An Improved Automatic Camera Exposure Time Control Method for High-Temperature DIC Measurement

Zhang, Xiaohui; Li, Chenzhuo

doi:10.1007/s40799-022-00607-z

Cited by 1 publication

(1 citation statement)

References 31 publications

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“…There is an image with a size of m×n, and I i, j corresponds to the brightness value of each pixel. , then the average brightness of the image is shown in formula (1):…”

Section: Weight Meanmentioning

confidence: 99%

Realization of automatic exposure algorithm of color camera based on FPGA

Wen¹,

Wang²,

Zhu³

2023

International Conference on Image, Signal Processing, and Pattern Recognition (ISPP 2023)

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With the development of aerospace technology, obtaining high-quality and high-precision imaging in the space environment puts forward higher requirements for the automatic exposure system of the terrain camera.The traditional automatic exposure algorithm will have obvious defects such as image quality degradation under complex lighting conditions, especially in the environment of backlight and uneven lighting distribution. Based on the automatic exposure system of FPGA, a fast automatic exposure algorithm based on variable step size is proposed.Firstly, the integration time is initially adjusted with a variable step size by using the weight mean value, and then the integration time is further adjusted with a fixed step size according to the gray histogram. The experimental results show that it can be accurately exposed under normal lighting and special lighting such as backlight, and the exposure time and image information entropy are improved compared with the traditional exposure algorithm.This method is suitable for special lighting conditions and can meet the imaging requirements of terrain cameras.

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“…There is an image with a size of m×n, and I i, j corresponds to the brightness value of each pixel. , then the average brightness of the image is shown in formula (1):…”

Section: Weight Meanmentioning

confidence: 99%