Title:
【発明の名称】カラー画像の画質改善方法及びその装置
Document Type and Number:
Japanese Patent JP2866935
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively improve the quality of a color image by correcting adaptively each pixel value of the image based on a logarithm of the ratio set between the positive and negative images and normalizing the pixel value within an output range. SOLUTION: A positive image pixel value variate decision mechanism 56 receives both minimum luminance and chrominance of a local domain of the pixel value and calculates a positive image pixel value variate via a luminance domain analysis mechanism 54 and a chrominance domain analysis mechanism 55 respectively. A negative image pixel value variate decision mechanism 57 receives both maximum luminance and chrominance of a local domain of the pixel value and calculates a negative image pixel value variate via the mechanisms 54 and 55 respectively. A pixel value correction mechanism 58 calculates a logarithm of ratio set between the pixel value of both positive and negative images which are corrected by each image pixel value variate. Then a pixel value normalization mechanism 59 receives the corrected attentional pixel value from the mechanism 58 and normalizes it within an output range.
Inventors:
SAKAMOTO TAKASHI
KATO SHUNICHI
KATO SHUNICHI
Application Number:
JP10155897A
Publication Date:
March 08, 1999
Filing Date:
April 18, 1997
Export Citation:
Assignee:
KOGYO GIJUTSU INCHO
International Classes:
G06T1/00; G06T5/00; H04N1/46; H04N1/60; H04N9/64; H04N5/20; (IPC1-7): G06T5/00; H04N1/46; H04N1/60; H04N9/64
Domestic Patent References:
| JP832827A | ||||
| JP9331469A |
Attorney, Agent or Firm:
Director, Electronic Technology Research Institute, AIST