SIGNAL COMPRESSING SYSTEM

• US 20100046616A1
• Filed: 11/16/2009
• Published: 02/25/2010
• Est. Priority Date: 02/29/1992
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jeong, Je-Chang, Mun, Hen-Hee
• Granted Patent: US 7,782,956 B2
• Time in Patent Office: Days
• US Class Current: 375/240.30
• 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 apparatus, comprising:

a transformer which outputs a set of video frequency coefficients of an individual sub-block;

a quantizer which outputs a quantized set of video frequency coefficients;

a scanner which is operative to scan the quantized set of video frequency coefficients according to a scanning pattern which is selected from a plurality of scanning patterns to produce a set of reordered coefficients;

an entropy coder operative to entropy encode the set of reordered coefficients and output an entropy encoded signal,

wherein the scanning pattern is indicated by a scan selection signal which is not entropy encoded.

2. The video signal compression apparatus according to claim 1, wherein the entropy coder is a variable length coder.

3. The video signal compression apparatus according to claim 1 further comprising a transmitter which transmits the entropy encoded signal and the scan selection signal that is not entropy encoded.