20 March 2001 Optical techniques for three-dimensional image recognition
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Abstract
We describe several optoelectronic methods based in digital holography for recognition of 3D images. The phase and amplitude of a Fresnel diffraction pattern of a 3D reference object is measured with digital holography. This complex information is compared with that coming from a similar digital hologram of a 3D input scene using correlation techniques. In this way, the method allows us to detect the presence of the 3D reference object in the 3D input scene with high discrimination. Pattern recognition techniques that are shift-variant or shift-invariant along the optical axis are described. In the later case it is possible to detect the 3D position of the reference in the input scene with high accuracy. Using the information contained in the digital holograms it is also possible to measure small 3D orientation changes of a 3D object. Experimental results are presented.
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Enrique Tajahuerce, Osamu Matoba, Bahram Javidi, "Optical techniques for three-dimensional image recognition", Proc. SPIE 4387, Optical Pattern Recognition XII, (20 March 2001); doi: 10.1117/12.421150; https://doi.org/10.1117/12.421150
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