A dynamic range automatic adjustment method based on electron multiplication for micro-line array

Abstract

An automatic dynamic range adjustment method based on electronic multiplication for micro-line arrays, which counts the gray histogram of the current row image, and gives the proportion of data in three different intervals of the histogram, that is, the characteristic data of the histogram of the current row image; compare it with the historical The data is weighted and accumulated as a criterion for dynamic range adjustment; the iterative image histogram feature data is brought into the dynamic range adjustment strategy table to obtain the recommended value of electronic multiplication equivalent gain. Make rationality and event conflict judgments on the recommended value of electronic multiplication equivalent gain, and give the actual executable electronic multiplication equivalent gain value; obtain the electronic multiplication driving amount of the low-level line array camera by looking up the executable electronic multiplication equivalent gain value , so as to realize the automatic control of the dynamic range of the camera.

Description

technical field [0001] The invention relates to a method for automatically adjusting the dynamic range of a micro-line array camera based on electronic multiplication, in particular to a method for automatically adjusting the dynamic range of a micro-line array camera through an image histogram adjustment strategy and electronic multiplication adjustment. Background technique [0002] Low-light CCD (EMCCD) has the ability to image faint objects under low illumination. Low-light CCD uses high-performance low-noise output amplification technology and electronic multiplication gain adjustment technology to achieve high dynamic range imaging. However, the electron multiplier of the low-light CCD should not be changed frequently, otherwise the output stability of the electron multiplier will be affected. Moreover, the processing method for the nonlinear response characteristics of electron multiplication is rarely involved in the description of the method for automatically adjus...

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Problems solved by technology

For example, in "Real-time automatic gain control algorithm using linear array TDICCD camera", the maximum and minimum values ​​of the image after denoising processing are used as the criterion for gain adjustment, and "A fast automatic exposure control method applied to CMOS image sensor" The image mean value is used as the gain adjustment criterion, and the "Research on Automatic Exposure Method Based on Brightness Histogram Width" also uses an index in the histogram as the gain adjustment criterion, which lacks an overall understanding of the image information distribution. , the judgments made are not reliable enough

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