sod_img sod_otsu_binarize_image(sod_img input);
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.