Double exposure implementation method for inhomogeneous illumination image

Abstract

The invention discloses a double exposure implementation method for an inhomogeneous illumination image. The double exposure implementation method for the inhomogeneous illumination image comprises the following steps: obtaining an illumination image; obtaining a reflection image; overlaying the illumination image with the reflection image to obtain the global enhancement effect; fusing the global enhancement effect with the original image; and carrying out color correction on an enhancement result to obtain a visual matching image. According to the double exposure implementation method for the inhomogeneous illumination image, which is disclosed by the invention, the smooth property of the illumination image is constrained, and the reflection image is sharpened by the visual threshold value characteristic to guarantee the detail information of the image; with an image fusion method, the luminance, the contrast ratio and the color information of an original image luminance range can be effectively kept; because the characteristic of the human eye visual perception of average background brightness is introduced in, the fused image can be used for effectively eliminating image color distortion near a shadow boundary; the color of a low-illuminance zone is restored by the color correction technology; the colors of the low-illuminance zone and the luminance range are free from obvious distortion; the continuity is good; and the visual effect is more nature.

Description

technical field [0001] The invention belongs to the technical field of secondary exposure of images, and in particular relates to a method for realizing secondary exposure of images with non-uniform illumination. Background technique [0002] At present, wide dynamic technology mainly uses special DSP (digital signal processing) circuits to expose the bright part with the most suitable shutter speed, and then expose the dark part with the most suitable shutter speed, and then recombine the two images through DSP processing , so that the bright part and the dark part can be seen clearly, which requires high technology to minimize the loss of color and clarity. However, due to the limitation of the characteristics of CCD, the wide dynamic range of the camera can reach 60dB at most, so even if the most advanced Advanced wide dynamic technology cameras will still obtain non-uniform illumination images under complex lighting conditions, resulting in the problem that the obtained ...

AI Technical Summary

Problems solved by technology

[0019] The purpose of the embodiments of the present invention is to provide a method for realizing the secondary exposure of non-uniform illumination images, which aims to solve the problem of smoothing the details of the image, especially when the color distortion of the image is more obvious near the shadow boundary; the bright area of ​​the enhancement result The brightness, contrast, and chromaticity information in the luminance area are changed, but such information in the bright area itself satisfies the "visual matching" feature, and the change will affect the visual effect; although the brightness of the low-illuminance area can be effectively improved, the visual effect of the color information Unnatural; parameters α and β have a great influence on the enhancement results, and it is difficult to set them in actual use, which leads to the problem of decreased robustness of the algorithm

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