Edge Detection II

Building the Cantata Workspace

1. Read image gull.viff and display it using operators User defined and Display Image.
2. Perform edge detection by executing different gradients on the image. Use operator Gradient Operator selecting the square root of the squares of the X and Y gradients (Euclidean Distance).
   Note: The results of the gradient operators can be very high at some points, being largen than 255, so it is important to convert the input image to an appropriate pixel data type to get the proper results. After the gradient, it is possible to clip the values or normalize the image.
3. Display the results.

Exercises

• Clip the results to 255 or normalize the results to 255. Compare and comment.
• Take the difference between the Sobel and Isotropic operators. Comment on the results. In whic portions of the image the difference must be small or larger?