METHOD OF SPACE-TIME ANISOTROPIC BILATERAL FILTRATION OF VIDEO SIGNALS Russian patent published in 2009 - IPC G06K9/40 

FIELD: information technology.

SUBSTANCE: present invention relates to methods and devices for processing video signals and images, and particularly to methods and devices for suppressing noise in video signals and images. The method involves selecting the first region around the current pixel; selecting two lines (horizontal and vertical) through the current pixel and pixels in the region of the current pixel; determining the horizontal gradient; determining the vertical gradient; determining the correlation matrix for the horizontal and vertical gradients, as well as eigenvectors and eigen values of the correlation matrix; determining the number of contours; determining direction of the object contour into the image; calculating weighted coefficients of the time filter; calculating adaptation coefficients of the time and bilateral filters to the power of contours, carrying out time filtering; determining the second region; dividing the second region into two sub-regions along the direction of the contour; carrying out bilateral filtration for the first and second sub-regions; calculating the result of bilateral filtration as a weighted sum of results of filtering the first and second sub-ranges; carrying out approximation of the current pixel using pixels located along the direction of the contour; calculating the final result of filtration as a weighted sum of results of bilateral filtration and approximation along the contour.

EFFECT: wider functionality and improved quality of suppressing different types of noises.

5 cl, 2 dwg