Color image recognition by use of a joint transform correlator of three liquid-crystal televisions

Abstract

We present a joint transform correlator for color image recognition by using three liquid-crystal spatial light modulators. A method for simultaneously obtaining the correlation peaks of red, green, and blue is proposed and experimentally demonstrated.

Structured light based optical pattern recognition:Principle and technical progress

“…并且随着空间光调制器性能的愈加稳定, 人们可以 摆脱全息法制作匹配滤波器的非实时识别, 采用光电 混合型实现准实时识别. 除了实时性的追求以外, 人 们还实现了对复杂图像识别, 比如人脸 [43][44][45][46] 、DNA序 列 [47] 、虹膜 [48] 等生物信息用于安全系统的识别以及三 维 [49][50][51][52] 、彩色物体 [53][54][55][56] 等其他维度的复杂识别. 最近 JTC的概念还被应用于编码解码领域 [57][58][59] .…”

Intensity invariant complex encoded color correlation

“…The data is parallelised but it is still effectively treating each colour as a separate correlation and combining the correlation plane results. Colour JTC have been shown by Yu et al [2] and Hsieh et al [3], quaternion and hyper-complex Clifford algebras have been successfully demonstrated for colour manipulation [4], image registration [5] and correlation [6] [7] [8] but since the data remains three dimensional, they are physically more difficult to realise in an optical system and when implemented on a computer they often involve multiple FFTs of the data, making them slow. This paper demonstrates a simple way of encoding colour information that can be implemented on a spatial light modulator or via a high speed FFT operation on an electronic processor.…”

Automatic colored traffic sign detection using optoelectronic correlation architectures

“…The application of optical correlation for color pattern recognition has been reported in some papers [8][9][10][11][12][13][14][15]. Out of the several schemes proposed so far, multichannel correlation is most widely used.…”