Color correction method of multi-projector display system

Abstract

The invention discloses a color correction method of a multi-projector display system. The color correction method of the multi-projector display system is characterized by comprising the following steps: (1) switching is conducted between a color space for imaging of a camera and a color space input by projectors, a red green blue (RGB) color space is switched to a YUV color space; (2) the camera is calibrated so as to obtain a vignetting function and a nonlinear response function of the camera; (3) the projectors of the multi-projector display system are calibrated according to the calibrated camera, a nonlinear response function of each projector of the multi-projector display system is obtained, and black excursion distribution and maximum brightness distribution of each projector are obtained according to the calibrated camera; and (4) a public response function, public black excursion distribution and public maximum brightness distribution of the whole multi-projector display system are obtained through calculation, a correction template is obtained, a color checking chart is generated, projected images are corrected by utilizing the color checking chart, and the corrected projected images are projected on a projecting screen by each projector of the multi-projector display system. The method can solve the problem that the lightness of the multi-projector display system is inconsistent, lightness correction of main stream projectors such as a liquid crystal display (LCD) and a digital light processor (DLP) is supported, and the dynamic range of projected contents is improved as far as possible.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a color correction method for a multi-projector display system. Background technique [0002] As DLP projectors become one of the mainstream projectors in the market, the correction method based on three channels is no longer applicable. In the traditional correction method, the edge blending method only considers the color inconsistency in the overlapping area of ​​multiple projectors. The gamut matching method achieves strict color consistency between different projectors, but ignores color inconsistencies within a single projector. Recently, some color consistency correction methods based on the projector-camera system at home and abroad have achieved the color consistency of the entire system. However, strict color consistency severely compresses the brightness dynamic range of the final image and damages the image quality. Moreover, only the nonlinear ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a color correction method for a multi-projector display system, which solves the problem of inconsistency in the brightness of a multi-projector display system in the prior art, and supports the brightness correction of mainstream projectors such as LCD and DLP at the same time, taking into account The widely overlooked camera vignetting effect handles black shifting to maximize the dynamic range of projected content while ensuring consistent brightness

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