RECEIVING APPARATUS, RECEIVING METHOD, PROGRAM AND COMMUNICATION SYSTEM

• US 20090285310A1
• Filed: 05/13/2009
• Published: 11/19/2009
• Est. Priority Date: 05/16/2008
• Status: Abandoned Application

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hosaka, Kazuhisa, Nishimura, Naoto, Iwami, Hideki, Akinaga, Hiroshi, Futenma, Satoshi
• Application Number:
  US12/465,479
• Publication Number:
  US 20090285310A1
• Time in Patent Office: Days
• US Class Current: 375/240.250
• CPC Class Codes: H04N 19/134 characterised by the element, parameter or criterion affecting or controlling the adaptive coding
• CPC Class Codes: H04N 19/42 characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation H04N19/635 takes precedence
• 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 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/619 the transform being operated outside the prediction loop
• CPC Class Codes: H04N 19/63 using sub-band based transform, e.g. wavelets
• CPC Class Codes: H04N 5/04 Synchronising for television systems using pulse code modulation H04N7/56
• CPC Class Codes: H04N 5/08 Separation of synchronising signals from picture signals

Abstract

There is provided a receiving apparatus including a header detection section that receives image data encoded per a coding unit corresponding to N (N is equal to or greater than 1) lines in one field and detects control information to decide a decoding start point of the image data from a header attached to the image data, a storage section that stores the image data in each storage area assigned per the coding unit, a decoding start instruction section that decides a decoding start point of the image data based on the control information detected by the header detection section and, after waiting till the decoding start point, instructs a start of decoding per the coding unit, and a decoding section that decodes the image data stored in the storage section per the coding unit after the instruction to start decoding being received from the decoding start instruction section.

Claims

1. A receiving apparatus, comprising:

a header detection section that receives image data encoded per a coding unit corresponding to N (N is equal to or greater than

     1) lines in one field and detects control information to decide a decoding start point of the image data from a header attached to the image data;

a storage section that stores the image data in each storage area assigned per the coding unit;

a decoding start instruction section that decides a decoding start point of the image data based on the control information detected by the header detection section and, after waiting till the decoding start point, instructs a start of decoding per the coding unit; and

a decoding section that decodes the image data stored in the storage section per the coding unit after the instruction to start decoding being received from the decoding start instruction section.

2. The receiving apparatus according to claim 1, wherein the header detection section includes a first header detection section that detects a first time stamp corresponding to a data transmission point from a communication header attached to the image data and a second header detection section that detects a second time stamp corresponding to a coding point from an image header attached to the image data.

3. The receiving apparatus according to claim 2, wherein the decoding start instruction section adjusts the decoding start point in accordance with a time difference between the first time stamp and the second time stamp detected by the header detection section.

4. The receiving apparatus according to claim 1, wherein the decoding start instruction section sequentially measures a permissible decoding time for each coding unit from the decoding start point to instruct a start of decoding per the coding unit each time the permissible decoding time passes.

5. The receiving apparatus according to claim 1, wherein if reception of image data to be decoded per the coding unit is not completed, the decoding start instruction section inserts dummy data instead of the image data whose reception is not completed.

6. The receiving apparatus according to claim 5, wherein the dummy data is image data of a previous picture or a picture prior to the previous picture in a line or line block identical to that of the image data to be decoded.

7. The receiving apparatus according to claim 4, wherein if image data to be decoded remains when the permissible decoding time per the coding unit ends, the decoding start instruction section makes the image data to be decoded deleted.

8. The receiving apparatus according to claim 1, wherein the decoding start instruction section decides a point when a predetermined time passes after control information indicating that a head of a picture has been recognized being output by the header detection section as the decoding start point.

9. The receiving apparatus according to claim 1, further comprising a synchronization control section that transmits a signal to designate a transmission start time of the image data to a source apparatus of the image data.

