基于最小可分辨对比度的CCD成像系统最佳角放大率研究

Optimal Angle Magnification for CCD Imaging Systems Based on Minimum Resolvable Contrast

光电成像系统存在一个最佳角放大率,使人眼与成像系统达到最佳匹配状态,系统获得最佳性能。基于MRC物理意义,提出MRC信道宽度CCD成像系统综合性能评价方法,通过实际CCD成像系统的观察实验确定了评价模型的表达式,分析了各种系统参数变化对该方法的影响。结果表明,利用MRC信道宽度评价方法描述的最佳角放大率变化与实际情况一致。在最佳角放大率情况下,系统与人眼视觉得到最佳匹配。

There exists an optimal angle magnification to make the optodectronic imaging system and human eye matching optimally, and under this condition the optoelectronic imaging system presents the optimal performance. A new evaluation method, minimum resolvable contrast （MRC） channel width, is proposed based on the physical meaning of MRC which can attain the optimal angle magnification for CCD imaging systems. The expression of MRC channel width is built through viewing experiments of CCD imaging systems. The impact of the change of several system parameters on MRC channel width is also analyzed. Results show that the optimal angle magnification attained from MRC channel width has good consistency with practical application.