INTER-COMPONENT DE-CORRELATION FOR VIDEO CODING

摘要

Cross-component prediction (CCP) and adaptive color transform (ACT) may be performed concurrently in a video coding system. CCP and ACT may be enabled/disabled at the same level (e.g. at the transform unit level) via an indicator signaled in the bitstream such as the ACT enable indicator for the CU. Inverse CCP and ACT may be operated at the same level (e.g. at the transform unit level). Prediction residuals may be converted to original color space without waiting for reconstruction of luma and chroma residuals of an entire prediction unit or coding unit. CCP and ACT transforms may be combined into one process to reduce encoding/decoding latency. Differences in dynamic ranges of color components may be compensated by variable dynamic range adjustments. Differences in bit depths between luma and chroma components may be compensated by selectively disabling the ACT coding tool, scaling a component output of the CCP, adjusting a quantization parameters (QPs) and/or shifting a component output of an inverse transform of the video coding system.

主权项

1. A video coding device comprising:
a processor configured to:
receive a coding unit (CU) comprising a first transform unit (TU) and a second TU;determine whether inverse adaptive color transform (ACT) is enabled for the first TU and whether inverse ACT is enabled for the second TU; andprocess the first TU and the second TU based on the determination, wherein a first inverse color transform is applied for the first TU when ACT is enabled for the first TU, and a second inverse color transform is skipped for the second TU when ACT is not enabled for the second TU.