TestLikelihoodHistCoupled_SB_U8.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.alg.tracker.meanshift;

import boofcv.struct.image.GrayU8;
import georegression.struct.shapes.RectangleLength2D_I32;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

/**
 * @author Peter Abeles
 */
public class TestLikelihoodHistCoupled_SB_U8 {

	@Test
	public void singleColor() {
		LikelihoodHistCoupled_SB_U8 alg = new LikelihoodHistCoupled_SB_U8(255,11);

		GrayU8 image = new GrayU8(30,40);

		RectangleLength2D_I32 r = new RectangleLength2D_I32(3,4,12,8);
		setColor(image, r, 100);

		alg.setImage(image);
		alg.createModel(r);

		assertEquals(1.0f,alg.compute(3,4),1e-4);
		assertEquals(1.0f,alg.compute(14,11),1e-4);
		assertEquals(0, alg.compute(10, 30), 1e-4);

	}

	@Test
	public void multipleColors() {
		LikelihoodHistCoupled_SB_U8 alg = new LikelihoodHistCoupled_SB_U8(255,11);

		GrayU8 image = new GrayU8(30,40);

		RectangleLength2D_I32 r0 = new RectangleLength2D_I32(3,4,8,8);
		RectangleLength2D_I32 r1 = new RectangleLength2D_I32(11,4,4,8);
		setColor(image,r0,100);
		setColor(image,r1,50);


		RectangleLength2D_I32 region = new RectangleLength2D_I32(3,4,12,8);
		alg.setImage(image);
		alg.createModel(region);


		float v0 = alg.compute(3,4);
		float v1 = alg.compute(11,4);

		assertEquals(1.0f,v0+v1,1e-4);
		assertTrue(v0>v1);
	}

	public static void setColor(GrayU8 image , RectangleLength2D_I32 rect , int value ) {

		for( int y = 0; y < rect.height; y++ ) {
			for( int x = 0; x < rect.width; x++ ) {
				image.set(x+rect.x0,y+rect.y0,value);
			}
		}
	}
}