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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) 2011-2018, 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.geo.robust;

import boofcv.alg.geo.DistanceFromModelMultiView;
import boofcv.alg.geo.NormalizedToPixelError;
import boofcv.struct.calib.CameraPinhole;
import boofcv.struct.geo.AssociatedPair;
import georegression.struct.homography.Homography2D_F64;
import georegression.struct.point.Point2D_F64;
import georegression.transform.homography.HomographyPointOps_F64;

import java.util.List;


/**
 * 
 * Computes the Euclidean error squared between 'p1' and 'p2' after projecting 'p1' into image 2.  Input
 * points must be in normalized image coordinates, but the output error will be in pixel coordinates.
 * 
 * 
 * @author Peter Abeles
 */
public class DistanceHomographyCalibratedSq implements DistanceFromModelMultiView
{
	Homography2D_F64 model;
	private Point2D_F64 expected = new Point2D_F64();
	private NormalizedToPixelError errorCam2 = new NormalizedToPixelError();

	@Override
	public void setModel(Homography2D_F64 model ) {
		this.model = model;
	}

	@Override
	public double computeDistance(AssociatedPair pt) {
		HomographyPointOps_F64.transform(model, pt.p1, expected);

		return errorCam2.errorSq(expected,pt.p2);
	}

	@Override
	public void computeDistance(List points, double[] distance) {
		for( int i = 0; i < points.size(); i++ ) {
			AssociatedPair p = points.get(i);
			HomographyPointOps_F64.transform(model, p.p1, expected);

			distance[i] = errorCam2.errorSq(expected,p.p2);
		}
	}

	@Override
	public Class getPointType() {
		return AssociatedPair.class;
	}

	@Override
	public Class getModelType() {
		return Homography2D_F64.class;
	}

	@Override
	public void setIntrinsic( int view , CameraPinhole intrinsic) {
		if( view == 1 )
			errorCam2.set(intrinsic.fx,intrinsic.fy, intrinsic.skew);
		else if( view != 0)
			throw new IllegalArgumentException("View must be 0 or 1");
	}

	@Override
	public int getNumberOfViews() {
		return 2;
	}
}