Video decoding apparatus and method

• US 20050002646A1
• Filed: 04/27/2004
• Published: 01/06/2005
• Est. Priority Date: 04/28/2003
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sato, Kazushi
• Granted Patent: US 7,630,443 B2
• Time in Patent Office: Days
• US Class Current: 386/269
• CPC Class Codes: G11B 27/002 Programmed access in sequence to a plurality of record carriers or indexed parts, e.g. tracks, thereof, e.g. for editing; transfer of record carriers from magazine G11B15/68, G11B17/10; G11B17/22
• CPC Class Codes: H04N 19/112 according to a given display mode, e.g. for interlaced or progressive display mode
• CPC Class Codes: H04N 19/117 Filters, e.g. for pre-processing or post-processing sub-band filter banks H04N19/635
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/162 User input
• CPC Class Codes: H04N 19/172 the region being a picture, frame or field
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/527 Global motion vector estimation
• CPC Class Codes: H04N 5/783 Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 9/8042 involving data reduction

Abstract

A video decoding apparatus and method capable of performing high-speed reproduction of image data subjected to coding with a prescribed coding scheme for adaptively performing field-structured or frame-structured coding, with a simple configuration. In a high-speed reproduction mode, a decoding process is applied to only coded image data of intra-frame coded pictures subjected to the frame-structured coding or of one field in the intra-frame coded pictures and coded image data of intra-field coded pictures subjected to the field-structured coding.

Claims

1. A video decoding apparatus for performing a decoding process on coded image data comprising image data subjected to coding with a prescribed coding scheme for adaptively performing field-structured coding or frame-structured coding, the video decoding apparatus comprising:

decoding means for performing the decoding process on the coded image data; and

control means for controlling the decoding means, wherein

the control means controls, in a high-speed reproduction mode, the decoding means so as to perform the decoding process on only the coded image data of intra-frame coded pictures subjected to the frame-structured coding or of one field in the intra-frame coded pictures and the coded image data of intra-field pictures subjected to the field-structured coding.

2. The video decoding apparatus according to claim 1, further comprising

filtering means for performing a prescribed filtering process on decoded image data obtained by performing the decoding process on the coded image data, wherein

the control means controls, in the high-speed reproduction mode, the filtering means so as not to perform the filtering process on the decoded image data.

3. The video decoding apparatus according to claim 2, wherein

the filtering process is a deblock filtering process to reduce block noise.

4. The video decoding apparatus according to claim 1, further comprising

field/frame conversion means for taking as one field decoded image data obtained by performing the decoding process on the coded image data, and creating image data of a decoded picture by copying the decoded image data in the other filed.

5. A video decoding method for performing a decoding process on coded image data comprising image data subjected to coding with a prescribed coding scheme for adaptively performing field-structured coding or frame-structured coding, the video decoding method comprising,

in a high-speed reproduction mode, performing the decoding process on only the coded image data of intra-frame coded pictures subjected to the frame-structured coding or of one field in the intra-frame coded pictures and the coded image data of intra-field coded pictures subjected to the field-structured coding.

6. The video decoding method according to claim 5, wherein

a prescribed filtering process is applied to decoded image data obtained by performing the decoding process on the coded image data in a normal-speed reproduction mode, and the filtering process is not performed on the decoded image data in the high-speed reproduction mode.

7. The video decoding method according to claim 6, wherein

the filtering process is a deblock filtering process to reduce block noise.

8. The video decoding method according to claim 5, wherein

image data of decoded pictures is created by taking as a first field decoded image data obtained by performing the decoding process on the coded image data and copying the decoded image data in a second field.