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Definition
Edge detection is the process of label the image pixels that lie on the boundaries where abrupt intensity discontinuity occur.
Background
The light projected from a visual scene into an eye or camera is typically piecewise smooth as a function of visual angle. Since nearby points on a surface tend to have similar attitude, reflectance, and illumination, the pixels to which these surface points project tend to have similar intensity. This rule is broken when two adjacent pixels project from points on either side of an occlusion boundary, since the points now project from different surfaces that may well have different attitude, reflectance, and illumination, and typically an abrupt change in image intensity results. Intensity edges also arise when neighboring pixels project from points on the same surface that happens to straddle a surface crease, pigment change, or shadow boundary.
Since these abrupt changes in image...
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Elde, J.H. (2014). Edge Detection. In: Ikeuchi, K. (eds) Computer Vision. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-31439-6_217
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DOI: https://doi.org/10.1007/978-0-387-31439-6_217
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