OpenCV is an open source computer graphics and image Library developed in C/s + +, very powerful and complete in research materials. The focus of this article is to describe how to use PHP to invoke local functionality. Face detection technology is just a branch of OPENCV application.
1. Installation
Compiled from the source code into a dynamic so file.
1.1. Installing OpenCV (OpenCV 1.0.0)
Download Address: http://sourceforge.net/project/showfiles.php?group_id=22870&package_id=16948
#tar Xvzf opencv-1.0.0.tar.gz
#cd opencv-1.0.0
#./configure
#make
#make Install
#make Check (checks whether the installation is all correct)
Tip: Do not specify the installation path, or you will not find the path to the OPENCV after compiling facedetect.
1.2 Installing Facedetect
Download Address http://www.xarg.org/download/facedetect-1.0.0.tar.gz
#tar XZVF facedetect-1.0.0.tar.gz
#cd facedetect-1.0.0
#phpize &&./configure && make && make install
After compiling, you will be prompted where the facedetect.so file is located.
Finally confirm to join in php.ini
extension=facedetect.so, restart Apache.
2. Function usage
Check for Facedetect this module in Phpinfo ().
Remove all XML files from OpenCV source code/data/haarcascades/in PHP's execution directory
Check how many face shapes you have.
Var_dump (Face_count (' Party.jpeg ', Haarcascade_frontalface_alt.xml '));
Returns the position parameter of the face shape in the picture, multiple returns the array
$arr = Face_detect (' party.jpeg ', Haarcascade_frontalface_alt2.xml ');
Print_r ($arr);
3. Application
The combination of Imagick can be used to make pictures. Because Face_detect only returns a rectangle parameter, it contains the x, y coordinates, and the w,h length-width parameter. Here is one of my application demo
Copy CodeThe code is as follows:
if ($_files) {
$img = $_files[' pic ' [' tmp_name '];
$arr = Face_detect ($img, ' haarcascade_frontalface_alt2.xml ');
$arr 1 = face_detect ($img, ' haarcascade_frontalface_alt_tree.xml ');
if (Is_array ($arr 1)) $all =array_merge ($arr, $arr 1);
else $all = $arr;
$im = new Imagick ($img);
$draw =new Imagickdraw ();
$borderColor = new Imagickpixel (' Red ');
$draw->setfillalpha (0.0);
$draw->setstrokecolor ($borderColor);
$draw->setstrokewidth (1);
if (Is_array ($all)) {
foreach ($all as $v) {
$im _cl = $im->clone ();
$im _cl->cropimage ($v [' W '], $v [' H '], $v [' X '], $v [' Y ']);
$im _cl->swirlimage (60);
$im->compositeimage ($im _cl, Imagick::composite_over, $v [' X '], $v [' Y ']);
$draw->rectangle ($v [' X '], $v [' Y '], $v [' x ']+ $v [' W '], $v [' Y ']+ $v [' H ']);
$im->drawimage ($draw);
}
}
Header ("Content-type:image/png");
Echo $im;
}else{
?>
}
?>
Resources:
http://www.xarg.org/2008/07/face-detection-with-php/
http://www.opencv.org.cn/index.php/Home
Http://www.cs.iit.edu/~agam/cs512/lect-notes/opencv-intro/index.html
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