Title:
ELECTRONIC CAMERA
Document Type and Number:
Japanese Patent JP3785520
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To avoid image quality deterioration of defective pixels with change over aging by detecting the change of defective pixels.
SOLUTION: When power is turned on, one image is photographed through a CCD 1 in a pitch-dark state with a diaphragm 12 closed, compared wt a threshold of image data that are taken through photographing, when the image data show luminance that is higher than the threshold, it is detected as a defective pixel (white flaw) and its position information is stored. Also, when a detection mode of a defective pixel is selected with a mode switch 16, a camera is turned to a dedicated object, one image is photographed through the CCD 1 and image data that are taken through photographing are compared with the threshold. When image data show luminance that is lower than the threshold, it is detected as a defective pixel (black flaw) and its position information is stored. At the time of normal photographing, it is replaced with a mean value of the ambient pixels of the image data of the defective pixel based on the position information of the defective pixel.
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Inventors:
Naruto Takizawa
Atsushi Takayama
Atsushi Takayama
Application Number:
JP32847597A
Publication Date:
June 14, 2006
Filing Date:
November 28, 1997
Export Citation:
Assignee:
Konica Minolta Holdings Co., Ltd.
International Classes:
H04N5/335; H04N5/367; H04N5/372; H04N5/378; H04N9/07; (IPC1-7): H04N5/335
Domestic Patent References:
| JP6292091A | ||||
| JP5260385A | ||||
| JP8018873A | ||||
| JP9046601A | ||||
| JP61227481A | ||||
| JP3227185A | ||||
| JP2159887A | ||||
| JP5300438A | ||||
| JP9065378A |
Attorney, Agent or Firm:
Tomijio Sasashima