public void checkBorder(ImageFloat32 image, int c_x, int c_y, int w, int h) {
ImplDescribePointPixelRegionNCC_F32 alg = new ImplDescribePointPixelRegionNCC_F32(w, h);
NccFeature desc = new NccFeature(alg.getDescriptorLength());
alg.setImage(image);
assertFalse(alg.isInBounds(c_x, c_y));
}
public void checkInner(ImageFloat32 image, int c_x, int c_y, int w, int h) {
ImplDescribePointPixelRegionNCC_F32 alg = new ImplDescribePointPixelRegionNCC_F32(w, h);
NccFeature desc = new NccFeature(alg.getDescriptorLength());
alg.setImage(image);
assertTrue(alg.isInBounds(c_x, c_y));
alg.process(c_x, c_y, desc);
int y0 = c_y - h / 2;
int x0 = c_x - w / 2;
double mean = 0;
for (int y = y0; y < y0 + h; y++) {
for (int x = x0; x < x0 + w; x++) {
mean += image.get(x, y);
}
}
mean /= w * h;
double variance = 0;
for (int y = y0; y < y0 + h; y++) {
for (int x = x0; x < x0 + w; x++) {
double a = image.get(x, y) - mean;
variance += a * a;
}
}
variance /= w * h;
assertEquals(desc.mean, mean, 1e-8);
assertEquals(desc.sigma, Math.sqrt(variance), 1e-8);
int index = 0;
for (int y = y0; y < y0 + h; y++) {
for (int x = x0; x < x0 + w; x++, index++) {
assertEquals(image.get(x, y) - mean, desc.value[index], 1e-4);
}
}
}
