Patent Document ID: 8780987
Application ID: 13095967
Patent Status: 1

Claim One:
1. A method for encoding a video signal, the video signal having at least one frame with a plurality of blocks having pixels, comprising: identifying a prediction mode for a block in the at least one frame; determining a residual for the block using the prediction mode, the residual having an original resolution; determining a variance based on the residual; when the variance is greater than a predetermined value, reducing the original resolution of the residual to a lower resolution using a processor, wherein the predetermined value is a value at an intersection of a first curve and a second curve, the first curve representative of a peak signal-to-noise ratio value and a variance value for each block in a test sequence calculated at the original resolution and the second curve representative of a peak signal-to-noise value and a variance value for each block in the test sequence calculated at lower resolution; and encoding the residual.