Photographic optical system controlling apparatus
AssigneeMitsubishi Denki Kabushiki
InventorYoshihiro Nishida
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Abstract
A photographic optical system controlling apparatus carries for out an automatic focusing control and an exposure control. The apparatus includes a motion vector detecting device for detecting the motion of the image and changes a gate area or a photometric area. The result is that the focusing or the exposure controlling operation can be carried out accurately following the motion of a main object, irrespective of the positional change of the object the screen.
Claims15
An automatic focusing apparatus for automatically controlling the focusing operation of an optical system on the basis of image signals obtained in a focusing detecting area designated on a photographic screen, said apparatus comprising:
- (a) motion vector detecting means for detecting uniform motion of an image by correlating pixel density values of two time continuous image data and accumulatively adding the correlated pixel density values to create a uniform motion vector;
- and
- (b) focus detecting area controlling means for detecting the main object from the uniform motion vector and for varying the focus detecting area to follow the detected motion of the main object.
An automatic focusing apparatus for automatically controlling the focusing operation of an optical system based on an image signal obtained in a focusing detecting area designated on a photographic screen, said apparatus comprising:
- (a) motion vector detecting means for detecting the motion of an image from correlation of two time continuous frames of image data;
- (b) gate area controlling means for detecting a main object from an output of said motion vector detecting means, and for controlling a gate area to follow the detected motion of the main object;
- (c) gate area superimposing means for superimposing a moveable focusing detecting area on the image signal, and displaying the superimposed signal;
- and
- (d) gate area designating means for allowing manual shifting of the moveable focusing detecting area by a user.
An automatic focusing apparatus for automatically controlling the focusing operation of an optical system based on an image signal obtained in a focusing detecting area designated on a photographic screen, said apparatus comprising:
- (a) motion vector detecting means for detecting the motion of an image from the correlation of two time continuous frames of image data;
- (b) gate area controlling means for detecting a main object from an output of said motion vector detecting means, and for controlling a gate area to follow the detected motion of the main object;
- (c) judging means for judging the main object as occupying one of a part and a majority of the screen;
- and
- (d) area changing means for varying the motion vector detecting area in accordance with contents of the image so as to detect the motion vector, from the image on entire screen when the main object is judged to occupy the majority of the screen, and from only a portion of the image in a vicinity of the focusing detecting area when the main object is judged to occupy only a part of the screen less than a majority.
Dependencies are inferred from the claim text.