A Method of 3-D object Recognition Based on Digital Holography

In this paper a method of three-dimensional object recognition based on digital holography is presented. Firstly,the holograms of the target and reference objects are generated with the digital holography technique. Next, the reconstructed images of the holograms are inputted into the joint transform correlator and modified by the subtraction of the zero-order diffraction from the joint power spectrum, and then the 3-D object recognition can be achieved. After applying an improved Mexican-hat wavelet to extract the edge characteristics and enhance the image of the power spectrum, sharper correlation peak can be obtained. The experimental results show that this method can improve the 3-D object recognition ability and reliability effectively.