Title:
【発明の名称】電子カメラの合焦位置検出装置
Document Type and Number:
Japanese Patent JP3361619
Kind Code:
B2
Abstract:
PURPOSE:To quickly estimate the in-focus position of an electronic camera. CONSTITUTION:Fourier transformation data of actual image data are divided by the Fourier transformed value of the point image distribution function at each lens position, which is obtained by changing the lens position to plural positions, to obtain Fourier transformed data of a restored picture for each lens position. Low frequency components are extracted from data in respective lens positions, and their proportions are compared to calculate the evaluation values of the in-focus position, and evaluation values are compared to estimate the in-focus position. Thus, the in-focus position is estimated more quickly than the method where the in-focus position is evaluated after restored image data is obtained by inverse Fourier transformation.
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Inventors:
Shuji Hayashi
Application Number:
JP13429694A
Publication Date:
January 07, 2003
Filing Date:
June 16, 1994
Export Citation:
Assignee:
Konica Corporation
International Classes:
H04N5/232; G02B7/28; (IPC1-7): H04N5/232; G02B7/28
Domestic Patent References:
| JP4172311A | ||||
| JP6162187A | ||||
| JP6181532A |
Attorney, Agent or Firm:
Fujio Sasashima