Detector pixel response Fourier spectrum acquisition-based image reconstruction method

Abstract

The present invention relates to a detector pixel response Fourier spectrum acquisition-based image reconstruction method. The method includes the following steps that: four-step phase shifting sinusoidal fringe lighting is performed on an array detector, and four-step phase shifting sinusoidal fringe images are acquired; a plurality of frames of sinusoidal fringe images are acquired in phase shifting each time, corresponding dark field images are acquired under the same condition, the number of the frames of the dark field images is constantly consistent with the number of the frames of the sinusoidal fringe images; the four-step phase shifting sinusoidal fringe images are preprocessed; fringe inclination and fringe spacing are changed, the previous steps are repeated until the spatial frequency of the four-step phase shifting sinusoidal fringe images covers the spectrum range of the pixel response function of the array detector; the four-step phase shifting sinusoidal fringe images are utilized to calculate the frequency-domain pixel response function of the detector array; the frequency-domain pixel response function is utilized to solve the spatial spectrum of an incident light field; and inverse Fourier transformation is performed on the spatial spectrum of the incident light field, so that the intensity distribution of the incident light field is obtained.

Description

technical field [0001] The invention relates to the fields of image sensor calibration and digital image acquisition and processing, in particular to an image reconstruction method based on detector pixel response Fourier spectrum acquisition. Background technique [0002] Image sensors are used more and more widely in today's society, such as digital cameras, mobile phone cameras, remote sensing satellites, astronomical telescopes and so on. It is well known that the non-uniformity of the spatial response of the solid-state image sensor affects the point spread function of the image sensor, thereby affecting the imaging quality. The spatial response of any array detector which is invariant to spatial translation can be expressed by point spread function and modulation transfer function in real domain space and frequency domain space respectively, and these two representations are equivalent. Discretely sampled array detectors will destroy this spatial translation invarianc...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the existing pixel response function measurement method is not suitable for practical engineering applications, thereby providing an image reconstruction method based on frequency domain spatial measurement of pixel response

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