/**
* Computes the mean squared error (MSE) between the two images.
*
* @param imgA first image. Not modified.
* @param imgB second image. Not modified.
* @return error between the two images.
*/
public static double computeMeanSquaredError(ImageSInt32 imgA, ImageSInt32 imgB) {
final int h = imgA.getHeight();
final int w = imgA.getWidth();
double total = 0;
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
double difference = imgA.get(x, y) - imgB.get(x, y);
total += difference * difference;
}
}
return total / (w * h);
}
// convert a blob image into quadrilaterals bounding each of the blobs
public static List<List<Point2D_F64>> quadsFromBlobs(ImageSInt32 blobImage, int numBlobs) {
@SuppressWarnings("unchecked")
List<List<Point2D_F64>> points = new ArrayList();
for (int i = 1; i < numBlobs; i++) {
// TODO: make fast
ArrayList<Point2D_F64> inClass = new ArrayList<Point2D_F64>();
for (int x = 0; x < blobImage.getWidth(); x++) {
for (int y = 0; y < blobImage.getHeight(); y++) {
if (blobImage.get(x, y) == i) {
inClass.add(new Point2D_F64(x, y));
}
}
}
// Transform blobs into quadrilaterals, ignoring blobs of very small size
if (inClass.size() > BLOB_SIZE_THRESHOLD) {
points.add(
boofcv.alg.feature.detect.quadblob.FindBoundingQuadrilateral.findCorners(inClass));
}
}
return points;
}