Kodate K, Hashimoto A, Thapliya R
Department of Mathematical and Physical Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan.
Appl Opt. 1999 May 10;38(14):3060-7. doi: 10.1364/ao.38.003060.
Taking advantage of small aberrations, high efficiency, and compactness, we developed a new, to our knowledge, design procedure for a binary zone-plate array (BZPA) and applied it to a parallel joint transform correlator for the recognition of the human face. Pairs of reference and unknown images of faces are displayed on a liquid-crystal spatial light modulator (SLM), Fourier transformed by the BZPA, intensity recorded on an optically addressable SLM, and inversely Fourier transformed to obtain correlation signals. Consideration of the bandwidth allows the relations among the channel number, the numerical aperture of the zone plates, and the pattern size to be determined. Experimentally a five-channel parallel correlator was implemented and tested successfully with a 100-person database. The design and the fabrication of a 20-channel BZPA for phonetic character recognition are also included.
利用小像差、高效率和紧凑性，据我们所知，我们开发了一种用于二元波带片阵列（BZPA）的新设计程序，并将其应用于用于人脸识别的并行联合变换相关器。人脸的参考图像和未知图像对显示在液晶空间光调制器（SLM）上，由BZPA进行傅里叶变换，强度记录在光寻址SLM上，并进行傅里叶逆变换以获得相关信号。考虑带宽可以确定通道数、波带片的数值孔径和图案尺寸之间的关系。通过实验实现了一个五通道并行相关器，并在一个包含100人的数据库上成功进行了测试。还包括用于语音字符识别的20通道BZPA的设计和制造。
