Signal compressing system

• US 7,609,760 B2
• Filed: 01/05/2009
• Issued: 10/27/2009
• 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): DIEP, NHON THANH
• Application Number:
  US12/348,510
• Publication Number:
  US 20090103611A1
• Time in Patent Office: 295 Days
• Field of Search: 375/240.02, 375/240.18, 37524024- 25
• US Class Current: 375/240.02
• 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 scanning apparatus in a video signal decompression system, the decompression system comprising an extractor configured to receive a compressed video signal, the compressed video signal containing variable length encoded data representing a set of video spatial frequency coefficients of an individual sub-block using a scanning pattern of a plurality of scanning patterns and containing a scanning mode signal indicating the scanning pattern, the scanning mode signal not being variable length encoded, and configured to extract the variable length encoded data and the scanning mode signal from the received signal, and an entropy decoder which variable length decodes the variable length encoded data to produce an variable length decoded data, the scanning apparatus comprising:

a scanning unit which receives the variable length decoded data, scans and returns the set of video spatial frequency coefficients of the individual sub-block to the original order according to the scanning pattern of the plurality of scanning patterns by using the scanning mode signal; and

an outputting unit which outputs the scanned video signal to a dequantizer which dequantizes the scanned video signal, and the dequantizer outputs the dequantized video signal to an inverse transform unit which inverse transforms the dequantized video signal.