Research on an adaptive gray stretch algorithm for digital low-light-level devices

Ye Yang; Zhou Zheng; Lei Yan; Kun Han; Xiaogang Dang; Hongchang Cheng; Gangcheng Jiao; Pengbo Yang; Shiwei Lei

doi:10.1117/12.2620522

27 March 2022 Research on an adaptive gray stretch algorithm for digital low-light-level devices

Ye Yang, Zhou Zheng, Lei Yan, Kun Han, Xiaogang Dang, Hongchang Cheng, Gangcheng Jiao, Pengbo Yang, Shiwei Lei

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 121690O (2022) https://doi.org/10.1117/12.2620522
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

When the classical gray stretching algorithm is applied in digital low light level devices, it cannot meet the requirements of illumination environment change in large dynamic range, and the image processed under very low illumination or very high illumination is prone to the loss of target details, an adaptive gray stretching algorithm suitable for digital low light level devices is designed. The algorithm adds the variable of the brightness value of the original image information collected by the digital low light level device to the gray stretching transformation matrix, deduces the current environmental illuminance value according to the transformation of the brightness value, timely adjusts the relevant parameters in the gray stretching calculation matrix according to the environmental illuminance value, and obtains the gray stretching transformation matrix suitable for different image features under different illuminance environments, In order to meet the requirement that digital low light level devices should be suitable for the change of illumination environment in a large dynamic range. This paper also compares the adaptive algorithm with the classical algorithm, and gives the test results. At the end of the paper, the operation efficiency of the algorithm is tested to verify that the algorithm can meet the requirements of real-time image processing speed of digital low light level devices.

Citation Download Citation

Ye Yang, Zhou Zheng, Lei Yan, Kun Han, Xiaogang Dang, Hongchang Cheng, Gangcheng Jiao, Pengbo Yang, and Shiwei Lei "Research on an adaptive gray stretch algorithm for digital low-light-level devices", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 121690O (27 March 2022); https://doi.org/10.1117/12.2620522

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KEYWORDS

Image processing

Image enhancement

Image information entropy

Digital image processing

Night vision

Digital Light Processing

Detection and tracking algorithms

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