光电混合联合变换相关器目标探测与识别

Hybrid Photoelectric Joint Transform Correlator for the Detection and Recognition of Objects

用电寻址液晶 EAL CD作为空间光调制器 SL M,用计算机控制的 EAL CD并排显示参考信号和实时扫描的目标信号 ,并用面阵 CCD作为平方律探测器记录其联合变换功率谱 ,通过光学傅立叶变换 ,输出相关信号 ,识别目标并确定目标在空间的方位。其特点是 ,由于用 CCD探测功率谱 ,可以用各种数字处理技术提高系统的信噪比 ,并能更精确的探测和识别目标 ;采用光学傅立叶变换及光学相关探测使所有采样点并行处理 ,并以光速进行 ,提高了处理速度。

Electrically addressed liquid crystal displays (EALCD) is used as spatial light modulator (SLM). EALCD is controlled by computer displays reference signals and target signals in a row. In addition, CCD matrix camera as square law detector records joint transform power spectrum. Through the optical Fourier transform, CCD detector outputs the correlated result, recognizes targets and ascertains the spatial directions of targets. The feature is: owing to CCD detects the power spectrum, we may improve the SNR of system with all kinds of digital image processing technology, and detect and recognize objects more precisely; by using optical Fourier transform and optical correlation detection, all sample spots can be processed simultaneously, and the processing is at a speed of light velocity, so the speed of the processing is highly increased.