gvsig-raster / org.gvsig.raster / trunk / org.gvsig.raster / org.gvsig.raster.algorithm / src / main / java / org / gvsig / raster / algorithm / util / Interpolation.java @ 1891
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/* gvSIG. Geographic Information System of the Valencian Government
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*
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* Copyright (C) 2007-2008 Infrastructures and Transports Department
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* of the Valencian Government (CIT)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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package org.gvsig.raster.algorithm.util; |
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import org.gvsig.fmap.dal.coverage.RasterLocator; |
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import org.gvsig.fmap.dal.coverage.dataset.Buffer; |
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import org.gvsig.fmap.dal.coverage.datastruct.NoData; |
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/**
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* Calculates a pixel value using a interpolation method
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* @author Nacho Brodin nachobrodin@gmail.com
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* @author Victor Olaya
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*/
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public class Interpolation { |
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private Buffer buffer = null; |
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private double nodata = 0; |
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public Interpolation(Buffer buf) { |
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this.buffer = buf;
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NoData nodata = RasterLocator.getManager().getDataStructFactory().createDefaultNoData( |
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1, Buffer.TYPE_DOUBLE); |
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this.nodata = nodata.getValue().doubleValue();
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} |
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private double[] getKernel(int x, int y, int band) { |
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if(buffer.getDataType() == Buffer.TYPE_BYTE) { |
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return getKernelByte(x, y, band);
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} |
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if(buffer.getDataType() == Buffer.TYPE_DOUBLE) { |
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return getKernelByte(x, y, band);
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} |
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if(buffer.getDataType() == Buffer.TYPE_FLOAT) { |
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return getKernelByte(x, y, band);
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} |
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if(buffer.getDataType() == Buffer.TYPE_SHORT) { |
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return getKernelByte(x, y, band);
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} |
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if(buffer.getDataType() == Buffer.TYPE_INT) { |
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return getKernelByte(x, y, band);
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} |
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return null; |
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} |
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public double getNearestNeighbour(double x, double y, int band) { |
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int dy = (int)Math.round(y); |
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int dx = (int)Math.round(x); |
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dy = dy < buffer.getHeight() ? dy : buffer.getHeight() - 1;
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dx = dx < buffer.getWidth() ? dx : buffer.getWidth() - 1;
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if(buffer.getDataType() == Buffer.TYPE_BYTE) { |
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return (double)buffer.getElemByte(dy, dx, band); |
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} |
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if(buffer.getDataType() == Buffer.TYPE_DOUBLE) { |
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return (double)buffer.getElemDouble(dy, dx, band); |
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} |
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if(buffer.getDataType() == Buffer.TYPE_FLOAT) { |
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return (double)buffer.getElemFloat(dy, dx, band); |
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} |
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if(buffer.getDataType() == Buffer.TYPE_SHORT) { |
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return (double)buffer.getElemShort(dy, dx, band); |
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} |
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if(buffer.getDataType() == Buffer.TYPE_INT) { |
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return (double)buffer.getElemInt(dy, dx, band); |
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} |
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return nodata;
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} |
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/**
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* Calcula los valores N y Z para el m?todo bilinear y obtiene el valor del pixel como
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* Z / N
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* @param dx distancia en X desde el centro del pixel hasta el punto. Es un valor entre 0 y 1
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* @param dy distancia en Y desde el centro del pixel hasta el punto. Es un valor entre 0 y 1
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* @param kernel valor del pixel y alrededor
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* @return valor del pixel
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*/
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public double getBilinearValue(double x, double y, int band) { |
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double[] kernel = getKernel((int)x, (int)y, band); |
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double dx = x - ((int) x); |
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double dy = y - ((int) y); |
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double z = 0.0, n = 0.0, d; |
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d = (1.0 - dx) * (1.0 - dy); |
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z += d * kernel[0];
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n += d; |
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d = dx * (1.0 - dy);
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z += d * kernel[1];
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n += d; |
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d = (1.0 - dx) * dy;
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z += d * kernel[2];
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n += d; |
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d = dx * dy; |
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z += d * kernel[3];
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n += d; |
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double b = 0; |
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if(n > 0.0) |
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b = (z / n); |
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return b;
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} |
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/**
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* Calcula los valores N y Z para el m?todo de distancia inversa y calcula el valor del
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* pixel como Z / N.
