Exposure control method and device based on high dynamic range camera device

Abstract

The technical solution of the present invention discloses an exposure control method and device based on a high dynamic range camera device. The exposure control method includes: acquiring a short exposure image and a long exposure image based on a high dynamic range camera device; counting the short exposure image and the long exposure image respectively The histogram information of the exposure image and the sub-region brightness information; respectively obtain the adjustment influence value of the short exposure and the adjustment influence value of the long exposure, the adjustment influence value of the short exposure is related to the histogram information of the short exposure image and the sub-region brightness information, and the long exposure adjustment influence value is related to the histogram information of the short exposure image and the sub-region brightness information The adjustment influence value of the exposure is related to the histogram information of the long exposure image, the sub-region brightness information and the sub-region brightness information of the short exposure image; the short exposure adjustment is performed based on the adjustment influence value of the short exposure, and the long exposure is adjusted based on the adjustment influence value of the long exposure. Exposure adjustment: when the short exposure is stable, the long exposure is adjusted based on the ratio of the brightness evaluation value of the short exposure to the brightness evaluation value of the long exposure until the long exposure is stable.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an exposure control method and device based on a high dynamic range camera device. Background technique [0002] A high-dynamic range (HDR, High-Dynamic Range) camera adopts two different exposure methods to simultaneously perform exposure processing on the same scene to obtain long-exposure images and short-exposure images, and the one with a longer exposure time mainly corresponds to high-dynamic scenes. The darker area of ​​the image is at a suitable brightness, while the one with a shorter exposure time mainly corresponds to the brighter area in the high dynamic scene at an appropriate brightness, and then through the fusion of the two images and making up for each other's deficiencies, the high dynamic range is finally achieved The normal purpose of displaying all the information in the image in the scene. [0003] A high dynamic range camera needs to u...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the technical solution of the present invention is that the dynamic range of the image synthesized by the automatic exposure algorithm of the existing high dynamic range camera is limited, or short exposure underexposure and long exposure overexposure are prone to occur in high dynamic range scenes, resulting in no effective image information

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