Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2001-10-11
2004-12-28
Le, Vu (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240190
Reexamination Certificate
active
06836512
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to video encoding and more specifically to spatial, or resolution, scalability for fine granular scalability encoded video signals.
BACKGROUND OF THE INVENTION
The flexibility of a Fine-Granular Scalability (FGS) video encoding enables it to support a wide range of transmission bandwidths as is described in U.S. patent application Ser. No. 09/347,882, entitled “System and Method for Improved Fine Granular Scalable Video Using Base Layer Coding Information” filed on Jul. 6, 1999, and assigned to the assignee herein. An improved FGS video encoding method is disclosed in U.S. patent application Ser. No. 09/590,825, entitled “Hybrid Temporal-SNR Fine Granular Scalability Video Coding,” filed on Jun. 9, 2000 and assigned to the assignee herein. In the hybrid temporal-SNR FGS video encoding method disclosed, an encoder is operable to encode and transmit video images with improved quality, referred to herein as SNR, FGS encoded form, or with improved temporal form or in a combined hybrid temporal-SNR FGS form.
However, in the current FGS framework there is no ability to alter the image resolution (i.e., spatial scalability) to conform to different resolutions, such as QCIF or CIF. The addition of spatial scalability to FGS encoding would be advantageous as the current FGS encoding system limits the transmission bandwidth range due to the predefined spatial resolution at encoding time. Since variable bandwidth networks, such as the Internet, have bandwidths, or bit rates, that vary widely and are generally unknown at encoding time, the current system does not adapt to the varying bandwidth and, hence, is not adequate for variable bandwidth network video transmission.
Hence, there is a need for a spatial scalability structure with the current FGS encoding system that allows for a wider range of transmission bit rates to be satisfied.
SUMMARY OF THE INVENTION
A method for coding video data to allow for scalability of image resolution comprising downscaling the video data image frames, encoding the downscaled video data to produce base layer frames, generating quality enhanced residual images from the downscaled video data and said encoded data in said base layer frame, encoding said quality enhanced residual images using a fine granular coding technique to produce quality enhancement frames, upscaling the encoded data contained in the base layer frames and corresponding quality enhanced residual frames, generating a first set of residual images from the upscaled base layer, and corresponding quality enhancement layer frame data and the video data, encoding this first set of residual images using a fine granular coding technique to produce spatial enhancement frames. In another aspect of the invention, a second temporal enhancement frame information is produced from among the information contained in the encoded spatial enhancement layer frames.
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Wu et al, “DCT-prediction based progressive fine granularity scalable coding”, International Conference on Image Processing, IEEE, vol. 3, pp.556-559, Sep. 10-13, 2000.*
Li et al, “Fine granularity scalability in MPEG-4 for streaming video”, IEEE International Symposium on Circuits and Systems, vol. 1, pp.299-302, May 28-31, 2000.
Balakrishnan Mahesh
Van Der Schaar Mihaela
Koninklijke Philips Electronics , N.V.
Le Vu
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