Edge Detection I

Building the Cantata Workspace

1. Get image $DIP/data/retina.viff and display it using operators User defined and Display Image.
2. Perform edge detection in the width and height directions by using two Linear Operators one with kernel $DIP/data/sobel_x.ascii and the other with kernel $DIP/data/sobel_y.ascii. You can visualize these kernels using the File Viewer operator. Display the both filter results. Verify that both images contains positive and negative values.
3. Take the magnitude of the gradient using the Hypotenuse operator applied to the width and height gradients.

Exercises

• Make a synthetic image with a white circle in a black background. Take the magnitude Sobel detector operator using estimates with absolute and euclidean values (using the Hypotenuse operator).
• Create a workspace to determine the Sobel gradient direction of the circle image and of the retina image.