Image information encoding/decoding system

• US 6,031,963 A
• Filed: 09/19/1997
• Issued: 02/29/2000
• Est. Priority Date: 02/03/1995
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Mimura, Hideki, Kitamura, Tetsuya, Shirasuna, Toshiaki, Aoki, Tae
• Primary Examiner(s): Chevalier, Robert
• Application Number:
  US08/933,904
• Time in Patent Office: 893 Days
• Field of Search: 386/45, 386/46, 386/95, 386/106, 386/109, 386/111, 386/112, 386/1, 386/27, 386/33, 348/386, 360/32
• US Class Current: 386/329
• CPC Class Codes: G11B 2220/211 Discs having both read-only and rewritable or recordable areas containing application data; Partial ROM media
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/2525 Magneto-optical [MO] discs
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: H04N 11/02 with bandwidth reduction H04N11/04 , H04N11/24 take precedence
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/242 Synchronization processes, e.g. processing of PCR [Program Clock References] arrangements for synchronising broadcast or distribution via plural systems in broadcast distribution systems H04H20/18
• CPC Class Codes: H04N 21/426 Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/43072 of multiple content streams on the same device
• CPC Class Codes: H04N 21/4325 by playing back content from the storage medium reproduction of recorded television signals H04N5/76; reproduction of recorded television signals H04N9/79
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/4884 for displaying subtitles
• CPC Class Codes: H04N 5/44504 Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits
• CPC Class Codes: H04N 5/45 Picture in picture , e.g. displaying simultaneously another television channel in a region of the screen
• CPC Class Codes: H04N 5/85 on discs or drums
• CPC Class Codes: H04N 7/56 Synchronising systems therefor
• CPC Class Codes: H04N 9/8042 : involving data reduction
• CPC Class Codes: H04N 9/8045 : using predictive coding
• CPC Class Codes: H04N 9/82 : the individual colour picture signal components being recorded simultaneously only
• CPC Class Codes: H04N 9/8216 : using time division multiplex
• CPC Class Codes: H04N 9/8227 : the additional signal being at least another television signal

Abstract

A sub-picture packet is encoded using a packet header containing a time stamp, sub-picture data containing compressed pixel data, one or more display control sequences, and a sub-picture unit header. The time stamp indicates the playback start time of the sub-picture packet. The display control sequence defines the order of display of the sub-picture data. The sub-picture unit header indicates the size of the sub-picture packet and the location of the display control sequence. The encoded sub-picture packet is decoded, and displayed based on the display control sequence.

Claims

1. An encoding and decoding method, wherein a sub-picture, simultaneously reproducible with a main picture, is encoded into at least one sub-picture packet, said method comprising:

converting said sub-picture into bit-mapped sub-picture data;

preparing a spatial parameter for defining a display area of said sub-picture on a display area of the main picture;

compressing said bit-mapped sub-picture data according to a predetermined compression technique to generate compressed pixel data;

preparing display start time information for specifying a display start time of said sub-picture;

preparing at least one display control sequence table for controlling a display of said sub-picture;

preparing a sub-picture data unit header having size information, for identifying a size of a sub-picture data unit used to generate said sub-picture and being defined by contents of said at least one sub-picture packet, and position information, for identifying a position of said display control sequence table in said sub-picture data unit;

combining the compressed pixel data and said display control sequence table with said sub-picture data unit header to generate a sub-picture data unit;

generating a sub-picture data unit packet when a size of said sub-picture data unit exceeds a predetermined value;

recording time stamp information at a header of said sub-picture data unit packet having a size exceeding the predetermined value or said sub-picture data unit having a size not more than the predetermined value, said time stamp information representing a playback start time of said sub-picture encoded into said at least one sub-picture packet;

packing said sub-picture data unit packet having said time stamp information or packing said sub-picture data unit having said time stamp information to generate a data stream containing data from the packed sub-picture data unit and other data;

separating the data of the packed sub-picture data unit from the data stream;

disassembling the pack of the separated sub-picture data unit;

extracting said time stamp information from the disassembled pack if the time stamp information is recorded at the disassembled pack;

comparing the extracted time stamp information with time information provided by a system timer; and

checking one or more contents of said display control sequence table if the extracted time stamp information matches the time information from the system timer.

2. A method of decoding a data stream obtained by packing a plurality of sub-picture data units, each sub-picture data unit including time stamp information for indicating a playback start time of bit-mapped sub-picture packets encoded into at least one of said sub-picture data units, a display control sequence table for controlling a display of a sub-picture, pixel data obtained by compressing the bit-mapped sub-picture, and a sub-picture data unit header having size information, for identifying a size of said sub-picture data unit used to generate said sub-picture and being defined by contents of at least one sub-picture packet, and having position information, for identifying a position of said display control sequence table in said sub-picture data unit, said method comprising:

separating the data of the packed sub-picture data unit from the data stream;

disassembling the pack of the separated sub-picture data unit;

extracting said time stamp information from the disassembled pack if said time stamp information is recorded at the disassembled pack;

comparing the extracted time stamp information with time information provided by a system timer; and

checking one or more contents of said display control sequence table if the extracted time stamp information matches the time information from the system timer.

