void rotate_dataset(const command_line_parser& parser)
{
image_dataset_metadata::dataset metadata;
const string datasource = parser[0];
load_image_dataset_metadata(metadata,datasource);
double angle = get_option(parser, "rotate", 0);
// Set the current directory to be the one that contains the
// metadata file. We do this because the file might contain
// file paths which are relative to this folder.
set_current_dir(get_parent_directory(file(datasource)));
const string file_prefix = "rotated_"+ cast_to_string(angle) + "_";
const string metadata_filename = get_parent_directory(file(datasource)).full_name() +
directory::get_separator() + file_prefix + file(datasource).name();
array2d<rgb_pixel> img, temp;
for (unsigned long i = 0; i < metadata.images.size(); ++i)
{
file f(metadata.images[i].filename);
const string filename = get_parent_directory(f).full_name() + directory::get_separator() + file_prefix + to_png_name(f.name());
load_image(img, metadata.images[i].filename);
const point_transform_affine tran = rotate_image(img, temp, angle*pi/180);
save_png(temp, filename);
for (unsigned long j = 0; j < metadata.images[i].boxes.size(); ++j)
{
const rectangle rect = metadata.images[i].boxes[j].rect;
rectangle newrect;
newrect += tran(rect.tl_corner());
newrect += tran(rect.tr_corner());
newrect += tran(rect.bl_corner());
newrect += tran(rect.br_corner());
// now make newrect have the same area as the starting rect.
double ratio = std::sqrt(rect.area()/(double)newrect.area());
newrect = centered_rect(newrect, newrect.width()*ratio, newrect.height()*ratio);
metadata.images[i].boxes[j].rect = newrect;
// rotate all the object parts
std::map<std::string,point>::iterator k;
for (k = metadata.images[i].boxes[j].parts.begin(); k != metadata.images[i].boxes[j].parts.end(); ++k)
{
k->second = tran(k->second);
}
}
metadata.images[i].filename = filename;
}
save_image_dataset_metadata(metadata, metadata_filename);
}
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;
}
// 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> img;
// Now load the image file into our image. If something is wrong then
// load_image() will throw an exception. Also, if you linked with libpng
// and libjpeg then load_image() can load PNG and JPEG files in addition
// to BMP files.
load_image(img, argv[1]);
// get the 100 strongest SURF points from the image
std::vector<surf_point> sp = get_surf_points(img, 100);
// create a window to display the input image and the SURF boxes. (Note that
// you can zoom into the window by holding CTRL and scrolling the mouse wheel)
image_window my_window(img);
// Now lets draw some rectangles on top of the image so we can see where
// SURF found its points.
for (unsigned long i = 0; i < sp.size(); ++i)
{
// Pull out the info from the SURF point relevant to figuring out
// where its rotated box should be.
const unsigned long box_size = static_cast<unsigned long>(sp[i].p.scale*20);
const double ang = sp[i].angle;
const point center(sp[i].p.center);
const rectangle rect = centered_rect(center, box_size, box_size);
// Rotate the 4 corners of the rectangle
const point p1 = rotate_point(center, rect.tl_corner(), ang);
const point p2 = rotate_point(center, rect.tr_corner(), ang);
const point p3 = rotate_point(center, rect.bl_corner(), ang);
const point p4 = rotate_point(center, rect.br_corner(), ang);
// Draw the sides of the box as red lines
my_window.add_overlay(p1, p2, rgb_pixel(255,0,0));
my_window.add_overlay(p1, p3, rgb_pixel(255,0,0));
my_window.add_overlay(p4, p2, rgb_pixel(255,0,0));
my_window.add_overlay(p4, p3, rgb_pixel(255,0,0));
// Draw a line from the center to the top side so we can see how the box is oriented.
// Also make this line green.
my_window.add_overlay(center, (p1+p2)/2, rgb_pixel(0,255,0));
}
// wait until the user closes the window before we let the program
// terminate.
my_window.wait_until_closed();
}
catch (exception& e)
{
cout << "exception thrown: " << e.what() << endl;
}
}