US 2012/0257702 A1 · ORDER OF DEBLOCKING

Abstract

The present invention relates to block-based video coding, in particular to methods for removing blocking artifacts in reconstructed video images. In conventional block-based video coding, both decoding and deblocking are performed on a block-by-block basis, which results in a plurality of dependencies between the various steps and processes. According to the present invention, deblocking is performed in batch mode after an entire frame has been decoded. Moreover, vertical and horizontal deblocking are separated in the sense that deblocking in the one direction is only performed after deblocking in the other direction is completed for the entire frame. In this manner, the decoding and deblocking processing can be split into a plurality of concurrent processes, which results in a highly efficient implementation both in hardware and in software.

Claims15

Dependent claims

A method for deblocking video data, comprising the steps of

receiving a frame of video data consisting of a plurality of blocks, each block consisting of a plurality of pixels;
applying a horizontal deblocking filter to each vertical edge between two horizontally adjacent blocks of video data;
and
applying a vertical deblocking filter to each horizontal edge between two vertically adjacent blocks of video data,
wherein either the horizontal deblocking filter is applied to all vertical edges before the vertical deblocking filter is applied to a horizontal edge, or the vertical deblocking filter is applied to all horizontal edges before the horizontal deblocking filter is applied to a vertical edge.

2 more elements

A video decoder for decoding compressed video data comprising prediction error data, the video decoder comprising:

a prediction unit configured for predicting video data from previously decoded video data;
an adder for obtaining reconstructed video data by adding the prediction error data to the predicted video data;
a buffer memory for storing a frame of reconstructed video data consisting of a plurality of blocks, each block consisting of a plurality of pixels;
a first filter unit configured for applying a horizontal deblocking filter to each vertical edge between two horizontally adjacent blocks of video data;
and
a second filter unit configured for applying a vertical deblocking filter to each horizontal edge between two vertically adjacent blocks of video data;
wherein either the horizontal deblocking filter is applied to all vertical edges before the vertical deblocking filter is applied to a horizontal edge, or the vertical deblocking filter is applied to all horizontal edges before the horizontal deblocking filter is applied to a vertical edge.

4 more elements

Dependencies are inferred from the claim text.

Order of deblocking

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Order of deblocking

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Abstract

Claims15