Method and circuitry for exposure compensation applied to high dynamic range video

A circuitry for exposure compensation applied to a high dynamic range (HDR) video, the circuitry being disposed in an image-acquisition device, comprising:

• a control circuit used to control operations of an image signal processor and an image sensor of the image-acquisition device, performing a method for exposure compensation applied to a high dynamic range video including:
• receiving a video, and retrieving pixel values of each frame of sequential frames of the video;
• obtaining an instant exposure value ratio, in units of a row of one of the frames, between two frames of the sequential frames by comparing sums of row pixel values of two of the sequential frames;
• using a fixed adjustment ratio to control the image signal processor and the image sensor according to a processor exposure value ratio of the image signal processor for acquiring an exposure value ratio for each frame of the sequential frames in real time, wherein the fixed adjustment ratio is used as a fixed ratio to fine-tune the exposure value ratio for each frame so as to control each frame to have a same error, and the instant exposure value ratio of a first row of one of the frames is used as the processor exposure value ratio to be inputted to the image signal processor;
• and
• using the exposure value ratio for each frame of the sequential frames to perform exposure compensation for generating sequential frames undergone a high dynamic range compensation process so as to output an HDR video.