The following examples illustrate the use of the scale space for edge detection. On each scale the zerocrossings of the Laplaciaan filtered image weighted with the output of the Sobel operator are calculated. The resulting images of scale space are shown by displaying one image after the other in an MPEG-encoded sequence. The scale increases as the sequence evolves. In the scale space based on linear diffusion calculated on the image lena the noise is filtered out as the scale increases but the edges also faint. In the scale space based on non-linear diffusion calculated on the same image the noise is also filtered out as the scale increases and strong edges are preserved.
