Patent ID: 9014506
Filing Date: 2015-04-21
Classification: G02B,G06T,H04N

Abstract:
1. An image processing method configured to denoise three-dimensional image data of an object captured at a plurality of different positions in an optical axis direction of an image-pickup optical system, the image processing method comprising: an image transform step of performing a frequency transform for the three-dimensional image data in the optical axis direction and of calculating three-dimensional transformed image data; an image modulation step of reducing an absolute value of the three-dimensional transformed image data in a specific frequency region and of calculating three-dimensional modulated image data; and an inverse image transform step of performing an inverse frequency transform corresponding to the frequency transform for the three-dimensional modulated image data in the optical axis direction and of calculating three-dimensional inversely transformed image data, wherein the specific frequency region is a part of a region expressed by the following conditional expression: where f z is a spatial frequency in the optical axis direction, NA is the object-side numerical aperture of the image-pickup optical system, and A is a wavelength of light from the object.