Methods and apparatus for motion compensation with smooth reference frame in bit depth scalability

Abstract

Methods and apparatus are provided for motion compensation with a smooth reference frame in bit depth scalability. An apparatus includes an encoder (100) for encoding picture data for at least a portion of a picture by generating an inter-layer residue prediction for the portion using an inverse tone mapping operation performed in the pixel domain for bit depth scalability. The inverse tone mapping operation is shifted from a residue domain to the pixel domain.

Description

[0001] References to related applications [0002] This application claims priority to US Provisional Patent Application Serial No. 61 / 149,495, filed February 3, 2009, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates generally to encoding and decoding of video, and more particularly to methods and apparatus for motion compensation using smooth reference frames in bit-depth scalability. Background technique [0004] Currently, digital images / videos with a bit depth greater than 8 bits are required by many application fields, such as medical image processing, digital cinema workflow in production and post-production, home theater related applications, and so on. At some point in the future, both traditional 8-bit depth graphics systems and high bit depth graphics systems will co-exist. Considering this situation, bit depth scalability (bit depth scalability) will be useful. There are many ways to handle the coe...

AI Technical Summary

Problems solved by technology

The first existing solution itself is the International Organization for Standardization / International Electrotechnical Commission (ISO / IEC) Moving Picture Experts Group-4 (MPEG-4) Part 10 Advanced Video Coding (Advanced Video Coding, AVC) / International Telecommunication Union, Telecommunications Department (ITU-T) H.264 recommendation (referred to as "MPEG-4AVC standard" in the afternoon) 8-bit profile (profile) is not compatible

The second existing solution is compatible with existing standards, but requires more overhead

[0018] However, all of the above existing solutions are imperfect

For example, a third existing method cannot handle different bit depths in the enhancement layer and the base layer due to the lack of tone mapping and inverse tone mapping operations

In addition, for the fourth existing method, there is still room for improvement in the accuracy of enhancement layer prediction

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