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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) 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.io.image;

import boofcv.misc.LookUpImages;
import boofcv.struct.image.GrayU8;
import boofcv.struct.image.ImageBase;
import boofcv.struct.image.ImageDimension;
import lombok.Getter;
import lombok.Setter;

import java.util.List;

import static boofcv.misc.BoofMiscOps.checkEq;

/**
 * Implementation of {@link LookUpImages} that converts the name into an integer. The integer represents the index
 * of the image in the list of paths provided. It's assumed that all images have the same shape and the first image
 * is loaded to get the shape.
 *
 * @author Peter Abeles
 */
public class LookUpImageFilesByIndex implements LookUpImages {
	@Getter final List paths;
	final ImageDimension dimension = new ImageDimension(-1,-1);
	@Getter @Setter LoadImage loader;

	public LookUpImageFilesByIndex( List paths ) {
		this(paths, (path,output)-> UtilImageIO.loadImage(path, true, output));
	}
	public LookUpImageFilesByIndex( List paths , LoadImage loader) {
		this.paths = paths;
		this.loader = loader;
	}

	@Override public boolean loadShape( String name, ImageDimension shape ) {
		int index = Integer.parseInt(name);
		if (index < 0 || index >= paths.size())
			return false;

		if (dimension.height==-1) {
			var gray = new GrayU8(1, 1);
			loader.load(paths.get(0), gray);
			dimension.width = gray.getWidth();
			dimension.height = gray.getHeight();
		}

		shape.setTo(dimension);
		return true;
	}

	@Override public > boolean loadImage( String name, LT output ) {
		int index = Integer.parseInt(name);
		if (index < 0 || index >= paths.size())
			return false;

		loader.load(paths.get(index), output);

		// Validate the assumption that all images are the same size. if this is false then loadShape() is giving
		// incorrect results
		if (dimension.width==-1) {
			dimension.setTo(output.width, output.height);
		} else {
			checkEq(dimension.width, output.width);
			checkEq(dimension.height, output.height);
		}
		return true;
	}

	@FunctionalInterface
	public interface LoadImage {
		void load( String path, ImageBase output);
	}
}