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datset.cpp
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datset.cpp
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#include <opencv2/opencv.hpp>
#include <filesystem>
#include <math.h>
#include <random>
#include <chrono>
#include <fstream>
using namespace std;
void overlayImage(cv::Mat &src, cv::Mat &overlay, const cv::Point& location) {
for (int y = max(location.y, 0); y < src.rows; ++y)
{
int fY = y - location.y;
if (fY >= overlay.rows)
break;
for (int x = max(location.x, 0); x < src.cols; ++x)
{
int fX = x - location.x;
if (fX >= overlay.cols)
break;
double opacity = ((double)overlay.data[fY * overlay.step + fX * overlay.channels() + 3]) / 255;
for (int c = 0; opacity > 0 && c < src.channels(); ++c)
{
unsigned char overlayPx = overlay.data[fY * overlay.step + fX * overlay.channels() + c];
unsigned char srcPx = src.data[y * src.step + x * src.channels() + c];
src.data[y * src.step + src.channels() * x + c] = srcPx * (1. - opacity) + overlayPx * opacity;
}
}
}
}
cv::Mat clearBg(cv::Mat plate) {
cv::Mat tmp, alpha, dst;
cv::cvtColor(plate,tmp,cv::COLOR_BGR2GRAY);
cv::threshold(tmp,alpha,1,255,cv::THRESH_BINARY);
cv::Mat rgb[3];
cv::split(plate,rgb);
cv::Mat rgba[4]={rgb[0],rgb[1],rgb[2],alpha};
cv::merge(rgba,4,dst);
return dst;
}
void rotateImage(const cv::Mat &input,cv::Mat &output, double alpha, double beta, double gamma, double dx, double dy, double dz, double f) {
alpha = (alpha)*CV_PI/180.;
beta = (beta)*CV_PI/180.;
gamma = (gamma)*CV_PI/180.;
// get width and height for ease of use in cv::Matrices
double w = (double)input.cols;
double h = (double)input.rows;
// Projection 2D -> 3D cv::Matrix
cv::Mat A1 = (cv::Mat_<double>(4,3) <<
1, 0, -w/2.,
0, 1, -h/2.,
0, 0, 0,
0, 0, 1);
// Rotation cv::Matrices around the X, Y, and Z axis
cv::Mat RX = (cv::Mat_<double>(4, 4) <<
1, 0, 0, 0,
0, cos(alpha), -sin(alpha), 0,
0, sin(alpha), cos(alpha), 0,
0, 0, 0, 1);
cv::Mat RY = (cv::Mat_<double>(4, 4) <<
cos(beta), 0, -sin(beta), 0,
0, 1, 0, 0,
sin(beta), 0, cos(beta), 0,
0, 0, 0, 1);
cv::Mat RZ = (cv::Mat_<double>(4, 4) <<
cos(gamma), -sin(gamma), 0, 0,
sin(gamma), cos(gamma), 0, 0,
0, 0, 1, 0,
0, 0, 0, 1);
// Composed rotation cv::Matrix with (RX, RY, RZ)
cv::Mat R = RX * RY * RZ;
// Translation cv::Matrix
cv::Mat T = (cv::Mat_<double>(4, 4) <<
1, 0, 0, dx,
0, 1, 0, dy,
0, 0, 1, dz,
0, 0, 0, 1);
// 3D -> 2D cv::Matrix
cv::Mat A2 = (cv::Mat_<double>(3,4) <<
f, 0, w/2, 0,
0, f, h/2, 0,
0, 0, 1, 0);
// Final transforcv::Mation cv::Matrix
cv::Mat trans = A2 * (T * (R * A1));
// Apply cv::Matrix transforcv::Mation
cv::Mat bordered;
cv::copyMakeBorder(input, bordered, input.rows, input.rows, input.cols*.3, input.cols*.3, cv::BORDER_CONSTANT, cv::Scalar(0,0,0));
cv::warpPerspective(bordered, output, trans, bordered.size(), cv::INTER_LANCZOS4);
}
list<cv::Mat> randomWarps(cv::Mat plate, int n) {
list<cv::Mat> warps;
random_device rd; //Will be used to obtain a seed for the random number engine
mt19937 gen(rd());
uniform_real_distribution<> realgen(-1.f, 1.f);
