Patent ID: 7576891

Claim:
An apparatus for improving an image quality of an image sensor, the apparatus comprising: a first converting unit for converting an RGB color data obtained from bayer data through a de-mosaicking into a YCbCr color data; a noise removal unit for removing a noise of a Cb and a Cr color data outputted from the first converting unit, and for determining a threshold value to be used during a filtering process by using data located at a center from the Cb and the Cr color data outputted from the first converting unit; and a second converting unit for converting Cb and Cr color data outputted from the noise removal unit, and a Y color data from the first converting unit, into the RGB color data, wherein when a statistical characteristic of noise added to adjacent pixels follows a Gaussian distribution, a minimum threshold value is equal to ‘P 5 −3×σ’ and a maximum threshold value is equal to ‘P 5 +3×σ’ with respect to a standard deviation (σ) obtained by calculating deviations of the pixels, where P 5 represents a data value of a pixel disposed at the center.