1 | "use strict";
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2 |
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3 | var progressVal = 0;
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4 |
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5 | var show_progress = 5;
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6 |
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7 | var start_hist_delay = 4000;
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8 | var mini_delay = 300;
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9 |
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10 |
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11 | var hasLocalStorage = false;
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12 | var needToComputeHistograms = true;
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13 | var quantHSLHistogramArray;
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14 |
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15 |
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16 | function drawImage(imageObj, canvasId) {
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17 | "use strict";
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18 | var imgCanvas = document.getElementById(canvasId),
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19 | context, imageData, data,
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20 | imageX = 0, imageY = 0,
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21 | imageWidth = imageObj.width,
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22 | imageHeight = imageObj.height;
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23 |
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24 | context = imgCanvas.getContext('2d');
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25 | context.drawImage(imageObj, imageX, imageY, imageWidth, imageHeight);
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26 | imageData = context.getImageData(imageX, imageY, imageWidth, imageHeight);
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27 |
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28 | return imageData;
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29 | }
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30 |
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31 | function createHSLHistogram(imageObj, quant)
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32 | {
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33 | var i;
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34 |
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35 | if (!$('#hsl_canvas').length) {
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36 | $('<canvas>', {id: 'hsl_canvas'}).hide().appendTo('body');
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37 | }
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38 |
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39 | var imageData = drawImage(imageObj,'hsl_canvas');
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40 |
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41 | var outputLength = quant * quant * quant;
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42 | var outputArray = new Array(outputLength);
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43 | for (i=0; i<outputLength; i++) {
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44 | outputArray[i] = 0;
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45 | }
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46 |
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47 | var total = 0.0;
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48 |
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49 | var log2 = Math.log(2);
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50 |
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51 | //calculate value to shift by (log base 2)
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52 |
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53 | var shift_sat = Math.floor(Math.log(quant)/log2);
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54 | var shift_hue = Math.floor(Math.log(quant*quant)/log2);
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55 |
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56 | //console.log("bit-shift sat = " + shift_sat);
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57 | //console.log("bit-shift hue = " + shift_hue);
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58 |
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59 | var data = imageData.data;
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60 |
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61 | //Loop through each pixel
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62 | var y,p;
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63 | for (y=0,p=0; y<imageObj.height; y++) {
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64 | // setTimeout(function() {
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65 | var x;
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66 | for (x=0; x<imageObj.width; x++,p+=4) {
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67 | // convert 4 byte data value into a colour pixel
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68 | var rgb_c = new RGBColour(data[p],data[p+1],data[p+2],data[p+3]/255.0);
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69 | var hsl = new rgb_c.getHSL();
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70 |
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71 | // express h,s and b in the range 0..1
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72 |
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73 | var h = hsl.h / 360.0;
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74 | var s = hsl.s / 100.0;
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75 | var b = hsl.l / 100.0;
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76 |
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77 | var result = (Math.floor(h * (quant - 1)) << shift_hue)
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78 | | (Math.floor(s * (quant - 1)) << shift_sat)
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79 | | Math.floor(b * (quant - 1));
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80 |
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81 | //number of opaque pixels
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82 | var count = hsl.a; // 'a' is naturally in the range 0..1
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83 |
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84 | //add to the total number of opaque pixels
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85 | total += count;
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86 |
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87 | //add the frequency of each colour to the histogram
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88 | outputArray[result] += count;
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89 | }
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90 | // },4);
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91 | }
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92 |
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93 | //Normalise the histogram, based on the number of opaque pixels
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94 | for (i=0; i<outputArray.length; i++) {
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95 | outputArray[i] = outputArray[i] / total;
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96 | }
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97 |
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98 | return outputArray;
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99 | }
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100 |
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101 | var flag_comparison_array = Array(2);
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102 | var clicked_on_count = 0;
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103 |
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104 | function quantizedColourHistogramComparison(quant_colour_hist1,quant_colour_hist2)
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105 | {
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106 | // Assumes both histograms are of the same length
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107 |
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108 | var i;
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109 | var quant_product = 0.0;
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110 |
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111 | //Loop through and compare the histograms
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112 | for (i=0; i<quant_colour_hist1.length; i++) {
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113 | //take the overlap
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114 | quant_product += Math.min(quant_colour_hist1[i], quant_colour_hist2[i]);
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115 |
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116 | // consider replacing with abs for difference
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117 | }
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118 |
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119 | alert("Product for HSL histogram: " + quant_product);
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120 |
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121 | }
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122 |
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123 |
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124 | function displayFlags(img_list,$displayDiv,$progressArea,$progressBar)
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125 | {
