Patent ID: 8538118
Filing Date: 2013-09-17
Classification: A61B,G06T

Abstract:
1. A method of removing a moiré in a fluoroscopic X-ray image having both a defective pixel and the moiré appearing therein, comprising: a moiré frequency derivation step for determining frequency of the moiré that appears in the fluoroscopic X-ray image; a preliminary defective pixel complement step for complementing the defective pixel with reference to a pixel apart from the defective pixel by an integral multiple of one cycle of the moiré, thereby forming a first intermediate image having the defective pixel being preliminary complemented; a moiré removal step for conducting frequency analysis of the first intermediate image having the defective pixel being preliminary complemented and remove the moiré that appears in the first intermediate image, thereby forming a second intermediate image having the moiré removed therefrom; an image smoothing step for performing an image smoothing process to the first intermediate image having the defective pixel being preliminary complemented, thereby forming a third intermediate image to which an image smoothing process have been performed; and a final defective pixel complement step for recomplementing the defective pixel by replacing a pixel value of a pixel in a region as the defective pixel on the second intermediate image having the moiré removed therefrom with a pixel value of a pixel corresponding to the pixel on the third intermediate image.