García-Martínez P, Martínez J L, Sánchez-López M M, Moreno I
Departamento de Optica, Universitat de València, C/Doctor Moliner 50, 46100 Burjassot, Spain.
Appl Opt. 2010 Sep 10;49(26):4866-73. doi: 10.1364/AO.49.004866.
We report a wavelength-compensated three-channel (RGB) joint transform correlator (JTC) for color pattern recognition using a ferroelectric liquid-crystal spatial light modulator (SLM) operating in binary pure phase modulation. We apply a previously reported time-multiplexing technique useful in creating wavelength-compensated diffraction patterns, based on the synchronization of properly scaled diffraction masks with the input wavelength selection obtained by applying a rotating RGB color-filter wheel to an Ar-Kr laser. The application of this technique to a JTC architecture permits real-time color object detection. In order to achieve a high light efficiency for the correlation process, we combine the design of zero-order joint power spectra in all color channels with the selection of a certain polarization configuration of the SLM, producing a broadband phase-only modulation. Excellent experimental results demonstrating color-object detection are provided.
我们报道了一种用于彩色图案识别的波长补偿三通道（RGB）联合变换相关器（JTC），它使用在二元纯相位调制下工作的铁电液晶空间光调制器（SLM）。我们应用了一种先前报道的时间复用技术，该技术基于将适当缩放的衍射掩模与通过将旋转的RGB滤色轮应用于氩氪激光器获得的输入波长选择同步，可用于创建波长补偿衍射图案。将该技术应用于JTC架构可实现实时彩色目标检测。为了在相关过程中实现高光效率，我们将所有颜色通道中的零阶联合功率谱设计与SLM的特定偏振配置选择相结合，产生宽带纯相位调制。提供了证明彩色目标检测的出色实验结果。
