Imaging device and image restoration method

Abstract

Disclosed is an imaging device that can restore degraded images to a high resolution when restoring degraded images on the basis of a point spread function (PSF) image that has been imaged by an optical system. The imaging device (10) has: an optical system (1); a PSF imaging unit (2) that acquires PSF information imaged by the optical system (1) and outputs corrected PSF information; a subject imaging unit (4) that acquires and outputs subject information imaged by the optical system (1); and an image restoration unit (5) that performs a restoration computation of the subject information on the basis of the corrected PSF information and the subject information. The PSF imaging unit (2) outputs corrected PSF information by subtracting, from the PSF information, correction brightness values that are greater by a brightness value (Is) than the brightness values (Nf) of fixed-value noise that does not vary chronologically.

Description

technical field [0001] The present invention relates to a technique for restoring an image degraded at the time of shooting to an image with little degradation. Background technique [0002] There is progress in the development of technologies for restoring images degraded by optical system misfocus, shake, or aberrations during shooting to images with less degradation. For example, in the technique disclosed in Patent Document 1, by performing a restoration operation using a correction function on a degraded image (captured image) degraded due to misfocus, blur, aberration, etc., a degeneration-corrected restoration can be obtained. For an image, this correction function has an inverse characteristic of a PSF (Point Spread Function: Point Spread Function) based on misfocus, blur, or aberration. In many cases, the correction function is created using PSF data created by a computer based on design data or the like. [0003] Furthermore, in the technique disclosed in Patent ...

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Problems solved by technology

[0007] In addition, as shown in Patent Document 2, even when the restoration calculation of the degraded image is performed using the PSF image obtained by capturing the point light source instead of the PSF data created by the computer, especially when the PSF image is captured, the When the unnecessary luminance of the element (hereinafter also referred to as "noise") is large, there is a difference between the PSF shown in the PSF image and the actual PSF due to the influence of the noise

As a result, there is a problem that a high-resolution restored image cannot be obtained

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