Mainly include infrared type at present, the common touch screen
, resistive, surface acoustic wave type, capacitance type, however, these types of large screen products, especially for large screen touch screen there are expensive, poor universality, poor stability, poor accuracy problem.
Now implements a virtual touch screen system based on camera, changed the traditional touch screen technology, it is composed of multiple cameras finger movement and click in the virtual touch screen operation, region segmentation out images taken from the hands, and then extract the edge of the finger, the finger contour fourth control points of b-spline curves is defined as the finger position, from two-dimensional coordinate projective transformation formula to obtain the position of the finger on the screen coordinates.
The nature of technical solution is to use multiple cameras will fingers and touch screen 3 d image into multiple 2 d image, and then from these two-dimensional images to identify the fingers, the movement of the fingers, click action, etc.
Because images must include the screen, so the cameras must be placed in the front of the display screen, there must be human shelter for large screen monitor can't identify the fingers.
In this paper, the design of virtual touch screen system consists of one dimensional image acquisition device to collect the finger of one dimensional data on the virtual touch screen, by multiple one-dimensional data to identify the location of the fingers in 2 d virtual touch screen coordinates, to complete the human-computer interaction.
System overview of virtual touch screen system consists of at least two of the one dimensional image acquisition device, display and data processing device.
One dimensional image acquisition device Settings around the perimeter of the virtual touch screen, each one dimensional image acquisition device to obtain the one dimensional image of surface and virtual touch screen in the same plane;
Virtual touch screen and the display of exactly the same shape and size, is in the same plane, virtual touch screen and display screen or in virtual touch screen directly in front of the display screen and parallel to the display screen;
Multiple one-dimensional image acquisition device to the position of the finger on the virtual touch screen and click action into multiple points and the points of the presence of one dimensional images, data processing equipment is based on a one dimensional midpoint image information recognition finger in two dimensional rectangular coordinates of virtual touch screen, and perform the corresponding operation, complete the human-computer interaction function.
It has simple structure, easy to implement, low cost, and solved using image technology to realize the common problems of human body obscured the finger touch screen, especially suitable for large touch screen system.
One dimensional image acquisition device using one dimensional linear sensor, cooperate to set the camera, signal conversion and interface circuit implementation;
Or by using two dimensional image acquisition device camera to camera to a line or a column in the two dimensional image of image data as required for one dimensional image data.
Compared with the existing technology, the advantages of this design is embodied in: (
Image acquisition device is set up around the perimeter of the virtual touch screen, the shooting direction parallel to the virtual touch screen, fundamentally solve the body block cause fingers cannot identify problems, especially because it avoids the problem of the human body keep out, thus it can be extended to any large screen projection screen, the common wall etc, good generality.
Just for one dimensional image data processing, compared with the two-dimensional image data processing, the process is greatly simplified, simple algorithm.
Using one dimensional linear sensor, cooperate to set the camera, signal conversion and interface circuit, its configuration is simple and cheap.
Also can be used in a two dimensional image acquisition device camera, with a line or a column in the two dimensional image of image data as required for one dimensional image data, easy to implement.
Usually just use two image acquisition device.
Use two or more image acquisition device can reduce the distance between the image acquisition device and display, for larger screens, we can make the system more compact.
Principle because the camera is cheap and easy to get, then the system structure of one dimensional image acquisition device replacement by camera, taken by the two-dimensional image of the one dimensional image data to identify the two-dimensional display screen coordinates.
Vertical, because the camera lens and the virtual touch screen when users of finger touch, finger motion of plane parallel to the virtual touch screen, so the fingers in virtual touch screen trajectory has been displayed in the camera images taken by a certain line.
Fingers in 2 d screen plane movement, converted into two fingers point in the camera image of the movement of the straight line one.
Camera around the two images of straight line points and 2 d display screen there is a one-to-one relationship at some point in the plane.
Problem is converted into according to the two images in the finger points to determine the location of the user mobile line the fingers of the points on the two-dimensional plane coordinates.
Its essence from two one-dimensional coordinate points and some initial Angle value to determine the point in two-dimensional plane coordinates.
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