Title:
DEVICE FOR CODING IMAGE DATA
Document Type and Number:
Japanese Patent JPS63222591
Kind Code:
A
Abstract:
PURPOSE:To guarantee high-speed processing and to prevent the deterioration of a reproduced image by separating a color image signal into a bit of brightness information and a bit of chrominance information that have less correlation with each other, and effectively quantizing the brightness information in vector. CONSTITUTION:A color converter 12 separates inputted RGB signals into the brightness information 13 and the chrominance information 14 that have less correlation with each other. An encoder 15 calculates a mean value which is the DC component of the brightness block of the brightness information 13, and a standard deviation which is a bit of contrast information, also, codes the AC component of the brightness block into a primary code, and further, quantizes the primary code into a secondary code by means of vector- quantization. As a result, a multi-level image data can be highly efficiently coded without deteriorating the quality of a reproduced image.
Inventors:
FUNADA MASAHIRO
SUZUKI YOSHIYUKI
SUZUKI YOSHIYUKI
Application Number:
JP5519687A
Publication Date:
September 16, 1988
Filing Date:
March 12, 1987
Export Citation:
Assignee:
CANON KK
International Classes:
H04N19/00; H03M7/30; H04N19/126; H04N19/14; H04N19/176; H04N19/186; H04N19/189; H04N19/196; H04N19/423; H04N19/85; H04N19/90; H04N19/94; (IPC1-7): H03M7/30; H04N7/13
Domestic Patent References:
| JPS61174824A | 1986-08-06 |
Attorney, Agent or Firm:
Yasunori Otsuka