Automatic tracking projection method and device based on frame difference value
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A projection device and automatic tracking technology, which is applied in the direction of using the image reproducer of the projection device, the parts of the color TV, the image data processing, etc. User experience, avoid direct eye effects
Inactive Publication Date: 2020-02-07
CHENGDU XGIMI TECH CO LTD
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[0003] Under the front projection condition of the existing projector, for the speaker using the projector, the light projected by the projector directly hits the eyes, which greatly affects the performance of the speaker. At the same time, it is difficult for the speaker to block the information behind the speaker. Therefore, it is very important to design a projection method and device that can automatically adjust the projection display area according to the speaker or user's position information so that the speaker or user is not in the projection screen
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Embodiment 1
[0031] like figure 1 As shown, this embodiment provides an automatic tracking projection method based on frame difference, which is used for a projection device provided with a camera, including:
[0032] Step S1: pre-judging the projected image by the camera in the camera space, if the frame difference is greater than the preset threshold M, proceed to the next step, otherwise, continue to perform the frame difference on the projected image by the camera in the camera space prejudging the action;
[0033] Step S2: obtaining the projection image outputted by the projection device on the optomechanical space in the optomechanical space, and at the same time, obtaining the projection image on the projection surface through the camera in the camera space;
[0034] Step S3: affine transformation of the projection image output by the projection device in the optical-mechanical space to the optical-mechanical space to the camera space, and in the camera space, compare the projectio...
Embodiment 2
[0047] like figure 2 As shown, this embodiment provides a display area automatic tracking projection device based on frame difference value, which can use the projection method provided in Embodiment 1 for projection, including a camera and an optomechanical system, and also includes:
[0048] Frame difference calculation unit: used to perform frame difference calculation on the projection picture captured by the camera and send the calculation result information to the frame difference judgment unit;
[0049] Frame difference judging unit: used to receive the frame difference calculation result information sent by the frame difference calculation unit and compare the frame difference calculation result with the preset threshold M, and then send the comparison result information to the optical-mechanical projection screen acquisition unit ;
[0050] Optical-mechanical projection screen acquisition unit: used to receive the comparison result information sent by the frame diff...
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Abstract
The invention discloses an automatic tracking projection method based on a frame difference value. The method comprises the following steps: performing frame difference value pre-judgment on a projection picture through a camera; acquiring a projection picture output to the ray machine by the projection device in the ray machine space, and acquiring the projection picture on the projection surfacethrough the camera at the same moment; carrying out affine transformation on a projection picture output to an optical machine by a projection device in an optical machine space to a camera space, and in the camera space, comparing the projection picture on the optical machine with a projection picture on a projection surface to obtain a pixel range of a shielding object in the camera space; carrying out inverse affine transformation on the pixel range of the shielding object to an optical machine space; and performing trapezoidal correction on the projection picture according to the pixel range of the shielding object in the optical-mechanical space, so that the shielding object is located outside the projection picture area. According to the invention, the light directly projected by the projector can be prevented from directly irradiating the eyes, the user experience is improved, and meanwhile, a viewer can continuously view the content explained by a speaker.
Description
technical field [0001] The invention relates to the field of projection control, in particular to an automatic tracking projection method and device based on frame difference values. Background technique [0002] Projector, also known as projector, is a device that can project images or videos onto a screen. It can be connected to a computer, DV, etc. through different interfaces to play corresponding video signals. Projectors are currently widely used in homes, offices, Schools and entertainment venues have different types such as CRT, LCD, DLP, etc., according to different working methods. [0003] Under the condition of front projection of the existing projector, for the speaker who uses the projector, the light projected by the projector directly hits the eyes, which greatly affects the performance of the speaker. At the same time, the information behind the speaker is not easy to be viewed. Therefore, it is very important to design a projection method and apparatus tha...
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