<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <title>AlbumShaper: contrast.cpp File Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <link href="doxygen.css" rel="stylesheet" type="text/css"/> </head> <body> <!-- Generated by Doxygen 1.6.2 --> <div class="navigation" id="top"> <div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="annotated.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul> </div> <div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>File Members</span></a></li> </ul> </div> </div> <div class="contents"> <h1>contrast.cpp File Reference</h1><code>#include <qimage.h></code><br/> <code>#include <qstring.h></code><br/> <code>#include <qapplication.h></code><br/> <code>#include "<a class="el" href="contrast_8h_source.html">contrast.h</a>"</code><br/> <code>#include "../tools/imageTools.h"</code><br/> <code>#include "../../gui/statusWidget.h"</code><br/> <div class="dynheader"> Include dependency graph for contrast.cpp:</div> <div class="dynsection"> </div> <p><a href="contrast_8cpp_source.html">Go to the source code of this file.</a></p> <table border="0" cellpadding="0" cellspacing="0"> <tr><td colspan="2"><h2>Functions</h2></td></tr> <tr><td class="memItemLeft" align="right" valign="top">QImage * </td><td class="memItemRight" valign="bottom"><a class="el" href="contrast_8cpp.html#a5a7a57ce540b35b0987153951f45a398">enhanceImageContrast</a> (QString filename, <a class="el" href="classStatusWidget.html">StatusWidget</a> *<a class="el" href="redEye__internal_8h.html#a65b682074aef9e63bb1dad48c3e9e9df">status</a>)</td></tr> <tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="contrast_8cpp.html#abf6ca618d520ced74fb880d327614308">enhanceImageContrast</a> (QImage *<a class="el" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>, <a class="el" href="classStatusWidget.html">StatusWidget</a> *<a class="el" href="redEye__internal_8h.html#a65b682074aef9e63bb1dad48c3e9e9df">status</a>)</td></tr> </table> <hr/><h2>Function Documentation</h2> <a class="anchor" id="abf6ca618d520ced74fb880d327614308"></a><!-- doxytag: member="contrast.cpp::enhanceImageContrast" ref="abf6ca618d520ced74fb880d327614308" args="(QImage *editedImage, StatusWidget *status)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">void enhanceImageContrast </td> <td>(</td> <td class="paramtype">QImage * </td> <td class="paramname"> <em>editedImage</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="classStatusWidget.html">StatusWidget</a> * </td> <td class="paramname"> <em>status</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p><p>------ Contrast stretching - <a href="http://www.ph.tn.tudelft.nl/Courses/FIP/frames/fip-istogram.html">http://www.ph.tn.tudelft.nl/Courses/FIP/frames/fip-istogram.html</a> ------- </p> </p> <p>Definition at line <a class="el" href="contrast_8cpp_source.html#l00105">105</a> of file <a class="el" href="contrast_8cpp_source.html">contrast.cpp</a>.</p> <p>References <a class="el" href="jpegInternal_8h_source.html#l00125">b</a>, <a class="el" href="imageTools_8cpp_source.html#l00264">HSVtoRGB()</a>, <a class="el" href="statusWidget_8cpp_source.html#l00119">StatusWidget::incrementProgress()</a>, <a class="el" href="redEye__internal_8h_source.html#l00031">newProgress</a>, <a class="el" href="imageTools_8cpp_source.html#l00231">RGBtoHSV()</a>, <a class="el" href="imageTools_8cpp_source.html#l00217">RGBtoL()</a>, <a class="el" href="statusWidget_8cpp_source.html#l00125">StatusWidget::setStatus()</a>, <a class="el" href="statusWidget_8cpp_source.html#l00089">StatusWidget::showProgressBar()</a>, and <a class="el" href="redEye__internal_8h_source.html#l00028">updateIncrement</a>.