The algorithm and implementation of EMCCD automatic gain adjustment based on fixed gray level

Le Luo; Qian Chen; Wei-Ji He; Zhen-Xi Lu

doi:10.1117/12.2201041

15 October 2015 The algorithm and implementation of EMCCD automatic gain adjustment based on fixed gray level

Le Luo, Qian Chen, Wei-Ji He, Zhen-Xi Lu

Proceedings Volume 9674, AOPC 2015: Optical and Optoelectronic Sensing and Imaging Technology; 96742G (2015) https://doi.org/10.1117/12.2201041
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

The image quality and resolution will be affected, if the multiplication gain value of EMCCD imaging system is too low or too high. This paper presents the algorithm of EMCCD automatic gain adjustment based on fixed gray level. The algorithm takes the average brightness of the image as a measure of image quality. It calculates the multiplication gain adjustment value through the calculation of average brightness of current frame image, combining the two gray level threshold values and the system exposure function, so that the next frame image will achieve the ideal brightness value. On the basis of the algorithm, this paper builds a multiplication gain adjustment control circuit and a multiplication gain resistor lookup table. Then, we can achieve automatic adjustment of multiplication gain by changing the resistance value of the digital potentiometer in the circuit. Experimental results show that the image quality can be effectively improved, by using the algorithm of automatic gain adjustment based on fixed gray level. After adjustment, the brightness of the image is moderate, contrast enhanced, and the details more clear.

Citation Download Citation

Le Luo, Qian Chen, Wei-Ji He, and Zhen-Xi Lu "The algorithm and implementation of EMCCD automatic gain adjustment based on fixed gray level", Proc. SPIE 9674, AOPC 2015: Optical and Optoelectronic Sensing and Imaging Technology, 96742G (15 October 2015); https://doi.org/10.1117/12.2201041

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KEYWORDS

Electron multiplying charge coupled devices

Imaging systems

Resistance

Image quality

Electrons

Digital electronics

Charge-coupled devices

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