Non-zero rounding and prediction mode selection techniques in video encoding

A video encoder and encoding technology, applied in the field of video encoding, can solve problems such as not limiting the prediction direction of P frames or B frames

Active Publication Date: 2012-05-23
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Newer encoding formats and standards may not limit the prediction direction of P or B frames

Method used

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  • Non-zero rounding and prediction mode selection techniques in video encoding
  • Non-zero rounding and prediction mode selection techniques in video encoding
  • Non-zero rounding and prediction mode selection techniques in video encoding

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Embodiment Construction

[0027] This disclosure describes video encoding and decoding techniques that are applicable to bi-directional prediction. In bi-prediction, video blocks are predictively encoded and decoded based on two different lists of predictive reference data. In one aspect of the invention, rounding adjustments to bidirectional predictive data can be intentionally eliminated to provide predictive data lacking any rounding bias. In this case, both rounded and unrounded predictive data may be considered in a rate-distortion analysis to identify the best data for predicting a given video block. One or more syntax elements may be encoded to indicate the selection, and a decoder may interpret the one or more syntax elements in order to determine whether rounding should be used in the decoding process.

[0028] In another aspect of this disclosure, encoding techniques for selecting among default weighted prediction, implicit weighted prediction, and explicit weighted prediction are described....

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Abstract

In one aspect of this disclosure, rounding adjustments to bi-directional predictive data may be purposely eliminated to provide predictive data that lacks any rounding bias. In this case, rounded and unrounded predictive data may both be considered in a rate-distortion analysis to identify the best data for prediction of a given video block. In another aspect of this disclosure, techniques are described for selecting among default weighted prediction, implicit weighted prediction, and explicit weighted prediction. In this context, techniques are also described for adding offset to prediction data, e.g., using the format of explicit weighted prediction to allow for offsets to predictive data that is otherwise determined by implicit or default weighted prediction.

Description

[0001] The following co-pending and commonly-assigned applications are expressly incorporated herein by reference: Marta Karczewicz, Peisong Chen, and Yan Ye, Attorney Docket No. 082069U2, "Insufficient Zero Rounding and Prediction Mode Selection Techniques (Non-Zero Rounding And Prediction Mode Selection Techniques In Video Encoding)". technical field [0002] This disclosure relates to video coding, and more particularly, to video coding techniques using bi-directional prediction. Background technique [0003] Digital multimedia capabilities can be incorporated into a wide range of devices, including digital television, digital broadcast systems, wireless communication devices, wireless broadcast systems, personal digital assistants (PDAs), laptop or desktop computers, digital cameras, digital Recording devices, video game devices, video game consoles, cellular or satellite radiotelephones, digital media players, and the like. Digital multimedia devices may implement vide...

Claims

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Application Information

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IPC IPC(8): H04N7/36H04N7/46H04N7/26H04N7/50
CPCH04N19/00721H04N19/00781H04N7/462H04N7/26313H04N19/00715H04N19/00175H04N7/26154H04N7/50H04N7/366H04N19/00024H04N7/26015H04N19/00545H04N19/577H04N19/105H04N19/124H04N19/147H04N19/176H04N19/44H04N19/46H04N19/573H04N19/61H04N19/91
Inventor 马尔塔·卡切维奇陈培松叶琰
Owner QUALCOMM INC
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