/**
* Loads the Interestpoints from file.
*
* @param fileName the file name
* @return the list
*/
public static List<InterestPoint> loadFromFile(String fileName) {
try {
Scanner in = new Scanner(new File(fileName));
int iptsSize = in.nextInt();
List ipts = new ArrayList(iptsSize);
for (int i = 0; i < iptsSize; i++) {
float x = in.nextFloat();
float y = in.nextFloat();
float strength = in.nextFloat();
float trace = in.nextFloat();
float scale = in.nextFloat();
float ori = in.nextFloat();
int descSize = in.nextInt();
InterestPoint ipt = new InterestPoint(x, y, strength, trace, scale);
ipt.orientation = ori;
if (descSize > 0) {
ipt.descriptor = new float[descSize];
for (int j = 0; j < descSize; j++) ipt.descriptor[j] = in.nextFloat();
}
ipts.add(ipt);
}
in.close();
return ipts;
} catch (FileNotFoundException e) {
}
return null;
}
/**
* Find mathes.
*
* @param ipts1 the ipts1
* @param ipts2 the ipts2
* @return the map
*/
public static Map<InterestPoint, InterestPoint> findMathes(
List<InterestPoint> ipts1, List<InterestPoint> ipts2) {
Map<InterestPoint, InterestPoint> res = new HashMap<InterestPoint, InterestPoint>();
int descSize = 64;
for (InterestPoint p1 : ipts1) {
float secondBest;
float bestDistance = secondBest = 3.4028235E+38F;
InterestPoint bestMatch = null;
for (InterestPoint p2 : ipts2) {
if (p1.sign != p2.sign) {
continue;
}
float distance = 0.0F;
float[] v1 = p1.descriptor;
float[] v2 = p2.descriptor;
float delta;
int i = 0;
while (i < v1.length && i < v2.length) {
delta = v1[i] - v2[i];
distance += delta * delta;
if (distance >= secondBest) break;
i++;
if (i < descSize) {
continue;
}
if (distance < bestDistance) {
secondBest = bestDistance;
bestDistance = distance;
bestMatch = p2;
} else {
secondBest = distance;
}
}
}
if (bestDistance >= 0.5F * secondBest) {
continue;
}
res.put(p1, bestMatch);
bestMatch.dx = (bestMatch.xpos - p1.xpos);
bestMatch.dy = (bestMatch.ypos - p1.ypos);
}
return res;
}
/**
* Save to Interesting points to a file. This will help us in reducing the computation time while
* comparing images.
*
* @param ipts the ipts
* @param fileName the file name
* @param inclDescriptor the incl descriptor
*/
public static void saveToFile(List<InterestPoint> ipts, String fileName, boolean inclDescriptor) {
try {
PrintWriter out = new PrintWriter(fileName);
if ((ipts != null) && (ipts.size() > 0)) {
for (InterestPoint ipt : ipts) {
if (inclDescriptor) {
out.println(ipt);
} else {
float[] temp = ipt.descriptor;
ipt.descriptor = null;
out.println(ipt);
ipt.descriptor = temp;
}
}
}
out.close();
} catch (FileNotFoundException e) {
}
}
