Patent ID: 7805016
Filing Date: 2010-09-28
Classification: H04N

Abstract:
1. A decoding apparatus comprising: a decoder configured to obtain image data from an encoded image data by orthogonal transformation decoding; a de-ringing filter configured to filter the image data, wherein the de-ringing filter includes, a vertical de-block filter configured to calculate an absolute difference value between each unit of two neighboring pixels along a vertical pixel line crossing a horizontal block boundary of the image data, to count a number of units of which the absolute difference value is less than a second threshold, to decide whether the number of the units is less than a third threshold, and to partially correct values of pixels on the vertical pixel line based on the decision result; and a horizontal de-block filter configured to calculate an absolute difference value between each unit of two neighboring pixels along a horizontal pixel line crossing a vertical block boundary of the image data, to count number of units of which the absolute difference value is less than the second threshold, to decide whether the number of the units is less than the third threshold, and to partially correct values of pixels on the horizontal pixel line based on the decision result.