modified facedetect to properly display very oblong objects and optionally flip image horizontally (for profile face detection). Added LBP cascades by Attila Novak for profile face detection and silverware detection (those are results of GSoC 2012)

samples/c/facedetect.cpp

@@ -3,6 +3,7 @@
 #include "opencv2/imgproc/imgproc.hpp"
 
 #include <iostream>
+#include <iterator>
 #include <stdio.h>
 
 using namespace std;
@@ -11,36 +12,41 @@ using namespace cv;
 static void help()
 {
     cout << "\nThis program demonstrates the cascade recognizer. Now you can use Haar or LBP features.\n"
-            "This classifier can recognize many ~rigid objects, it's most known use is for faces.\n"
+            "This classifier can recognize many kinds of rigid objects, once the appropriate classifier is trained.\n"
+            "It's most known use is for faces.\n"
             "Usage:\n"
             "./facedetect [--cascade=<cascade_path> this is the primary trained classifier such as frontal face]\n"
                "   [--nested-cascade[=nested_cascade_path this an optional secondary classifier such as eyes]]\n"
-               "   [--scale=<image scale greater or equal to 1, try 1.3 for example>\n"
+               "   [--scale=<image scale greater or equal to 1, try 1.3 for example>]\n"
+               "   [--try-flip]\n"
                "   [filename|camera_index]\n\n"
             "see facedetect.cmd for one call:\n"
-            "./facedetect --cascade=\"../../data/haarcascades/haarcascade_frontalface_alt.xml\" --nested-cascade=\"../../data/haarcascades/haarcascade_eye.xml\" --scale=1.3 \n"
-            "Hit any key to quit.\n"
-            "Using OpenCV version " << CV_VERSION << "\n" << endl;
+            "./facedetect --cascade=\"../../data/haarcascades/haarcascade_frontalface_alt.xml\" --nested-cascade=\"../../data/haarcascades/haarcascade_eye.xml\" --scale=1.3\n\n"
+            "During execution:\n\tHit any key to quit.\n"
+            "\tUsing OpenCV version " << CV_VERSION << "\n" << endl;
 }
 
-void detectAndDraw( Mat& img,
-                   CascadeClassifier& cascade, CascadeClassifier& nestedCascade,
-                   double scale);
+void detectAndDraw( Mat& img, CascadeClassifier& cascade,
+                    CascadeClassifier& nestedCascade,
+                    double scale, bool tryflip );
 
-String cascadeName = "../../data/haarcascades/haarcascade_frontalface_alt.xml";
-String nestedCascadeName = "../../data/haarcascades/haarcascade_eye_tree_eyeglasses.xml";
+string cascadeName = "../../data/haarcascades/haarcascade_frontalface_alt.xml";
+string nestedCascadeName = "../../data/haarcascades/haarcascade_eye_tree_eyeglasses.xml";
 
 int main( int argc, const char** argv )
 {
     CvCapture* capture = 0;
     Mat frame, frameCopy, image;
-    const String scaleOpt = "--scale=";
+    const string scaleOpt = "--scale=";
     size_t scaleOptLen = scaleOpt.length();
-    const String cascadeOpt = "--cascade=";
+    const string cascadeOpt = "--cascade=";
     size_t cascadeOptLen = cascadeOpt.length();
-    const String nestedCascadeOpt = "--nested-cascade";
+    const string nestedCascadeOpt = "--nested-cascade";
     size_t nestedCascadeOptLen = nestedCascadeOpt.length();
-    String inputName;
+    const string tryFlipOpt = "--try-flip";
+    size_t tryFlipOptLen = tryFlipOpt.length();
+    string inputName;
+    bool tryflip = false;
 
     help();
 
@@ -68,6 +74,11 @@ int main( int argc, const char** argv )
                 scale = 1;
             cout << " from which we read scale = " << scale << endl;
         }
+        else if( tryFlipOpt.compare( 0, tryFlipOptLen, argv[i], tryFlipOptLen ) == 0 )
+        {
+            tryflip = true;
+            cout << " will try to flip image horizontally to detect assymetric objects\n";
+        }
         else if( argv[i][0] == '-' )
         {
             cerr << "WARNING: Unknown option %s" << argv[i] << endl;
@@ -79,10 +90,7 @@ int main( int argc, const char** argv )
     if( !cascade.load( cascadeName ) )
     {
         cerr << "ERROR: Could not load classifier cascade" << endl;
-        cerr << "Usage: facedetect [--cascade=<cascade_path>]\n"
-            "   [--nested-cascade[=nested_cascade_path]]\n"
-            "   [--scale[=<image scale>\n"
-            "   [filename|camera_index]\n" << endl ;
+        help();
         return -1;
     }
 
