ONE-DIMENSIONAL TRANSFORM MODES AND COEFFICIENT SCAN ORDER

摘要

Methods and apparatus are provided for performing one-dimensional (ID) transform and coefficient scanning. An encoder may apply ID transform in either a horizontal or a vertical direction. The encoder may then determine a coefficient scan order based on the ID transform direction. The scan order may be determined to be in a direction orthogonal to the ID transform direction. The encoder may further flip the coefficients prior to scanning. The flipping may also be in a direction orthogonal to the ID transform direction. A decoder may receive indications from the encoder with respect to the ID transform, coefficient scanning, and/or coefficient flipping. The decoder may perform functions inverse to those performed by the encoder based on the indications.