SIGNAL COMPRESSING SYSTEM

• US 20110085597A1
• Filed: 12/28/2010
• Published: 04/14/2011
• Est. Priority Date: 02/29/1992
• Status: Active Grant

• Current Assignee: Husqvarna AB (HUSQVARNA)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: MUN, Hen-Hee, JEONG, Je-Chang
• Granted Patent: US 7,953,149 B2
• Time in Patent Office: Days
• US Class Current: 375/240.18
• 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 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/61 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 signal compression method comprising:

transforming to output a set of video frequency coefficients of an individual sub-block;

quantizing to output a quantized set of video frequency coefficients;

scanning the quantized set of video frequency coefficients according to a scanning pattern which is selected from a plurality of scanning patterns, the scanning pattern scanning each of a plurality of sub-blocks having n×

n coefficients, in a following sequence;

M(0,0), M(1,0), M(0,1), M(0,2), M(1,1), M(2,0), M(3,0), M(2,1), M(1,2), . . . , M(n-1,n-1), from lowest frequency to highest frequency to produce a set of reordered coefficients;

producing a scan selection signal indicating the scanning pattern of the scanned quantized set of video frequency coefficients; and

entropy encoding the set of reordered coefficients and outputting an entropy encoded signal,

wherein the scan selection signal is not entropy encoded.

2. The video signal compression method according to claim 1, wherein the entropy encoding is a variable length coding.