10. The receiving apparatus according to claim 9, wherein

the synchronization control section designates a decoding start time having a time interval to absorb fluctuations of a communication environment between the transmission start time and the decoding start time for the decoding start instruction section and

the decoding start instruction section decides the decoding start point based on the designated decoding start time.

11. The receiving apparatus according to claim 1, wherein

the header detection section includes a first header detection section that detects a first time stamp corresponding to a data transmission point from a communication header attached to the image data and a second header detection section that detects a second time stamp corresponding to a coding point from an image header attached to the image data and

the decoding start instruction section decides, based on switching information for switching processing to be performed, a point when a predetermined time passes after control information indicating that a head of a picture has been recognized being output by the header detection section as the decoding start point or adjusts the decoding start point in accordance with a time difference between the first time stamp and the second time stamp detected by the header detection section.

12. The receiving apparatus according to claim 1, further comprising:

a synchronization control section that transmits a signal to designate a transmission start time of the image data to a source apparatus of the image data and designates a decoding start time having a time interval to absorb fluctuations of a communication environment between the transmission start time and the decoding start time for the decoding start instruction section, wherein

the decoding start instruction section decides, based on switching information for switching processing to be performed, a point when a predetermined time passes after control information indicating that a head of a picture has been recognized being output by the header detection section as the decoding start point or decides the decoding start point based on the decoding start time designated by the synchronization control section.

13. The receiving apparatus according to claim 1, further comprising:

a synchronization control section that transmits a signal to designate a transmission start time of the image data to a source apparatus of the image data and designates a decoding start time having a time interval to absorb fluctuations of a communication environment between the transmission start time and the decoding start time for the decoding start instruction section, wherein

the header detection section includes a first header detection section that detects a first time stamp corresponding to a data transmission point from a communication header attached to the image data and a second header detection section that detects a second time stamp corresponding to a coding point from an image header attached to the image data and

the decoding start instruction section adjusts, based on switching information for switching processing to be performed, the decoding start point in accordance with a time difference between the first time stamp and the second time stamp detected by the header detection section or decides the decoding start point based on the decoding start time designated by the synchronization control section.

14. A receiving method, comprising the steps of:

receiving image data encoded per a coding unit corresponding to N (N is equal to or greater than

     1) lines in one field;

detecting control information to decide a decoding start point of the image data from a header attached to the image data;

storing the image data in each storage area assigned per the coding unit;

waiting till the decoding start point of the image data decided based on the detected control information;

instructing a start of decoding per the coding unit; and

decoding the stored image data per the coding unit after the instruction to start decoding being received.

15. A program causing a computer that controls a receiving apparatus to function as the receiving apparatus, comprising:

a header detection section that receives image data encoded per a coding unit corresponding to N (N is equal to or greater than

     1) lines in one field and detects control information to decide a decoding start point of the image data from a header attached to the image data;

a storage section that stores the image data in each storage area assigned per the coding unit;

a decoding start instruction section that decides a decoding start point of the image data based on the control information detected by the header detection section and, after waiting till the decoding start point, instructs a start of decoding per the coding unit; and

a decoding section that decodes the image data stored in the storage section per the coding unit after the instruction to start decoding being received from the decoding start instruction section.

16. A communication system comprising:

a transmitting apparatus including;

a compression section that encodes image data per a coding unit corresponding to N (N is equal to or greater than

     1) lines in one field; and

a communication section that transmits the image data encoded per the coding unit, and

a receiving apparatus including;

a communication section that receives the image data encoded per the coding unit and transmitted from the transmitting apparatus;

a header detection section that detects control information to decide a decoding start point of the image data from a header attached to the image data received by the communication section;

a storage section that stores the image data in each storage area assigned per the coding unit;

a decoding start instruction section that decides a decoding start point of the image data based on the control information detected by the header detection section and, after waiting till the decoding start point, instructs a start of decoding per the coding unit; and

a decoding section that decodes the image data stored in the storage section per the coding unit after the instruction to start decoding being received from the decoding start instruction section.