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Tool for extracting local image features.
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/**
 * Copyright (c) 2011, The University of Southampton and the individual contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *   * 	Redistributions of source code must retain the above copyright notice,
 * 	this list of conditions and the following disclaimer.
 *
 *   *	Redistributions in binary form must reproduce the above copyright notice,
 * 	this list of conditions and the following disclaimer in the documentation
 * 	and/or other materials provided with the distribution.
 *
 *   *	Neither the name of the University of Southampton nor the names of its
 * 	contributors may be used to endorse or promote products derived from this
 * 	software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.openimaj.tools.localfeature.options;

import org.kohsuke.args4j.CmdLineOptionsProvider;
import org.kohsuke.args4j.Option;
import org.openimaj.image.FImage;
import org.openimaj.image.Image;
import org.openimaj.image.processing.resize.ResizeProcessor;
import org.openimaj.image.processor.SinglebandImageProcessor;

/**
 * Image pre-processing options
 * 
 * @author Jonathon Hare ([email protected])
 */
enum ImageTransform implements CmdLineOptionsProvider {
	/**
	 * Do nothing
	 */
	NOTHING {
		@Override
		public ImageTransformOp getOptions() {
			return new NothingOp();
		}
	},
	/**
	 * Resize the image so the longest dimension matches the given size (only
	 * scales down).
	 */
	RESIZE_MAX {
		@Override
		public ImageTransformOp getOptions() {
			return new ResizeMaxOp();
		}
	};

	@Override
	public abstract ImageTransformOp getOptions();

	/**
	 * Pre-processing transform
	 * 
	 * @author Jonathon Hare ([email protected])
	 */
	public static abstract class ImageTransformOp {
		/**
		 * Apply the transform
		 * 
		 * @param a
		 *            the input image
		 * @return the transformed image
		 */
		public abstract Image transform(Image a);
	}

	private static class NothingOp extends ImageTransformOp {
		@Override
		public Image transform(Image a) {
			return a;
		}
	}

	private static class ResizeMaxOp extends ImageTransformOp {
		@Option(
				name = "--dim-max",
				aliases = "-dmax",
				required = false,
				usage = "The resultant length of maximum dimention")
		private int dmax = 640;

		@SuppressWarnings("unchecked")
		@Override
		public Image transform(Image a) {
			if (!(a instanceof SinglebandImageProcessor.Processable))
				throw new RuntimeException("Can't resize that kind of image");

			final int aw = a.getWidth();
			final int ah = a.getHeight();
			int newwidth, newheight;
			if (aw < ah) {
				// Final height will be dmax
				newheight = dmax;
				final float resizeRatio = ((float) dmax / (float) ah);
				newwidth = (int) (aw * resizeRatio);
			}
			else {
				// Final width will be dmax,
				newwidth = dmax;
				final float resizeRatio = ((float) dmax / (float) aw);
				newheight = (int) (ah * resizeRatio);
			}

			System.out.println("Resizing image to: " + newwidth + "x" + newheight);
			return ((SinglebandImageProcessor.Processable) a).process(new ResizeProcessor(
					newwidth, newheight));
		}
	}
}