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/*
 * 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.struct.image;

import boofcv.core.image.GeneralizedImageOps;

import java.lang.reflect.Array;

/**
 * 

* An image class for images with multiple bands/colors where each band is stored as an independent * {@link ImageSingleBand}. MultiSpectral image fully supports all functions inside of * {@link ImageBase}. Each internal image has the same width, height, startIndex, and stride. *

* *

* For example, in a RGB image there would be three bands one for each color, * and each color would be stored in its own gray scale image. To access the image for a particular * band call {@link #getBand(int)}. To get the RGB value for a pixel (x,y) one would need to: *

 * int red = image.get(0).get(x,y);
 * int green = image.get(1).get(x,y);
 * int blue = image.get(2).get(x,y);
 * 
* Setting the RGB value of pixel (x,y) is done in a similar manor: *
 * image.get(0).get(x,y,red);
 * image.get(1).get(x,y,green);
 * image.get(2).get(x,y,blue);
 * 
*

* *

* May image processing operations can be run independently on each color band. This is useful since many * operations have been written for {@link ImageSingleBand}, but not MultiSpectral yet. *

 * for( int i = 0; i < image.numBands(); i++ ) {
 *     SomeGrayImageFilter.process( image.getBand(0) );
 * }    
 * 
*

* * @author Peter Abeles */ // TODO Rename to ImagePlanar ? public class MultiSpectral extends ImageMultiBand>{ /** * Type of image in each band */ public Class type; /** * Set of gray scale images */ public T bands[]; /** * Creates a MultiSpectral image with the specified properties. * * @param type The type of image which each band is stored as. * @param width Width of the image. * @param height Height of the image. * @param numBands Total number of bands. */ public MultiSpectral(Class type, int width, int height, int numBands) { this.type = type; this.stride = width; this.width = width; this.height = height; this.bands = (T[]) Array.newInstance(type, numBands); for (int i = 0; i < numBands; i++) { bands[i] = GeneralizedImageOps.createSingleBand(type, width, height); } this.imageType = ImageType.ms(numBands,type); } /** * Declares internal arrays for storing each band, but not the images in each band. * * @param type The type of image which each band is stored as. * @param numBands Number of bands in the image. */ public MultiSpectral(Class type, int numBands) { this.type = type; this.bands = (T[]) Array.newInstance(type, numBands); this.imageType = ImageType.ms(numBands,type); } /** * Type of image each band is stored as. * * @return The type of ImageSingleBand which each band is stored as. */ public Class getBandType() { return type; } /** * Returns the number of bands or colors stored in this image. * * @return Number of bands in the image. */ @Override public int getNumBands() { return bands.length; } /** * Returns a band in the multi-band image. * * @param band Which band should be returned. * @return Image band */ public T getBand(int band) { if (band >= bands.length || band < 0) throw new IllegalArgumentException("The specified band is out of bounds: "+band); return bands[band]; } /** * Creates a sub-image from 'this' image. The subimage will share the same internal array * that stores each pixel's value, but will only pertain to an axis-aligned rectangular segment * of the original. * * * @param x0 x-coordinate of top-left corner of the sub-image. * @param y0 y-coordinate of top-left corner of the sub-image. * @param x1 x-coordinate of bottom-right corner of the sub-image. * @param y1 y-coordinate of bottom-right corner of the sub-image. * @param subimage * @return A sub-image of this image. */ @Override public MultiSpectral subimage(int x0, int y0, int x1, int y1, MultiSpectral subimage) { if (x0 < 0 || y0 < 0) throw new IllegalArgumentException("x0 or y0 is less than zero"); if (x1 < x0 || y1 < y0) throw new IllegalArgumentException("x1 or y1 is less than x0 or y0 respectively"); if (x1 > width || y1 > height) throw new IllegalArgumentException("x1 or y1 is more than the width or height respectively"); MultiSpectral ret = new MultiSpectral(type,bands.length); ret.stride = Math.max(width, stride); ret.width = x1 - x0; ret.height = y1 - y0; ret.startIndex = startIndex + y0 * stride + x0; ret.subImage = true; for( int i = 0; i < bands.length; i++ ) { ret.bands[i] = (T)bands[i].subimage(x0,y0,x1,y1); } return ret; } /** * Sets the values of each pixel equal to the pixels in the specified matrix. * Automatically resized to match the input image. * * @param orig The original image whose value is to be copied into this one */ @Override public void setTo( MultiSpectral orig) { if (orig.width != width || orig.height != height) reshape(orig.width,orig.height); if( orig.getNumBands() != getNumBands() ) throw new IllegalArgumentException("The number of bands must be the same"); if( orig.getBandType() != getBandType() ) throw new IllegalArgumentException("The band type must be the same"); int N = orig.getNumBands(); for( int i = 0; i < N; i++ ) { bands[i].setTo(orig.getBand(i)); } } /** * Changes the image's width and height without declaring new memory. If the internal array * is not large enough to store the new image an IllegalArgumentException is thrown. * * @param width The new width. * @param height The new height. */ @Override public void reshape(int width, int height) { for( int i = 0; i < bands.length; i++ ) { bands[i].reshape(width,height); } this.startIndex = 0; this.stride = width; this.width = width; this.height = height; } /** * Creates a new image of the same type and number of bands * * @param imgWidth image width * @param imgHeight image height * @return new image */ @Override public MultiSpectral _createNew(int imgWidth, int imgHeight) { return new MultiSpectral(type,imgWidth,imgHeight,bands.length); } /** * Returns a new {@link MultiSpectral} which references the same internal single band images at this one. * * @param which List of bands which will comprise the new image * @return New image */ public MultiSpectral partialSpectrum( int ...which ) { MultiSpectral out = new MultiSpectral(getBandType(),which.length); out.setWidth(width); out.setHeight(height); out.setStride(stride); for (int i = 0; i < which.length; i++) { out.setBand(i,getBand(which[i])); } return out; } public void setBandType(Class type) { this.type = type; } public T[] getBands() { return bands; } public void setBands(T[] bands) { this.bands = bands; } public void setBand( int which , T image ) { this.bands[which] = image; } }




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