boofcv.alg.feature.detect.edge.GGradientToEdgeFeatures Maven / Gradle / Ivy

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/*
 * Copyright (c) 2021, 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.feature.detect.edge;

import boofcv.struct.image.GrayF32;
import boofcv.struct.image.GrayS16;
import boofcv.struct.image.GrayS32;
import boofcv.struct.image.ImageGray;

/**
 * Image type agnostic version of {@link GradientToEdgeFeatures}.
 *
 * @author Peter Abeles
 */
public class GGradientToEdgeFeatures {

	/**
	 * Computes the edge intensity using a Euclidean norm.
	 *
	 * @param derivX Derivative along x-axis. Not modified.
	 * @param derivY Derivative along y-axis. Not modified.
	 * @param intensity Edge intensity.
	 */
	static public >
	void intensityE( D derivX, D derivY, GrayF32 intensity ) {
		if (derivX instanceof GrayF32) {
			GradientToEdgeFeatures.intensityE((GrayF32)derivX, (GrayF32)derivY, intensity);
		} else if (derivX instanceof GrayS16) {
			GradientToEdgeFeatures.intensityE((GrayS16)derivX, (GrayS16)derivY, intensity);
		} else if (derivX instanceof GrayS32) {
			GradientToEdgeFeatures.intensityE((GrayS32)derivX, (GrayS32)derivY, intensity);
		} else {
			throw new IllegalArgumentException("Unknown input type");
		}
	}

	/**
	 * Computes the edge intensity using a Euclidean norm.
	 *
	 * @param derivX Derivative along x-axis. Not modified.
	 * @param derivY Derivative along y-axis. Not modified.
	 * @param intensity Edge intensity.
	 */
	static public >
	void intensityAbs( D derivX, D derivY, GrayF32 intensity ) {
		if (derivX instanceof GrayF32) {
			GradientToEdgeFeatures.intensityAbs((GrayF32)derivX, (GrayF32)derivY, intensity);
		} else if (derivX instanceof GrayS16) {
			GradientToEdgeFeatures.intensityAbs((GrayS16)derivX, (GrayS16)derivY, intensity);
		} else if (derivX instanceof GrayS32) {
			GradientToEdgeFeatures.intensityAbs((GrayS32)derivX, (GrayS32)derivY, intensity);
		} else {
			throw new IllegalArgumentException("Unknown input type");
		}
	}

	/**
	 * Computes the edge orientation using the {@link Math#atan} function.
	 *
	 * @param derivX Derivative along x-axis. Not modified.
	 * @param derivY Derivative along y-axis. Not modified.
	 * @param angle Edge orientation in radians (-pi/2 to pi/2).
	 */
	static public >
	void direction( D derivX, D derivY, GrayF32 angle ) {
		if (derivX instanceof GrayF32) {
			GradientToEdgeFeatures.direction((GrayF32)derivX, (GrayF32)derivY, angle);
		} else if (derivX instanceof GrayS16) {
			GradientToEdgeFeatures.direction((GrayS16)derivX, (GrayS16)derivY, angle);
		} else if (derivX instanceof GrayS32) {
			GradientToEdgeFeatures.direction((GrayS32)derivX, (GrayS32)derivY, angle);
		} else {
			throw new IllegalArgumentException("Unknown input type");
		}
	}

	/**
	 * Computes the edge orientation using the {@link Math#atan2} function.
	 *
	 * @param derivX Derivative along x-axis. Not modified.
	 * @param derivY Derivative along y-axis. Not modified.
	 * @param angle Edge orientation in radians (-pi to pi).
	 */
	static public >
	void direction2( D derivX, D derivY, GrayF32 angle ) {
		if (derivX instanceof GrayF32) {
			GradientToEdgeFeatures.direction2((GrayF32)derivX, (GrayF32)derivY, angle);
		} else if (derivX instanceof GrayS16) {
			GradientToEdgeFeatures.direction2((GrayS16)derivX, (GrayS16)derivY, angle);
		} else if (derivX instanceof GrayS32) {
			GradientToEdgeFeatures.direction2((GrayS32)derivX, (GrayS32)derivY, angle);
		} else {
			throw new IllegalArgumentException("Unknown input type");
		}
	}

	/**
	 * 
	 * Sets edge intensities to zero if the pixel has an intensity which is less than any of
	 * the two adjacent pixels. Pixel adjacency is determined based upon the sign of the image gradient. Less precise
	 * than other methods, but faster.
	 * 
	 *
	 * @param intensity Edge intensities. Not modified.
	 * @param derivX Image derivative along x-axis.
	 * @param derivY Image derivative along y-axis.
	 * @param output Filtered intensity. Modified.
	 */
	static public >
	void nonMaxSuppressionCrude4( GrayF32 intensity, D derivX, D derivY, GrayF32 output ) {
		if (derivX instanceof GrayF32) {
			GradientToEdgeFeatures.nonMaxSuppressionCrude4(intensity, (GrayF32)derivX, (GrayF32)derivY, output);
		} else if (derivX instanceof GrayS16) {
			GradientToEdgeFeatures.nonMaxSuppressionCrude4(intensity, (GrayS16)derivX, (GrayS16)derivY, output);
		} else if (derivX instanceof GrayS32) {
			GradientToEdgeFeatures.nonMaxSuppressionCrude4(intensity, (GrayS32)derivX, (GrayS32)derivY, output);
		} else {
			throw new IllegalArgumentException("Unknown input type");
		}
	}
}