Photographic optical system controlling apparatus
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorYoshihiro Nishida
Life of this patent
Estimating the term…
Abstract
A photographic optical system controlling apparatus for carrying out an automatic focusing control and an exposure control. The apparatus comprises a motion vector detecting means 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.
Claims39
An exposure controlling apparatus for controlling exposure in an optical system based on an image signal obtained at a photometric area designated on a photographic screen, said apparatus comprising:
- (a) motion vector detecting means for detecting the motion of an image in a motion vector detecting area from the correlation of two time continuous frames of image data;
- (b) photometric area controlling means for detecting the motion of a main object from the output of said motion vector detecting means, and for controlling this photometric area to follow the motion of the main object;
- (c) judging means for judging if the main object occupies a part or the majority of the screen;
- (d) area changing means, responsive to said judging means, for changing the motion vector detecting area and the photometric area.
An exposure controlling apparatus for controlling exposure in an optical system based on an image signal obtained at a photometric 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;
- and
- (b) photometric area controlling means for detecting the motion of a main object from the output of said motion vector detecting means, and for moving the photometric area to follow the motion of the main object.
An exposure controlling apparatus for controlling exposure in an optical system based on an image signal obtained at a photometric 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) photometric area controlling means for detecting the motion of a main object from the output of said motion vector detecting means, and for moving the photometric area to follow the motion of the main object;
- and
- (c) photometric area designating means for designating the photometric area in accordance with the main object to be followed.
An exposure controlling apparatus for controlling exposure in an optical system based on an image signal obtained at a photometric 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) photometric area controlling means for detecting the motion of a main object from the output of said motion vector detecting means, and for moving the photometric area to follow the motion of the main object;
- and
- (c) photometric area superimposing means for superimposing the photometric area on the image signal, and displaying the superimposed signal.
An exposure controlling apparatus for automatically controlling exposure in an optical system on the basis of image signals obtained in a photometric area designated on a photographic screen, said apparatus comprising:
- (a) motion vector detecting means for detecting motion of an image by correlating pixel density values of two time continuous frames of image data and accumulatively adding the correlated pixel density values to create a motion vector;
- and
- (b) photometric area controlling means for detecting the motion of a main object from the motion vector and for controlling the movement of the photometric area to follow the detected motion of the main object.
In a photographic instrument, a method for controlling exposure of an image, comprising:
- (a) measuring light intensity of each of a plurality of image areas selected from said image;
- (b) determining an average value of light intensity of the measured light intensities of a sub-group of image areas selected from said plurality of image areas;
- (c) determining the percentage of image areas of said plurality of image areas which fall within a continuous range of light intensities, said range including said average value;
- (d) controlling exposure in said photographic instrument in response to the determined percentage.
Dependencies are inferred from the claim text.