Adaptive restoration for video coding
A coding system includes a decoding block and a reconstruction loop with first and second adaptive restoration blocks. The decoding block receives and decodes an encoded bitstream to derive residues, prediction information, and adaptive restoration information. The reconstruction loop reconstructs a current frame according to the residues and prediction information. The first adaptive restoration block performs restoration on a first set of processed data according to a first set of the adaptive restoration information, and the second adaptive restoration block performs restoration on an output of the first adaptive restoration block according to a second set of the adaptive restoration information.
1. A coding system comprising:
an inter prediction block, for performing prediction on blocks of a current frame and generating prediction information according to restored reconstructed samples of a reference frame;
a transform and quantization block, coupled to the inter prediction block, for performing transform and quantization processes on prediction residues;
a reconstruction loop, coupled between the transform and quantization block and the prediction block, for reconstructing the current frame according to outputs of the transform and quantization block and the inter prediction block to generate the restored reconstructed samples, the reconstruction loop comprising:
a first adaptive restoration block, for performing restoration on a first set of processed data; and
a second adaptive restoration block, for performing restoration on an output of the first adaptive restoration block, wherein the first and second adaptive restoration blocks generate adaptive restoration information; and
an encoding unit, coupled to the transform and quantization block and the first and second adaptive restoration blocks, for encoding the prediction information and adaptive restoration information to generate an encoded bitstream.
2. The coding system of claim 1 , wherein the reconstruction loop further comprises:
a deblocking unit, for performing deblocking to generate the first set of processed data.
3. The coding system of claim 1 , wherein the reconstruction loop further comprises:
a reference frame buffer, coupled to the second adaptive restoration block and the inter prediction block, for storing restored reconstructed samples output from the second adaptive restoration block.
4. The coding system of claim 1 , wherein the reconstruction loop further comprises:
an inverse transform and quantization block, coupled to the transform and quantization block, for performing inverse transform and quantization processes on an output of the transform and quantization block.
5. The coding system of claim 1 , wherein the first adaptive restoration block is enabled or disabled by comparing cost function results of enabling the first adaptive restoration block.
6. The coding system of claim 1 , wherein the second adaptive restoration block is enabled or disabled by comparing cost function results of enabling the second adaptive restoration block.
7. A coding system comprising:
a decoding block, receiving and decoding an encoded bitstream to derive residues, prediction information, and adaptive restoration information; and
a reconstruction loop, coupled to the decoding block, for reconstructing a current frame according to the residues and prediction information, wherein the reconstruction loop comprises:
a first adaptive restoration block, for performing restoration on a first set of processed data according to a first set of the adaptive restoration information; and
a second adaptive restoration block, for performing restoration on an output of the first adaptive restoration block according to a second set of the adaptive restoration information.
8. The coding system of claim 7 , wherein the reconstruction loop further comprises:
a deblocking unit, for performing deblocking to generate the first set of processed data.
9. The coding system of claim 7 , wherein the reconstruction loop further comprises:
a reference frame buffer, coupled to the second adaptive restoration block, for storing restored reconstructed samples output from the second adaptive restoration block.
10. The coding system of claim 7 , wherein the reconstruction loop further comprises:
an inverse transform and quantization block, coupled to the decoding block for performing inverse transform and quantization processes on the residues.
11. The coding system of claim 7 , wherein the first adaptive restoration block is enabled or disabled according to the adaptive restoration information.
12. The coding system of claim 7 , wherein the second adaptive restoration block is enabled or disabled according to the adaptive restoration information.