3. An apparatus of encoding image information, wherein a sub-picture, simultaneously reproducible with a main picture, is encoded into at least one sub-picture packet, said apparatus comprising:

means for converting said sub-picture into bit-mapped sub-picture data;

means for preparing a spatial parameter for defining a display area of said sub-picture on a display area of said main picture;

means for compressing the bit-mapped sub-picture data according to a predetermined compression technique to generate compressed pixel data;

means for preparing display start time information for specifying a display start time of said sub-picture;

means for preparing at least one display control sequence table for controlling a display of said sub-picture;

means for preparing a sub-picture data unit header having size information for identifying a size of a sub-picture data unit used to generate said sub-picture and being defined by contents of said at least one sub-picture packet, and position information, for identifying a position of said display control sequence table in said sub-picture data unit;

means for combining the compressed pixel data and said display control sequence table with said sub-picture data unit header to generate said sub-picture data unit;

means for generating a sub-picture data unit packet when a size of said sub-picture data unit exceeds a predetermined value;

means for recording time stamp information at a header of said sub-picture data unit packet having a size exceeding the predetermined value or said sub-picture data unit having a size not more than the predetermined value, said time stamp information representing a playback start time of said sub-picture encoded into said at least one sub-picture packet; and

means for packing said sub-picture data unit packet having said time stamp information or packing said sub-picture data unit having said time stamp information to generate a data stream containing data from the packed sub-picture data unit and other data.

4. An encoding and decoding apparatus, wherein a sub-picture, simultaneously reproducible with a main picture, is encoded into at least one sub-picture packet, said apparatus comprising:

means for converting said sub-picture into bit-mapped sub-picture data;

means for preparing a spatial parameter for defining a display area of said sub-picture on a display area of said main picture;

means for compressing the bit-mapped sub-picture data according to a predetermined compression technique to generate compressed pixel data;

means for preparing display start time information for specifying a display start time of said sub-picture;

means for preparing at least one display control sequence table for controlling a display of said sub-picture;

means for preparing a sub-picture data unit header having size information, for identifying a size of a sub-picture data unit used to generate said sub-picture and being defined by contents of said at least one sub-picture packet, and position information, for identifying a position of said display control sequence table in said sub-picture data unit;

means for combining the compressed pixel data and said display control sequence table with said sub-picture unit header to generate said sub-picture data unit;

means for generating a sub-picture data unit packet when a size of said sub-picture data unit exceeds a predetermined value;

means for recording time stamp information at said sub-picture data unit packet having a size exceeding the predetermined value or said sub-picture data unit having a size not more than the predetermined value, said time stamp information representing a playback start time of said sub-picture encoded into said at least one sub-picture packet;

means for packing said sub-picture data unit packet having said time stamp information or packing said sub-picture data unit having said time stamp in order to generate a data stream containing data from said packed sub-picture data unit and other data;

means for separating the data from said packed sub-picture data unit from the data stream;

means for disassembling the pack of the separated sub-picture data unit;

means for extracting said time stamp information from the disassembled pack if said time stamp information is recorded at the disassembled pack;

means for comparing the extracted time stamp information with time information provided by a system timer; and

means for checking one or more contents of said display control sequence table if the extracted time stamp information matches the time information from the system timer.

5. An apparatus for decoding a data stream obtained by packing a plurality of sub-picture data units, each sub-picture data unit including time stamp information for indicating a playback start time of bit-mapped sub-picture packets encoded into at least one of said sub-picture data units, a display control sequence table for controlling a display of a sub-picture, pixel data obtained by compressing the bit-mapped sub-picture, and a sub-picture data unit header having size information, for identifying a size of said sub-picture data unit used to generate said sub-picture and being defined by contents of at least one sub-picture packet, and having position information, for identifying a position of said display control sequence table in said sub-picture data unit, said apparatus comprising:

means for separating the data of the packed sub-picture data unit from the data stream;

means for disassembling the pack of the separated sub-picture data unit;

means for extracting said time stamp information from the disassembled pack if said time stamp information is recorded at the disassembled pack;

means for comparing the extracted time stamp information with time information provided by a system timer; and

means for checking one or more contents of said display control sequence table if the extracted time stamp information matches the time information from the system timer.

6. An apparatus for decoding and playing back a data stream obtained by packing a plurality of sub-picture data units, each sub-picture data unit including time stamp information for indicating a playback start time of bit-mapped sub-picture packets encoded into at least one of said sub-picture data units, a display control sequence table for controlling a display of a sub-picture, pixel data obtained by compressing the bit-mapped sub-picture, and a sub-picture data unit header having size information, for identifying a size of said sub-picture data unit used to generate said sub-picture and being defined by contents of at least one sub-picture packet, and having position information, for identifying a position of said display control sequence table in said sub-picture data unit, said apparatus comprising:

means for separating the data from the packed sub-picture data unit from the data stream;

means for disassembling the pack of the separated sub-picture data unit;

means for extracting said time stamp information from the disassembled pack if said time stamp information is recorded at the disassembled pack;

means for comparing the extracted time stamp information with time information provided by a system timer; and

means for checking one or more contents of said display control sequence table if the extracted time stamp information matches the time information from the system timer.