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Edge detection.

Figure 6-8 show the result of performing edge detection on the arm image and introducing a measure of significance by integrating the measure of edge strength along each connected edge curve. As can be seen, coarse scales are selected for the diffuse edge structures due to illumination effects, whereas fine scales are selected for the sharp edges due to object boundaries. Notably, the selected scale levels vary substantially along the shadow of the arm, which is necessary to obtain a good trade-off in the inherent conflict between detection and localization properties.

  
Figure 6: Results of edge detection with automatic scale selection on the arm image (all edges).

  
Figure 7: The 50 and 10 most significant edge curves as ranked on the integrated measure of edge strength along each connected edge curve.

  
Figure 8: Three-dimensional view of the 10 most significant edge curves drawn in three-dimensional scale-space with the selected scale represented as the height over the image plane.