Optical digital mixed imaging system and method

Abstract

The invention relates to a system and a method for optical and digital mixed imaging. The system comprises an optical imaging object lens, a rational form wavefront coder, a photoelectrical detector and a digital image decoding and processing unit. The method adopts the rational form wavefront coder to code a wavefront phase of an incident light wave. Phi RPM(x) as an introduced phase distribution function is equal to sigma sign(x)an|x|(1+ sigma bm|x|), wherein x is a normalized radial coordinate; N and M are the highest power of a fraction and denominator polynomial respectively; {an} and {bm} are undetermined coefficients; and sign is a signum function. An intermediate blurred image which is not sensitive to defocusing is acquired on the photoelectrical detector after coding, and the digital image decoding and processing unit carries out deconvolution wave filtration on the intermediate blurred image to acquire the final clear image.

Description

technical field [0001] The invention relates to an optical-digital hybrid imaging (hereinafter referred to as "optical-digital imaging") system and method using a rational wavefront encoder, which is used for extending the focal depth of imaging and belongs to the technical field of photoelectric imaging. Background technique [0002] Usually, people hope that the optoelectronic imaging system has a large depth of focus to obtain larger imaging space and more object information, but due to the limitation of luminous flux, focal length, diffraction effect and other factors, the focal depth of optoelectronic imaging system is often insufficient. The optical digital imaging system using wavefront encoding technology encodes the wavefront phase of the incident light wave by adding a wavefront encoder to the optical system to obtain a blurred image that is not sensitive to defocus, and then uses digital image processing technology to correct the blurred image. Image decoding to g...

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Problems solved by technology

However, the superiority of these wavefront encoders needs to be considered. It is advisable to regard the phase distribution function introduced by the selected wavefront encoder as an approximation of the ideal phase distribution function to be obtained. The existing functions are simple in form, which limits range of feasible solutions, so they are hardly optimal

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