mirror of https://github.com/davisking/dlib.git
127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
/*
|
|
|
|
This is an example illustrating the use of the GUI API as well as some
|
|
aspects of image manipulation from the dlib C++ Library.
|
|
|
|
|
|
This is a pretty simple example. It takes a BMP file on the command line
|
|
and opens it up, runs a simple edge detection algorithm on it, and
|
|
displays the results on the screen.
|
|
*/
|
|
|
|
|
|
|
|
#include "dlib/gui_widgets.h"
|
|
#include "dlib/image_io.h"
|
|
#include "dlib/image_transforms.h"
|
|
#include <fstream>
|
|
|
|
|
|
using namespace std;
|
|
using namespace dlib;
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
class win : public drawable_window
|
|
{
|
|
/*
|
|
Here we are making a GUI window that will be capable of displaying
|
|
an image.
|
|
*/
|
|
public:
|
|
|
|
template <typename image_type>
|
|
win(
|
|
const image_type& img
|
|
) :
|
|
gui_img(*this)
|
|
{
|
|
// set the size of this window to match the size of the input image
|
|
set_size(img.nc(),img.nr());
|
|
|
|
// Now load the image into the image widget so it has something to display.
|
|
gui_img.set_image(img);
|
|
|
|
set_title("image example");
|
|
|
|
// show this window on the screen
|
|
show();
|
|
}
|
|
|
|
~win(
|
|
)
|
|
{
|
|
// You should always call close_window() in the destructor of window
|
|
// objects to ensure that no events will be sent to this window while
|
|
// it is being destructed.
|
|
close_window();
|
|
}
|
|
|
|
private:
|
|
|
|
image_widget gui_img;
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|
|
int main(int argc, char** argv)
|
|
{
|
|
try
|
|
{
|
|
// make sure the user entered an argument to this program
|
|
if (argc != 2)
|
|
{
|
|
cout << "error, you have to enter a BMP file as an argument to this program" << endl;
|
|
return 1;
|
|
}
|
|
|
|
ifstream fin(argv[1],ios::binary);
|
|
if (!fin)
|
|
{
|
|
cout << "error, can't find " << argv[1] << endl;
|
|
return 1;
|
|
}
|
|
|
|
// Here we declare an image object that can store rgb_pixels. Note that in
|
|
// dlib there is no explicit image object, just a 2D array and
|
|
// various pixel types.
|
|
array2d<rgb_pixel>::kernel_1a img;
|
|
|
|
// now load the bmp file into our image. If the file isn't really a BMP
|
|
// or is corrupted then load_bmp() will throw an exception.
|
|
load_bmp(img, fin);
|
|
|
|
// Now lets use some image functions. This example is going to perform
|
|
// simple edge detection on the image. First lets find the horizontal and
|
|
// vertical gradient images.
|
|
array2d<short>::kernel_1a horz_gradient, vert_gradient;
|
|
array2d<unsigned char>::kernel_1a edge_image;
|
|
sobel_edge_detector(img,horz_gradient, vert_gradient);
|
|
|
|
// now we do the non-maximum edge suppression step so that our edges are nice and thin
|
|
suppress_non_maximum_edges(horz_gradient, vert_gradient, edge_image);
|
|
|
|
// Now we would like to see what our images look like. So lets use our
|
|
// window to display them on the screen.
|
|
|
|
|
|
// create a window to display the edge image
|
|
win my_window(edge_image);
|
|
|
|
// also make a window to display the original image
|
|
win my_window2(img);
|
|
|
|
// wait until the user closes both windows before we let the program
|
|
// terminate.
|
|
my_window.wait_until_closed();
|
|
my_window2.wait_until_closed();
|
|
}
|
|
catch (exception& e)
|
|
{
|
|
cout << "exception thrown: " << e.what() << endl;
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------
|
|
|