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Streak and spot detection in digital pictures

Streak and spot detection in digital pictures

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A procedure is discussed for detecting dark streaks and spots (intensity anomalies) in a digital picture. The algorithm is insensitive to intensity cliffs and plateaux edges, and it can be finely ‘tuned’ to accept anomalies of a given size while rejecting others. It has been successfully applied to the detection of scratches on the internal surfaces of hydraulics cylinders and results were presented in an earlier paper. The present article discusses the properties of the algorithm and demonstrates its behaviour on a test picture.

References

    1. 1)
      • Batchelor, B.G., Williams, G.A.: `Defect detection on the internal surfaces of hydraulics cylinders', Proceedings of the SPIE technical symposium east, April 1978, Washington.
    2. 2)
      • B.G. Batchelor . Interactive image analysis as a prototyping tool for industrial inspection. IEEE J. Computers & Digital Techniques , 61 - 69
    3. 3)
      • M.J.B. Duff , B.G. Batchelor . (1978) Parallel processing techniques, Pattern recognition, ideas in practice.
    4. 4)
      • W.K. Pratt . (1978) , Digital image processing.
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