Contour tracing and boundary detection for object identification in a digital image
First Claim
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1. A method comprising:
- receiving digital image information;
tracing the contour of an object depicted in said image information with a threshold value;
detecting the boundary of said contour traced object;
evaluating results of tracing the contour and detecting the boundary; and
adjusting the threshold value based on the results.
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Abstract
An edge detection algorithm may use contour tracing followed by boundary detection to improve the accuracy of the detected boundaries and to enable the detection of boundaries in cases where the image is either distorted or subject to the effects of noise. The contour tracing and boundary detection may result in an object identification, which if unsatisfactory, may be retried with different threshold values. A high pass gaussian filter may be applied before tracing contours, resulting in the selection of a band limited set of pixel values which are centered around a value of one half the bit depth.
111 Citations
25 Claims
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1. A method comprising:
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receiving digital image information;
tracing the contour of an object depicted in said image information with a threshold value;
detecting the boundary of said contour traced object;
evaluating results of tracing the contour and detecting the boundary; and
adjusting the threshold value based on the results. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An article comprising a medium storing instructions that cause a processor-based system to:
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trace the contour of an object depicted in image information with a threshold value;
detect the boundary of said contour traced object; and
evaluate results of contour tracing and boundary detection, and adjust the threshold value based on said results. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A digital image processing system comprising:
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a processor; and
a storage coupled to said processor, said storage storing instructions that cause a processor-based system to trace a contour of an object depicted in digital image information with a threshold value;
detect the boundary of said contour traced object;
evaluate the results of contour tracing and boundary detection; and
adjust the threshold value based on said results.- View Dependent Claims (25)
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Specification