FRAME BUFFER MEMORY OPERATING METHOD USED TO DECOMPRESS COMPRESSED MOVING PICTURES, AND DECODING APPARATUS ADAPTED TO FRAME BUFFER MEMORY OPERATING METHOD

• US 20090086818A1
• Filed: 10/01/2008
• Published: 04/02/2009
• Est. Priority Date: 10/02/2007
• Status: Abandoned Application

• Current Assignee: Ivnet Incorporated
• Original Assignee: Ivnet Incorporated
• Inventors: KIM, Ji Ho
• Application Number:
  US12/242,942
• Publication Number:
  US 20090086818A1
• Time in Patent Office: Days
• US Class Current: 375/240.120
• CPC Class Codes: G06Q 20/0855 involving a third party
• CPC Class Codes: G06Q 20/3674 involving authentication
• CPC Class Codes: G06Q 20/382 insuring higher security of transaction
• CPC Class Codes: G06Q 20/401 Transaction verification
• CPC Class Codes: G06Q 20/4012 Verifying personal identification numbers [PIN]
• CPC Class Codes: G06Q 30/0601 Electronic shopping [e-shopping]
• CPC Class Codes: H04N 19/423 characterised by memory arrangements H04N19/433 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

Abstract

Provided are a buffer memory operating method used to decompress compressed moving pictures, in which a buffer memory used during decompression of compressed moving picture is efficiently operated to efficiently reduce the capacity of an actually used buffer memory, and a decoding apparatus adapted to the buffer memory operating method. The frame buffer memory operating method includes the operations of decoding a current input I frame and storing the decoded current I frame in a standby buffer and converting the standby buffer having the decoded current I frame into a storage buffer and simultaneously converting a storage buffer having a previous I frame into another standby buffer; and decoding a current input P frame with reference to the decoded current I frame stored in the storage buffer, storing the decoded current P frame in one of the standby buffers, and converting the standby buffer having the current P frame to the other standby buffer.

Claims

1. A frame buffer memory operating method used to decompress compressed image data including I frames and P frames, the method comprising:

decoding a current input I frame and storing the decoded current I frame in a standby buffer and converting the standby buffer having the decoded current I frame into a storage buffer and simultaneously converting a storage buffer having a previous I frame into another standby buffer; and

decoding a current input P frame with reference to the decoded current I frame stored in the storage buffer, storing the decoded current P frame in one of the standby buffers, and converting the standby buffer having the current P frame to the another standby buffer.

2. The frame buffer memory operating method of claim 1, wherein:

each of the storage buffer and the standby buffer has a memory capacity corresponding to one frame; and

the number of storage buffers is equal to the number of cameras and the number of standby buffers is equal to the number of cameras that output images which are to be simultaneously displayed.

3. The frame buffer memory operating method of claim 1, wherein:

the decoding of the current I frame, storing of the decoded current I frame, and converting of the standby buffer and the storage buffer comprises storing the decoded current I frame in a first standby buffer, converting the first standby buffer having the decoded current I frame into a storage buffer and simultaneously converting a storage buffer having a previous I frame into a second standby buffer; and

the decoding of the current P frame, storing of the decoded current P frame, and converting of the standby buffer comprises storing the decoded current P frame in the first standby buffer and converting the first standby buffer having the current P frame into the second standby buffer.

4. The frame buffer memory operating method of claim 3, wherein the first and second standby buffers are relatively determined based on a point in time when one of the current I and P frames is input, and the first and second standby buffers are changed at each frame when effective decoded data is input.

5. The frame buffer memory operating method of claim 3, wherein when an image decoded and stored in one of a storage buffer and a standby buffer is backward reproduced, the I and P frames stored in the second standby buffer are output and displayed on a screen.

6. A decoding apparatus comprising:

a decoder which decodes encoded image data;

a frame buffer memory which stores frames obtained by decoding the encoded image data;

a display unit which displays the frames; and

a controller which designates each of buffer memories included in the frame buffer memory as one of a storage buffer for storing I frames and a standby buffer for storing P frames and controls the storage buffer to be changed every I frame and the standby buffer to be changed every P frame.

7. The decoding apparatus of claim 6, wherein the controller stores a current I frame decoded by the decoder in a first-ordered standby buffer, converts the first-ordered standby buffer having the decoded current I frame into a storage buffer and simultaneously converts a storage buffer having a previous I frame into a last-ordered standby buffer, stores a current input P frame decoded by the decoder in a first-ordered standby buffer, and converts the first-ordered standby buffer having the current P frame to a last-ordered standby buffer.