulty caused by adding auxiliary cameras.

Description

technical field [0001] The invention relates to the field of computer vision, in particular to a multi-touch point recognition method and device based on camera positioning. Background technique [0002] In recent years, large-scale liquid crystal displays have been widely used in the large-scale human-computer interaction display industry. The touch technology of the flat panel includes infrared LED scanning positioning and ultrasonic positioning, and the use of two cameras installed at the corners of the screen, and the use of optical path cross positioning, etc. Among them, the positioning method with two cameras installed at the corners of the screen has gradually been widely used due to its high positioning accuracy and ability to quickly capture and calculate the coordinates of touch points. [0003] Such as figure 1 As shown, taking the flat-panel display as an example, camera A and camera B are respectively installed on the two corners of the flat-panel display. Whe...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042
Inventor 郑金发
Owner GUANGDONG VTRON TECH CO LTD
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