Title:
IMAGE PICKUP DEVICE
Document Type and Number:
Japanese Patent JP3647052
Kind Code:
B2
Abstract:
PURPOSE: To obtain a picture signal suitable for a computer or a printer or the like by estimating properly a missing complementary color of a picture element through the use of plural formulae so as to generate RGB three primary color signals without deteriorating the saturation and the band width while suppressing the generation of a false color to a minimum.
CONSTITUTION: The relation Wrc={(Yc-Y1) /(Y2-Y1)}*(Wr2-Yr1)+Wr1 (1) is assumed for Wr desired to be estimated where Wr1 and Wr2 are existing values of each complementary color Wr (Wr=Mg+Ye), and Y1, Y2, Y3 are luminance values of the same picture element. Or, the relation Wrc=(Wr1+Wr2)/2 (2) which is used in the conventional method may be. Or, the relation Wrc=Wr1+(Yc- Y1)*K (3) may be adopted by using an optional coefficient K. The three kinds of formulae are integrated respectively in a circuit. The estimation method of a 1st complementary color estimate means 8 uses formula (2), the estimation method of a 2nd complementary color estimate means 9 uses formula (3), and the estimation method of a 3rd complementary color estimate means 10 uses formula (1). The three estimation methods are used adaptively.
Inventors:
Kosuke Nobuoka
Application Number:
JP8866393A
Publication Date:
May 11, 2005
Filing Date:
April 15, 1993
Export Citation:
Assignee:
Canon Inc
International Classes:
H04N5/335; H04N5/367; H04N5/372; H04N5/378; H04N9/04; H04N9/07; H04N9/64; (IPC1-7): H04N9/07
Domestic Patent References:
| JP57132490A | ||||
| JP5268613A | ||||
| JP62252289A | ||||
| JP60224387A | ||||
| JP60264182A |
Attorney, Agent or Firm:
Keizo Nishiyama
Yuichi Uchio
Yuichi Uchio