Coding compression method and coding compression apparatus

• US 6,343,153 B1
• Filed: 04/02/1999
• Issued: 01/29/2002
• Est. Priority Date: 04/03/1998
• Status: Expired due to Term

• Current Assignee: Sovereign Peak Ventures, LLC (Dominion Harbor Enterprises, LLC)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kashiwagi, Yoshiichiro, Hasebe, Takumi, Nakamura, Kazuhiko, Kawasaki, Kojiro
• Primary Examiner(s): COUSO, YON JUNG
• Application Number:
  US09/283,983
• Time in Patent Office: 1,033 Days
• Field of Search: 382/239, 382/232, 382/236, 348/401.1, 348/402.1, 348/409.1, 348/406.1, 348/407.1
• US Class Current: 382/239
• CPC Class Codes: H04N 19/124 Quantisation
• CPC Class Codes: H04N 19/14 Coding unit complexity, e.g. amount of activity or edge presence estimation H04N19/146 takes precedence
• CPC Class Codes: H04N 19/15 by monitoring actual compressed data size at the memory before deciding storage at the transmission buffer
• CPC Class Codes: H04N 19/152 by measuring the fullness of the transmission buffer
• CPC Class Codes: H04N 19/154 Measured or subjectively estimated visual quality after decoding, e.g. measurement of distortion use of rate-distortion criteria H04N19/147
• CPC Class Codes: H04N 19/177 the unit being a group of pictures [GOP]
• CPC Class Codes: H04N 19/179 the unit being a scene or a shot
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

A coding compression method for encoding the video image signal with a variable bit rate includes performing coding to the video image signal for each predetermined coding unit in accordance with a predetermined first coding parameter, which coding is completed within the coding unit, thereby generating a first coded stream, calculating a second coding parameter of the video image signal for each the predetermined coding unit while generating the first coded stream, indicating a partial section of the first coded stream, the partial section comprising the predetermined coding units, editing the second coding parameters corresponding to the designated subsections, performing coding to the video image signal of the designated subsections in accordance with the edited second coding parameters thereby to produce a second coded stream, and replacing a partial section of the first coded stream with at least a partial section of the second coded stream, the partial section of the second coded stream corresponding to the partial section of the first coded stream.

Claims

1. A coding compression method for encoding a video image signal with a variable bit rate, comprising:

performing coding to said video image signal for each predetermined coding unit in accordance with a predetermined first coding parameter, which coding is completed within said coding unit, thereby generating a first coded stream;

creating a second coding parameter of said video image signal for each said predetermined coding unit while creating said first coded stream;

indicating a partial section of said first coded stream, said partial section comprising said predetermined coding units;

editing said second coding parameters corresponding to said partial section of said first coded stream;

performing coding to said video image signal of said partial section of said first coded stream in accordance with said edited second coding parameters thereby to produce a second coded stream; and

replacing a partial section of said first coded stream with at least a partial section of said second coded stream, said partial section of said second coded stream corresponding to said partial section of said first coded stream.

2. The coding compression method of claim 1, wherein;

said first and said second coded streams each comprises an MPEG stream and said predetermined coding unit comprises a closed Group of Picture, which is coded without referring to previous and behind coding units.

3. The coding compression method of claim 1, wherein;

said second coding parameter comprises at least one of modulation intensity of quantization step, quantization matrix, degree of modulation of pixel level, search range of motion vector, detection condition of motion vector and target code amount of said video image signal.

4. The coding compression method of claim 1, wherein;

said first and said second coded streams each comprises an MPEG stream,

said MPEG stream comprises a plurality of pictures type having different prediction methods and,

the editing step for editing said second coding parameter corresponding to said indicated partial section is a step for editing only the second coding parameter of the MPEG stream of a particular picture type among said plurality of picture types.

5. The coding compression method of claim 1, wherein;

said first and said second coding parameters each comprises an MPEG stream and,

said second coding parameter comprises a GOP structure.

6. The coding compression method of claim 1, wherein;

said first and said second coded streams each comprises an MPEG stream which is generated by a video image signal which is subjected to a television-cinema conversion being subjected to a reverse television-cinema conversion including a copy field and,

said second coding parameter is an information at least indicating a field of said vide image signal which is made a copy field.

7. A coding compression apparatus comprising:

a first coding means for performing coding to said video image signal for each predetermined coding unit in accordance with a predetermined first coding parameter, which coding is completed within said predetermined coding unit, thereby to generate a first coded stream;

a coding parameter creating means for creating a second coding parameter of said video image signal for each said predetermined coding unit while creating said first coded stream;

an indicating means for indicating a partial section of said first coded stream comprising said predetermined coding units;

an editing means for editing said second coding parameter corresponding to said indicated partial section;

a second coding means for performing coding to said video image signal of said indicated partial section of said second coded stream in accordance with said edited second coding parameter thereby to generate a second coded stream; and

a replacing means for replacing at least a partial section of said first coded stream with at least a partial section of said second coded stream, said partial section of said second coded stream corresponding to said partial section of said first coded stream.

8. The coding compression apparatus of claim 7, wherein;

said first and said second coded streams each comprises an MPEG stream and said predetermined coding unit comprises a closed Group of Picture, which is coded without referring to previous and behind coding units.

9. The coding compression apparatus of claim 7, wherein;

said second coding parameter comprises at least one of modulation intensity of quantization step, quantization matrix, degree of modulation of pixel level, search range of motion vector, detection condition of motion vector and target data amount of said video image signal.

10. The coding compression apparatus of claim 7, wherein;

said first and said second coded streams each comprises an MPEG stream and said MPEG stream comprises a plurality of pictures type having different prediction methods, and the editing step for editing said second coding parameter corresponding to said indicated partial section is a step for editing only the second coding parameter of the MPEG stream of a particular picture type among said plurality of picture types.

11. The coding compression apparatus of claim 8, wherein;

said first and said second coding parameters each comprises an MPEC stream and said second coding parameter comprises a GOP structure.

12. The coding compression apparatus of claim 7, wherein;

said first and said second coded streams each comprises an MPEG stream which is generated by a video image signal which is subjected to a television-cinema conversion being subjected to a reverse television-cinema conversion including a copy field, and said second coding parameter is an information at least indicating a field of said vide image signal which is made a copy field.