opencv_test.pde

//
// sample sketch for "OpenCV for Processing" library...
//
import gab.opencv.*;
import org.opencv.core.*;
import org.opencv.imgproc.*;

String image_url = "http://example.com/path/to/movie.jpg";
OpenCV opencv;
Mat test_img;

Mat loadImageMat(String url) {
  opencv.loadImage(url);
  Mat bgra_mat = opencv.getColor();  // BGRA
  return bgra_mat;
  
//  Mat bgr_mat = new Mat(bgra_mat.cols(), bgra_mat.rows(), CvType.CV_8UC3);
//  Imgproc.cvtColor(bgra_mat, bgr_mat, Imgproc.COLOR_BGRA2BGR);
//  return bgr_mat; 
}

PImage convertToPImage(Mat src) {
  PImage pimage = createImage(src.cols(), src.rows(), ARGB);
  
  if (src.channels() == 1) {
    Mat bgra_mat = new Mat(src.cols(), src.rows(), CvType.CV_8UC4);
    Imgproc.cvtColor(src, bgra_mat, Imgproc.COLOR_GRAY2BGRA);
    opencv.toPImage(bgra_mat, pimage);
  }
  else if (src.channels() == 3) {
    Mat bgra_mat = new Mat(src.cols(), src.rows(), CvType.CV_8UC4);
    Imgproc.cvtColor(src, bgra_mat, Imgproc.COLOR_BGR2BGRA);
    opencv.toPImage(bgra_mat, pimage);
  }
  else {
    opencv.toPImage(src, pimage);
  }
  return pimage;
}

void setup() {
  size(640, 480);
  opencv = new OpenCV(this, width, height);
}

void draw() {
  tint(#aaeeff, 40);

  Mat img = loadImageMat(image_url);
  PImage pimage = convertToPImage(img);
  image(pimage, 0, 0);
  
  if (frameCount % 30 == 0) {
    println("fps=" + frameRate);
  }
}