Patent ID: 8213738
Filing Date: 2012-07-03
Classification: G06T,H04N

Abstract:
1. A method for eliminating a noise from an image generated by an image sensor, the method comprising: setting a group of pixels arranged in a square matrix and including a central pixel intended to eliminate the noise in the image inputted from the image sensor and two or more peripheral pixels arranged around the central pixel; obtaining absolute difference values between a luminance value of the central pixel and a luminance value of the peripheral pixels according to directionalities of the peripheral pixels with respect to the central pixel; comparing each of the obtained absolute difference values with a first preset critical value to determine a region to which the central pixel belongs in the input image, wherein the region is one of: a contour region in which the central pixel is included in a contour; a noise region in which the central pixel is not included in the contour and having a lot of noise; and a flat region in which the central pixel is not included in the contour, and not having the noise; when the determined region is the contour region, eliminating a noise of the group of the pixels according to directionality of the contour; and when the determined region is the noise region, eliminating the noise of the group of the pixels according to a noise level of the group of the pixels; wherein the determination of the region to which the central pixel belongs comprises: when all of the absolute difference values are smaller than the first critical value, determining that the region to which the central pixel belongs is the flat region; when any of the absolute difference values is greater than the first critical value,