Edge-Detector Resolution Improvement by Image Interpolation

Most step-edge detectors are designed to detect locally straight edge-segments which can be isolated within the operator kernel. While it can easily be demonstrated that a cross-sectional support of at least 4 pixels is required for the unambiguous detection of a stepedge, edges which cannot be isol...

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Bibliographic Details
Published inIEEE transactions on pattern analysis and machine intelligence Vol. PAMI-9; no. 3; pp. 446 - 451
Main Author Nalwa, Vishvjit S.
Format Journal Article
LanguageEnglish
Published United States IEEE 01.05.1987
Subjects
Biomedical computing
Computer applications
Detectors
Digital image processing
edge-detection
Graphics
Image edge detection
image interpolation
Image processing
Image resolution
image segmentation
Interpolation
Kernel
resolution improvement
Search methods
step-edges and line-edges
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ISSN0162-8828
DOI10.1109/TPAMI.1987.4767926

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Summary:Most step-edge detectors are designed to detect locally straight edge-segments which can be isolated within the operator kernel. While it can easily be demonstrated that a cross-sectional support of at least 4 pixels is required for the unambiguous detection of a stepedge, edges which cannot be isolated within windows having this width can nevertheless be resolved. This is achieved by preceding the stepedge detection process by image-intensity interpolation. Although resolution can be improved in this fashion, the step-edge position and intensity estimates thus determined may be subject to systematic biases. Also, the higher resolution performance is accompanied by lower robustness to noise.
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ISSN:0162-8828
DOI:10.1109/TPAMI.1987.4767926