root / trunk / libraries / libRaster / src / org / gvsig / raster / grid / filter / enhancement / ContrastShortFilter.java @ 10740
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package org.gvsig.raster.grid.filter.enhancement; |
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import org.cresques.filter.RasterBuf; |
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import org.gvsig.raster.dataaccess.buffer.RasterBuffer; |
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/**
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* Filtro de contraste para im?genes de 16 bits.
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* @author Miguel ?ngel Querol Carratal? <querol_mig@gva.es>
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*
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*/
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public class ContrastShortFilter extends ContrastFilter { |
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private short[] px = new short[4]; |
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/**
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* Variable que contendra el incremento del contraste.
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*/
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private short incrContraste = 0; |
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private short diferencia = 0; |
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public ContrastShortFilter(){
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super();
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} |
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public void pre(){ |
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exec = true;
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this.raster = (RasterBuffer) params.get("raster"); |
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height = raster.getHeight(); |
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width = raster.getWidth(); |
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this.incrContraste = ((Integer)this.params.get("incrContraste")).shortValue(); |
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super.pre();
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} |
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/**
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* Algoritmo de contraste
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* @param px3 valores ARGB
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* @return valores ARGB con el algoritmo aplicado
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*/
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private short[] calcContrast(short[] px){ |
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short result = 0; |
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for (int i = 0 ; i < 3 ; i++){ |
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if(incrContraste >= 0){ |
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if (px[i] < 127){ |
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diferencia = (short)(127 - px[i]); |
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result = (short)(px[i] - (short)((diferencia * 5) * (incrContraste * 0.1) / 25)); |
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if(result < 0) result = 0; |
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} |
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if (px[i] > 127){ |
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diferencia = (short)(px[i] - 127); |
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result = (short)(px[i] + (short)((diferencia * 5) * (incrContraste * 0.1) / 25)); |
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if(result > 255) result = 255; |
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} |
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}else{ //incrContraste < 0 |
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if(px[i] < 127){ |
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diferencia = (short)(127 - px[i]); |
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result = (short)(px[i] + (diferencia * (short)(-incrContraste * 0.1) / 25)); |
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if(result > 127) result = 127; |
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if(px[i] == 0 || px[i] == 0) |
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if(incrContraste > -255) |
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result = 0;
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} |
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if(px[i] > 127){ |
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diferencia = (short)(px[i] - 127); |
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result = (short)(px[i] - (diferencia * (short)(-incrContraste * 0.1) / 25)); |
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if (result < 127) result = 127; |
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if(px[i] == 255 || px[i] == 254) |
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if(incrContraste > -255) |
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result = 255;
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} |
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} |
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px[i] = result; |
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} |
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return px;
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} |
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public void process(int col, int line) { |
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raster.getElemShort(line, col, px); |
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px = calcContrast(px); |
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raster.setElemShort(line, col, px); |
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} |
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public int getInRasterDataType() { |
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return RasterBuffer.TYPE_SHORT;
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} |
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public int getOutRasterDataType() { |
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return RasterBuffer.TYPE_SHORT;
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} |
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public Object getResult(String name) { |
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if (name.equals("raster")) |
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return (Object) this.raster; |
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else
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return null; |
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} |
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} |