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BoofCV is an open source Java library for real-time computer vision and robotics applications.

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/*
 * Copyright (c) 2011-2014, 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.struct.pyramid;

import boofcv.core.image.ImageGenerator;
import boofcv.core.image.inst.FactoryImageGenerator;
import boofcv.struct.image.ImageSingleBand;

/**
 * 

* Base class for image pyramids. Provides common functionality and data structures. The scale * is defined in its children {@link PyramidDiscrete} and {@link PyramidFloat}. This allows * it to be either integer or floating point and strongly typed. *

* *

* When updating the pyramid, if the top most layer is at the same resolution as the original image then a reference * can optionally be saved, avoiding an unnecessary image copy. This is done by setting the saveOriginalReference * to true. *

* * @author Peter Abeles */ @SuppressWarnings({"unchecked"}) public abstract class ImagePyramidBase implements ImagePyramid { // shape of full resolution input image protected int bottomWidth; protected int bottomHeight; // The image at different resolutions. Larger indexes for lower resolutions public T layers[]; // if the top layer is full resolution, should a copy be made or a reference to the original be saved?i protected boolean saveOriginalReference; // creates new images protected ImageGenerator generator; /** * Specifies input image size and behavior of top most layer. * * @param imageType Type of image which is processed * @param saveOriginalReference If a reference to the full resolution image should be saved instead of copied. */ public ImagePyramidBase( Class imageType , boolean saveOriginalReference ) { this.generator = FactoryImageGenerator.create(imageType); this.saveOriginalReference = saveOriginalReference; } /** * Initializes internal data structures based on the input image's size. Should be called each time a new image * is processed. * @param width Image width * @param height Image height */ @Override public void initialize(int width, int height) { // see if it has already been initialized if( bottomWidth == width && bottomHeight == height ) return; this.bottomWidth = width; this.bottomHeight = height; layers = generator.createArray(getNumLayers()); double scaleFactor = getScale(0); if (scaleFactor == 1) { if (!saveOriginalReference) { layers[0] = generator.createInstance(bottomWidth, bottomHeight); } } else { layers[0] = generator.createInstance((int)Math.ceil(bottomWidth / scaleFactor), (int)Math.ceil(bottomHeight / scaleFactor)); } for (int i = 1; i < layers.length; i++) { scaleFactor = getScale(i); layers[i] = generator.createInstance((int)Math.ceil(bottomWidth / scaleFactor), (int)Math.ceil(bottomHeight / scaleFactor)); } } /** * Used to internally check that the provided scales are valid. */ protected void checkScales() { if( getScale(0) < 0 ) { throw new IllegalArgumentException("The first layer must be more than zero."); } double prevScale = 0; for( int i = 0; i < getNumLayers(); i++ ) { double s = getScale(i); if( s < prevScale ) throw new IllegalArgumentException("Higher layers must be the same size or larger than previous layers."); prevScale = s; } } @Override public void setTo(ImagePyramid input) { for( int i = 0; i < layers.length; i++ ) { getLayer(i).setTo(input.getLayer(i)); } } @Override public T getLayer(int layerNum) { return layers[layerNum]; } public void setFirstLayer(T image) { if( saveOriginalReference ) { layers[0] = image; } else { throw new IllegalArgumentException("Attempting to set the first layer when saveOriginalReference is false"); } } @Override public int getWidth(int layer) { return layers[layer].width; } @Override public int getHeight(int layer) { return layers[layer].height; } @Override public Class getImageType() { return generator.getType(); } @Override public int getInputWidth() { return bottomWidth; } @Override public int getInputHeight() { return bottomHeight; } public boolean isSaveOriginalReference() { return saveOriginalReference; } }




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