Hands-On Machine Learning with C++

Using Dlib

Dlib is another popular library for image processing. This library has different types used for math routines and image processing. The library documentation recommends using the Dlib::array2d type for images. The Dlib::array2d type is a template type that has to be parametrized with a pixel type. Pixel types in the Dlib library are defined with pixel-type traits. There are the following predefined pixel types: rgb_pixel, bgr_pixel, rgb_alpha_pixel, hsi_pixel, lab_pixel, and any scalar type can be used for the grayscaled pixels' representation.

We can use the load_image() function to load an image from disk, as follows:

#include <Dlib/image_io.h>#include <Dlib/image_transforms.h>using namespace Dlib;...array2d<rgb_pixel> img; ...