2 * PROJECT: NyARToolkit
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3 * --------------------------------------------------------------------------------
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4 * This work is based on the original ARToolKit developed by
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7 * HITLab, University of Washington, Seattle
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8 * http://www.hitl.washington.edu/artoolkit/
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10 * The NyARToolkit is Java version ARToolkit class library.
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11 * Copyright (C)2008 R.Iizuka
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13 * This program is free software; you can redistribute it and/or
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14 * modify it under the terms of the GNU General Public License
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15 * as published by the Free Software Foundation; either version 2
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16 * of the License, or (at your option) any later version.
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18 * This program is distributed in the hope that it will be useful,
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19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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21 * GNU General Public License for more details.
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23 * You should have received a copy of the GNU General Public License
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24 * along with this framework; if not, write to the Free Software
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25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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27 * For further information please contact.
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28 * http://nyatla.jp/nyatoolkit/
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29 * <airmail(at)ebony.plala.or.jp>
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32 package jp.nyatla.nyartoolkit.core2.rasteranalyzer.threshold;
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34 import jp.nyatla.nyartoolkit.NyARException;
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35 import jp.nyatla.nyartoolkit.core.raster.*;
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36 import jp.nyatla.nyartoolkit.core.rasterreader.INyARBufferReader;
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37 import jp.nyatla.nyartoolkit.core.types.*;
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41 * 明点と暗点をPタイル法で検出して、その中央値を閾値とする。
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45 public class NyARRasterThresholdAnalyzer_SlidePTile implements INyARRasterThresholdAnalyzer
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47 private int _persentage;
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49 private int _threshold;
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52 * @param i_persentage
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53 * 0<=50であること。白/黒マーカーの場合は10~20を推奨 正の場合、黒点を基準にします。 負の場合、白点を基準にします。
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54 * (CMOSカメラの場合、基準点は白点の方が良い)
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56 public NyARRasterThresholdAnalyzer_SlidePTile(int i_persentage)
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58 assert (0 <= i_persentage && i_persentage <= 50);
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59 this._persentage = i_persentage;
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62 private int createHistgram(INyARBufferReader i_reader,NyARIntSize i_size, int[] o_histgram) throws NyARException
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64 int[][] in_buf = (int[][]) i_reader.getBuffer();
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65 int[] histgram = o_histgram;
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68 for (int i = 0; i < 256; i++) {
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72 for (int y = 0; y < i_size.h; y++) {
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74 for (int x = 0; x < i_size.w; x++) {
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75 int v = in_buf[y][x];
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79 sum = sum + sum2 / i_size.w;
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82 int th_pixcels = i_size.w * i_size.h * this._persentage / 100;
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88 for (th_b = 0; th_b < 254; th_b++) {
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89 th_wk -= histgram[th_b];
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96 for (th_w = 255; th_w > 1; th_w--) {
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97 th_wk -= histgram[th_w];
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103 return (th_w + th_b) / 2;
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106 public void analyzeRaster(INyARRaster i_input) throws NyARException
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108 final INyARBufferReader buffer_reader=i_input.getBufferReader();
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109 assert (buffer_reader.isEqualBufferType(INyARBufferReader.BUFFERFORMAT_INT2D_GLAY_8));
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111 int[] histgram = new int[256];
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113 this._threshold = createHistgram(buffer_reader,i_input.getSize(), histgram);
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122 public void debugDrawHistgramMap(INyARRaster i_input, INyARRaster i_output) throws NyARException
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124 INyARBufferReader in_buffer_reader=i_input.getBufferReader();
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125 INyARBufferReader out_buffer_reader=i_output.getBufferReader();
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126 assert (in_buffer_reader.isEqualBufferType(INyARBufferReader.BUFFERFORMAT_INT2D_GLAY_8));
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127 assert (out_buffer_reader.isEqualBufferType(INyARBufferReader.BUFFERFORMAT_INT2D_GLAY_8));
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129 NyARIntSize size = i_output.getSize();
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131 int[][] out_buf = (int[][]) out_buffer_reader.getBuffer();
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133 for (int y = 0; y < size.h; y++) {
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134 for (int x = 0; x < size.w; x++) {
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139 int[] histgram = new int[256];
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140 int threshold = createHistgram(in_buffer_reader,i_input.getSize(), histgram);
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141 for (int i = 255; i > 0; i--) {
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142 histgram[i] = Math.abs(histgram[i]);
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147 for (int i = 0; i < 255; i++) {
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148 if (max_v < histgram[i]) {
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149 max_v = histgram[i];
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153 for (int i = 0; i < size.h; i++) {
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154 out_buf[i][0] = 128;
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155 out_buf[i][128] = 128;
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156 out_buf[i][255] = 128;
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159 for (int i = 0; i < 255; i++) {
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160 out_buf[histgram[i] * (size.h - 1) / max_v][i] = 255;
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163 for (int i = 0; i < size.h; i++) {
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164 out_buf[i][threshold] = 255;
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169 public int getThreshold()
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171 return this._threshold;
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174 public int getThreshold(int i_x, int i_y)
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176 return this._threshold;
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