Method and device for image taking brightness control and computer readable storage medium

摘要

Embodiments of the present disclosure provide a method for controlling the brightness of a shot image by controlling an exposure parameter used when the image is taken on the basis of the distribution condition of detail features comprised in each brightness class area of an image frame in a preview image frame. The method includes the operations of acquiring a preview image frame, and determining the brightness level n of each pixel in the preview image frame; dividing the preview image frame into M class areas according to the determined brightness level n of each pixel; determining an exposure adjustment level required when the preview image frame is taken according to the distribution condition of detail features comprised in each class area in the preview image frame; and adjusting a pre-acquired exposure parameter according to the determined exposure adjustment level, and taking an image according to the adjusted exposure parameter.

主权项

1. A method for image taking brightness control, comprising:
acquiring a preview image frame, and determining a brightness level n of each pixel in the preview image frame; dividing the preview image frame into M class areas according to the determined brightness level n of each pixel; calculating a feature weight for each class area in the preview image frame, wherein calculating includes, for any one of the class areas, calculating a detail feature value of each subarea in the class area, counting total detail feature values of all subareas in the class area, calculating a pixel ratio of a number of pixels in the class area to a total number of pixels of the preview image frame, and determining the feature weight of the class area in the preview image frame according to the calculated pixel ratio and the counted total detail feature values; for any one of the class areas, determining a ratio of the feature weight of the class area to the sum of the feature weights of all class areas as a feature weight ratio of the class area; determining an exposure adjustment level required when the preview image frame is taken according to the feature weight ratio of each class area; and adjusting a pre-acquired exposure parameter according to the determined exposure adjustment level, and taking an image according to the adjusted exposure parameter.