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import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
import org.opencv.core.Core;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.Scalar;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.photo.CalibrateDebevec;
import org.opencv.photo.MergeDebevec;
import org.opencv.photo.MergeMertens;
import org.opencv.photo.Photo;
import org.opencv.photo.Tonemap;
class HDRImaging {
public void loadExposureSeq(String path, List<Mat> images, List<Float> times) {
path += "/";
List<String> lines;
try {
lines = Files.readAllLines(Paths.get(path + "list.txt"));
for (String line : lines) {
String[] splitStr = line.split("\\s+");
if (splitStr.length == 2) {
String name = splitStr[0];
Mat img = Imgcodecs.imread(path + name);
images.add(img);
float val = Float.parseFloat(splitStr[1]);
times.add(1/ val);
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
public void run(String[] args) {
String path = args.length > 0 ? args[0] : "";
if (path.isEmpty()) {
System.out.println("Path is empty. Use the directory that contains images and exposure times.");
System.exit(0);
}
//! [Load images and exposure times]
List<Mat> images = new ArrayList<>();
List<Float> times = new ArrayList<>();
loadExposureSeq(path, images, times);
//! [Load images and exposure times]
//! [Estimate camera response]
Mat response = new Mat();
CalibrateDebevec calibrate = Photo.createCalibrateDebevec();
Mat matTimes = new Mat(times.size(), 1, CvType.CV_32F);
float[] arrayTimes = new float[(int) (matTimes.total()*matTimes.channels())];
for (int i = 0; i < times.size(); i++) {
arrayTimes[i] = times.get(i);
}
matTimes.put(0, 0, arrayTimes);
calibrate.process(images, response, matTimes);
//! [Estimate camera response]
//! [Make HDR image]
Mat hdr = new Mat();
MergeDebevec mergeDebevec = Photo.createMergeDebevec();
mergeDebevec.process(images, hdr, matTimes);
//! [Make HDR image]
//! [Tonemap HDR image]
Mat ldr = new Mat();
Tonemap tonemap = Photo.createTonemap(2.2f);
tonemap.process(hdr, ldr);
//! [Tonemap HDR image]
//! [Perform exposure fusion]
Mat fusion = new Mat();
MergeMertens mergeMertens = Photo.createMergeMertens();
mergeMertens.process(images, fusion);
//! [Perform exposure fusion]
//! [Write results]
Core.multiply(fusion, new Scalar(255,255,255), fusion);
Core.multiply(ldr, new Scalar(255,255,255), ldr);
Imgcodecs.imwrite("fusion.png", fusion);
Imgcodecs.imwrite("ldr.png", ldr);
Imgcodecs.imwrite("hdr.hdr", hdr);
//! [Write results]
System.exit(0);
}
}
public class HDRImagingDemo {
public static void main(String[] args) {
// Load the native OpenCV library
System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
new HDRImaging().run(args);
}
}
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