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* @param dx distancia en X desde el centro del pixel hasta el punto. Es un valor entre 0 y 1
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* @param dy distancia en Y desde el centro del pixel hasta el punto. Es un valor entre 0 y 1
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* @param kernel valor del pixel y alrededor
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* @return valor del pixel
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*/
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public double getInverseDistance(double x, double y, int band) { |
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double[] kernel = getKernel((int)x, (int)y, band); |
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double dx = x - ((int) x); |
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double dy = y - ((int) y); |
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double z = 0.0, n = 0.0, d; |
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d = 1.0 / Math.sqrt(dx * dx + dy * dy); |
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z += d * kernel[0];
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n += d; |
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d = 1.0 / Math.sqrt((1.0 - dx) * ( 1.0 - dx) + dy * dy); |
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z += d * kernel[1];
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n += d; |
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d = 1.0 / Math.sqrt(dx*dx + (1.0-dy)*(1.0-dy)); |
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z += d * kernel[2];
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n += d; |
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d = 1.0 / Math.sqrt((1.0 - dx) *( 1.0 - dx) + (1.0 - dy) * (1.0 - dy)); |
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z += d * kernel[3];
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n += d; |
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double b = 0; |
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if(n > 0.0) |
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b = (z / n); |
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return b;
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} |
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/**
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* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
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* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
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* se tomar? x e y.
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* @param x Coordenada X del pixel inicial
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* @param y Coordenada Y del pixel inicial
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* @param band N?mero de banda.
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* @return Kernel solicitado en forma de array.
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*/
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private double[] getKernelByte(int x, int y, int band) { |
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double[] d = new double[4]; |
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d[0] = (buffer.getElemByte(y, x, band) & 0xff); |
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int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
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int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
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d[1] = (buffer.getElemByte(y, nextX, band) & 0xff); |
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d[2] = (buffer.getElemByte(nextY, x, band) & 0xff); |
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d[3] = (buffer.getElemByte(nextY, nextX, band) & 0xff); |
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return d;
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} |
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/**
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* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
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* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
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* se tomar? x e y.
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* @param x Coordenada X del pixel inicial
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* @param y Coordenada Y del pixel inicial
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* @param band N?mero de banda.
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* @return Kernel solicitado en forma de array.
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*/
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@SuppressWarnings("unused") |
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private double[] getKernelShort(int x, int y, int band) { |
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double[] d = new double[4]; |
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d[0] = (buffer.getElemShort(y, x, band) & 0xffff); |
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int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
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int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
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d[1] = (buffer.getElemShort(y, nextX, band) & 0xffff); |
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d[2] = (buffer.getElemShort(nextY, x, band) & 0xffff); |
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d[3] = (buffer.getElemShort(nextY, nextX, band) & 0xffff); |
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return d;
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} |
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/**
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* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
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* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
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* se tomar? x e y.
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* @param x Coordenada X del pixel inicial
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* @param y Coordenada Y del pixel inicial
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* @param band N?mero de banda.
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* @return Kernel solicitado en forma de array.
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*/
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@SuppressWarnings("unused") |
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private double[] getKernelInt(int x, int y, int band) { |
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double[] d = new double[4]; |
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d[0] = (buffer.getElemInt(y, x, band) & 0xffffffff); |
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int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
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int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
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d[1] = (buffer.getElemInt(y, nextX, band) & 0xffffffff); |
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d[2] = (buffer.getElemInt(nextY, x, band) & 0xffffffff); |
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d[3] = (buffer.getElemInt(nextY, nextX, band) & 0xffffffff); |
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return d;
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} |
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/**
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* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
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* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
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* se tomar? x e y.
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* @param x Coordenada X del pixel inicial
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* @param y Coordenada Y del pixel inicial
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* @param band N?mero de banda.
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* @return Kernel solicitado en forma de array.
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*/
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@SuppressWarnings("unused") |
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private double[] getKernelFloat(int x, int y, int band) { |
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double[] d = new double[4]; |
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d[0] = buffer.getElemFloat(y, x, band);
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int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
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int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
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d[1] = buffer.getElemFloat(y, nextX, band);
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d[2] = buffer.getElemFloat(nextY, x, band);
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d[3] = buffer.getElemFloat(nextY, nextX, band);
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return d;
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} |
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/**
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* Obtiene un kernel de cuatro elemento que corresponden a los pixeles (x, y), (x + 1, y),
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* (x, y + 1), (x + 1, y + 1). Si los pixeles x + 1 o y + 1 se salen del raster de origen
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* se tomar? x e y.
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* @param x Coordenada X del pixel inicial
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* @param y Coordenada Y del pixel inicial
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* @param band N?mero de banda.
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* @return Kernel solicitado en forma de array.
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*/
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@SuppressWarnings("unused") |
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private double[] getKernelDouble(int x, int y, int band) { |
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double[] d = new double[4]; |
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d[0] = buffer.getElemDouble(y, x, band);
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int nextX = ((x + 1) >= buffer.getWidth()) ? x : (x + 1); |
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int nextY = ((y + 1) >= buffer.getHeight()) ? y : (y + 1); |
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d[1] = buffer.getElemDouble(y, nextX, band);
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d[2] = buffer.getElemDouble(nextY, x, band);
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d[3] = buffer.getElemDouble(nextY, nextX, band);
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return d;
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} |
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} |