</p> <p><div class="fragment"><pre class="fragment"><a name="l00106"></a>00106 { <a name="l00107"></a>00107 <span class="comment">//setup progress bar</span> <a name="l00108"></a>00108 <span class="keywordflow">if</span>(status) <a name="l00109"></a>00109 { <a name="l00110"></a>00110 QString statusMessage = qApp->translate( <span class="stringliteral">"enhanceImageContrast"</span>, <span class="stringliteral">"Enhancing Contrast:"</span> ); <a name="l00111"></a>00111 status-><a class="code" href="classStatusWidget.html#a57d461014070b9d651c36bd157cab9c1" title="Initializes the progress bar.">showProgressBar</a>( statusMessage, 100 ); <a name="l00112"></a>00112 qApp->processEvents(); <a name="l00113"></a>00113 } <a name="l00114"></a>00114 <a name="l00115"></a>00115 <span class="comment">//update progress bar for every 1% of completion</span> <a name="l00116"></a>00116 <span class="keyword">const</span> <span class="keywordtype">int</span> <a class="code" href="redEye__internal_8h.html#a32598f506d413f48cda8e1c930dae6b3">updateIncrement</a> = (int) ( 0.01 * <a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->width() * <a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->height() ); <a name="l00117"></a>00117 <span class="keywordtype">int</span> <a class="code" href="redEye__internal_8h.html#acaa08422437cae250a76ca488cbe1567">newProgress</a> = 0; <a name="l00118"></a>00118 <a name="l00122"></a>00122 <a name="l00123"></a>00123 <span class="comment">//construct intensity histograph</span> <a name="l00124"></a>00124 <span class="keywordtype">int</span> grayVals[256]; <a name="l00125"></a>00125 <span class="keywordtype">int</span> i=0; <a name="l00126"></a>00126 <span class="keywordflow">for</span>(i=0; i<256; i++) { grayVals[i] = 0; } <a name="l00127"></a>00127 <a name="l00128"></a>00128 <span class="comment">//populate histogram by iterating over all image pixels</span> <a name="l00129"></a>00129 <span class="keywordtype">int</span> numPixels = <a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->width()*<a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->height(); <a name="l00130"></a>00130 QRgb* rgb; <a name="l00131"></a>00131 <span class="keywordtype">double</span> grayValue; <a name="l00132"></a>00132 uchar* scanLine; <a name="l00133"></a>00133 <span class="keywordtype">int</span> x, y; <a name="l00134"></a>00134 <span class="keywordflow">for</span>( y=0; y<<a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->height(); y++) <a name="l00135"></a>00135 { <a name="l00136"></a>00136 <span class="comment">//iterate over each selected pixel in scanline</span> <a name="l00137"></a>00137 scanLine = <a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->scanLine(y); <a name="l00138"></a>00138 <span class="keywordflow">for</span>( x=0; x<<a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->width(); x++) <a name="l00139"></a>00139 { <a name="l00140"></a>00140 rgb = ((QRgb*)scanLine+x); <a name="l00141"></a>00141 grayValue = <a class="code" href="imageTools_8cpp.html#a88f4928313fa9ef0e9232f3087189b65" title="find luminance of a rgb color triplet">RGBtoL</a>(rgb); <a name="l00142"></a>00142 grayVals[(int)grayValue]++; <a name="l00143"></a>00143 } <span class="comment">//for x</span> <a name="l00144"></a>00144 } <span class="comment">//for y</span> <a name="l00145"></a>00145 <a name="l00146"></a>00146 <span class="comment">//find 1% and 99% precenticles</span> <a name="l00147"></a>00147 <span class="comment">//we'll stretch these values so we avoid outliers from affecting the stretch</span> <a name="l00148"></a>00148 <span class="keywordtype">int</span> sum=0; <a name="l00149"></a>00149 <span class="keywordtype">double</span> indexLow, indexHigh; <a name="l00150"></a>00150 indexLow = -1.0; indexHigh = -1.0; <a name="l00151"></a>00151 <span class="keywordflow">for</span>(i=0; i<256; i++) <a name="l00152"></a>00152 { <a name="l00153"></a>00153 sum+=grayVals[i]; <a name="l00154"></a>00154 <a name="l00155"></a>00155 <span class="comment">//if 1% not found yet and criteria met set index</span> <a name="l00156"></a>00156 <span class="keywordflow">if</span>(indexLow < 0 && <a name="l00157"></a>00157 sum >= 0.01*numPixels) <a name="l00158"></a>00158 { <a name="l00159"></a>00159 indexLow = ((double)i)/255.0; <a name="l00160"></a>00160 } <a name="l00161"></a>00161 <a name="l00162"></a>00162 <span class="comment">//if 99% not found yet and criteria met set index</span> <a name="l00163"></a>00163 <span class="keywordflow">if</span>(indexHigh < 0 && <a name="l00164"></a>00164 sum >= 0.99*numPixels) <a name="l00165"></a>00165 { <a name="l00166"></a>00166 indexHigh = ((double)i)/255.0; <a name="l00167"></a>00167 } <a name="l00168"></a>00168 } <a name="l00169"></a>00169 <a name="l00170"></a>00170 <span class="comment">//only apply scaling if indexHigh > indexLow</span> <a name="l00171"></a>00171 <span class="keywordflow">if</span>(indexHigh > indexLow) <a name="l00172"></a>00172 { <a name="l00173"></a>00173 <span class="comment">//run through all image pixels a second time, this time scaling coordinates as necessary</span> <a name="l00174"></a>00174 <span class="keywordflow">for</span>( y=0; y<<a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->height(); y++) <a name="l00175"></a>00175 { <a name="l00176"></a>00176 <span class="comment">//iterate over each selected pixel in scanline</span> <a name="l00177"></a>00177 scanLine = <a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->scanLine(y); <a name="l00178"></a>00178 <span class="keywordflow">for</span>( x=0; x<<a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a>->width(); x++) <a name="l00179"></a>00179 { <a name="l00180"></a>00180 <span class="comment">//get color coordinates and convert to 0-1 scale</span> <a name="l00181"></a>00181 rgb = ((QRgb*)scanLine+x); <a name="l00182"></a>00182 <span class="keywordtype">double</span> r = ((double)qRed(*rgb) )/255.0; <a name="l00183"></a>00183 <span class="keywordtype">double</span> g = ((double)qGreen(*rgb) )/255.0; <a name="l00184"></a>00184 <span class="keywordtype">double</span> <a class="code" href="jpegInternal_8h.html#af320905358fa78701e4cc60b6135601f">b</a> = ((double)qBlue(*rgb) )/255.0; <a name="l00185"></a>00185 <a name="l00186"></a>00186 <span class="comment">//convert to hsv</span> <a name="l00187"></a>00187 <span class="keywordtype">double</span> h,s,v; <a name="l00188"></a>00188 <a class="code" href="imageTools_8cpp.html#a7769c25727d6caedf20321d238b3828d" title="Convert a RGB color triplet to HSV.">RGBtoHSV</a>(r,g,b,&h,&s,&v); <a name="l00189"></a>00189 <a name="l00190"></a>00190 <span class="comment">//scale and clamp v</span> <a name="l00191"></a>00191 v = (v-indexLow)/(indexHigh-indexLow); <a name="l00192"></a>00192 <a name="l00193"></a>00193 <span class="comment">//convert adjusted color back to rgb colorspace and clamp</span> <a name="l00194"></a>00194 <a class="code" href="imageTools_8cpp.html#aa4ea508b635b1a7648bb5834132d4681" title="Convert a HSV color triplet to RGB.">HSVtoRGB</a>( &r,&g,&b, h,s,v); <a name="l00195"></a>00195 <span class="keywordtype">int</span> rp = (int) QMIN( QMAX((r*255), 0), 255 ); <a name="l00196"></a>00196 <span class="keywordtype">int</span> gp = (int) QMIN( QMAX((g*255), 0), 255 ); <a name="l00197"></a>00197 <span class="keywordtype">int</span> bp = (int) QMIN( QMAX((b*255), 0), 255 ); <a name="l00198"></a>00198 <a name="l00199"></a>00199 <span class="comment">//set adjusted color value</span> <a name="l00200"></a>00200 *rgb = qRgb(rp,gp,bp); <a name="l00201"></a>00201 <a name="l00202"></a>00202 <span class="comment">//update status bar if significant progress has been made since last update</span> <a name="l00203"></a>00203 <span class="keywordflow">if</span>(status) <a name="l00204"></a>00204 { <a name="l00205"></a>00205 newProgress++; <a name="l00206"></a>00206 <span class="keywordflow">if</span>(newProgress >= updateIncrement) <a name="l00207"></a>00207 { <a name="l00208"></a>00208 newProgress = 0; <a name="l00209"></a>00209 status-><a class="code" href="classStatusWidget.html#ade18735223ae40506c32c96b9c9c5476" title="Updates the progress bar by one step.">incrementProgress</a>(); <a name="l00210"></a>00210 qApp->processEvents(); <a name="l00211"></a>00211 } <a name="l00212"></a>00212 } <a name="l00213"></a>00213 <a name="l00214"></a>00214 } <span class="comment">//for x</span> <a name="l00215"></a>00215 } <span class="comment">//for y</span> <a name="l00216"></a>00216 } <span class="comment">//if scaling should be preforemd</span> <a name="l00217"></a>00217 <a name="l00218"></a>00218 <span class="comment">//remove status bar</span> <a name="l00219"></a>00219 <span class="keywordflow">if</span>(status) <a name="l00220"></a>00220 { <a name="l00221"></a>00221 status-><a class="code" href="classStatusWidget.html#a02084869ff1c15dab4bc922a49b31808" title="Update message.">setStatus</a>( <span class="stringliteral">""</span> ); <a name="l00222"></a>00222 qApp->processEvents(); <a name="l00223"></a>00223 } <a name="l00224"></a>00224 } </pre></div></p> </div> </div> <a class="anchor" id="a5a7a57ce540b35b0987153951f45a398"></a><!-- doxytag: member="contrast.cpp::enhanceImageContrast" ref="a5a7a57ce540b35b0987153951f45a398" args="(QString filename, StatusWidget *status)" --> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">QImage* enhanceImageContrast </td> <td>(</td> <td class="paramtype">QString </td> <td class="paramname"> <em>filename</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="classStatusWidget.html">StatusWidget</a> * </td> <td class="paramname"> <em>status</em></td><td> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td><td></td> </tr> </table> </div> <div class="memdoc"> <p>Definition at line <a class="el" href="contrast_8cpp_source.html#l00085">85</a> of file <a class="el" href="contrast_8cpp_source.html">contrast.cpp</a>.</p> <p>References <a class="el" href="redEye__internal_8h_source.html#l00037">editedImage</a>, and <a class="el" href="contrast_8cpp_source.html#l00085">enhanceImageContrast()</a>.</p> <p>Referenced by <a class="el" href="edgeDetect_8cpp_source.html#l00859">EdgeDetect::constructEdgeImage()</a>, <a class="el" href="editingInterface_8cpp_source.html#l00650">EditingInterface::enhanceContrast()</a>, and <a class="el" href="contrast_8cpp_source.html#l00085">enhanceImageContrast()</a>.</p> <p><div class="fragment"><pre class="fragment"><a name="l00086"></a>00086 { <a name="l00087"></a>00087 <span class="comment">//load original image</span> <a name="l00088"></a>00088 QImage* <a class="code" href="redEye__internal_8h.html#a63116a8b94b4ed0e99ddcb7f6f3bd919">editedImage</a> = <span class="keyword">new</span> QImage( filename ); <a name="l00089"></a>00089 <a name="l00090"></a>00090 <span class="comment">//convert to 32-bit depth if necessary</span> <a name="l00091"></a>00091 <span class="keywordflow">if</span>( editedImage->depth() < 32 ) <a name="l00092"></a>00092 { <a name="l00093"></a>00093 QImage* tmp = editedImage; <a name="l00094"></a>00094 editedImage = <span class="keyword">new</span> QImage( tmp->convertDepth( 32, Qt::AutoColor ) ); <a name="l00095"></a>00095 <span class="keyword">delete</span> tmp; tmp=NULL; <a name="l00096"></a>00096 } <a name="l00097"></a>00097 <a name="l00098"></a>00098 <span class="comment">//enhance contrast</span> <a name="l00099"></a>00099 <a class="code" href="contrast_8cpp.html#a5a7a57ce540b35b0987153951f45a398">enhanceImageContrast</a>( editedImage, status ); <a name="l00100"></a>00100 <a name="l00101"></a>00101 <span class="comment">//return pointer to edited image</span> <a name="l00102"></a>00102 <span class="keywordflow">return</span> editedImage; <a name="l00103"></a>00103 } </pre></div></p> </div> </div> </div> <hr size="1"/><address style="text-align: right;"><small>Generated by <a href="http://www.doxygen.org/index.html"> <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address> </body> </html>