Title:
内視鏡用自動調光装置および電子内視鏡装置
Document Type and Number:
Japanese Patent JP4390440
Kind Code:
B2
Abstract:
An electronic endoscope apparatus has a light source, a pixel luminance detector, a division setter, an average block luminance calculator, a peak-luminance determiner, a representative luminance calculator, and a brightness adjuster. The division setter divides the subject image into a plurality of blocks composed of given pixels. The average block luminance calculator calculates a plurality of average block-luminance-levels. The peak-luminance determiner compares the average block-luminance-levels with each other in order to determine a substantially maximum average block-luminance-level from the plurality of average block-luminance-levels as a peak luminance level. The representative luminance calculator calculates a representative luminance level indicating a brightness of the subject image. The brightness adjuster adjusts the brightness of the subject image in accordance with the representative luminance level.
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Inventors:
Hiroyuki Kobayashi
Application Number:
JP2002317473A
Publication Date:
December 24, 2009
Filing Date:
October 31, 2002
Export Citation:
Assignee:
HOYA CORPORATION
International Classes:
A61B1/06; G02B23/24; A61B1/018; A61B1/04; A61B1/05; A61B1/07; G02B23/26; H04N7/18
Domestic Patent References:
| JP11177881A | ||||
| JP2000333901A | ||||
| JP7194527A | ||||
| JP4221527A |
Attorney, Agent or Firm:
Takashi Matsuura
Hiroki Ogura
Tsuyoshi Nonaka
Shigeru Torayama
Tsubouchi Shin
Hiroki Ogura
Tsuyoshi Nonaka
Shigeru Torayama
Tsubouchi Shin