Fourier optical modeling-based coded aperture camera image restoration method

Abstract

The invention belongs to the digital image processing technical field and relates to a Fourier optical modeling-based coded aperture camera image restoration method. In order to decrease dependence on actual photographing and reduce noise error introduced by manual photographing, the imaging mode of a coded mask optical imaging system is quantitatively analyzed, and finally, the point spread function of a coded aperture camera can be obtained, and the point spread function is adopted as prior data to restore an image. According to the technical scheme of the invention, the Fourier optical modeling-based coded aperture camera image restoration method includes the following steps that: (1) a coded mask imaging system is quantitatively analyzed, and the coded mask imaging system generates a simulation point diffusion function of a coded aperture camera under arbitrary depths; and (2) with the point diffusion function under arbitrary depths in the step (1) adopted as a fuzzy kernel, de-convolution is performed on scene images photographed by the same coded aperture camera, and a simulation result is optimized according to a maximum posterior probability MAP principle, and the image of the original scene can be obtained. The Fourier optical modeling-based coded aperture camera image restoration method of the invention is mainly applied to digital image processing.

Description

technical field [0001] The invention belongs to digital image processing, and in particular relates to a method for obtaining a coded aperture diffraction point spread function through Fourier optical modeling and a method for obtaining clear imaging based on the point spread function. Background technique [0002] Coded mask imaging technology first originated in the detection and imaging of heavy particle rays such as X-rays. A coded mask with a certain pattern structure is used to modulate the heavy particle rays arriving at the detection system, and the detection results need to be matched with corresponding The image decoding technique of the original heavy particles is used to restore and image the radiation source scene of the original heavy particles (E.E.Fenimore, and T.M.Cannon, "Coded aperture imaging with uniformly redundant arrays," Appl Optics 17, 337-347(1978)). [0003] Today, coded mask imaging technology has been widely used in visible light imaging, infrar...

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the current point spread function can be obtained by actual shooting measurement and interpolation methods. These methods are more or less based on real shooting results, and will introduce environmental noise, which will affect the accuracy of the prior point spread function and the restoration of the image. Resolution makes a difference

Images