Method and apparatus for encoding and decoding image by using filtered prediction block
A prediction block of a current block is created by performing intra prediction or inter prediction on the current block. The prediction block is filtered by using a predetermined filter. The current block is encoded based on the filtered prediction block. A compression rate of image encoding may be substantially improved by more accurately performing a prediction encoding.
1. A method of encoding an image comprising:
creating a prediction block of a current block by performing one of intra prediction and inter prediction on the current block;
determining n filters from a natural image based on a predetermined model;
filtering the prediction block and pixels adjacent to the prediction block and included in a previously encoded region which is adjacent to the current block, to remove blocking artifacts from the prediction block, with the n filters, to obtain a filtered prediction block; and
encoding the current block based on the filtered prediction block,
wherein the natural image is comprised of a number of patterns,
the number of n filters corresponds to the number of patterns in the natural image, and
the filtering comprises repeatedly filtering the prediction block and the adjacent pixels with the n filters.
2. The method of claim 1 , wherein the n filters comprise at least one of a 3×3 filter and a 5×5 filter.
3. A non-transitory computer-readable recording medium having recorded thereon a computer program which, when executed by a computer, causes the computer to execute the method of claim 1 .
4. A method of decoding an image comprising:
creating a prediction block of a current block by performing one of intra prediction and inter prediction on the current block;
determining n filters from a natural image based on a predetermined model;
filtering the prediction block and pixels adjacent to the prediction block and included in a previously decoded region which is adjacent to the current block, to remove blocking artifacts from the prediction block, with the n filters, to obtain a filtered prediction block; and
restoring the current block by adding the filtered prediction block to a residual block of the current block,
wherein the natural image is comprised of a number of patterns,
the number of n filters corresponds to the number of patterns in the natural image, and
the filtering comprises repeatedly filtering the prediction block and the adjacent pixels with the n filters.
5. The method of claim 4 , wherein the n filters comprise at least one of a 3×3 filter and a 5×5 filter.
6. A non-transitory computer-readable recording medium having recorded thereon a computer program which, when executed by a computer, causes the computer to execute the method of claim 4 .
7. An apparatus for encoding an image comprising:
a prediction unit configured to create a prediction block of a current block by performing one of intra prediction and inter prediction on the current block;
a preprocessing unit configured to filter the prediction block and pixels adjacent to the prediction block and included in a previously encoded region which is adjacent to the current block, to remove blocking artifacts from the prediction block, with n filters determined from a natural image, and obtain a filtered prediction block; and
an encoding unit configured to encode the current block based on the filtered prediction block,
wherein the n filters are determined from the natural image based on a predetermined model,
the natural image is comprised of a number of patterns,
the number of n filters corresponds to the number of patterns in the natural image, and
the preprocessing unit repeatedly filtering the prediction block and the adjacent pixels with the n filters.
8. The apparatus of claim 7 , wherein the n filters comprise at least one of a 3×3 filter and a 5×5 filter.
9. An apparatus for decoding an image comprising:
a prediction unit configured to create a prediction block of a current block by performing one of intra prediction and inter prediction on the current block;
a preprocessing unit configured to filter the prediction block and pixels adjacent to the prediction block and included in a previously decoded region which is adjacent to the current block, to remove blocking artifacts from the prediction block, with n filters determined from a natural image, and obtain a filtered prediction block; and
a restoring unit configured to restore the current block with the filtered prediction block to a residual block of the current block,
wherein the n filters are determined from the natural image based on a predetermined model,
wherein the natural image is comprised of a number of patterns,
the number of n filters corresponds to the number of patterns in the natural image, and
the preprocessing unit repeatedly filtering the prediction block and the adjacent pixels with the n filters.
10. The apparatus of claim 9 , wherein the n filters comprise at least one of a 3×3 filter and a 5×5 filter.