Egg drop contest soon @fim.uni-passau

• vlc is not in the "Mac App Store" - you have to download it manually ...
• you have to reboot Mac OS X after i'Life installation
• you cannot activate "File Vault" when your home directory is on a case-sensitive Mac OS X extended partition
  moreover you cannot convert to case-insensitive partition ... (https://discussions.apple.com/thread/1578457?start=0&tstart=0)
• best thing: to use only one display you have to:

1. activate mirror mode for displays
2. close your macbook
3. wait until macbook is in standby
4. press a key on usb keyboard
5. login (screen lock)
6. correct screen resolution

steps 2-5 have to be done after every power-on

Impression #gpn11

it detects faces and puts trollface there
before:

trollface_before

after:

trollface_after

Zeilennummern

    1 #include <stdlib.h>
    2 #include <stdio.h>
    3 #include <math.h>
    4 #include <cv.h>
    5 #include <highgui.h>
    6 
    7 void draw(IplImage *img, int x, int y, int width, int height)
    8 {
    9   IplImage* troll = cvLoadImage("trollface.png", CV_LOAD_IMAGE_COLOR);
   10   IplImage* scale_troll = cvCreateImage(cvSize(width, height), img->depth,
   11                           img->nChannels);
   12 
   13   cvSetImageROI(img, cvRect(x,y,scale_troll->width,scale_troll->height));
   14   cvResize(troll, scale_troll, CV_INTER_LINEAR);
   15   cvAddWeighted(img, 0.0, scale_troll, 1.0, 0.5, img);
   16   cvResetImageROI(img);
   17 
   18   cvReleaseImage(&troll);
   19   cvReleaseImage(&scale_troll);
   20 
   21 }
   22 
   23 int main(int argc, char *argv[])
   24 {
   25   int i;
   26   double scale;
   27   IplImage* img;
   28   CvHaarClassifierCascade* cascade;
   29   CvSeq* faces;
   30   CvRect* r;
   31   CvMemStorage* storage = cvCreateMemStorage(0);
   32 
   33   cvClearMemStorage(storage);
   34 
   35   if (argc<2)
   36     {
   37       printf("Usage: main <image-file-name>\n\7");
   38       exit(0);
   39     }
   40 
   41   cascade = (CvHaarClassifierCascade*)cvLoad(
   42             "/usr/share/opencv/haarcascades/haarcascade_frontalface_default.
   43             xml", 0, 0, 0 );
   44   //cascade = (CvHaarClassifierCascade*)cvLoad(
   45               "/usr/share/opencv/haarcascades/haarcascade_frontalface_alt.
   46               xml", 0, 0, 0 );
   47 
   48 
   49   img=cvLoadImage(argv[1], CV_LOAD_IMAGE_COLOR);
   50   if (!img)
   51     {
   52       printf("Could not load image file: %s\n",argv[1]);
   53       exit(-1);
   54     }
   55 
   56   printf("Processing a %dx%d image with %d channels\n",img->width,img->
   57          height,img->nChannels);
   58 
   59   cvNamedWindow("mainWin", CV_WINDOW_AUTOSIZE);
   60   //cvMoveWindow("mainWin", 100, 100);
   61 
   62   if (!cascade)
   63     fprintf(stderr, "ERROR, no cascade loaded :(\n");
   64 
   65   scale = 1+((43e-8)*img->width*img->height);
   66   printf("scale: %f\n", scale);
   67 
   68   faces = cvHaarDetectObjects( img, cascade, storage, scale, 3,
   69           CV_HAAR_DO_CANNY_PRUNING, cvSize(40,40), cvSize(50,50) );
   70   //faces = cvHaarDetectObjects( img, cascade, storage, scale, 3,
   71             CV_HAAR_SCALE_IMAGE, cvSize(40,40), cvSize(50,50) );
   72   for ( i = 0; i < (faces ? faces->total : 0); i++ )
   73     {
   74       cvShowImage("mainWin", img );
   75       cvWaitKey(0);
   76 
   77       printf("face\n");
   78       r = (CvRect*)cvGetSeqElem(faces, i);
   79       //cvRectangle(img, cvPoint( r->x, r->y ), cvPoint( r->x + r->width, r-
   80                     >y + r->height ), colors[i%8], 5, 8, 0);
   81       draw(img, r->x, r->y, r->width, r->height);
   82     }
   83   cvShowImage("mainWin", img );
   84 
   85   cvWaitKey(0);
   86   cvSaveImage("Result.jpg", img, 0);
   87 
   88   cvReleaseImage(&img);
   89   cvDestroyWindow("mainWin");
   90   return 0;
   91 }

Makefile:

gcc troll.c -o troll -lm -lopencv_highgui -lopencv_objdetect -I /usr/include/opencv/ -Wall -g

Club mate and ice-t now available in passau diagonally opposite wiwi faculty

Imagine you have faved a lot of pics on flickr and now want to download them; of course you could do that easy in perl - BUT you can do this easy in C, too For this purpose we use flickcurl; it helps us a lot (especially with the authentication - as you know I hate complicated authentication methods - especially ntlm!)

Some Presteps:

1. get api key and shared secret: http://librdf.org/flickcurl/api/flickcurl-auth-register.html
2. get authentication token: http://librdf.org/flickcurl/api/flickcurl-auth-authenticate.html

Zeilennummern

    1 #include <stdio.h>
    2 #include <flickcurl.h>
    3 
    4 #define USERNSS "63169079@N05"
    5 #define MAX_PAGES 500
    6 
    7 int main()
    8 {
    9   int i, page;
   10   char *url;
   11 
   12   flickcurl *fc;
   13   flickcurl_photos_list *pl;
   14   flickcurl_photos_list_params list_params;
   15 
   16   flickcurl_init();
   17 
   18   fc = flickcurl_new();
   19 
   20   flickcurl_set_api_key(fc, "...");
   21   flickcurl_set_shared_secret(fc, "...");
   22   flickcurl_set_auth_token(fc, "...");
   23 
   24   flickcurl_photos_list_params_init(&list_params);
   25   list_params.per_page = 10;
   26   list_params.page = 0;
   27   for (page = 0; page < MAX_PAGES; page++)
   28     {
   29       printf("page: %d\n", page);
   30       list_params.page = page;
   31 
   32       list_params.extras = "original_format";
   33       pl = flickcurl_favorites_getList_params(fc, USERNSS, &list_params);
   34       for (i = 1; i < pl->photos_count; ++i)
   35         {
   36           printf("  Result #%d has ID %s  ", i, pl->photos[i]->id);
   37           url = flickcurl_photo_as_source_uri(pl->photos[i], 'b');
   38           printf(" | url: %s\n", url);
   39           free(url);
   40         }
   41       flickcurl_free_photos_list(pl);
   42       if (pl->photos_count == 0)
   43         break;
   44     }
   45 
   46   flickcurl_free(fc);
   47   flickcurl_finish();
   48 }

Insert correctly the values you got via presteps:
Zeilennummern

    1 flickcurl_set_api_key(fc, "...");
    2 flickcurl_set_shared_secret(fc, "...");
    3 flickcurl_set_auth_token(fc, "...");

you can find these values in ~/.flickcurl.

You can find out your correctly USERNSS when you go to your flickr-favorites; now look at the URL (e.g. http://www.flickr.com/photos/63169079@N05/favorites/)

Now compile:
 gcc `flickcurl-config --cflags --libs` download_favs.c  -Wall -g

P.S.: explore flickr via pandas: http://www.flickr.com/explore/panda

Priest? Im a discordian pope!!