In this article principles of operation of a coherent optical image correlator based on a well know optical joint transform correlator are examined. Theoretical predictions and experimental data for of the optical image correlator with a holographic filter recorded on a thin holographic photographic plates PFG - 01 are analyzed. Results of the operation of the dynamic joint transform correlator on the basis of cadmium fluoride crystal, CdF2, with bistable impurity centers are demonstrated. Calculated and experimental correlation peak intensity dependencies with the scale and angular mismatch between an observed and reference objects for static and dynamic joint transform correlators are compared. Tangram figures were used as a test images. In the paper all computations were performed by use of MATLAB 7.0.1 mathematical program.

Experimental results show that dynamical hologram recorded in CdF2:Ga crystal allows one to get rather intensity correlation signal to detect it at wide dynamical range with CCD. Noise registered at the output plane of the JTC is mainly due to lens aberrations, optical elements misalignments and light scattering with the crystal volume. Registration system noise doesn’t affect the resulting noise level since CCD operates far from its threshold of sensitivity. To raise discrimination capability of the JTC proposed it can be added by wavelet filter that realize wavelet-transform operation. It is well known that the wavelet transform is an effective tool for feature extraction in pattern recognition.

In this paper we proposed JTC with joint transform dynamical holographic filter based on CdF2:Ga crystal. JTC operation is presented at room temperature that gives correlation procedure rate at the range of 0.1–1 Hz. Experimental results demonstrate JTC ability to discriminate different kinds of objects, both simple and complex.

As an image recognition system demonstrated real-time dynamic holographic Joint Transform Correlator (JTC) based on the volume dynamic holographic environment - cadmium fluoride crystals with bistable impurity centers of gallium. Experiments showed the possibility of using this correlation to the recognition of industrial buildings. We propose a coherent architecture of the dynamic image correlator based on Optical Wavelet Transform with the recording of holographic spatial filters in crystals CdF2: Ga.