Design and imaging analysis of high dynamics scientific CMOS camera

Hong-hai SUN; Shu-wen HE; Pei WU; Yan-jie WANG

doi:10.3788/YJYXS20173203.0240

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Design and imaging analysis of high dynamics scientific CMOS camera

Display and Image | 更新时间：2020-07-07

- Design and imaging analysis of high dynamics scientific CMOS camera
- Chinese Journal of Liquid Crystals and Displays Vol. 32, Issue 3, Pages: 240-248(2017)
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所, 吉林长春 130033
  2.北方自动控制技术研究所, 山西太原 030006
  3.中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20173203.0240
  CLC： TP212
- Received：09 November 2016，
  
  Accepted：13 December 2016，
  
  Published：2017-03
- 稿件说明：
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Hong-hai SUN, Shu-wen HE, Pei WU, et al. Design and imaging analysis of high dynamics scientific CMOS camera[J]. Chinese journal of liquid crystals and displays, 2017, 32(3): 240-248.
DOI：

Hong-hai SUN, Shu-wen HE, Pei WU, et al. Design and imaging analysis of high dynamics scientific CMOS camera[J]. Chinese journal of liquid crystals and displays, 2017, 32(3): 240-248. DOI： 10.3788/YJYXS20173203.0240.

摘要

为了满足高动态范围高灵敏度的全局曝光模式下成像系统的需求，基于CIS-2521科学级CMOS图像传感器设计了一个相机系统，通过分析CIS-2521芯片像素读出结构特点，通过芯片内部模拟相关双采样与FPGA片内数字域相关双采样完成相关四采样算法，列向噪声去除效果明显。通过设计曲线拟合双增益通道图像数据合成输出，保证了系统成像有较高输出动态范围。相机常温下输出图像峰值信噪比达62.9 dB，采用半导体制冷后输出图像峰值信噪比74.3 dB。根据EMVA1288标准实测相机动态范围达到78.2 dB，设计的相机系统实现了每秒50帧2 560×2 160像素，16 bit深度高清晰度高动态范围图像的实时全局曝光成像输出，能够满足低照度条件下的高帧频高动态范围成像的需求。

Abstract

In order to satisfy the demand of the imaging system under the global exposure mode of high dynamic range and high sensitivity

we designed a camera based on the CIS-2521 scientific CMOS image sensor

implementing the correlated quadruple sampling algorithm in the FPGA by analyzing the feature of CIS-2521's pixel readout structure and combining its built-in circuit of correlative double sample

and it denoises the vertical noise obviously. The imaging system has higher output dynamic range of the image data by designing a curve matching the double gain channels. The output image peak signal to noise ratio of the camera can reach 62.9 dB under the room temperature

and can reach 74.3 dB using the semiconductor refrigeration. The dynamic range of the camera can reach 78.2 dB according to EMVA1288 standard. The designed camera can realize the global exposed real time imaging output with high definition and high dynamic range for 2 560×2 160 and 16 bits images under 50 fps

and can satisfy the demand of the high frame frequency and high dynamic range under the low brightness.

关键词

Keywords

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