Mendlovic D, Konforti N, Marom E
Appl Opt. 1989 Dec 1;28(23):4982-6. doi: 10.1364/AO.28.004982.
A logarithmic-logarithmic coordinate transformation is used to perform successfully scale and projection (tilt) invariant optical pattern recognition. The coordinate transformation is achieved optically using a computer generated hologram divided into four different quadrants since the logarithmic function does not exist for negative values of the argument. The transformed pattern is introduced into a VanderLugt correlator setup through a liquid crystal light valve. Initial experimental results are presented.
采用对数-对数坐标变换成功实现了尺度和投影（倾斜）不变光学模式识别。由于对数函数对于自变量的负值不存在，因此使用分为四个不同象限的计算机生成全息图以光学方式实现坐标变换。通过液晶光阀将变换后的图案引入到范德卢格特相关器装置中。给出了初步实验结果。
