Double-optical-path synthetic aperture hologram splicing method

Abstract

The invention discloses a double-light-path synthetic aperture hologram splicing method. The method comprises the following steps of constructing and setting an imaging light path and a calibration light path; collecting 2N holograms on the imaging light path and the calibration light path; calculating and obtaining the relative positions of the 2N holograms; and acquiring relative displacement ofthe N detection positions according to the relative positions to realize registration of an object hologram. That is to say, a double-coaxial holographic light path system is established, a camera istranslated at multiple positions to record holograms of a point source and an imaging object respectively, retrieval and reading of the information of each detection position are realized by utilizing the information of the point source, and finally sub-holograms detected at multiple positions are spliced. The method has advantages of low optical path complexity, low erection cost, no requirementof overlapping of detection areas of adjacent holograms during acquisition at a plurality of detection positions, realization of detection at any position on a detection plane, equivalent size of a calibration dot object to the pixel size, and realization of pixel-level position alignment.

Description

technical field [0001] The invention relates to the technical field of digital holography, in particular to a method for splicing double optical path synthetic aperture holograms. Background technique [0002] Holographic technology can record the amplitude and phase of the object at the same time. With the development of high readout speed and high resolution imaging device CCD (charge coupled device) or CMOS (metal oxide semiconductor), digital holographic technology has been widely used in display Micro-imaging, image recognition and encryption and other fields. Diffraction theory shows that the optical imaging system is equivalent to a low-pass filter, which retains the low spatial frequency of the object spectrum but loses part of the high-frequency information. For digital imaging, the limited number of pixels in a sensor (such as a CCD) is another factor that limits the spatial bandwidth of an imaging system. The combination of digital holography and synthetic apert...

AI Technical Summary

Problems solved by technology

The multi-sensor recording method can be used, but the cost of the multi-sensor recording method is high, there are strict requirements on vibration isolation, and pixel-level position matching of multiple captured images is required

The method of detector translation can also be used, but the registration of translation requires overlapping parts of adjacent detection areas, which increases the complexity of the operation

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