@@ -123,7 +131,7 @@ int main( int argc, const char** argv )
             else
                 flip( frame, frameCopy, 0 );
 
-            detectAndDraw( frameCopy, cascade, nestedCascade, scale );
+            detectAndDraw( frameCopy, cascade, nestedCascade, scale, tryflip );
 
             if( waitKey( 10 ) >= 0 )
                 goto _cleanup_;
@@ -139,7 +147,7 @@ _cleanup_:
         cout << "In image read" << endl;
         if( !image.empty() )
         {
-            detectAndDraw( image, cascade, nestedCascade, scale );
+            detectAndDraw( image, cascade, nestedCascade, scale, tryflip );
             waitKey(0);
         }
         else if( !inputName.empty() )
@@ -160,7 +168,7 @@ _cleanup_:
                     image = imread( buf, 1 );
                     if( !image.empty() )
                     {
-                        detectAndDraw( image, cascade, nestedCascade, scale );
+                        detectAndDraw( image, cascade, nestedCascade, scale, tryflip );
                         c = waitKey(0);
                         if( c == 27 || c == 'q' || c == 'Q' )
                             break;
@@ -180,13 +188,13 @@ _cleanup_:
     return 0;
 }
 
-void detectAndDraw( Mat& img,
-                   CascadeClassifier& cascade, CascadeClassifier& nestedCascade,
-                   double scale)
+void detectAndDraw( Mat& img, CascadeClassifier& cascade,
+                    CascadeClassifier& nestedCascade,
+                    double scale, bool tryflip )
 {
     int i = 0;
     double t = 0;
-    vector<Rect> faces;
+    vector<Rect> faces, faces2;
     const static Scalar colors[] =  { CV_RGB(0,0,255),
         CV_RGB(0,128,255),
         CV_RGB(0,255,255),
@@ -209,6 +217,21 @@ void detectAndDraw( Mat& img,
         |CV_HAAR_SCALE_IMAGE
         ,
         Size(30, 30) );
+    if( tryflip )
+    {
+        flip(smallImg, smallImg, 1);
+        cascade.detectMultiScale( smallImg, faces2,
+                                 1.1, 2, 0
+                                 //|CV_HAAR_FIND_BIGGEST_OBJECT
+                                 //|CV_HAAR_DO_ROUGH_SEARCH
+                                 |CV_HAAR_SCALE_IMAGE
+                                 ,
+                                 Size(30, 30) );
+        for( vector<Rect>::const_iterator r = faces2.begin(); r != faces2.end(); r++ )
+        {
+            faces.push_back(Rect(smallImg.cols - r->x - r->width, r->y, r->width, r->height));
+        }
+    }
     t = (double)cvGetTickCount() - t;
     printf( "detection time = %g ms\n", t/((double)cvGetTickFrequency()*1000.) );
     for( vector<Rect>::const_iterator r = faces.begin(); r != faces.end(); r++, i++ )
@@ -218,10 +241,19 @@ void detectAndDraw( Mat& img,
         Point center;
         Scalar color = colors[i%8];
         int radius;
+        
+        double aspect_ratio = (double)r->width/r->height;
+        if( 0.75 < aspect_ratio && aspect_ratio < 1.3 )
+        {
             center.x = cvRound((r->x + r->width*0.5)*scale);
             center.y = cvRound((r->y + r->height*0.5)*scale);
             radius = cvRound((r->width + r->height)*0.25*scale);
             circle( img, center, radius, color, 3, 8, 0 );
+        }
+        else
+            rectangle( img, cvPoint(cvRound(r->x*scale), cvRound(r->y*scale)),
+                       cvPoint(cvRound((r->x + r->width-1)*scale), cvRound((r->y + r->height-1)*scale)),
+                       color, 3, 8, 0);
         if( nestedCascade.empty() )
             continue;
         smallImgROI = smallImg(*r);