Moving picture data storing system and moving picture data decoding system

• US 5,991,503 A
• Filed: 06/10/1996
• Issued: 11/23/1999
• Est. Priority Date: 10/02/1995
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Mutou, Masao, Maeda, Kiyoshi, Masanori, Takehira, Watanabe, Hideaki, Inagaki, Hirohiko, Miyasaka, Hideki
• Primary Examiner(s): Chevalier, Robert
• Application Number:
  US08/661,023
• Time in Patent Office: 1,261 Days
• Field of Search: 386/109, 386/111, 386/112, 386/27, 386/33, 386/36, 386/67, 386/68, 386/6, 386/7, 386/8, 386/70, 386/124, 386/126, 386/125, 368/32
• US Class Current: 386/329
• CPC Class Codes: H04N 19/00 Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
• CPC Class Codes: H04N 19/423 characterised by memory arrangements H04N19/433 takes precedence
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards
• 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

An encoding unit encodes and compresses picture data in a bit map format corresponding to the MPEG method. A packet assembling portion assembles the picture data encoded by the encoding unit as packets in the format corresponding to the MPEG method, and stores the packets to a storing medium. At this point, the packet assembling portion writes an I picture index to a packet that contains at least a part of I picture data. When a special reproducing operation is performed, a data storing unit reads only packets that have the I picture index. A decoding unit decodes only I picture data of picture data contained in packets read from the storing medium and displays the decoded picture data.

Claims

1. A moving picture data storing system comprising:

dividing means for dividing picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame predictively encoded data encoded corresponding to an inter-frame predictively encoding method into packets containing only intra-frame encoded data, both intra-frame encoded data and inter-frame encoded data, and only inter-frame encoded data;

setting means for setting information whether or not the packet contains at least a part of the intra-frame encoded data at a predetermined position of the packet for each of the packets containing only intra-frame encoded data, and both intra-frame encoded data and inter-frame encoded data, and setting information the packet does not contain intra-frame encoded data at a predetermined position of the packet for the packet containing only inter-frame encoded data; and

storing means for storing the packets on a data storage medium.

2. A moving picture data storing system for dividing picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame predictively encoded data encoding corresponding to an inter-frame predictively encoding method into packets in a predetermined format and storing the packets on a data storage medium, comprising:

detecting means for detecting the intra-frame encoded data from the picture data;

determining means for determining whether or not each packet contains at least a part of the intra-frame encoded data when the picture data is divided into the packets in the predetermined format; and

means for setting information representing that the packet contains intra-frame encoded data at a predetermined position of a packet containing at least a part of the intra-frame encoded data, when said determining means has determined that the packet contains at least a part of the intra-frame encoded data.

3. A computer-readable storage medium being used to direct a computer to perform the functions of:

dividing picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame predictively encoded data encoding corresponding to an inter-frame predictively encoding method into the packets containing only intra-frame encoded data, both intra-frame encoded data and inter-frame encoded data, and only inter-frame encoded data;

setting information representing whether or not the packet contains at least a part of the inter-frame encoded data at a predetermined position of the packet for each of the packets containing only intra-frame encoded data, and both intra-frame encoded data and inter-frame encoded data, and setting information the packet does not contain intra-frame encoded data at a predetermined position of the packet for the packet containing only inter-frame encoded data; and

storing the packets on a data storage medium.

4. A moving picture data reading system for reading packets from a recording medium comprising:

reading means for reading a first packet containing only intra-frame encoded data, and a second packet containing both intra-frame encoded data and inter-frame encoded data corresponding to storage information written to each of the packets out of the first packet having the stage information containing intra-frame encoded data, the second packet having the storage information containing intra-frame encoded data, and a third packet containing only inter-frame encoded data having the storage information not containing intra-frame encoded data when a special reproduction request is received; and

sending means for sending the read packets to a decoding processing unit.

