DE-RINGING FILTER FOR DECOMPRESSED VIDEO DATA

A post processing apparatus of a graphics controller to filter decompressed video data. An embodiment of the apparatus includes a buffer and a de-ringing filter. The buffer is configured to read a pixel line of video data from memory. The pixel line includes pixels from adjacent macroblocks of the video data. The de-ringing filter is coupled to the buffer. The de-ringing filter is configured to identify a maximum pixel jump between adjacent pairs of pixels in the pixel line and to apply a de-ringing filter to a pixel within a pixel subset of the pixel line in response to a determination that the pixel is not an edge pixel. The determination that the pixel is not an edge pixel is based on the identified maximum pixel jump.