基于张量优化的高动态范围微光相机设计与实现

针对空间低照度环境下，互补金属氧化物半导体(CMOS)相机成像视觉效果不佳的问题，基于张量优化的图像融合方法研制一款高动态范围的微光相机。分析基于科学互补金属氧化物半导体(sCMOS)图像传感器亮暗场双通道ADC的电路特性，利用同源双通道图像数据构建三阶特征张量，通过对特征张量的平行因子分析，以融合图像动态范围最优为评价函数，引入拉格朗日乘数法作为张量分解的优化算法，实现实时的高分辨力高动态范围成像。研制一款基于LTN4625的微光相机，并进行成像实验。仿真实验结果表明，相机实现了50帧/s，4 608×2 592像素的高分辨力高动态范围成像，图像动态范围从低增益数据的5.2 dB和高增益数据的11.4 dB提高到了54.7 dB。该设计是一种微弱光环境下动态响应范围高、成像效果好的微光相机设计方法。

Design and implementation of a high dynamic range low-level-light camera based on tensor optimization

A low-light-level camera system is designed based on the scientific Complementary Metal Oxide Semiconductor(CMOS) image sensor LTN4625 in order to meet the requirements of the high resolution and high dynamic range low light imaging system. According to the readout structure characteristics of pixel of LTN4625,the FPGA is taken as the control core of the camera system and an image fusion algorithm based on tensor optimization is proposed. The dynamic range of the camera is extended effectively and the image quality is improved. The imaging test results show that the camera can output pictures at 50 fps and the resolution of image is 4 608×2 592. The dynamic range of image is improved to 54.7 dB from 5.2 dB for low gain data and 11.4 dB for high gain data. This design is a kind of low-light-level camera design method with high dynamic response range and good imaging effect under weak light environment.