5. A moving picture data decoding system for decoding picture data with a plurality of packets of which picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame predictively encoded data encoding corresponding to an inter-frame predictively encoding method has been divided and stored as the packets containing only intra-frame encoded data both intra-frame encoded data and inter-frame predictively encoded data, and only inter-frame predictively encoded data, comprising:

decoding means for decoding a packet containing only intra-frame encoded data, and a packet containing both intra-frame predictively encoded data and inter-frame encoded data; and

outputting means for outputting the decoded data of the intra-frame encoded data as reproduced moving picture data.

6. The moving picture data decoding system as set forth in claim 5, wherein

the inter-frame predictively encoded data is removed by discarding data in which a decoding error takes place in a decoding process.

7. A moving picture data decoding system for decoding picture data with a plurality of packets of which picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame predictively encoded data encoding corresponding to an inter-frame predictively encoding method has been divided and stored as the packets containing only intra-frame encoded data, both intra-frame encoded data and inter-frame predictively encoded data, and only inter-frame predictively encoded data, comprising:

a buffer memory for storing a packet containing only intra-frame encoded data and a packet containing both intra-frame encoded data and inter-frame predictively encoded data as picture data;

detecting means for detecting the intra-frame encoded data and the inter-frame predictively encoded data;

decoding means for decoding the picture data stored in said buffer memory; and

controlling means for starting a decoding process of said decoding means when said detecting means has detected the intra-frame decoded data and for stopping the decoding process of said decoding means when said detecting means has detected the inter-frame predictively encoded data.

8. The moving picture data decoding system as set forth in claim 7, wherein

said decoding means is adapted for discarding the decoded data when one complete frame of the picture data cannot be reproduced therefrom.

9. The moving picture data decoding system as set forth in claim 7, wherein

the picture data stored in said buffer memory is discarded when a special reproduction start command or a special reproduction cancel command is received.

10. A moving picture data decoding system for decoding picture data with a plurality of packets of which picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame predictively encoded data encoding corresponding to an inter-frame predictively encoding method has been divided and stored as the packets containing only intra-frame encoded data, and both intra-frame encoded data and inter-frame predictively encoded data, and only inter-frame predictively encoded data, comprising:

a storage medium for storing the packets;

a data reading unit for reading only a packet containing only intra-frame encoded data and a packet containing both intra-frame encoded data and inter-frame predictively encoded data from said storage medium when a special reproduction request is received; and

a decoding unit for decoding packets read by said reading unit and outputting the decoded data of the intra-frame encoded data as reproduced moving picture data when the special reproduction request is received.

11. A moving picture data generating method, comprising the steps of:

dividing picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame predictively encoded data encoded corresponding to an inter-frame predictively encoding method into packets in a predetermined format; and

writing information representing that the packet contains intra-frame encoded data to a predetermined position of a packet containing at least a part of the intra-frame encoded data.

12. A moving picture data generating method, comprising the steps of:

dividing picture data comprising first encoded data and second encoded data into fixed-length packets containing only first encoded data, both first encoded data and second encoded data, and only second encoded data; and

writing information representing the presence of the first encoded data to packets that contain only the first encoded data and both the first encoded data and the second encoded data wherein the first encoded data is encoded corresponding to an intra-frame encoding method and the second encoded data is encoded corresponding to an inter-frame predictively encoding method.

13. The moving picture data generating method as set forth in claim 12, wherein

the first encoded data is decoded with only intra-frame data composed of the first encoded data.

14. A moving picture data storing method comprising the steps of:

dividing picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame predictively encoded data encoding corresponding to an inter-frame predictively encoding method into packets containing only intra-frame encoded data, both intra-frame encoded data and inter-frame encoded data, and only inter-frame encoded data;

writing information whether or not the packet contains at least a part of the intra-frame encoded data at a predetermined position of the packet for each of the packets containing only intra-frame encoded data, and both intra-frame encoded data and inter-frame encoded data, and writing information the packet does not contain intra-frame encoded data at a predetermined position of the packet for the packet containing only inter-frame encoded data; and

storing the packets on a data storage medium.

