ADAPTIVE TRANSFER FUNCTION FOR VIDEO ENCODING AND DECODING

摘要

A video encoding and decoding system that implements an adaptive transfer function method internally within the codec for signal representation. A focus dynamic range representing an effective dynamic range of the human visual system may be dynamically determined for each scene, sequence, frame, or region of input video. The video data may be cropped and quantized into the bit depth of the codec according to a transfer function for encoding within the codec. The transfer function may be the same as the transfer function of the input video data or may be a transfer function internal to the codec. The encoded video data may be decoded and expanded into the dynamic range of display(s). The adaptive transfer function method enables the codec to use fewer bits for the internal representation of the signal while still representing the entire dynamic range of the signal in output.

主权项

1. A system comprising:
an encoder module configured to process video data according to an encoding format to generate encoded video data, wherein the video data is represented at a bit depth of C bits within the encoder module; and an adaptive transfer function module configured to:
receive input video data, wherein dynamic range of the input video data is represented according to a transfer function at a bit depth of N bits;determine a focus dynamic range for the input video data at least in part according to one or more characteristics of the input video data;map the input video data within the focus dynamic range from the bit depth of the input video data into the bit depth of the encoder module to generate C-bit video data; andoutput the C-bit video data to the encoder module for processing.