Gaussian optics-based focusing type light-field camera parameter calibration method

Abstract

The invention relates to a Gaussian optics-based focusing type light-field camera parameter calibration method. The invention aims to solve the problem that parameters such as a distance m between thefront end surface of a main lens to a micro lens array, a distance a from the micro lens array to a photosensitive element, and a distance b from the photosensitive element to a virtual image plane cannot be obtained through calibration in the prior art. As for the problem in the prior art, a dimensionless parameter virtual depth v=b / a is introduced, wherein v can be indirectly calculated according to geometrical similarity relations in a fixed focusing type light-field imaging system; a calibration device is built; a plurality of groups of object distances l1 and corresponding v are obtained; and curve fitting is performed on the plurality of groups of (v, l1), a Gaussian optics imaging formula is applied in a combined manner, so that the parameters of a camera can be obtained. Accordingto the method of the invention, calibration can be performed through simple Gaussian optics relationships so as to obtain the key parameters of the focusing type light-field camera; mathematical relationships are simple, and it does not need to define a coordinate system and complex matrix operation; and when the parameters are obtained by means of calibration, the relationship curve of virtual depths and object distances can be obtained. The method can be directly used for three-dimensional depth measurement.

Description

technical field [0001] The invention relates to a method for calibrating camera parameters, in particular to a method for calibrating parameters of a focused light field camera based on Gaussian optics. Background technique [0002] With the development of optical and electronic manufacturing technology and computational imaging technology, light field cameras have gradually entered the field of life and scientific research. In terms of function, compared with traditional cameras, light field cameras can simultaneously record the intensity and propagation direction of light, that is, the collection of spatial light field information can be realized; the obtained data can be used for digital refocusing, 3D reconstruction, spatial depth acquisition, etc. In many ways. In terms of structure, compared with traditional cameras, light field cameras add a microlens array between the main lens and the sensor to collect light in the direction of light propagation. Depending on the ...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem that it is difficult to perform accurate image processing and calculation due to unknown internal parameters when the focused light field camera is applied to image measurement, and proposes a parameter calibration method for the focused light field camera based on Gaussian optics, so that it can Obtain the key parameters needed to study focused light field imaging techniques and light field image processing algorithms

Images