Joint transform correlator (JTC)-based high-accuracy photoelectric hybrid image motion measurement device and method

Abstract

The invention relates to a joint transform correlator (JTC)-based high-accuracy photoelectric hybrid image motion measurement device, which comprises a laser, a collimating lens, a spatial light modulator (SLM), a Fourier lens, a charge coupled device (CCD) and a digital processing unit, wherein the collimating lens is arranged on a light path of the laser; the SLM is arranged on an emergent light path of the collimating lens; the Fourier lens is arranged on the emergent light path of the SLM; the CCD is used for receiving emergent light rays from the Fourier lens; and the digital processing unit is connected to the output end of the CCD, and is used for performing local discrete Fourier transform calculation in combination with joint transform power spectrum data to obtain up-sampling images of neighborhoods of correlated peaks. In the JTC-based high-accuracy photoelectric hybrid image motion measurement device, only a set of optical Fourier transform device is required, so the volume and cost of the whole detection device are reduced, and the complexity of a system is reduced. In adopted correlated peak detection technology, the high-resolution interpolation data of the correlated peaks can be obtained under the condition of not increasing the amount of calculation, and the high-accuracy detection of dislocation or image motions among the images can be realized.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection, and relates to an optical joint transformation correlation method and a measurement device for image registration and image motion measurement. Background technique [0002] In recent years, the research on optical correlation has developed very rapidly, from the earlier matched filter (Vander Lugt Correlator) to the joint transform correlator (Joint Transform Correlator-JTC), from pure optical system to computer-controlled optoelectronic hybrid system. The joint transform correlator not only has the advantages of optical parallel processing, large capacity and high speed, but also has the flexibility and programmability of computer processing. Therefore, the joint transform correlator has been widely used in many fields such as machine vision, target tracking, object detection, and optical computing. Similarly, the joint transform correlator can also be applied in the field of r...

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Problems solved by technology

However, this processing process increases the complexity of the entire detection process, and is susceptible to images of various intermediate links, which limits the further improvement of detection accuracy.

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