In-focus detecting device
First Claim
Patent Images
1. An in-focus detecting device comprising:
- a) detecting means for detecting a width of a color transition area of a photographed object on the basis of color components of a video signal obtained from said color transition area; and
b) in-focus determining means for determining an in-focus state on the basis of an output of said detecting means.
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Abstract
An in-focus detecting device is arranged to detect the width of a color transition area of an object image from the color components of a video signal and to determine an in-focus state by evaluating the width.
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Citations
24 Claims
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1. An in-focus detecting device comprising:
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a) detecting means for detecting a width of a color transition area of a photographed object on the basis of color components of a video signal obtained from said color transition area; and b) in-focus determining means for determining an in-focus state on the basis of an output of said detecting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A television camera comprising:
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a) image sensing means for sensing an image of a photographed object and for producing an image sensing signal; b) detecting means for detecting, from said image sensing signal, color information obtained from a color transition area in which a color of the object varies; and c) determining means for determining an in-focus state on the basis of an output of said detecting means. - View Dependent Claims (10, 11, 12, 13)
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14. An in-focus detecting device comprising:
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a) detecting means for detecting color information from a portion of a video signal corresponding to a color transition area of an object; b) computing means for performing a predetermined computing operation on said color information detected by said detecting means, and for producing, as a focus signal, information on a width of said color transition area which varies with an in-focus state; and c) determining means for determining an in-focus state on the basis of a change in said information on the width of said color transition area computed by said computing means. - View Dependent Claims (15, 16, 17, 18)
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19. A video camera apparatus comprising:
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a) image sensing means for sensing an image of a photographed object and for producing an image sensing signal; b) memory means for storing one picture amount of said image sensing signal produced by said image sensing means; c) detecting means for detecting, from said image sensing signal through said memory means, color signal information obtained from a color transition area in which a color of the object varies; d) computing means for computing, on the basis of an output of said detecting means, information on a width of said color transition area; and e) focus adjusting means for adjusting focus according to said information on the width output from said computing means. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification