A method for automatic adjustment of emccd gain
An automatic adjustment and gain value technology, applied in the field of image processing, can solve problems such as overexposure, poor adaptability to light conditions, and underexposure, so as to improve adaptability, overcome inconvenience and inaccuracy, and achieve good practical value Effect
Inactive Publication Date: 2018-04-03
NANJING UNIV OF SCI & TECH
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Problems solved by technology
Simply setting a fixed value of "intermediate brightness" will result in underexposure or overexposure
In short, the existing automatic gain adjustment methods for EMCCD images are not adaptable to complex and changeable lighting conditions.
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The invention discloses an EMCCD gain automatic adjustment method. Set the working mode of the camera to continuous photo mode, calculate and judge whether the average brightness of the current frame image is in the optimal brightness range, if the average brightness of the current frame image is in the optimal brightness range, then judge the lighting conditions of the current frame image and according to The judgment result adjusts the exposure time of the next frame image captured by the EMCCD camera. If it is not in the optimal brightness range, then judge the gain of the current frame image according to the brightness average value of the current frame image, and adjust the EMCCD camera according to the judgment result. The exposure time of one frame of image; then calculate the gain value of the next frame of image to realize the brightness adjustment of the next frame of image. The invention improves the adaptability of the EMCCD shooting system under complex and changeable lighting conditions, so that the brightness of the captured image after automatic gain adjustment is improved.
Description
A kind of EMCCD gain automatic adjustment method technical field The invention belongs to the technical field of image processing, in particular to an EMCCD gain automatic adjustment method. Background technique Automatic gain adjustment is to calculate the brightness value and gain of the current EMCCD image (ie, electron multiplying CCD image), and feedback through comparison and judgment to adjust the gain level to automatically adjust the image brightness to improve image brightness and contrast. At present, the traditional automatic gain algorithm based on exposure function calculation, such as the literature (EMCCD multiplication gain automatic adjustment algorithm, Lu Zhenxi, He Weiji, etc., Proceedings of the Tenth National Optoelectronic Technology Academic Exchange Conference, 2012), the prominent method is in the calculation of exposure time value. When calculating, a fixed value of "intermediate brightness" is used as a reference for calculation, that is, a fi...
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IPC IPC(8): H04N5/235
Inventor 张闻文陈锋陈钱顾国华何伟基钱惟贤隋修宝屈惠明路东明于雪莲任侃王利平王庆宝张毅
Owner NANJING UNIV OF SCI & TECH