15. A moving picture data reading method for reading packets from a recording medium comprising the step of:

reading first a packet containing only intra-frame encoded data, and a second packet containing both intra-frame encoded data and inter-frame encoded data corresponding to storage information written to each of the packets out of the first packet having the storage information containing intra-frame encoded data, the second packet having the storage information containing intra-frame encoded data, and a third packet containing only inter-frame encoded data having the storage information not containing intra-frame encoded data when a special reproduction request is received; and

sending the read packet to a decoding unit.

16. A moving picture data decoding method for decoding picture data with a plurality of packets of which picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame predictively encoded data encoded corresponding to an inter-frame predictively encoding method has been divided and stored as the packets containing only intra-frame encoded data, and both intra-frame encoded data and inter-frame predictively encoded data, and only inter-frame predictively encoded data, comprising the steps of:

decoding a packet containing only intra-frame encoded data, and a packet containing both intra-frame encoded data and inter-frame predictively encoded data; and

outputting the decoded data of the intra-frame encoded data as reproduced moving picture data.

17. A computer program embodied on a computer readable medium and executable on a computer system for storing and retrieving moving picture data and directed by at least one packet of picture data contained in a computer-readable storage medium, comprising:

dividing the moving picture data intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame encoded data encoded corresponding to an inter-frame predictively encoding method, into packets, where said packets of picture data contain only said intra-frame encoded data, both said intra-frame encoded data and said inter-frame encoded data, and only said inter-frame encoded data; and

setting storage information by said computer program in said packets of picture data containing only said intra-frame encoded data, and both said intra-frame encoded data and said inter-frame encoded data.

18. A moving picture data storing system comprising:

picture data comprising;

intra-frame encoded data encoded corresponding to an intra-frame encoding method; and

inter-frame encoded data encoded corresponding to an inter-frame predictively encoding method, said moving picture data storing system dividing the picture data into packets containing only intra-frame encoded data, both intra-frame encoded data and inter-frame encoded data, and only inter-frame encoded data storing the packets on a data storage medium, and setting information whether or not the packet includes at least a part of the intra-frame encoded data at a predetermined position of the packet for each of the packets containing only intra-frame encoded data, and both intra-frame encoded data and inter-frame encoded data; and

setting information the packet does not contain intra-frame encoded data at a predetermined position of the packet for the packet containing only inter-frame encoded data.

19. A moving picture data storing method, comprising the steps of:

dividing picture data, said picture data comprising intra-frame encoded data encoded corresponding to an intra-frame encoding method and inter-frame encoded data encoding corresponding to an inter-frame predictively encoding method into packets containing only intra-frame encoded data, both intra-frame encoded data and inter-frame encoded data, and only inter-frame encoded data;

storing the packets on a data storage medium; and

writing information whether or not the packet contains at least a part of the intra-frame encoded data at a predetermined position of the packet for each of the packets containing only intra-frame encoded data, and both intra-frame encoded data and inter-frame encoded data, and writing information the packet does not contain intra-frame encoded data at a predetermined position of the packet for the packet containing only inter-frame encoded data.

20. A moving picture data storing and retrieving method, comprising the steps of:

converting said moving picture data into intra-frame encoded data using an intra-frame encoding method and inter-frame encoded data using an inter-frame predictively encoding method;

storing only the intra-frame encoded data, both the intra-frame encoded data and the inter-frame encoded data, or only the inter-frame encoded data, into each of packets;

writing information in a predetermined location of the packet indicating the packet contains only the intra-frame encoded data or both the intra-frame encoded data and the inter-frame encoded data;

retrieving said packet;

reading and displaying the packets containing only the intra-frame encoded data, both the intra-frame encoded data and the inter-frame encoded data and only the inter-frame encoded data, when a normal reproducing operation is selected; and

reading and displaying the packets containing only the intra-frame encoded data, and both the intra-frame encoded data and the inter-frame encoded data, when a special reproducing. operation is selected.