Modification algorithms for improving the performance of holographically stored multiplexed correlation filters

Several filter algorithms are developed for the purpose of modifying the tr ansmissivity of many matched filters multiplexed onto one hologram. Each al gorithm optimizes, or approximately optimizes, a specified performance metr ic. Four pages of images are multiplexed onto a thin hologram, each page ha ving nine binary images. Computer simulation indicates that some algorithms operate over a wide range of obscurations (down to about 5% of the origina l image), while others have restricted operating ranges. This process has a pplication to both associative memories and correlation. Two new optical sc hemes are also proposed that can implement two of these modification filter s. (C) 2000 Society of Photo-Optical Instrumentation Engineers. [S0091-3286 (00)00905-3].