Hi all,
I am having a problem with line segment detection. I am using openCV 3. The output file sometimes has lines in the wrong places and sometimes is blank depending on the input image. I think its something to do with my variable called lines. I have tried to implement this from [this example.](http://docs.opencv.org/3.0-rc1/d8/dd4/lsd_lines_8cpp-example.html#_a1) The problem is I dont know c++ at all so it has been hard to understand. I am doing a project on emotion detection from an image. Am i on the right track with this?
Any help appreciated.
public void lineSegment(File file) {
new Event().fireEvent(new EventItem(
this, 1, "Begining line segmentation . . . \n"));
new Event().fireEvent(new EventItem(
this, 1, "File path:\n" + file.getAbsolutePath() + "\n"));
Mat image = Imgcodecs.imread(file.getAbsolutePath());
try {
Imgproc.Canny(image,image,50,200);
LineSegmentDetector ls = Imgproc.createLineSegmentDetector();
double start = Core.getTickCount();
Mat lines = new Mat();
ls.detect(image, lines);
double duration_ms = (Core.getTickCount() - start) * 1000 / Core.getTickFrequency();
Mat lineImage = Imgcodecs.imread(
"/Users/DarrylThorne/IdeaProjects/Face Detection Project/pics/blank.jpg");
ls.drawSegments(lineImage, lines);
Imgcodecs.imwrite("lineSegImage.jpg", lineImage);
new Event().fireEvent(new EventItem(this, 1, "Time taken: " + duration_ms + "ms.\n"));
} catch (CvException e) {
e.printStackTrace();
}
}
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