Shape detection apparatus
First Claim
1. A shape detection apparatus for detecting the shape of an object (Ob) comprising:
- a digital image signal producing means (1) for producing a digital image signal (Sv) indicative of an object image (Sc1) of the object (Ob);
an approximate position detecting means (33 and
11) for producing a designated scanning window (Sc2) configured in a shape having an outline conforming to the outline of object (Ob);
an edge point detecting means (12) for defining a plurality of sampling line windows (4 and
14) having a predetermined length (L), each sampling line window being provided to intersect the outline of the designated scanning window (Sc2) at a center point (15a-15h) of the sampling line window for detecting the image density and determining edge points (17, 18, 19,
25) of the object (Ob); and
an object detection means (11,
13) for detecting the shape of the object (Ob) by scanning the digital image signal (Sv) to compare the object image (Sc1) with the designated scanning window (Sc2) and to produce a first position signal (Sc3), indicative of the position of the object (Ob) and a second position signal (Sc4) indicative of said determined edge points (17, 18, 19,
25), when a predetermined number of the center points (15a-15h) coincide with the edge points (17, 18, 19,
25).
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Abstract
A shape detection apparatus able to accurately detect the image position of a target object even when the shape of the scanning window does not match the shape of the image of the target, and even when the scanning position of the scanning window does not precisely match the image position of the target is provided. This shape detection apparatus comprises a video image producer; an image memory; an approximate position evaluator for evaluating the approximate position of the image of the target; an edge point detector for defining plural sampling line windows having a predetermined length for detecting the image density at the detected approximate position of the image, and detecting image density edge points in these sampling line windows as the contour point positions of the target image; and a detection window setter for setting the contour lines of the target image from the detected contour point positions.
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Citations
13 Claims
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1. A shape detection apparatus for detecting the shape of an object (Ob) comprising:
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a digital image signal producing means (1) for producing a digital image signal (Sv) indicative of an object image (Sc1) of the object (Ob); an approximate position detecting means (33 and
11) for producing a designated scanning window (Sc2) configured in a shape having an outline conforming to the outline of object (Ob);an edge point detecting means (12) for defining a plurality of sampling line windows (4 and
14) having a predetermined length (L), each sampling line window being provided to intersect the outline of the designated scanning window (Sc2) at a center point (15a-15h) of the sampling line window for detecting the image density and determining edge points (17, 18, 19,
25) of the object (Ob); andan object detection means (11,
13) for detecting the shape of the object (Ob) by scanning the digital image signal (Sv) to compare the object image (Sc1) with the designated scanning window (Sc2) and to produce a first position signal (Sc3), indicative of the position of the object (Ob) and a second position signal (Sc4) indicative of said determined edge points (17, 18, 19,
25), when a predetermined number of the center points (15a-15h) coincide with the edge points (17, 18, 19,
25). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification