TestDescribeRegionPoint_SIFT.java

/*
 * Copyright (c) 2011-2016, Peter Abeles. All Rights Reserved.
 *
 * This file is part of BoofCV (http://boofcv.org).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package boofcv.abst.feature.describe;

import boofcv.alg.feature.describe.DescribePointSift;
import boofcv.alg.feature.detect.interest.SiftScaleSpace;
import boofcv.alg.misc.GImageMiscOps;
import boofcv.factory.feature.describe.FactoryDescribePointAlgs;
import boofcv.struct.feature.TupleDesc_F64;
import boofcv.struct.image.GrayF32;
import org.junit.Test;

import java.util.Random;

import static junit.framework.TestCase.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;

/**
 * @author Peter Abeles
 */
public class TestDescribeRegionPoint_SIFT {

	Random rand = new Random(234);

	@Test
	public void flags() {
		DescribeRegionPoint_SIFT<GrayF32> alg = declare();

		assertTrue(alg.requiresOrientation());
		assertTrue(alg.requiresRadius());

		TupleDesc_F64 desc = alg.createDescription();
		assertEquals(128,desc.size());

		assertEquals(2*alg.describe.getCanonicalRadius(),alg.getCanonicalWidth(),1e-8);
	}

	@Test
	public void process() {

		GrayF32 image = new GrayF32(640,480);
		GImageMiscOps.fillUniform(image,rand,0,200);

		DescribeRegionPoint_SIFT<GrayF32> alg = declare();
		alg.setImage(image);

		TupleDesc_F64 desc0 = alg.createDescription();
		TupleDesc_F64 desc1 = alg.createDescription();
		TupleDesc_F64 desc2 = alg.createDescription();

		// same location, but different orientations and scales
		assertTrue(alg.process(100,120,0.5,10,desc0));
		assertTrue(alg.process(100,50,-1.1,10,desc1));
		assertTrue(alg.process(100,50,0.5,7,desc2));

		// should be 3 different descriptions
		assertNotEquals(desc0.getDouble(0),desc1.getDouble(0),1e-6);
		assertNotEquals(desc0.getDouble(0),desc2.getDouble(0),1e-6);
		assertNotEquals(desc1.getDouble(0),desc2.getDouble(0),1e-6);

		// see if it blows up along the image border
		assertTrue(alg.process(0,120,0.5,10,desc0));
		assertTrue(alg.process(100,0,0.5,10,desc0));
		assertTrue(alg.process(639,120,0.5,10,desc0));
		assertTrue(alg.process(100,479,0.5,10,desc0));
	}

	private DescribeRegionPoint_SIFT<GrayF32> declare() {

		SiftScaleSpace ss = new SiftScaleSpace(0,4,3,1.6);
		DescribePointSift<GrayF32> desc = FactoryDescribePointAlgs.sift(null,GrayF32.class);

		return new DescribeRegionPoint_SIFT<>(ss,desc,GrayF32.class);
	}
}