// Assumes that the points are ordered going around the quadrilateral
private static double areaOfQuad(List<Point2D_F64> quad) {
double area1 =
boofcv.alg.feature.detect.quadblob.FindBoundingQuadrilateral.area(
quad.get(0), quad.get(2), quad.get(1));
double area2 =
boofcv.alg.feature.detect.quadblob.FindBoundingQuadrilateral.area(
quad.get(0), quad.get(2), quad.get(3));
return area1 + area2;
}
public static boolean isCardShaped(List<Point2D_I32> contour) {
// turn it into a quad
List<Point2D_F64> f64Contour = new ArrayList<Point2D_F64>();
for (Point2D_I32 point : contour) {
f64Contour.add(new Point2D_F64(point.x, point.y));
}
List<Point2D_F64> quad;
try {
quad = boofcv.alg.feature.detect.quadblob.FindBoundingQuadrilateral.findCorners(f64Contour);
} catch (Exception e) {
System.out.println("finding corners of bounding quadrilateral failed");
return false;
}
Double ratio = aspectRatio(quad);
if (ratio == null) {
return false;
}
if (Math.min(ratio, TARGET_ASPECT_RATIO) / Math.max(ratio, TARGET_ASPECT_RATIO)
< ASPECT_RATIO_TOLERANCE) {
return true;
}
return false;
}
public static int areaOfRegion(List<Point2D_F64> list) {
List<Point2D_F64> quad;
try {
quad = boofcv.alg.feature.detect.quadblob.FindBoundingQuadrilateral.findCorners(list);
} catch (Exception e) {
System.out.println("finding corners of bounding quadrilateral failed");
return -1;
}
double triangleArea0 =
boofcv.alg.feature.detect.quadblob.FindBoundingQuadrilateral.area(
quad.get(0), quad.get(1), quad.get(2));
double triangleArea1 =
boofcv.alg.feature.detect.quadblob.FindBoundingQuadrilateral.area(
quad.get(0), quad.get(3), quad.get(2));
return (int) Math.round(triangleArea1 + triangleArea0);
}
// 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;
}