Edge Detection Results
with EdgeDetector 1.0
After Smoothing the Original Image
The original head image was smoothed with Gaussian filters with three different sigmas (SG). When EdgeDetector 1.0 was run, the value of parameter ES was fixed at 40.0. Images in each section correspond to the LL value of 100.0, 90.0, 80.0 and 70.0 in the order of from left to righ in each row, and from top to bottom row.

Due to the foot-print of the Gaussian filter, the pixels on the four sides of the image were set to a fix value of zero after smoothing. This led to the false horizontal edges detected close to the bottom of the result images shown below.

Though the edges detected from the smoothed image look more connected, the location of these edges can not be determined as accurately as when no smoothing was applied to the original image. For projects such as Surface Reconstruction, if this type of smoothing is applied, an extra step should be taken to locate the edges in the original image.

The smoothed images: SG = 1, 2 and 3

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SG=1; LL=100.0, 90.0, 80.0 and 70.0; ES=40.0

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SG=2; LL=100.0, 90.0, 80.0 and 70.0; ES=40.0

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SG=3; LL=100.0, 90.0, 80.0 and 70.0; ES=40.0

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