Miller P C
Tactical Surveillance Systems Division, Defence Science and Technology Organisation, P.O. Box 1500, Salisbury SA 5108, Australia.
Appl Opt. 1998 Jun 10;37(17):3664-77. doi: 10.1364/ao.37.003664.
The design of reduced-resolution filters by multiresolution analysis (MA) or by downsampling is extended to spatial light modulators with fill factors less than one. Analysis shows that the dependence of the zero-order correlation peaks with fill factor varies with target size for both design techniques. Also, a practicable performance improvement is obtained for MA compared with downsampling for small- to medium-sized targets that is greater for larger fill factors. The validity of the analysis is confirmed by simulation. A reduced-resolution optical correlator is constructed, and a comparison of MA and downsampling filters is performed for different-sized targets. The experimental results show good qualitative agreement with the simulation; however, the first-order correlation peaks were found to be greater for the experimental results. A possible reason for this is that the manufacturer's fill-factor specification might be too large; therefore a new technique for measuring the fill factor is proposed.
通过多分辨率分析（MA）或下采样设计低分辨率滤波器的方法被扩展到填充因子小于1的空间光调制器。分析表明，对于这两种设计技术，零阶相关峰与填充因子的相关性会随目标尺寸而变化。此外，对于中小尺寸目标，与下采样相比，MA可实现切实可行的性能提升，且填充因子越大提升越明显。通过仿真验证了分析的有效性。构建了一个低分辨率光学相关器，并针对不同尺寸目标对MA滤波器和下采样滤波器进行了比较。实验结果与仿真结果在定性上吻合良好；然而，实验结果中的一阶相关峰更大。一个可能的原因是制造商给出的填充因子规格可能过大；因此，提出了一种测量填充因子的新技术。
