ADAPTIVE LOOP FILTER WITH SAMPLES BEFORE DEBLOCKING FILTER AND SAMPLES BEFORE SAMPLE ADAPTIVE OFFSETS: abstract simplified (18181359)

Decoding video data involves processing and enhancing the quality of reconstructed video blocks. This device performs several steps to achieve this. First, it determines a pre-filtered reconstructed block of video data. Then, it applies either a deblocking filter or a sample adaptive offset filter (or both) to this pre-filtered block, resulting in a filtered reconstructed block. Next, an adaptive loop filter (ALF) is applied to the filtered block, producing a final filtered reconstructed block.

To apply the ALF, the device calculates a difference value by comparing the current sample value of the filtered block with the value of a neighboring sample from the pre-filtered block. A filter is then used on this difference value to determine a sample modification value. Finally, a final filtered sample value is determined based on this sample modification value.

In summary, this device decodes video data by applying various filters to reconstructed video blocks, ultimately improving the quality of the final filtered reconstructed block.