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Correcting method of multiple projector display wall colors of arbitrary smooth curve screens independent of geometric correction

A curved screen and multi-projector technology, which is applied in the direction of using projection device image reproducer, color signal processing circuit, picture duplicator, etc., can solve the problem of not being able to better adapt to any smooth curved projection screen, slow correction speed, Relying on geometric correction and other issues to achieve the effect of real-time correction of calculation speed

Active Publication Date: 2010-01-06
WISESOFT CO LTD
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Problems solved by technology

[0004] However, current color correction methods cannot well adapt to arbitrarily smooth curved projection screens and rely too much on the results of geometric correction
At the same time, since the color correction method based on linear CCD camera measurement needs to take a large number of images, its correction speed is relatively slow

Method used

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  • Correcting method of multiple projector display wall colors of arbitrary smooth curve screens independent of geometric correction
  • Correcting method of multiple projector display wall colors of arbitrary smooth curve screens independent of geometric correction
  • Correcting method of multiple projector display wall colors of arbitrary smooth curve screens independent of geometric correction

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Embodiment Construction

[0053] According to the method proposed by the present invention, first use the image alignment algorithm to obtain the corresponding relationship between the projector image and the camera image, and then take four sets of projection images of the projector images under different inputs in the three channels of RGB, and then use the image alignment The relationship and shooting results calculate the color information of each pixel of the projector, and finally combine all the calculation results to obtain the common brightness response range of the projector, and adjust the input through the GPU in real time to achieve the effect of color consistency correction.

[0054] In the establishment of the image alignment relationship, the steps mentioned above are adopted. The schematic diagram of the image alignment process based on subdivision grid encryption is shown in figure 2 As shown, its subdivision encryption algorithm is described as follows:

[0055] Any grid on a rectan...

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Abstract

The invention relates to a correcting method of multiple projector display wall colors of arbitrary smooth curve screens independent of geometric correction, which belongs to the image display processing of a computer system. The method comprises the following steps: firstly, obtaining a corresponding relation between a projector image and a camera image by utilizing an image alignment algorithm; secondly, shooting four sets of projection images of the projector image in three channels of RGB under different inputs; thirdly, calculating the color information of each pixel of a projector by utilizing an image alignment relation and a shooting result; and finally, combining all calculating results to obtain a projector common lightness response region and realizing a color consistency correction effect by adjusting inputs in real time by GPU. The correcting method is separated from geometric correction results, establishes the pixel level alignment relation between the projector image and the CCD camera image by utilizing the self-adaptive image alignment algorithm, can measure the lightness information of each pixel of the projector and adapt to arbitrary smooth projection screens. The alignment algorithm does not need any projectors, cameras and screen curve parameter calibrations and has the characteristics of simplicity, stability, self-adaptation and high speed.

Description

technical field [0001] The invention relates to image display processing of a computer system, in particular to a color correction method of a multi-channel projection display wall system. Background technique [0002] With the increasing demand for ultra-large screens and high-resolution displays in fields such as business, entertainment, and scientific research, multi-projection display wall technology has become a research hotspot that has attracted much attention. Due to performance differences between different projectors and performance differences between different areas within the same projector, multi-projector display walls cannot project a visually consistent complete picture even in the case of precise geometric alignment. Therefore, "color correction technology" plays a vital role in the process of building a "multi-projector display wall". [0003] In the past ten years, many scholars have done a lot of research on the problem of multi-projector splicing displ...

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Application Information

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IPC IPC(8): H04N9/64H04N9/31
CPCH04N9/3147H04N9/3182
Inventor 张军王邦平李晓峰
Owner WISESOFT CO LTD
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