Method and device for reducing image color noise
AssigneeSamsung Electronics Co., Ltd.
InventorsMin-Kyu Park, Han-Sae Song, Hee-Chan Park, Young-Kwon Yoon, Youg-Gu Lee
Life of this patent
Estimating the term…
Abstract
A device and method for reducing color noise of an image by using a distance weight depending on a distance from a central pixel for each pixel of an image and an edge weight depending on the difference in luminance and chrominance with the central pixel is provided, which can effectively reduce the color noise of the image by using the correlation between the luminance and the chrominance and edge characteristics.
Claims19
A method for reducing color noise of an input image, comprising:
- calculating, by a noise reduction device, a distance weight according to a distance from the coordinates of a central pixel to the coordinates of each pixel of the input image in a mask having a predetermined size;
- calculating, by the noise reduction device, an edge weight depending on a luminance and a chrominance between the central pixel and each pixel;
- calculating, by the noise reduction device, a weight mean of each pixel by using the calculated distance weight and the edge weight;
- correcting, by the noise reduction device, the luminance and the chrominance of each pixel by using the calculated weight mean;
- and
- storing, in a non-transitory memory, a noise-reduced image generated by the correction of the luminance and the chrominance of each pixel.
A device for reducing color noise of an input image, comprising:
- a noise reduction device calculating a distance weight according to a distance from the coordinates of a central pixel to the coordinates of each pixel of the input image in a mask having a predetermined size, calculating an edge weight depending on luminance and chrominance between the central pixel and each pixel, calculating a weight mean of each pixel by using the calculated distance weight and the edge weight, and correcting the luminance and the chrominance of each pixel by using the calculated weight mean;
- and
- a non-transitory memory storing a noise-reduced image generated by the correction of the luminance and the chrominance of each pixel.
An image photographing apparatus, comprising:
- an image photographing unit photographing images and converting them into image signals;
- an image signal processor processing the images into image signals including luminance and chrominance;
- a device for reducing color noise correcting luminance and chrominance of each pixel by using a distance weight depending on a distance from the coordinates of a central pixel to the coordinates of each pixel of an input image and an edge weight depending on a difference in luminance and chrominance between the central pixel and each pixel of the image;
- a display unit outputting an image signal from which color noise is reduced;
- and a storage unit storing the image signal from which color noise is reduced.
Dependencies are inferred from the claim text.