Method and apparatus for improved coding mode selection

A technology of encoding mode and encoding method, applied in the field of multimedia compression system, can solve the problems of slow development and achieve the effect of bit rate reduction

Inactive Publication Date: 2006-03-29
APPLE INC
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[0005] However, the video medium has evolved more slo...

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  • Method and apparatus for improved coding mode selection

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Embodiment Construction

[0019] The present invention discloses methods and systems for improved coding mode selection. In the following description, for convenience of explanation, specific terms are set forth to provide a complete understanding of the present invention. It will be apparent, however, to one skilled in the art that these specific details are not required to practice the present invention.

[0020] The emerging H.264 video coding standard, also known as MPEG4 / Part 10, Joint Video Team (JVT), Advanced Video Coding (AVC), and H.26L, has been endorsed by the Moving Picture Experts Group (MPEG) and the International Telecommunication Union ( ITU) jointly developed to provide a higher compression of moving pictures than a state-of-the-art video coding system compatible with the existing MPEG standard. Target applications for H.264, which is expected to become an international standard in 2003, include, but are not limited to, video conferencing, digital storage media, television broadcasti...

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Abstract

In this disclosure, a novel method for direct mode enhancement in B-pictures and skip mode enhancement in P-pictures in the framework of H.264 (MPEG-4/Part 10) is disclosed. Direct mode and skip mode enhancements are achieved by clustering the values of the Lagrangian, removing outliers and specifying smaller values of the Lagrangian multiplier in the rate-distortion optimization for encoding mode selection. Experimental results using high quality video sequences show that bit rate reduction is obtained using the method of the present invention, at the expense of a slight loss in peak signal-to-noise ratio (PSNR). By conducting two different experiments, it has been verified that no subjective visual loss is visible despite the peak signal-to-noise ratio change. In relationship to the existing ratedistortion optimization methods currently employed in the (non-normative) MPEG4/Part 10 encoder, the method of the present invention represents a simple and useful add-on. More importantly, when other solutions such as further increasing the values of the quantization parameter are not applicable, as inadmissible artifacts would be introduced in the decoded pictures, the method of the present invention achieves bit rate reduction without introducing visible distortion in the decoded sequences. Even more, despite the fact that the present document makes use of the H.264 framework, the proposed method is applicable in any video encoding system that employs ratedistortion optimization for encoding mode selection.

Description

[0001] related application [0002] This patent application claims priority to US Provisional Patent Application Serial No. 60 / 439062, published on January 8, 2003, entitled "METHOD AND APPARATUS FOR IMPROVED CODING MODE SELECTION". technical field [0003] The invention relates to the field of multimedia compression systems. In particular, the present invention discloses methods and systems for improved coding mode selection. Background technique [0004] Digital-based electronic media formats are finally replacing analog electronic media formats on a large scale. Digital compact discs (CDs) replaced analog vinyl records a long time ago. Analog tapes are becoming increasingly rare. Second and third generation digital audio systems, such as minidisc and MP3 (MPEG Audio Layer 3) are taking market share from the first generation digital audio compact disc format. [0005] However, the video medium has evolved more slowly than audio into digital storage and transmission for...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N19/103H04N19/147H04N19/176H04N19/19H04N19/52H04N19/61
Inventor A·杜米特拉斯B·G·哈斯克尔A·普里
Owner APPLE INC
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