Implementation of a Nonzero-order Joint Transform Correlator Using Interferometric Technique

et al. 2007

SPIE Proceedings

A novel nonzero-order joint transform correlator system with the Mach-Zehnder configuration for polychromatic pattern recognition is presented. To remove zero order term is a very important thing for optical pattern recognition. We cleverly utilize the Stokes relations to remove the large zero order term directly in only one step in this structure. In the proposed technique, we investigate color pattern recognition with YIQ channels involving in-plane distortion such as rotations. Furthermore, the utilization of minimum average correlation energy to generate the composite reference image for enhancing the correlation output is also studied. The computer simulation results are presented to show the validity of the proposed technique.

Section: Introductionmentioning

confidence: 99%

A Mach-Zehnder nonzero order joint transform correlator based on the YIQ color space for polychromatic pattern recognition

Lee

et al. 2007

SPIE Proceedings

“…To deal with the DC term, Lu et al [4] adoped phase-shifting technique to design a nonzero-order JTC (N0JTC) and Li et al [6] used the joint transform power spectrum (JTPS) subtraction strategy to realize the N0JTC. The Mach-Zehnder JTC (MZJTC) [6] can remove the zero-order term in only one step directly without storing the Fourier spectra of both the reference and target images beforehand.…”

Section: Introductionmentioning

confidence: 99%

“…The Mach-Zehnder JTC (MZJTC) [6] can remove the zero-order term in only one step directly without storing the Fourier spectra of both the reference and target images beforehand. Later, Chen et al [7,8] adopted constraint optimization based on Lagrangian method to yield a sharp correlation peak.…”

Section: Introductionmentioning

confidence: 99%

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

2016

AIVP

For pattern recognition on various views of the interested colour object, we adopt the YIQ colour space when using simulated annealing algorithm to design the template matching function. Joint transform correlation is devoted for recognition of colour targets. Quantized reference functions are designed for the purpose of display on liquid crystal spatial light modulators. Each reference function is trained with true class images rotated in-plane at 2 degrees intervals between -14 degrees and 14 degrees. Numerical result shows that, generally, YIQ space outperforms conventional RGB space.

“…The MachZehnder JTC (MZJTC) [6] can remove the zero-order term in only one step directly without storing the Fourier spectra of both the reference and target images beforehand. Later, Chen et al [7,8] adopted constraint optimization based on Lagrangian method to yield a sharp correlation peak.…”

Section: Introductionmentioning

confidence: 99%

“…Lu et al [4] utilized phase-shifting technique to design a nonzero-order JTC (N0JTC) and Li et al [6] used the joint transform power spectrum (JTPS) subtraction strategy to realize the N0JTC. The MachZehnder JTC (MZJTC) [6] can remove the zero-order term in only one step directly without storing the Fourier spectra of both the reference and target images beforehand.…”

Section: Introductionmentioning

confidence: 99%

Application of Simulated Annealing for Color Pattern Recognition to Hybrid Optoelectronic Joint Transform Correlator

Hsu

et al. 2015

AIVP

For invariant pattern recognition, a method using simulated annealing algorithm is introduced. Near optimal quantized reference functions are designed to be displayed on liquid crystal spatial light modulators. Mach-Zehnder joint transform correlator is adopted as the system for recognition of color targets. From numerical results, the optoelectronic pattern recognition system with simulated annealing algorithm shows a promising capability.