Planar prediction mode
New intra planar modes are introduced for predicting digital video data. As part of the new intra planar modes, various methods are offered for predicting a first sample within a prediction unit, where the first sample is needed for referencing to when processing the new intra planar modes. And once the first sample is successfully predicted, the new intra planar modes are able to predict a sample of video data within the prediction unit by processing a bi-linear interpolation of four previously reconstructed reference samples.
1. A method for processing a video signal with a decoding apparatus, comprising:
receiving, with the decoding apparatus, the video signal, the video signal including a current prediction unit that includes a plurality of video data samples to be predicted;
predicting, with the decoding apparatus, a first video data sample included in the current prediction unit by referencing a first reference sample, a second reference sample, a third reference sample and a fourth reference sample,
wherein the first reference sample is a neighboring left sample of the current prediction unit having a same y-coordinate as the first video data sample, the second reference sample is a neighboring top sample of the current prediction unit having a same x-coordinate as the first video data sample, the third reference sample is a neighboring top-right sample of the current prediction unit, and the fourth reference sample is a neighboring bottom-left sample of the current prediction unit, and
wherein predicting the first video data sample comprises:
performing, with the decoding apparatus, a first linear interpolation of the first reference sample and the third reference sample;
performing, with the decoding apparatus, a second linear interpolation of the second reference sample and the fourth reference sample; and
averaging, with the decoding apparatus, a value resulting from the first linear interpolation and a value resulting from the second linear interpolation; and
reconstructing, with the decoding apparatus, the current prediction unit based on the first predicted video data sample.
2. The method of claim 1 , further comprising:
predicting, with the decoding apparatus, a second video data sample included in the current prediction unit by referencing only the third reference sample and the fourth reference sample, wherein the second video data sample is a bottom-right sample in the current prediction unit.
3. The method of claim 2 , wherein predicting the second video data sample comprises averaging the third reference sample and the fourth reference sample.