sod_img sod_equalize_histogram(sod_img input);
Equalize the image histogram. 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 histogram equalization should look like the following:
After Processing via sod_equalize_histogram()
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.