Method and device for adjusting image brightness

Abstract

The invention discloses a method and device for adjusting the brightness of an image. The method comprises: a black-and-white image and a color image in the same scene are obtained by using a black-and-white camera and a color camera; whether the color image is exposed excessively is determined; if not, region segmentation is carried out on the black-and-white image; the black-and-white image is processed by normalization and regions, obtained by region segmentation, of the black-and-white image are merged into a plurality of regional layers; the regional layers are divided into a bright region and a dark region; a sum of brightness differences between all regional layers in the dark region and corresponding regions in the color image is calculated to obtain a dark region brightness difference value, a sum of brightness differences between all regional layers in the bright region and corresponding regions in the color image is calculated to obtain a bright region brightness difference value; according to the dark region brightness difference value and the dark region brightness difference value, the brightness of the black-and-white image is adjusted; and the black-and-white image after brightness adjustment is fused with the color image. According to the invention, with brightness adjustment of the black-and-white image, a problem of color deviation of the fused image is solved.

Description

Technical field [0001] The present invention relates to the technical field of image processing, in particular to an image brightness adjustment method and device. Background technique [0002] With the rapid development of mobile phone camera functions in recent years, consumer demand for cameras with more powerful functions has gradually increased. Night scene is a commonly used shooting scene for users, and its effect is optimized, which can effectively improve the user experience of taking pictures of the camera. At present, the common night scene photographing method in the industry is: use a color camera (RGB) and a black and white camera (MONO) to take pictures separately, and enhance the night scene effect by fusing the images taken by the two cameras. [0003] When taking pictures, the brightness, detail, and noise of the black and white camera will be better than that of the color camera. Therefore, in the fusion process, the color camera is used to provide color, and th...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method and device for adjusting image brightness. By adjusting the brightness of a black-and-white image, the brightness of the black-and-white image is approached to the brightness of a color image, thereby solving the problem of color cast in the fusion image question

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