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BoofCV is an open source Java library for real-time computer vision and robotics applications.

There is a newer version: 1.1.7

/*
 * Copyright (c) 2011-2017, 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.struct.Configuration;

/**
 * Abstract base class for SURF implementations.  Use child classes to specify a specific implementation.
 *
 * @see boofcv.alg.feature.describe.DescribePointSurf
 *
 * @author Peter Abeles
 */
public abstract class ConfigSurfDescribe implements Configuration {
	/**
	 * Number of sub-regions wide the large grid is. Typically 4
	 */
	public int widthLargeGrid = 4;
	/**
	 * Number of sample points wide a sub-region is. Typically 5
	 */
	public int widthSubRegion = 5;
	/**
	 * The width of a sample point. Typically 3
	 */
	public int widthSample = 3;
	/**
	 * If true the Haar wavelet will be used.  If false means image gradient.
	 */
	public boolean useHaar = false;

	/**
	 * Configuration for SURF implementation that has been designed for speed at the cost of some
	 * stability..
	 *
	 * @see boofcv.alg.feature.describe.DescribePointSurf
	 */
	public static class Speed extends ConfigSurfDescribe {
		/**
		 * Weighting factor's sigma.  Try 3.8
		 */
		public double weightSigma = 4.5;
	}

	/**
	 * Configuration for SURF implementation that has been designed for stability.
	 *
	 * @see boofcv.alg.feature.describe.DescribePointSurfMod
	 */
	public static class Stability extends ConfigSurfDescribe {
		/**
		 * Number of sample points sub-regions overlap, Typically 2.
		 */
		public int overLap = 2;
		/**
		 * Sigma used to weight points in the sub-region grid. Typically 2.5
		 */
		public double sigmaLargeGrid = 2.5;
		/**
		 * Sigma used to weight points in the large grid. Typically 2.5
		 */
		public double sigmaSubRegion = 2.5;
	}

	@Override
	public void checkValidity() {
	}

	public static void main(String[] args) throws ClassNotFoundException {
		Class c = Class.forName("boofcv.abst.feature.describe.ConfigSurfDescribe$Speed");
		System.out.println("c = "+c);
		Configuration a;
	}
}