Apparatus for detecting an object using a differential image
First Claim
1. An object detecting apparatus comprising:
- imaging means for imaging an object;
extracting means for extracting edge images from image signals supplied from said imaging means;
forming means for forming a differential image between a first of the edge images and a second of the edge images as extracted from image signals based on images that have been imaged by the imaging means at different times;
refining means for dividing the differential image into a predetermined plurality of image areas, each of said plurality of image areas containing a plurality of pixels wherein each of said image area has a value associated therewith; and
detecting means for detecting a state of the object on the basis of a comparison between the value of each of said image areas and a threshold value.
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Abstract
An object detecting apparatus including an imaging section, an extracting section for extracting edge images from image signals supplied from the imaging section, a forming section for forming a differential image between a first edge image extracted from an image signal that has been picked up for an object at a certain time and a second edge image extracted from an image signal that has been picked up for the same object at a later time, and a detecting section for detecting the object on the basis of the differential image. With the object detecting apparatus, portions of a background without motion that are contained in the edge images are eliminated to produce edge images that only relate to the object that is substantially in motion. As a result, information can be efficiently obtained that relates to the state, position and otherwise of the object in motion.
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Citations
12 Claims
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1. An object detecting apparatus comprising:
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imaging means for imaging an object;
extracting means for extracting edge images from image signals supplied from said imaging means;
forming means for forming a differential image between a first of the edge images and a second of the edge images as extracted from image signals based on images that have been imaged by the imaging means at different times;
refining means for dividing the differential image into a predetermined plurality of image areas, each of said plurality of image areas containing a plurality of pixels wherein each of said image area has a value associated therewith; and
detecting means for detecting a state of the object on the basis of a comparison between the value of each of said image areas and a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An object detecting apparatus comprising:
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an imaging device for imaging an object;
an extracting module for extracting edge images from image signals supplied from said imaging means;
a forming module for forming a differential image between a first of the edge images containing a first edge image of the object and a second of the edge images containing a second edge image of the object as extracted from the image signals based on images of the object that have been imaged by the imaging means at different times;
a refining module for dividing the differential image into a predetermined plurality of image areas, each of said plurality of image areas containing a plurality of pixels wherein each of said image areas has a value associated; and
a detecting module for detecting motion of the object on the basis of a comparison between values obtained from each of said image areas in the differential image and a threshold value. - View Dependent Claims (10, 11, 12)
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Specification