Wang Xiao-rui, Zhang Jian-qi, Feng Zhuo-Xiang, Chang Hong-Hua
School of Technical Physics, Xidian University, Xi'an Shaanxi, China.
Appl Opt. 2005 Jul 20;44(21):4470-4. doi: 10.1364/ao.44.004470.
Microscanning is an important technique in high-resolution electro-optical imaging. It can increase the resolution and improve the performance of imaging systems. For optimum design of a staring imaging system with microscanning modes it is necessary to choose the optimum microscanning mode according to the fill factor of the detector. Hence it is important to study the effect of the fill factor on the microscanning image quality. With some assumptions, we introduce the sampling-averaging modulation transfer function of a detector array at the spatial Nyquist frequency with which to study quantitatively the improvement in image quality of various microscanning modes for selected fill factors (1, 2/3, and 1/2). Analytical results show that the amount of improvement is closely associated with the fill factor. Finally, typical sampling imaging of focal plane arrays with these fill factors are simulated. Experimental results qualitatively describe the effect of the fill factor on the microscanning image and show good agreement with theoretical analysis.
微扫描是高分辨率电光成像中的一项重要技术。它可以提高分辨率并改善成像系统的性能。对于具有微扫描模式的凝视成像系统的优化设计，有必要根据探测器的填充因子选择最佳的微扫描模式。因此，研究填充因子对微扫描图像质量的影响很重要。在一些假设的基础上，我们引入了探测器阵列在空间奈奎斯特频率处的采样平均调制传递函数，用以定量研究选定填充因子（1、2/3和1/2）下各种微扫描模式的图像质量提升情况。分析结果表明，提升量与填充因子密切相关。最后，对具有这些填充因子的焦平面阵列进行了典型的采样成像模拟。实验结果定性地描述了填充因子对微扫描图像的影响，并且与理论分析结果吻合良好。
