Cojoc D, Molina M T, García J, Ferreira C
Appl Opt. 1997 Jul 10;36(20):4812-5. doi: 10.1364/ao.36.004812.
A variable radial coordinate transformation of the phase-only filter (POF) that is dependent on the energy's angular distribution of the target spectrum is used to perform shift- and scale-invariant pattern recognition. The POF of a basic size target and the cumulative energy of its angular distribution are calculated. The filter function is then transformed by means of stretching along the radial coordinate so that the same energy contribution to the correlation peak is provided for any size target. The maximum ratio for recognizing scaled objects is 1:1.5. Computer simulations and optical experiments showing the performances of the filter are presented.
采用一种仅相位滤波器（POF）的可变径向坐标变换，该变换取决于目标光谱能量的角分布，以实现平移和尺度不变模式识别。计算基本尺寸目标的POF及其角分布的累积能量。然后通过沿径向坐标拉伸来变换滤波函数，以便为任何尺寸的目标提供对相关峰相同的能量贡献。识别缩放物体的最大比例为1:1.5。给出了展示该滤波器性能的计算机模拟和光学实验结果。
