Regional projection color compensation method
A compensation method and area technology, applied in the field of projection color compensation, can solve the problems of large projection range, overlapping band fusion, complex system design, etc., to achieve the effect of reducing the amount of calculation
Pending Publication Date: 2022-07-01
COMMUNICATION UNIVERSITY OF CHINA
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Problems solved by technology
[0003] So far, all projection color compensation methods are color compensation for the entire image. Even if only a small piece of texture needs to be compensated in the entire projection range, it is necessary to calculate the compensation of the entire projection surface. When multi-projection splicing display The projection range is very large, which will cause the design of the whole system to be complex (overlapping bands require both color compensation and fusion) and a huge amount of calculation
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Embodiment 1
[0030] like figure 1 As shown, the regional projection color compensation method provided by the present invention comprises the following steps:
[0031] (1) Use computer vision method to analyze and process the collected images, determine the pixel-by-pixel correspondence between the projection space and the collection space, and establish the coordinate mapping of the corresponding pixel points.
[0032] (2) Use computer vision methods to analyze the projection surface to determine the area that needs to be compensated.
[0033] (3) Using the computer vision method and the image data collected by the camera, establish a color mapping relationship model between the projection color space and the acquisition color space.
[0034] (4) Using the mapping relationship between the projection color space and the compensation area of the acquisition color space and the mapping relationship between the projection color space and the non-compensation area of the acquisition color...
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The invention discloses a regional projection color compensation method, which comprises the following steps: acquiring an acquired image, and analyzing the acquired image based on a computer vision method to obtain a to-be-compensated region; acquiring a coordinate mapping relation and a color mapping relation between the projection color space and the acquisition color space; and performing color compensation on the to-be-compensated area based on the coordinate mapping relation and the color mapping relation to obtain an area compensation image. According to the method, by calculating the mapping relation between the projection color space and the collection color space and the mapping relation between the interior and the exterior of the compensation area, only two times of nonlinear data mapping are carried out on pixels in the area, the image in the area is subjected to color compensation with the exterior of the area as the background, and the visual abrupt sense caused by a small texture area is eliminated. The method is small in calculation amount, and a multi-projection display system is simple in design.
Description
technical field [0001] The invention belongs to the field of projection color compensation, in particular to a regional projection color compensation method. Background technique [0002] In order to solve the influence of textured surface on the projected image, Nayar et al. performed color compensation on the projected image by establishing the coupling relationship between the projector and each channel of the camera, and obtaining the color coupling matrix. This method needs to establish the brightness response curve of the RGB channel of the projector, but the color channel of the currently used DLP projector is not independent, so the brightness curve cannot be accurately obtained. Grundhofer et al. used color space sparse sampling and nonlinear data interpolation to obtain the color mapping relationship between the projector color space and the camera color space, and calculated the compensation image pixel by pixel according to the color mapping relationship. This me...
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Login to View More IPC IPC(8): H04N9/31
CPCH04N9/3182H04N9/3179H04N9/3147
Inventor 牛力丕施宗轩赵艳明李绍彬蒋伟
Owner COMMUNICATION UNIVERSITY OF CHINA