Title:
画像処理装置及びその制御方法
Document Type and Number:
Japanese Patent JP4795473
Kind Code:
B2
Abstract:
An image processing apparatus includes a histogram creation unit that creates a histogram from an input image, a detection unit that detects a gradation level of interest from the histogram, a gradation correction parameter generation unit that generates a gradation correction parameter to improve a gradation characteristic in a gradation range around the gradation level of interest, and a correction unit that corrects the gradation of the image using the gradation correction parameter. The detection unit detects, as the gradation level of interest, a gradation level whose frequency is a peak value equal to or more than a predetermined threshold, and which has variation width of frequencies in a predetermined range including this gradation level to be smaller than a predetermined width in the histogram.
Inventors:
Yuki Shindo
Izumi Kanai
Tetsuji Saito
Izumi Kanai
Tetsuji Saito
Application Number:
JP2010057700A
Publication Date:
October 19, 2011
Filing Date:
March 15, 2010
Export Citation:
Assignee:
Canon Inc
International Classes:
H04N1/407; G06T5/00
Domestic Patent References:
| JP2007208399A | ||||
| JP2005108208A |
Attorney, Agent or Firm:
Kazunobu Sera
Yoshiyuki Kawaguchi
Mayuko Wakuda
Koichiro Sakai
Takeshi Nakamura
Takeshi Niwa
Yoshiyuki Kawaguchi
Mayuko Wakuda
Koichiro Sakai
Takeshi Nakamura
Takeshi Niwa