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126 | var img_list_len = img_list.length;
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127 |
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128 | if (img_list_len==0) {
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129 | return;
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130 | }
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131 | else if (img_list_len>show_progress) {
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132 | $progressArea.slideDown();
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133 | }
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134 |
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135 | img_list.sort();
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136 |
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137 | var root_img_re = /^.*\/(.*?)\..*?$/;
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138 |
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139 | var progress_step = 100.0 / img_list_len;
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140 |
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141 | var callback_count = 0;
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142 |
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143 | var i;
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144 | for (i=0; i<img_list.length; i++) {
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145 | var img_url = img_list[i];
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146 | var img_matches = root_img_re.exec(img_url);
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147 | var title = img_matches[1];
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148 |
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149 | var imageObj = new Image();
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150 | imageObj.onload = function() {
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151 | callback_count++;
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152 | progressVal += progress_step;
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153 | $progressBar.progressbar('value',progressVal);
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154 |
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155 | if (callback_count == img_list_len) {
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156 | if (img_list_len>show_progress) {
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157 | progressVal = 100;
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158 | $progressBar.progressbar('value',progressVal);
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159 | //$progressArea.slideUp();
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160 |
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161 | // Now move on and start computing colour histograms
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162 | setTimeout(function()
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163 | { doneDisplayFlags(img_list,$progressArea,$progressBar); }
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164 | ,start_hist_delay);
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165 | }
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166 | }
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167 | };
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168 |
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169 |
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170 | /*
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171 | $("h2").live('mousedown', function(e) {
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172 | if( (e.which == 1) ) {
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173 | alert("left button");
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174 | }if( (e.which == 3) ) {
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175 | alert("right button");
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176 | }else if( (e.which == 2) ) {
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177 | alert("middle button");
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178 | }
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179 | e.preventDefault();
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180 | }).live('contextmenu', function(e){
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181 | e.preventDefault();
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182 | });
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183 | */
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184 |
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185 |
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186 |
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187 | imageObj.onclick = function(e) {
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188 | // Store result of HSL quantization in the image object/tag
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189 | if (!this.quantHSLHist) {
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190 | // Only need to compute this if it is not already stored in the object/tag
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191 | this.quantHSLHist = createHSLHistogram(this,16);
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192 | console.log(this.quantHSLHist);
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193 | }
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194 |
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195 | if (e.which == 1 ) {
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196 | // Left => use in comparison pair
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197 | flag_comparison_array[clicked_on_count] = this.quantHSLHist;
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198 |
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199 | clicked_on_count++;
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200 | if (clicked_on_count==2) {
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201 | // trigger comparison
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202 | quantizedColourHistogramComparison(flag_comparison_array[0],flag_comparison_array[1]);
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203 | clicked_on_count=0;
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204 | }
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205 | }
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206 | else if (e.which == 2) {
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207 | // Middle => fix on this and do similarity with everything else
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208 | var fix_id = this.id;
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209 | e.preventDefault();
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210 | }
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211 |
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212 | };
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213 |
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214 |
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215 | imageObj.src = img_url;
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216 | imageObj.title = title;
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217 | imageObj.id = "flag-img-" + i;
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218 |
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219 | $displayDiv.append(imageObj);
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220 | }
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221 | }
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222 |
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223 | function computeFlagHistogramChain(chain_count, img_list_len,
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224 | progressVal, progress_step,
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225 | $progressArea,$progressBar)
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226 | {
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227 | var flag_id = "flag-img-" + chain_count;
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228 | console.log("Processing Image ID: " + flag_id);
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229 | var imageObj = document.getElementById(flag_id);
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230 |
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231 | if (!imageObj.quantHSLHist) {
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232 | // Only need to compute this if it is not
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233 | // already stored in the object/tag
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234 | imageObj.quantHSLHist = createHSLHistogram(imageObj,16);
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235 | //console.log(imageObj.quantHSLHist);
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236 | }
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237 |
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238 | if (chain_count < img_list_len-1) {
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239 | progressVal += progress_step;
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240 | $progressBar.progressbar('value',progressVal);
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241 |
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242 | setTimeout(function()
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243 | { computeFlagHistogramChain(chain_count+1,img_list_len,
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244 | progressVal, progress_step,
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245 | $progressArea,$progressBar)
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246 | }
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247 | ,mini_delay // any time delay causes break in 'rendering' thread, even 0!
