Method and apparatus for eliminating defective pixels and noise
AssigneeSamsung Electronics Co., Ltd.
InventorsMin-Kyu Park, Sung-Dae Cho
Life of this patent
Estimating the term…
Abstract
A method and apparatus for eliminating defective pixels and noise in which each pixel value of an image is extracted using a color filter. A mean value of the extracted image is calculated A noise variance, a first threshold for determining whether a pixel is defective, and a second threshold for calculating a weight value for a pixel are all estimated from the mean value. There is a determination as to whether each pixel is defective, and a weight value, a weighted signal mean and a weighted signal variance of the each pixel are all calculated, and noise eliminated from the image using the noise variance, the weighted signal mean, and the weighted signal variance.
Claims17
A method for eliminating defective pixels and noise in an image sensor, comprising:
- extracting each pixel value of an image using a color filter;
- calculating a mean value of the extracted image;
- estimating a noise variance, a first threshold for determining whether a pixel is defective, and a second threshold for calculating a weight value for a pixel, from the mean value;
- determining whether each pixel is defective;
- calculating a weight value for the each pixel and calculating a weighted signal mean and a weighted signal variance of each pixel;
- and
- eliminating noise from the image using the noise variance, the weighted signal mean, and the weighted signal variance.
An apparatus for eliminating defective pixels and noise in an image sensor, comprising:
- means for extracting each pixel value of an image using a color filter;
- means for calculating a mean value of the extracted image;
- means for estimating a noise variance, a first threshold for determining whether a pixel is defective, and a second threshold for calculating a weight value for a pixel, from the mean value;
- means for determining whether each pixel is defective;
- means for calculating a weight value for the each pixel and calculating a weighted signal mean and a weighted signal variance of each pixel;
- and
- means for eliminating noise from the image using the noise variance, the weighted signal mean, and the weighted signal variance.
Dependencies are inferred from the claim text.