Method and apparatus for low-complexity spatial scalable decoding

• US 20060193384A1
• Filed: 06/17/2004
• Published: 08/31/2006
• Est. Priority Date: 06/19/2003
• Status: Abandoned Application

• Current Assignee: Thomson Licensing (Vantiva SA)
• Original Assignee: Thomson Licensing (Vantiva SA)
• Inventors: Boyce, Jill MacDonald
• Application Number:
  US10/560,499
• Publication Number:
  US 20060193384A1
• Time in Patent Office: Days
• US Class Current: 375/240.12
• CPC Class Codes: H04N 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• CPC Class Codes: H04N 19/33 in the spatial domain
• CPC Class Codes: H04N 19/59 involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

A video decoder and method for low-complexity spatial scalable video are disclosed, the decoder for receiving compressed high-resolution scalable and standard-resolution bitstreams and providing high-resolution video, and including an I-picture detector for receiving the compressed standard-resolution bitstream, a standard-resolution Intra decoder coupled with the I-picture detector for decoding I-pictures, a high-resolution video decoder for receiving the compressed high-resoluction scalable bitstream, and a selector coupled with the standard-resolution Intra video decoder and the high-resolution video decoder for selecting between the outputs from the standard-resolution Intra video decoder and the high-resolution video decoder to provide the high-resolution video sequence.

Claims

1. A spatial scalable video decoder for receiving each of a standard-resolution bitstream and a high-resolution scalable bitstream and providing a high-resolution video sequence, the decoder comprising:

an I-picture detector for receiving the standard-resolution bitstream;

a standard-resolution Intra decoder in signal communication with the I-picture detector for decoding I-pictures;

a high-resolution video decoder for receiving the high-resolution scalable bitstream; and

a selector in signal communication with the standard-resolution Intra video decoder and the high-resolution video decoder for selecting between the outputs from the standard-resolution Intra video decoder and the high-resolution video decoder to provide the high-resolution video sequence.

2. A decoder as defined in claim 1, further comprising an I-picture indicator in signal communication between the standard-resolution Intra decoder and the selector.

3. A decoder as defined in claim 1, further comprising an I-picture selector in signal communication with the I-picture detector.

4. A decoder as defined in claim 1, further comprising an upsampler in signal communication with the standard-resolution Intra decoder.

5. A decoder as defined in claim 1, further comprising a summing unit in signal communication with the high-resolution decoder.

6. A decoder as defined in claim 1, further comprising high-resolution frame stores in signal communication with the high-resolution decoder.

7. A decoder as defined in claim 6 wherein the high-resolution resolution frame stores is in signal communication with the selector for receiving the high-resolution video sequence.

8. A decoding method for providing spatial scalable decoded video data, the method comprising:

receiving a standard-resolution bitstream;

receiving a high-resolution scalable bitstream;

Intra decoding I-pictures from the standard-resolution bitstream;

up-sampling the decoded I-picture to high-resolution;

high-resolution decoding a current picture from the high-resolution scalable bitstream; and

summing the decoded current picture with the up-sampled I-picture.

9. A decoding method as defined in claim 8, further comprising:

selecting one of the decoded current picture and the summed picture in response to an indication of the presence of an I-picture; and

outputting the selected picture in a high-resolution video sequence.