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Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns
13:44

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Published on: August 30, 2013

Shift-and-scale-invariant pattern recognition using an elliptic coordinate-transformed phase-only filter.

J García, T Szoplik, C Ferreira

    Applied Optics
    |August 21, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel phase-only filter offers shift-and-scale invariance for object recognition. This advanced filter effectively identifies objects within a 0.83 to 1.25 size range, enhancing discrimination capabilities.

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    Area of Science:

    • Optics and Photonics
    • Image Processing
    • Pattern Recognition

    Background:

    • Traditional filters struggle with variations in object scale and position.
    • Phase-only filters offer advantages in certain pattern recognition tasks.

    Purpose of the Study:

    • To propose a new shift-and-scale-invariant filter.
    • To enhance object recognition capabilities, particularly for varying object sizes.

    Main Methods:

    • A three-step filter construction: complex conjugate of target spectrum, phase extraction, and elliptic coordinate transformation.
    • Analysis of discrimination abilities and Horner efficiencies for filter variations.

    Main Results:

    • The proposed filter demonstrates shift-and-scale invariance.
    • Effective recognition of objects within a scale range of 0.83 to 1.25 (scale ratio 1:1.5).

    Conclusions:

    • The elliptic coordinate-transformed phase-only filter provides robust object recognition across scale variations.
    • The filter shows promise for improving pattern recognition systems.