sod_img sod_threshold_image(sod_img input, float thresh);
threshold value. If the pixel intensity at a given location is greater than this threshold, the pixel value is set to 1 (i.e. White). Otherwise, it is set to 0 (i.e. Black).
Binary image whose pixels have only two possible intensity value (i.e. black or white) 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.