Automatic exposure method based on color weighting

Abstract

The invention discloses an automatic exposure method based on color weighting. The method is used for achieving automatic exposure of images and improving the image display effect. Color feature values are extracted from acquired image data and are used for calculating image brightness indexes using different weights. The image brightness indexes are used for determining whether an image is in the best brightness area or not, and if not, exposure parameter adjustment is performed according to an adaptive adjustment step length for obtaining an accurately-exposed image. Exposed images with proper brightness and bright colors can be obtained for most of scenes, colors can be truly recovered when some color dominate a leading position in a scene, and accurate exposure is achieved.

Description

technical field [0001] The invention relates to the field of digital imaging, in particular to an automatic exposure method based on color weighting. Background technique [0002] With the rapid popularization of high-resolution cameras, users have higher and higher requirements for image quality. Accurately controlling the exposure of the camera has also become one of the key parameters to improve the final image quality. The camera’s light metering system is designed according to the 18% reflectance of the subject. For most scenes, the reflectance of the light and dark parts can be considered as 18%. Using the exposure combination provided by the camera after metering, you can get 18% after the synthesis. % gray tone photo, this is the normal tone in most cases. In fact, there is a specific relationship between the exposure measured by the camera's metering system and the color of the subject. Different colors have different reflective degrees. When the shooting picture...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an automatic exposure method based on color weighting, which solves the problem of color distortion caused by exposure when a certain color is dominant in the scene, and obtains more vivid colors while obtaining appropriate brightness

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