Signal compressing system

• US 7,764,735 B2
• Filed: 07/02/2009
• Issued: 07/27/2010
• Est. Priority Date: 02/29/1992
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jeong, Je-Chang, Mun, Hen-Hee
• Primary Examiner(s): VO, TUNG T
• Application Number:
  US12/497,264
• Publication Number:
  US 20090257511A1
• Time in Patent Office: 390 Days
• Field of Search: 375/240.15, 375/240.16, 375/240.17, 375/240.03, 382/236, 382/232, 382/234
• US Class Current: 375/240.03
• CPC Class Codes: H04N 19/129 Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
• CPC Class Codes: H04N 19/146 Data rate or code amount at the encoder output
• CPC Class Codes: H04N 19/15 by monitoring actual compressed data size at the memory before deciding storage at the transmission buffer
• CPC Class Codes: H04N 19/152 by measuring the fullness of the transmission buffer
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/18 the unit being a set of transform coefficients
• CPC Class Codes: H04N 19/192 the adaptation method, adaptation tool or adaptation type being iterative or recursive
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/60 using transform coding
• CPC Class Codes: H04N 19/61 in combination with predictive coding

Abstract

A multi-scanner scans a signal according to several different patterns. A scanning pattern selector determines which scanning pattern produced the most efficient coding result, for example, for runlength coding, and outputs a coded signal, coded most efficiently, and a selection signal which identifies the scanning pattern found to be most efficient.

Claims

1. A video decoding method comprising:

receiving a compressed video signal, the compressed video signal including variable length encoded data and a scanning mode signal indicating a scanning pattern of a plurality of scanning patterns, the scanning mode signal not being variable length encoded;

extracting the variable length encoded data and the scanning mode signal from the received compressed video signal;

variable length decoding the variable length encoded data;

scanning the variable length decoded data according to the scanning pattern of the plurality of scanning patterns as indicated by the scanning mode signal, to generate scanned data, the scanning pattern being selected from the plurality of scanning patterns;

dequantizing the scanned data, to generate dequantized data; and

inverse transforming the dequantized data, wherein said variable length encoded data represents a set of video spatial frequency coefficients, the set of video spatial frequency coefficients having been reordered from an original order and wherein said reordered set of video spatial frequency coefficients return to the original order according to the scanning pattern of the plurality of scanning patterns as indicated by the scanning mode signal.