Title:
INPUT OUTPUT CORRECTION METHOD BY CONDITION DESIGNATION POLYNOMIAL AND IMAGE PROCESSING UNIT
Document Type and Number:
Japanese Patent JP3666993
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain the input/output correction method and the image processing unit in which an input/output correction curve of an optionally desired shape by introducing a condition designation polynomial and providing simple conditions such as coordinates of some passing points and inclination of a tangential line at start and end points.
SOLUTION: A gamma correction curve generating section 403 reads a prescribed parameter from a parameter memory 402 in the mode or the like designated by a operation section 401 usually and generates a gamma correction curve by using the condition designation polynomial by this invention and provides an output of it to gamma correction arithmetic sections 405, 406. Input image data from a scanner 404 are subjected to gamma correction into image data independently of a characteristic of the scanner 404 by the gamma correction arithmetic section 405 and gamma corrected into image data optimum to the characteristic of a printer 409 by a gamma correction arithmetic section 408 via a color representation system conversion section 407 and the resulting data are outputted to the printer 409. Thus, an input/output correction curve of an optional and desired shape is obtained.
Inventors:
Yusuke Ota
Noboru Murata
Noboru Murata
Application Number:
JP14197796A
Publication Date:
June 29, 2005
Filing Date:
June 04, 1996
Export Citation:
Assignee:
株式会社リコー
International Classes:
G03G15/00; G06T5/00; H04N1/407; B41J2/52; (IPC1-7): H04N1/407; B41J2/52; G03G15/00; G06T5/00
Domestic Patent References:
| JP8125865A | ||||
| JP5061972A | ||||
| JP6105154A | ||||
| JP8307686A | ||||
| JP7170404A |
Attorney, Agent or Firm:
Makoto Suzuki
Kazuhito Oura
Kazuhito Oura