Multiple picture-data compression system

• US 7,515,760 B2
• Filed: 05/27/2005
• Issued: 04/07/2009
• Est. Priority Date: 10/06/2004
• Status: Expired due to Fees

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Horiuchi, Tadasu, Sai, Hirotomo, Yoshida, Daisuke
• Primary Examiner(s): Bali, Vikkram
• Assistant Examiner(s): YEH, EUENG NAN
• Application Number:
  US11/138,282
• Publication Number:
  US 20060093229A1
• Time in Patent Office: 1,411 Days
• Field of Search: 382/238
• US Class Current: 382/238
• CPC Class Codes: H04N 19/573 Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
• CPC Class Codes: H04N 19/59 involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution

Abstract

A picture-data compression system for compressing inputted multiple picture data includes a storage device that stores the multiple picture data; a selection controller that writes the multiple picture data into the storage device and reads the multiple picture data from the storage device; a pixel-number converter that converts the number of pixels of the picture data read from the storage device; and an inter-picture predictive coding unit that codes the picture data whose number of pixels is converted by the pixel-number converter by inter-picture predictive coding. The selection controller reads the picture data written to the storage device at a period of 1/n (positive integer) times the frame period or field period of the picture data. The pixel-number converter converts the number of pixels of the picture data read from the storage device to 1/m times (positive integer) the original.

Claims

1. A picture-data compression system for compressing inputted multiple picture data, comprising:

a storage device that stores the multiple picture data;

a selection controller that writes the multiple picture data into the storage device and reads the multiple picture data from the storage device;

a pixel-number converter that converts the number of pixels of the picture data read from the storage device; and

an inter-picture predictive coding unit that codes the picture data whose number of pixels is converted by the pixel-number converter by inter-picture predictive coding, wherein

the selection controller reads the picture data written to the storage device at a period of 1/n (positive integer) times the frame period or field period of the picture data;

the pixel-number converter converts the number of pixels of the picture data read from the storage device to 1/m times (positive integer) the original; and

the selection controller controls the values n and m depending on the number of pixels that can be processed by the inter-picture predictive coding unit in a unit time.

2. The picture-data compression system according to claim 1 wherein

the selection controller reads the multiple picture data from the storage device in units of multiple frames or multiple fields.

3. The picture-data compression system according to claim 1 wherein

the selection controller controls the period of reading picture data from the storage device to be a frame period or field period of 30 per second, 60 per second, or 120 per second.

4. A picture-data compression system for compressing inputted multiple picture data, comprising:

a storage device that stores the multiple picture data;

a selection controller that writes the multiple picture data into the storage device and reads the multiple picture data from the storage device;

a pixel-number converter that converts the number of pixels of the picture data read from the storage device; and

an inter-picture predictive coding unit that codes the picture data whose number of pixels is converted by the pixel-number converter by inter-picture predictive coding, wherein

the selection controller reads the picture data written to the storage device at a period of 1/n (positive integer) times the frame period or field period of the picture data;

the pixel-number converter converts the number of pixels of the picture data read from the storage device to 1/m times (positive integer) the original; and

a display unit that displays the multiple picture data in real time, wherein

the selection controller reads picture data from the storage device, the picture data being different from the picture data coded by the inter-picture predictive coding unit, and outputs the picture data to the display unit.

5. A picture-data compression system for compressing inputted multiple picture data, comprising:

a storage device that stores the multiple picture data;

a selection controller that writes the multiple picture data into the storage device and reads the multiple picture data from the storage device;

a pixel-number converter that converts the number of pixels of the picture data read from the storage device; and

an inter-picture predictive coding unit that codes the picture data whose number of pixels is converted by the pixel-number converter by inter-picture predictive coding, wherein

the selection controller reads the picture data written to the storage device at a period of 1/n (positive integer) times the frame period or field period of the picture data;

the pixel-number converter converts the number of pixels of the picture data read from the storage device to 1/m times (positive integer) the original;

the selection controller reads the multiple picture data from the storage device in units of multiple frames or multiple fields; and

the selection controller controls the values n and m depending on the number of pixels that can be processed by the inter-picture predictive coding unit in a unit time.

6. The picture-data compression system according to claim 5 wherein

the selection controller controls the period of reading picture data from the storage device to be a frame period or field period of 30 per second, 60 per second, or 120 per second.

7. A picture-data compression system for compressing inputted multiple picture data, comprising:

a storage device that stores the multiple picture data;

a selection controller that writes the multiple picture data into the storage device and reads the multiple picture data from the storage device;

a pixel-number converter that converts the number of pixels of the picture data read from the storage device; and

an inter-picture predictive coding unit that codes the picture data whose number of pixels is converted by the pixel-number converter by inter-picture predictive coding, wherein

the selection controller reads the picture data written to the storage device at a period of 1/n (positive integer) times the frame period or field period of the picture data;

the pixel-number converter converts the number of pixels of the picture data read from the storage device to 1/m times (positive integer) the original;

the selection controller reads the multiple picture data from the storage device in units of multiple frames or multiple fields; and

a display unit that displays the multiple picture data in real time, wherein

the selection controller reads picture data from the storage device, the picture data being different from the picture data coded by the inter-picture predictive coding unit, and outputs the picture data to the display unit.

8. A picture-data compression system for compressing inputted multiple picture data, comprising:

a pixel-number converter that converts the number of pixels of the multiple picture data;

a storage device that stores the multiple picture data whose number of pixels is converted by the pixel-number converter;

a selection controller that writes multiple picture data into the storage device and reads multiple picture data from the storage device; and

an inter-picture predictive coding unit that codes the picture data read by the selection controller by inter-picture predictive coding, wherein

the pixel-number converter converts the number of pixels of the picture data to 1/m times (positive integer) the original for each frame or field;

the selection controller merges the m pieces of picture data converted by the pixel-number converter and writes the merged picture data into the storage device, and reads the merged picture data at the frame period or field period of the inputted multiple picture data; and

the selection controller controls the value m depending on the number of pixels that can be processed by the inter-picture predictive coding unit in a unit time.

9. The picture-data compression system according to claim 8 wherein

the selection controller reads the multiple picture data from the storage device in units of multiple frames or multiple fields.

10. The picture-data compression system according to claim 8 wherein

the selection controller controls the period of reading picture data from the storage device to be a frame period or field period of 30 per second, 60 per second, or 120 per second.

11. A picture-data compression system for compressing inputted multiple picture data, comprising:

a pixel-number converter that converts the number of pixels of the multiple picture data;

a storage device that stores the multiple picture data whose number of pixels is converted by the pixel-number converter;

a selection controller that writes multiple picture data into the storage device and reads multiple picture data from the storage device; and

an inter-picture predictive coding unit that codes the picture data read by the selection controller by inter-picture predictive coding, wherein

the pixel-number converter converts the number of pixels of the picture data to 1/m times (positive integer) the original for each frame or field;

the selection controller merges the m pieces of picture data converted by the pixel-number converter and writes the merged picture data into the storage device, and reads the merged picture data at the frame period or field period of the inputted multiple picture data; and

a display unit that displays the multiple picture data in real time, wherein

the selection controller reads picture data from the storage device, the picture data being different from the picture data coded by the inter-picture predictive coding unit, and outputs the picture data to the display unit.