or
Bookmark and Share
Autofocus camera capable of calculating a focus match state
   
Document Number
US Patent 7505075
Issued Date
March 17, 2009
Link
Inventors
Map
Abstract
A CPU calculates integrating values of image-capturing signals in band 1 obtained by removing a frequency component equal to or lower than a first cutoff frequency from an image-capturing signal output from an image-capturing element through a band pass filter and integrating values of an image-capturing signal in band 2 obtained by removing a frequency component equal to or lower than a second cutoff frequency through a band pass filter, each in correspondence to one of a plurality of lens positions. The CPU then calculates focal point evaluation values by using these integrating values in correspondence to the individual bands. In addition, when the largest evaluation value in band 1 is judged to correspond to the closeup end position of the lens, the CPU makes a decision as to whether or not a focus match is achieved at the closeup end. The CPU uses an adjacent difference in band 1 at the closeup end, an adjacent difference ratio and an adjacent difference in band 1 at points next to the closeup end in the decision-making.
Tags:
Description:
Amusing 0%
Clever 0%
Complex 0%
Efficient 0%
Historic 0%
Important 0%
Innovative 0%
Interesting 0%
Practical 0%
Simple 0%
Number of Claims:
18
Comments:
no comments yet
Owner
Published
March 17, 2009
Application Number
10/777,090
Filed
February 13, 2004
US Classification
348/354   348/349 348/355
Int'l Classification
G03B   13/00   (20060101)   H04N   5/232   (20060101)  
Examiner
Assistant Examiner
Attorney/Law Firm
USPTO Field of Search
348/354   348/355   348/356   348/335   348/345  
Related Patents
Claims
Description
About| FAQs| Terms & Disclaimer| Link to Us| Contact Us