Patent ID: 8767092

Claim:
An image restoration device for producing a restoration image having an extended depth of field, by restoring a sweep image which is captured by an imaging device and is subjected to focus sweep during exposure on an area, between focal points in an image space, which corresponds to a sweep range including a desirable distance range to be desirably focused, by driving the imaging device or a lens which collects light to the imaging device, the image restoration device comprising: a point spread function (PSF) storage unit configured to store any two PSFs among (i) a first PSF to be used for restoring a first sweep image serving as the sweep image when the sweep range is a first range, (ii) a second PSF to be used for restoring a second sweep image serving as the sweep image when the sweep range is a second range which excludes the first range, and (iii) a third PSF to be used for restoring a third sweep image serving as the sweep image when the sweep range is a third range obtained by combining the first range and the second range; a PSF calculation unit configured to perform addition or subtraction on the two PSFs to calculate a remaining one among the first PSF, the second PSF, and the third PSF; an image restoration unit configured to (i) restore the first sweep image using the first PSF to produce the restoration image, (ii) restore the second sweep image using the second PSF to produce the restoration image, and (iii) restore the third sweep image using the third PSF to produce the restoration image.