root / trunk / libraries / libRaster / src / org / gvsig / raster / grid / filter / enhancement / ContrastFilter.java @ 27361
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1 | 10740 | nacho | /* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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2 | *
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3 | * Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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4 | *
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5 | * This program is free software; you can redistribute it and/or
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6 | * modify it under the terms of the GNU General Public License
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7 | * as published by the Free Software Foundation; either version 2
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8 | * of the License, or (at your option) any later version.
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9 | *
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10 | * This program is distributed in the hope that it will be useful,
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 | * GNU General Public License for more details.
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14 | *
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15 | * You should have received a copy of the GNU General Public License
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16 | * along with this program; if not, write to the Free Software
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17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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18 | */
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19 | package org.gvsig.raster.grid.filter.enhancement; |
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20 | |||
21 | 12008 | bsanchez | import org.gvsig.raster.buffer.RasterBuffer; |
22 | 18388 | bsanchez | import org.gvsig.raster.dataset.IBuffer; |
23 | 11652 | bsanchez | import org.gvsig.raster.dataset.Params; |
24 | 10740 | nacho | import org.gvsig.raster.grid.filter.RasterFilter; |
25 | /**
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26 | * Clase base para todos los filtros de contraste
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27 | 12333 | bsanchez | *
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28 | 12138 | bsanchez | * @version 31/05/2007
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29 | 11574 | nacho | * @author Miguel ?ngel Querol Carratal? (miguelangel.querol@iver.es)
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30 | 10740 | nacho | */
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31 | 11714 | bsanchez | public class ContrastFilter extends RasterFilter { |
32 | 12008 | bsanchez | public static String[] names = new String[] {"contrast"}; |
33 | 11942 | bsanchez | |
34 | 10740 | nacho | /**
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35 | * Variable que contendra el incremento del contraste.
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36 | */
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37 | int incrContraste = 0; |
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38 | 11942 | bsanchez | |
39 | 10740 | nacho | /**
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40 | 12333 | bsanchez | * Constructor. Llama al constructor de la clase base y asigna el
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41 | 12138 | bsanchez | * nombre del filtro.
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42 | 10740 | nacho | */
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43 | public ContrastFilter(){
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44 | 11986 | bsanchez | setName(names[0]);
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45 | 10740 | nacho | } |
46 | 11942 | bsanchez | |
47 | 11899 | bsanchez | /*
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48 | * (non-Javadoc)
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49 | * @see org.gvsig.raster.grid.filter.RasterFilter#pre()
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50 | */
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51 | 10740 | nacho | public void pre() { |
52 | 12008 | bsanchez | exec = true;
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53 | 17108 | nbrodin | raster = rasterResult; |
54 | 12008 | bsanchez | raster = (RasterBuffer) params.get("raster");
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55 | height = raster.getHeight(); |
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56 | width = raster.getWidth(); |
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57 | incrContraste = ((Integer) params.get("incrContraste")).intValue(); |
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58 | 18388 | bsanchez | rasterResult = RasterBuffer.getBuffer(IBuffer.TYPE_BYTE, raster.getWidth(), raster.getHeight(), raster.getBandCount(), true);
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59 | 10740 | nacho | } |
60 | |||
61 | 11899 | bsanchez | /*
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62 | * (non-Javadoc)
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63 | * @see org.gvsig.raster.grid.filter.RasterFilter#post()
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64 | */
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65 | 10740 | nacho | public void post() { |
66 | 11899 | bsanchez | // En caso de que nadie apunte a raster, se liberar? su memoria.
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67 | raster = null;
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68 | 10740 | nacho | } |
69 | |||
70 | /**
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71 | * Obtiene el incremento de contraster que se est? aplicando
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72 | * @return entero que representa el incremento de contraste aplicado.
