sod_img sod_canny_edge_image(sod_img input, int reduce_noise);
Perform canny edge detection on an input image. This works only on grayscale images. If you want to convert the colorspace of your input picture to the gray color model, call sod_grayscale_image(), sod_grayscale_image_3c() before or simply load your image from disk using the macro sod_img_load_grayscale(). A typical input image after processing should look like the following:
After Processing via sod_canny_edge_image()
If true (any value different from zero), then call sod_gaussian_noise_reduce() before canny edge.
Processed image is returned in an instance of the sod_img object. if something goes wrong during processing, then an empty image is returned via sod_make_empty_image(). Once done, you must release the memory allocated to this object via sod_free_image() to avoid memory leaks.