Edge Detection Results

Edge Detection Results with EdgeDetector 1.1
After Smoothing the Original Image

The original head image was smoothed with Gaussian filters with three different sigmas (SG). When EdgeDetector 1.1 was run, the value of parameter ES was fixed at 30.0. Images in each section correspond to the LL value of 100.0, 80.0, 60.0 and 40.0 in the order of from left to righ in each row, and from top to bottom row.

As stated in the page with unsmoothed image, the main improvement of EdgeDetector 1.1 over 1.0 is that it is able to detect more edges close to one another. However, such edges tend to merge or disappear in the smoothed images. As a consequence, improvement in the results shown in this page may not be as obvious as that found in the results from the unsmoothed image. Especially with SG=1, areas with obvious improvement include: the white strip at the top of the mouth; the bow-shaped black strip over the big black area at the center of the brain; and the thin white strip at the back of the head to the southeast of the brain.