Video compression and encoding method
Disclosed herein is a method for encoding a video signal having at least one frame with a plurality of blocks including a current block, including generating, for at least a selected pixel in the current block, a predicted value for at least one pixel located in a row i and a column j of the current block using a processor and according to the following equation: X ij =L i +A j −C; wherein X ij is the predicted value, L i is the value of a pixel to the left of the current block, A j is the value of a pixel in a row above the current block and C is the value of a pixel in the row above and the column to the left of the current block and encoding the current block using the predicted value.
1. A method for encoding a video signal having at least one frame with a plurality of blocks including a current block, comprising:
generating, for at least a selected pixel in the current block, a predicted value for at least one pixel located in a row i and a column j of the current block using a processor and according to the following equation:
X ij =L i +A j −C;
wherein X ij is the predicted value, L i is the value of a pixel to the left of the current block, A j is the value of a pixel in a row above the current block and C is the value of a pixel in the row above and the column to the left of the current block; and
encoding the current block using the predicted value.
2. The method of claim 1 , wherein L i is the value of the pixel in the row in the column to the left of the current block.
3. The method of claim 1 , wherein A j is the value of the pixel in the column j in the row above the current block.
4. The method of claim 1 , wherein the column to the left of the current block is adjacent to the current block.
5. The method of claim 1 , wherein the row above the current block is adjacent to the current block.
6. The method of claim 1 , wherein the pixels corresponding to the values L i , A j , and C are previously decoded pixels.
7. The method of claim 1 , wherein the equation corresponds to a first coding mode in a set of coding modes and wherein each coding mode in the set is indicative of a different prediction mode for generating predicted values.
8. The method of claim 7 , wherein the set of coding modes includes at least a second coding mode, further comprising:
generating, for the selected pixel in the current block, an alternative predicted value using the second coding mode;
determining a first metric for coding the current block using the predicted value;
determining a second metric for coding the current block using the alternative predicted value;
selecting one of the predicted value and the alternative predicted value based on the determined first and second metrics.
9. The method of claim 8 , wherein the first and second metrics are at least one of cost or error.
10. The method of claim 8 , wherein selecting one of the predicted value and the alternative predicted value comprises:
selecting the predicted value if the first metric is less than the second metric; and
selecting the alternative predicted value if the second metric is less than the first metric.
11. The method of claim 7 , wherein one of the following equations corresponds to the second coding mode:
X ij =( L i−1 +2 L i +L i+1 +2)/4; and
X ij =( A j−1 +2 A j +A j+1 +2)/4.