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248 | );
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249 |
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250 | }
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251 | else {
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252 | $progressArea.find('span:first').text("Done.");
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253 | if (img_list_len>show_progress) {
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254 | progressVal = 100;
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255 | $progressBar.progressbar('value',progressVal);
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256 | $progressArea.slideUp();
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257 | }
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258 |
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259 | doneComputingHistograms(img_list_len);
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260 | }
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261 | }
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262 |
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263 |
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264 | function computeFlagHistograms(img_list,$progressArea,$progressBar)
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265 | {
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266 | var img_list_len = img_list.length;
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267 |
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268 |
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269 | if (img_list_len==0) {
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270 | $progressArea.find('span:first').text("Empty list: no computation needed.");
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271 | return;
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272 | }
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273 |
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274 |
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275 | $progressArea.find('span:first').text("Computing histograms:");
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276 | progressVal = 0;
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277 |
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278 | if (img_list_len>show_progress) {
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279 | $progressArea.slideDown();
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280 | }
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281 |
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282 | var progress_step = 100.0 / img_list_len;
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283 |
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284 | // Start the chaining process
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285 | setTimeout(function()
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286 | { computeFlagHistogramChain(0,img_list_len,
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287 | progressVal, progress_step,
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288 | $progressArea,$progressBar)
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289 | }
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290 | ,mini_delay // any time delay causes break in 'rendering' thread, even 0!
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291 | );
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292 |
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293 | }
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294 |
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295 | function doneComputingHistograms(img_list_len)
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296 | {
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297 | if (hasLocalStorage) {
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298 | // build up quantHSLHistogramArray from all the images
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299 |
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300 | quantHSLHistogramArray = new Array(img_list_len);
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301 | var i;
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302 | for (i=0; i<img_list_len; i++) {
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303 | var flag_id = "flag-img-" + i;
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304 | var imageObj = document.getElementById(flag_id);
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305 | quantHSLHistogramArray[i] = imageObj.quantHSLHist;
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306 | }
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307 |
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308 | console.log("Storing computed HSL histograms in localStorage");
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309 | localStorage.quantHSLHistogramArray = JSON.stringify(quantHSLHistogramArray);
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310 | }
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311 | }
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312 |
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313 | function doneDisplayFlags(img_list,$progressArea,$progressBar)
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314 | {
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315 | hasLocalStorage = false;
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316 | needToComputeHistograms = true;
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317 |
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318 | if (typeof(Storage) !== "undefined") {
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319 | hasLocalStorage = true;
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320 |
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321 | if (localStorage.quantHSLHistogramArray) {
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322 |
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323 | console.log("Retrieving quantized HSL histograms");
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324 |
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325 | var stored_hist_array = JSON.parse(localStorage["quantHSLHistogramArray"]);
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326 | if (stored_hist_array.length == img_list.length) {
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327 | console.log("Different number of images detected => regenerating");
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328 |
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329 | // Assume if the number of images process hasn't changed, then neither
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330 | // has the stored historgram values
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331 |
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332 | quantHSLHistogramArray = stored_hist_array;
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333 |
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334 | var i;
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335 | for (i=0; i<img_list.length; i++) {
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336 | var flag_id = "flag-img-" + i;
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337 | var imageObj = document.getElementById(flag_id);
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338 | imageObj.quantHSLHist = quantHSLHistogramArray[i];
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339 | }
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340 |
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341 |
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342 | needToComputeHistograms = false;
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343 | }
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344 | }
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345 | }
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346 |
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347 |
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348 | if (needToComputeHistograms) {
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349 | computeFlagHistograms(img_list,$progressArea,$progressBar);
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350 | }
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351 | else {
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352 | $progressArea.slideUp();
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353 | doneComputingHistograms(img_list.length);
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354 | }
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355 |
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356 |
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357 |
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358 | } |
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