Visual inspection of metal surfaces
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The majority of applications of automatic visual inspection have been the case in which a high contrast image can be obtained. This will result from object silhouettes 1 and high contrast reflectivity changes as in printed text. In these cases, the image can usually be successfully segmented by a threshold operation 2 , 3 leading to a two-level or binary image.
[1] P. Beckmann,et al. The scattering of electromagnetic waves from rough surfaces , 1963 .
[2] Azriel Rosenfeld,et al. Picture Processing by Computer , 1969, CSUR.
[3] Azriel Rosenfeld,et al. A Threshold Selection Technique , 1974, IEEE Transactions on Computers.