Multi-exposure imaging system and method for eliminating rolling shutter flicker
AssigneeHimax Imaging Limited
InventorYuan-Chih Peng
Life of this patent
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Abstract
A method for eliminating flicker of a multi-exposure imaging system is provided. The method includes the steps of: capturing a long exposure image based on a long exposure from a scene; capturing a short exposure image based on a short exposure from the scene; obtaining an exposure ratio of the long exposure to the short exposure; generating a long accumulated value by accumulating pixel values of a portion of the long exposure image; generating a short accumulated value by accumulating pixel values of a portion of the short exposure image corresponding to the portion of the long exposure image; and generating a flicker gain according to the long average value, the short average value and the exposure ratio.
Claims16
A multi-exposure imaging system, comprising:
- a long exposure image sensor for capturing a long exposure image based on a long exposure from a scene;
- a short exposure image sensor for capturing a short exposure image based on a short exposure from the scene;
- an exposure ratio calculator for obtaining an exposure ratio of the long exposure to the short exposure;
- and
- a flicker gain detector for generating a long accumulated value by accumulating pixel values of a portion of the long exposure image, for generating a short accumulated value by accumulating pixel values of a portion of the short exposure image corresponding to the portion of the long exposure image, and for generating a flicker gain according to the long accumulated value, the short accumulated value and the exposure ratio.
A multi-exposure imaging system for capturing a video under an environment with a periodic flicker, comprising:
- a long exposure image sensor for capturing a first long exposure frame based on a long exposure from a scene and subsequently capturing a second long exposure frame based on the long exposure;
- a short exposure image sensor for capturing a first short exposure frame based on a short exposure from the scene and subsequently capturing a second short exposure frame based on the long exposure;
- an exposure ratio calculator for obtaining an exposure ratio of the long exposure to the short exposure;
- and
- a flicker gain estimator for generating a second flicker gain of the second short exposure frame based on a first flicker gain of the first short exposure frame.
A method for eliminating flicker of a multi-exposure imaging system, comprising the steps of:
- capturing a long exposure image based on a long exposure from a scene;
- capturing a short exposure image based on a short exposure from the scene;
- obtaining an exposure ratio of the long exposure to the short exposure;
- generating a long accumulated value by accumulating pixel values of a portion of the long exposure image;
- generating a short accumulated value by accumulating pixel values of a portion of the short exposure image corresponding to the portion of the long exposure image;
- and
- generating a flicker gain according to the long average value, the short average value and the exposure ratio.
Dependencies are inferred from the claim text.