ADAPTIVE APPROACH TO EDGE-DETECTION

An adaptive approach to edge detection using the transform domain and bandpass filtering is discussed. The method is also extended to 3-D an d shown to yield better edge maps. The discrete symmetric cosine trans form (DSCT) is shown to be the best transform for accurate edge detect ion. The theory is first discussed in 1-D. Then, the adaptive algorith m utilizing both the gradient and the Laplacian information is develop ed in 2-D and 3-D. Computer simulations with regular scenes and magnet ic resonance imaging images are provided. The extension of the method to 3-D leads to improved noise immunity and better edge contours.