for (int i =0; i<n; i++) {
gen.seed(rd());
auto xangl = realgen(gen)*25.;
auto yangl = realgen(gen)*25.;
auto zangl = realgen(gen)*10.;
cv::Mat platew, respl, grey, res;
rotateImage(plate, platew, xangl, yangl,zangl, 0,0,300, 200);
cv::cvtColor(platew, grey, cv::COLOR_BGR2GRAY);
res = platew(cv::boundingRect(grey));
warps.push_back(clearBg(res));
}
return warps;
}
cv::Mat loadRandomImage(string path) {
using fp = bool (*)(const filesystem::path&);
auto nfiles = count_if(filesystem::directory_iterator(path), filesystem::directory_iterator{}, (fp)filesystem::is_regular_file);
random_device rd;
mt19937 gen(rd());
uniform_int_distribution<> intgen(0, nfiles-1);
auto n = intgen(gen);
int i=0;
string s;
for (const auto & file: filesystem::directory_iterator(path)) {
if (i == n) {
s = file.path();
break;
}
i++;
}
auto back = cv::imread(s);
return back;
}
void generateDatasetImages(string plate_path, string backgr_path, string output_folder, int image_size, double plate_scale, int nwarps){
static int imagenum;
filesystem::create_directory(output_folder);
random_device rd; //Will be used to obtain a seed for the random number engine
mt19937 gen(rd());
uniform_int_distribution<> intgen(1, image_size-plate_scale*image_size);
uniform_real_distribution<> realgen(0.8, 1);
auto plate = cv::imread(plate_path, cv::IMREAD_UNCHANGED);
cv::Mat blured;
int ksize = (plate.rows/2)%2==0 ? plate.rows/2+1 : plate.rows/2;
cv::GaussianBlur(plate, blured, cv::Size(ksize,ksize), cv::BORDER_DEFAULT);
auto wrps = randomWarps(blured, nwarps);
for (auto& plt: wrps) {
imagenum++;
string name = output_folder+"/" + to_string(imagenum);
ofstream file;
auto back = loadRandomImage(backgr_path);
file.open(name + ".txt");
cv::Mat resplt,resbg;
gen.seed(rd());
auto scale = realgen(gen)*plate_scale*image_size/plt.cols;
int x = intgen(gen);
int y = intgen(gen);
int width = scale*plt.cols;
int hight = scale*plt.rows;
double yolo_x = double(x+width/2)/image_size;
double yolo_y = double(y+hight/2)/image_size;
double yolo_w = double(width)/image_size;
double yolo_h = double(hight)/image_size;
file <<"1 "<<yolo_x<<" "<<yolo_y<<" "<<yolo_w<<" "<<yolo_h<<endl;
file.close();
cv::resize(back, resbg, cv::Size(image_size,image_size));
cout<<"back"<<endl;
cv::resize(plt, resplt, cv::Size(scale*plt.cols, scale*plt.rows));
cout<<"front"<<endl;
overlayImage(resbg, resplt, cv::Point(x,y));
cv::imwrite(name + ".png", resbg);
}
}
int main(int argc, char const *argv[]) {
if (argc<6) {
cout<<"Usage: datset /path/to/plates/ /path/to/background/ ./output_path output_image_size scale_factor number_of_warps\n";
return -1;
}
string plates_path = string(argv[1]);
string backgr_path = string(argv[2]);
string output_path = string(argv[3]);
int image_size = atoi(argv[4]);
double plate_scale = atof(argv[5]);
string platp;
for (const auto & entry : filesystem::directory_iterator(plates_path)) {
auto ext = entry.path().filename().extension();
if (ext == ".jpg" || ext ==".png") {
platp = entry.path();
generateDatasetImages(platp, backgr_path, output_path, image_size, plate_scale, 5);
}
}
return 0;
}