Adaptive Geometry Calibration Method for Light Field Camera

Abstract

The invention discloses a self-adaption geometric calibration method of a light field camera. The method comprises the steps: collecting a reference image I, and calculating a pixel distance n between every two micro lens subimages and a relative included angle theta between a micro lens array and an image sensor array on the basis of a spectrogram of the reference image; correcting a parallel error of the reference image I on the basis of the relative included angle theta, so as to obtain a corrected reference image Ir, and calculating a center coordinate (xc, yc) of each micro lens subimage; and correcting a parallel error of an actual image on the basis of the relative included angle theta, then calculating the pixel distance n' between every two micro lens subimages on the basis of the corrected actual image, and calculating an actual center coordinate (x'c, y'c) of each micro lens subimage by utilizing the center coordinate (xc, yc) and the ratio of the pixel distance n' to the pixel distance n, so that the self-adaption geometric calibration of the light field camera can be realized. By adopting the method disclosed by the invention, the reference image only needs to be shot once, the automatic calibration on the light field camera with different lens parameters can be performed, so that the self-adaption geometric calibration of the light field camera can be realized.

Description

technical field [0001] The invention relates to the technical field of light field cameras, in particular to an adaptive geometric calibration method for a light field camera. Background technique [0002] Light field imaging technology is a kind of "computational imaging" technology developed by the close combination of information processing technology and optical imaging technology. Obtain the four-dimensional light field distribution of the target through the imaging system, and then use information processing technology to invert the light field, which has the function of "imaging first and then focusing". The light field camera breaks through the mutual constraint relationship between the imaging depth of field and the relative aperture, and can obtain a clear image with a large depth of field under the condition of a large aperture. At the same time, it also simplifies the mechanical focusing mechanism of the optical camera and improves the stability and reliability o...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an adaptive geometric calibration method for a light field camera, which can automatically calibrate light field cameras with different lens parameters only by shooting a reference image once, and solves the need for multiple repeated acquisitions of light field cameras Problems with reference images

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