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73 | */
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74 | public int getContrastIncrease(){ |
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75 | return this.incrContraste; |
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76 | } |
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77 | 11942 | bsanchez | |
78 | 11652 | bsanchez | /*
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79 | * (non-Javadoc)
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80 | * @see org.gvsig.raster.grid.filter.IRasterFilter#getGroup()
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81 | */
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82 | public String getGroup() { |
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83 | 19859 | nbrodin | return "realces"; |
84 | 11652 | bsanchez | } |
85 | 11942 | bsanchez | |
86 | 11652 | bsanchez | /*
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87 | * (non-Javadoc)
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88 | * @see org.gvsig.raster.grid.filter.IRasterFilter#getParams()
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89 | */
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90 | 12030 | bsanchez | public Params getUIParams(String nameFilter) { |
91 | 11672 | bsanchez | Params params = new Params();
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92 | params.setParam("Contrast",
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93 | 14249 | nbrodin | new Integer(incrContraste), |
94 | 11672 | bsanchez | Params.SLIDER, |
95 | 11706 | bsanchez | new String[]{ "-255", "255", "50", "1", "25" }); //min, max, valor defecto, intervalo peque?o, intervalo grande; |
96 | 11672 | bsanchez | return params;
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97 | 11652 | bsanchez | } |
98 | |||
99 | /*
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100 | * (non-Javadoc)
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101 | 11714 | bsanchez | * @see org.gvsig.raster.grid.filter.RasterFilter#getInRasterDataType()
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102 | */
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103 | public int getInRasterDataType() { |
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104 | return 0; |
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105 | } |
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106 | |||
107 | /*
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108 | * (non-Javadoc)
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109 | * @see org.gvsig.raster.grid.filter.RasterFilter#getOutRasterDataType()
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110 | */
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111 | public int getOutRasterDataType() { |
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112 | 18388 | bsanchez | return RasterBuffer.TYPE_BYTE;
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113 | 11714 | bsanchez | } |
114 | |||
115 | /*
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116 | * (non-Javadoc)
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117 | 12008 | bsanchez | * @see org.gvsig.raster.grid.filter.enhancement.ContrastFilter#getResult(java.lang.String)
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118 | 11714 | bsanchez | */
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119 | public Object getResult(String name) { |
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120 | 21803 | bsanchez | if (name.equals("raster")) { |
121 | if (!exec)
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122 | return this.raster; |
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123 | return this.rasterResult; |
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124 | } |
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125 | 11714 | bsanchez | return null; |
126 | } |
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127 | |||
128 | /*
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129 | * (non-Javadoc)
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130 | * @see org.gvsig.raster.grid.filter.RasterFilter#process(int, int)
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131 | */
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132 | 27361 | nbrodin | public void process(int x, int y) throws InterruptedException { |
133 | 11714 | bsanchez | } |
134 | 11942 | bsanchez | |
135 | /**
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136 | * Algoritmo de contraste
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137 | * @param px valor de la banda
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138 | * @return valor de la banda con el algoritmo aplicado
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139 | */
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140 | protected int calcContrast(int px) { |
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141 | int result;
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142 | int diferencia = 127 - px; |
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143 | if (incrContraste >= 0) { |
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144 | result = (int) (px - (0.02 * diferencia * incrContraste)); // ((5.0 * 0.1) / 25) = 0.02 |
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145 | } else {
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146 | result = (int) (px - (0.004 * diferencia * incrContraste)); // (0.1 / 25) = 0.004; |
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147 | if (px < 127) { |
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148 | if (result > 127) result = 127; |
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149 | } else {
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150 | if (result < 127) result = 127; |
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151 | } |
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152 | } |
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153 | if (result < 0) |
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154 | result = 0;
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155 | else {
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156 | if (result > 255) |
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157 | result = 255;
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158 | } |
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159 | return result;
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160 | } |
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161 | 11963 | bsanchez | |
162 | /*
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163 | * (non-Javadoc)
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164 | * @see org.gvsig.raster.grid.filter.RasterFilter#getNames()
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165 | */
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166 | public String[] getNames() { |
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167 | return names;
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168 | } |
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169 | 11652 | bsanchez | } |