Method and system for double feed detection
First Claim
1. A method for detecting overlapped flat objects in a sequence of flat objects, the flat objects having at least one of their edges exposed for viewing as they pass along a feed path, said method comprising:
- selecting a flat object in said feed path;
capturing a digital image of said exposed edges of said selected flat object;
processing at least a portion of said captured image encompassing said edges to determine a pixel density variation in a direction across said edges;
analyzing said pixel density variation to identify maxima and minima in said variation, wherein a start of an edge is identified by a maximum and an end of an edge is identified by a minimum; and
counting said maxima and minima to output an indication of a number of edges in said image.
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Abstract
A system for detecting overlapped flat objects in a sequence of flat objects have at least one of their edges exposed for viewing as they pass along a feed path. The system includes a sensor for generating a signal in response to detecting a flat object in the feed path and a camera responsive to the signal for capturing a digital image of the exposed edges of the detected flat object in the feed path. A vision system is coupled to the camera for receiving the digital image. The vision system analyzes at least a portion of the image to determine a pixel density variation along a direction perpendicular to the edges and uses the pixel density variation to output an indication of the number of edges in the image.
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Citations
25 Claims
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1. A method for detecting overlapped flat objects in a sequence of flat objects, the flat objects having at least one of their edges exposed for viewing as they pass along a feed path, said method comprising:
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selecting a flat object in said feed path;
capturing a digital image of said exposed edges of said selected flat object;
processing at least a portion of said captured image encompassing said edges to determine a pixel density variation in a direction across said edges;
analyzing said pixel density variation to identify maxima and minima in said variation, wherein a start of an edge is identified by a maximum and an end of an edge is identified by a minimum; and
counting said maxima and minima to output an indication of a number of edges in said image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for detecting overlapped flat objects in a sequence of flat objects, said flat objects having at least one of their edges exposed for viewing as they pass along a feed path, said system comprising:
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a sensor for generating a signal in response to detecting a flat object in said feed path;
a camera responsive to said signal for capturing a digital image of said exposed edges of said detected flat object in said feed path; and
,a vision system coupled to said camera for receiving said digital image;
said vision system analyzing at least a portion of said image to determine a pixel density variation along a direction perpendicular to said edges and using said pixel density variation to output an indication of a number of edges in said image. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification