IN-FOCUS POSITION DETECTOR FOR ELECTRONIC CAMERA,申请号JP19940134296-传众专利搜索

IN-FOCUS POSITION DETECTOR FOR ELECTRONIC CAMERA

申请公布号：JPH089231(A)

申请号：JP19940134296

申请日期：1994.06.16

申请公布日期：1996.01.12

申请人：

KONICA CORP

发明人：HAYASHI SHUJI

分类号：H04N5/232;G02B7/28;(IPC1-7):H04N5/232

主分类号：H04N5/232

摘要：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.