Method of automatic object detection in image
First Claim
1. A method of automatic object detection comprising:
- obtaining an electrical signal corresponding to an illuminance of an image formed through a focusing lens with a photoelectric detector;
dividing the image into a plurality of subdivision areas;
calculating for each of the subdivision areas a focus evaluation value representative of high frequency component contained in the electrical signal;
calculating an object distance for each of the subdivision areas based on the focus evaluation value so as to select a target object based on the object distance;
focusing the target object by moving the focusing lens; and
re-selecting the target object to be focused when a new object having an object distance smaller than the object distance of the target object is detected in a remote subdivision area having an object distance greater than the object distance of the target object during said focusing.
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Accused Products
Abstract
An image is divided into a plurality of subdivision areas. A focus evaluation value representative of the high frequency component contained in the electrical signal from the CCD is calculated for each of the subdivision areas. The object distance is calculated for the respective subdivision areas based on the focus evaluation value. A target object is extracted based on the calculated object distance. The target object is focused. During the focusing operation, when a new object having an object distance smaller than that of the target object is detected in any of remote subdivision areas which have an object distance larger than that of the target object, the target object is re-selected.
104 Citations
6 Claims
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1. A method of automatic object detection comprising:
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obtaining an electrical signal corresponding to an illuminance of an image formed through a focusing lens with a photoelectric detector; dividing the image into a plurality of subdivision areas; calculating for each of the subdivision areas a focus evaluation value representative of high frequency component contained in the electrical signal; calculating an object distance for each of the subdivision areas based on the focus evaluation value so as to select a target object based on the object distance; focusing the target object by moving the focusing lens; and re-selecting the target object to be focused when a new object having an object distance smaller than the object distance of the target object is detected in a remote subdivision area having an object distance greater than the object distance of the target object during said focusing. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification