A real-time programmable joint transform correlator

Correlation postprocessing-based method for the detection of defocused images

“…4 Since 1966 several improvements in this architecture have been proposed to obtain real-time detection with liquid-crystal devices. 5,6 During the past few years most authors of papers published in the pattern-recognition field have analyzed different systems to increase discrimination capability. In particular, the binarization of the joint power spectrum ͑JPS͒ has been used widely and has been shown to be a reliable method.…”

Pattern Recognition Based on YIQ Colour Space with Simulated Annealing Algorithm and Optoelectronic Joint Transform Correlation

“…In 1966, Weaver and Goodman introduced the JTC for pattern recognition application. A few years later, LCD based JTC [3] proposed by Yu and Lu became an attractive tool for pattern recognition. Since then, the JTC configuration has received increased attention in the past several years because of the less restrictive alignment requirement in comparison with the VLC.…”

Effect of resolution and image quality on combined optical and neural network fingerprint matching

“…It is based on the conventional VanderLugt correlator [1]. The target fingerprint image is loaded on an spatial hght modrdator, (SLM) Although the spatial heterodyning technique, often called joint transform correlator [8], has many advantages for real-time apphcations [9,10] and was used ia most of the recent fingerprint recognition experiments [11, 12, The exact mechanism for the significant increase in SNR for binary inputs is not completely understood. However, several previous works [17,18] 14.…”