Image-based feature detection using edge vectors
First Claim
1. An object feature tracking apparatus, comprising:
- a digital image capturing device;
a non-transitory computer readable memory storing feature detection software instructions; and
a processor coupled with the digital image capturing device and the non-transitory computer readable memory, and configured to operate as a feature detector upon execution of the software instructions, wherein the feature detector is configurable to;
obtain, via the digital image capturing device, digital image frames that comprise digital images of at least one object;
detect a plurality of edges within a plurality of frames of the digital image frames;
track, across the plurality of frames, image features based on one or more anchor points detected on at least one edge of the plurality of edges;
assign a vector for each of at least some points of a plurality of points along the at least one edge such that a plurality of vectors is associated with the at least one edge, wherein each anchor point of the one or more anchor points corresponds to a vector of the plurality of vectors, thereby defining an anchor point vector, and wherein each anchor point defines a geometric center of an analysis grid located on the at least one edge;
generate an edge similarity measure as a function of relative measures between one of the anchor point vectors and at least some of the plurality of vectors within an analysis grid that corresponds to the one of the anchor point vectors; and
retrieve data associated with the at least one object as a function of the edge similarity measure.
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Accused Products
Abstract
Techniques are provided in which a plurality of edges are detected within a digital image. An anchor point located along an edge of the plurality of edges is selected. An analysis grid associated with the anchor point is generated, the analysis grid including a plurality of cells. An anchor point normal vector comprising a normal vector of the edge at the anchor point is calculated. Edge pixel normal vectors comprising normal vectors of the edge at locations along the edge within the cells of the analysis grid are calculated. A histogram of similarity is generated for each of one or more cells of the analysis grid, each histogram of similarity being based on a similarity measure between each of the edge pixel normal vectors within a cell and the anchor point normal vector, and a descriptor is generated for the analysis grid based on the histograms of similarity.
17 Citations
23 Claims
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1. An object feature tracking apparatus, comprising:
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a digital image capturing device; a non-transitory computer readable memory storing feature detection software instructions; and a processor coupled with the digital image capturing device and the non-transitory computer readable memory, and configured to operate as a feature detector upon execution of the software instructions, wherein the feature detector is configurable to; obtain, via the digital image capturing device, digital image frames that comprise digital images of at least one object; detect a plurality of edges within a plurality of frames of the digital image frames; track, across the plurality of frames, image features based on one or more anchor points detected on at least one edge of the plurality of edges; assign a vector for each of at least some points of a plurality of points along the at least one edge such that a plurality of vectors is associated with the at least one edge, wherein each anchor point of the one or more anchor points corresponds to a vector of the plurality of vectors, thereby defining an anchor point vector, and wherein each anchor point defines a geometric center of an analysis grid located on the at least one edge; generate an edge similarity measure as a function of relative measures between one of the anchor point vectors and at least some of the plurality of vectors within an analysis grid that corresponds to the one of the anchor point vectors; and retrieve data associated with the at least one object as a function of the edge similarity measure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification