Reza A Tabibazar. » PHP Scripts http://www.rxt7.com/log Just another weblog Fri, 21 Sep 2007 11:35:46 +0000 http://wordpress.org/?v=2.8.4 en hourly 1 Sorting images based on their Pixel Dimension. (ver 0.5) http://www.rxt7.com/log/?p=32 http://www.rxt7.com/log/?p=32#comments Sun, 16 Sep 2007 13:30:05 +0000 Administrator http://www.rxt7.com/log/?p=32 I have a lot of images and almost all of them are saved based on JPEG standard. I have tried different software to sort them based on size but none that I know can do it based on image's pixel dimension(1). JPEG compresses an image based on the color information present in the image (2). Thus, the file sizes are not a true representation of how large an image is when displayed on screen. In trying to sort out small images based on their width or height we face the challenge of sorting images which are unusually tall or wide. Hence, sorting images based on their pixel dimension is a more accurate way of sorting images into groups. I present a script in PHP that does exactly that. The code is fast enough although you need to increase the execution time in php.ini. This script is to be used as a shell script and not in a website. Here are the results I got:
Total of 1019 out of 10000 were small.
Total of 2407 out of 10000 were medium.
Total of 6574 out of 10000 were large.
406.990354061 seconds to sort images

So that is roughly 0.04 seconds for each image.

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PLAIN TEXT
PHP:
  1. /*
  2. small :
  3. 150 x 150 or smaller
  4. medium :
  5. larger than 150 x 150 and
  6. smaller than 500 x 500
  7. large :
  8. 500 x 500 or larger
  9. */
  10. function pixel_dim_sort($src_dir, $dest_dir){
  11.     $dir = $src_dir; // directory where the unsorted images are
  12.  
  13.     // $dest_dir  directory where sorted images will be stored
  14.     // in three folders small, mediam and large
  15.  
  16.     if (!file_exists($dir))
  17.     { echo "Source directory $dir does not exist! <br/>\n   "; exit;}
  18.  
  19.     if (!file_exists($dest_dir ))
  20.     mkdir($dest_dir );        // create the sorted images directory if it does not exist
  21.     $dir_small = $dest_dir  . "small/";
  22.     $dir_medium = $dest_dir  . "medium/";
  23.     $dir_large = $dest_dir  . "large/";
  24.  
  25.     $pixel_dim_small = 22500; // x <= 150*150
  26.     $pixel_dim_medium = 250000 ; //500*500<= x <150*150
  27.     $pixel_dim_large = 250000; // x> 500*500
  28.     if (!file_exists($dir_small))
  29.     mkdir($dir_small);
  30.     if (!file_exists($dir_medium))
  31.     mkdir($dir_medium);
  32.     if (!file_exists($dir_large ))
  33.     mkdir($dir_large );
  34.  
  35.     $total_count =0;
  36.     $total_small = 0;
  37.     $total_medium = 0;
  38.     $total_large = 0;
  39.     // Open a known directory, and proceed to read its contents
  40.     if (is_dir($dir)) {
  41.         if ($dh = opendir($dir)) {
  42.             while (($file = readdir($dh)) !== false) {
  43.                 if($file != '.' && $file != '..'){
  44.                     $imagehw = GetImageSize($dir. $file);
  45.                     $total_count++;
  46.                     $imgdim= $imagehw[0]*$imagehw[1];
  47.                     if( $imgdim <= $pixel_dim_small) {
  48.  
  49.                         $bool = copy($dir. $file, $dir_small . $file);
  50.                         if ($bool )  // making sure we don't delete the file which is not copied
  51.                         unlink($dir.$file);
  52.                         else {echo "copy file failed ... "; exit; }
  53.                         $total_small++;
  54.                     }
  55.                     elseif( ($imgdim> $pixel_dim_small) && ($imgdim  <= $pixel_dim_medium) ) {
  56.                         $bool = copy($dir. $file, $dir_medium . $file);
  57.                         if ($bool )
  58.                         unlink($dir.$file);
  59.                         else {echo "copy file failed ... "; exit; }
  60.                         $total_medium++;
  61.                     }
  62.                     elseif($imgdim > $pixel_dim_large) {
  63.                         $bool = copy($dir. $file, $dir_large . $file);
  64.                         if ($bool )
  65.                         unlink($dir.$file);
  66.                         else {echo "copy file failed ... "; exit; }
  67.                         $total_large++;
  68.                     }
  69.                 }
  70.             }
  71.             closedir($dh);
  72.         }
  73.     }
  74.     $total_count = $total_small + $total_medium + $total_large;
  75.     echo "Total of $total_small out of $total_count were small. <br />\n ";
  76.     echo "Total of $total_medium out of $total_count were medium. <br />\n ";
  77.     echo "Total of $total_large out of $total_count were large. <br />\n ";
  78. }
  79.  
  80. $start = time() + microtime();
  81.  
  82. pixel_dim_sort("f:/0000/new/", "f:/0000/sorted2/");
  83.  
  84. echo time() + microtime() - $start, ' seconds to sort images.';

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]]> http://www.rxt7.com/log/?feed=rss2&p=32 0 Quick and dirty SETI@home stats http://www.rxt7.com/log/?p=27 http://www.rxt7.com/log/?p=27#comments Mon, 15 Jan 2007 10:01:06 +0000 Administrator http://www.rxt7.com/log/?p=27 I have used the WAP interface for getting the stats, which are placed in an array and you can choose what to display on your own home page. All you need is to change the id number in the URL and you are set to go!


<?php
$stat = file_get_contents("http://setiathome.berkeley.edu/userw.php?id=59935") ;
$stat = str_replace("<br/>", "|", $stat);
$stat = strip_tags($stat);
$stats = explode("|", $stat);
/*
[0] => SETI@home 
[1] => Account Data  [2] => for Tabibazar 
[3] => Time: 15 Jan 2007 01:54:12 UTC 
[4] => User TotCred: 4,945.62 
[5] => User AvgCred: 0.16 
[7] => Team: Spread Firefox 
[8] => Team TotCred: 7,841,248.97 
[9] => Team AvgCred: 8,265.01
*/
echo $stats[4];
?>

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]]> http://www.rxt7.com/log/?feed=rss2&p=27 0 Firefox download counter using XSLT and php http://www.rxt7.com/log/?p=15 http://www.rxt7.com/log/?p=15#comments Wed, 17 May 2006 10:45:37 +0000 Administrator http://www.pixelcutter.com/log/?p=15 Here is a quick script to get the total Firefox downloads from its RSS feed using XSLT with php 4.4.x and 5.x:

PHP 4 test script
PHP 5 test script


PHP source code


XSLT source code

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]]> http://www.rxt7.com/log/?feed=rss2&p=15 0 Embedding Jpeg in SVG http://www.rxt7.com/log/?p=3 http://www.rxt7.com/log/?p=3#comments Mon, 26 Sep 2005 11:12:34 +0000 Administrator http://www.pixelcutter.com/log/?p=3 This php script will encode a jpeg image into a SVG object. Code is two parts one includes header info for embeding the script into a html document, the other part outputs the resulting svg to a file.
Input: path and name of the input image path and name of the output file, script should have permission to write.
Assumptions: well formed images and file names.


source code

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]]> http://www.rxt7.com/log/?feed=rss2&p=3 0 Total Firefox download! http://www.rxt7.com/log/?p=2 http://www.rxt7.com/log/?p=2#comments Thu, 22 Sep 2005 12:48:13 +0000 Administrator http://www.pixelcutter.com/log/?p=2 ]]> Here is a quick script to get the total Firefox downloads from it rss feed:
include("../files/fire.php");
?>
PHP 4 test script
PHP 5 test script


source code

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]]> http://www.rxt7.com/log/?feed=rss2&p=2 5