Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
IMAGE SIGNAL CODING METHOD, IMAGE SIGNAL CODER, IMAGE SIGNAL TRANSMISSION METHOD AND RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP3879944
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To reduce deterioration in image quality by inverting at random the polarity of a quantization error as to adjacent picture element data, thereby efficiently improving the compression.
SOLUTION: Two kinds of re-quantization data (re-quantization data quantized to have a positive error and re-quantization data quantized to have a negative error) are fed to selectors 254-256 from quantization circuits 247-249 in each hierarchical layer. Then the re-quantization data quantized to have a positive error or re-quantization data quantized to have a negative error are selected alternately and outputted according to a clock signal from a controller 257. As a result, block distortion caused when all picture elements in a block have a quantization error in one polarity is avoided and deterioration in the image quality on a visual characteristic is suppressed.


More Like This:
JP2006041854VIDEO AND AUDIO RECORDING AND REPRODUCING DEVICE
JP4240578Imaging device, computer-readable recording medium and file creation method
WO/2005/004155INFORMATION RECORDING DEVICE AND INFORMATION RECORDING METHOD
Inventors:
Tetsujiro Kondo
Application Number:
JP35813896A
Publication Date:
February 14, 2007
Filing Date:
December 27, 1996
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
ソニー株式会社
International Classes:
H04N5/92; H03M7/38; H04N1/41; H04N19/00; H04N19/30; H04N19/42; H04N19/423; H04N19/46; H04N19/59; H04N19/593; H04N19/70; H04N19/80; H04N19/85; H04N19/86; H04N19/91; (IPC1-7): H04N7/24; H03M7/38; H04N1/41; H04N5/92
Domestic Patent References:
JP7099646A
JP62188565A
Attorney, Agent or Firm:
Keiki Tanabe



 
Previous Patent: STRUCTURE OF PARKING BRAKE DEVICE

Next Patent: COIN PROCESSOR FOR AUTOMATIC VENDING MACHINE