Patent ID: 6115503
Filing Date: 2000-09-05
Classification: H04N

Abstract:
A method for reducing coding artifacts of block-based image encoding methods, using a computer, comprising the steps of:implementing the following steps for picture elements of at least a part of a digitized, decoded image;checking for neighboring picture elements in said digitized decoded image at a same processing level without intervening filtering that are located in an environment of a picture element under investigation to see whether an amount of a difference between at least one of a brightness value and a color value of the picture element under investigation and a respective one of a brightness value and a color value of a neighboring picture element is below a predetermined threshold;taking the at least one of the brightness value and the color value of the neighboring picture element into consideration in determining at least one of a new brightness value and of a new color value of the picture element when one of the following conditions is met:an amount of the difference is lower than the predetermined threshold, andthe picture element under investigation and the neighboring picture element are located in different image blocks of the image; andderiving the at least one of the new brightness value and the new color value of the picture element by weighted averaging of at least the at least one of the brightness values and color values of the neighboring picture elements.