boofcv.gui.feature.VisualizeOpticalFlow Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of visualize Show documentation
BoofCV is an open source Java library for real-time computer vision and robotics applications.
The newest version!
/*
 * 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.gui.feature;

import boofcv.alg.misc.PixelMath;
import boofcv.io.image.ConvertBufferedImage;
import boofcv.struct.flow.ImageFlow;
import boofcv.struct.image.GrayF32;

import java.awt.image.BufferedImage;

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

	public static void colorizeDirection(ImageFlow flowImage, BufferedImage out) {

		int tableSine[] = new int[360];
		int tableCosine[] = new int[360];

		for( int i = 0; i < 360; i++ ) {
			double angle = i*Math.PI/180.0;
			tableSine[i] = (int)(255*(Math.sin(angle)+1)/2);
			tableCosine[i] = (int)(255*(Math.cos(angle)+1)/2);
		}

		for( int y = 0; y < flowImage.height; y++ ) {
			for( int x = 0; x < flowImage.width; x++ ) {
				ImageFlow.D f = flowImage.unsafe_get(x,y);

				if( !f.isValid() ) {
					out.setRGB(x,y,0xFF);
				} else {
					double angle = Math.atan2(f.y,f.x);
					int degree = (int)(180+angle*179.999/Math.PI);
					int r = tableSine[degree];
					int g = tableCosine[degree];

					out.setRGB(x,y,r<<16 | g<<8);
				}
			}
		}
	}

	public static void magnitudeAbs(ImageFlow flowImage, BufferedImage out) {

		GrayF32 magnitude = new GrayF32(flowImage.width,flowImage.height);

		float max = 0;

		for( int y = 0; y < flowImage.height; y++ ) {
			for( int x = 0; x < flowImage.width; x++ ) {
				ImageFlow.D f = flowImage.unsafe_get(x,y);

				if( !f.isValid() ) {
					out.setRGB(x,y,0xFF);
				} else {
					float m = Math.max(Math.abs(f.x),Math.abs(f.y));
					if( m > max )
						max = m;
					magnitude.unsafe_set(x, y, m);
				}
			}
		}

		PixelMath.multiply(magnitude, 255 / max, magnitude);

		ConvertBufferedImage.convertTo(magnitude,out);
	}

	public static void magnitudeAbs(ImageFlow flowImage, float maxValue,  BufferedImage out) {

		GrayF32 magnitude = new GrayF32(flowImage.width,flowImage.height);


		for( int y = 0; y < flowImage.height; y++ ) {
			for( int x = 0; x < flowImage.width; x++ ) {
				ImageFlow.D f = flowImage.unsafe_get(x,y);

				if( !f.isValid() ) {
					out.setRGB(x,y,0xFF);
				} else {
					float m = Math.max(Math.abs(f.x),Math.abs(f.y));
					magnitude.unsafe_set(x, y, m);
				}
			}
		}

		PixelMath.multiply(magnitude, 255 / maxValue, magnitude);
		PixelMath.boundImage(magnitude,0,255);

		ConvertBufferedImage.convertTo(magnitude,out);
	}

	public static void colorized(ImageFlow flowImage, float maxValue,  BufferedImage out) {

		int tableSine[] = new int[360];
		int tableCosine[] = new int[360];

		for( int i = 0; i < 360; i++ ) {
			double angle = i*Math.PI/180.0;
			tableSine[i] = (int)(255*(Math.sin(angle)+1)/2);
			tableCosine[i] = (int)(255*(Math.cos(angle)+1)/2);
		}

		for( int y = 0; y < flowImage.height; y++ ) {
			for( int x = 0; x < flowImage.width; x++ ) {
				ImageFlow.D f = flowImage.unsafe_get(x,y);

				if( !f.isValid() ) {
					out.setRGB(x,y,0x55);
				} else {
					float m = Math.max(Math.abs(f.x),Math.abs(f.y))/maxValue;

					if( m > 1 )m = 1;

					double angle = Math.atan2(f.y,f.x);
					int degree = (int)(180+angle*179.999/Math.PI);
					int r = (int)(m*tableSine[degree]);
					int g = (int)(m*tableCosine[degree]);

					out.setRGB(x, y, r << 16 | g << 8);
				}
			}
		}
	}
}