X-Git-Url: http://challenge-bot.com/repos/?p=challenge-bot;a=blobdiff_plain;f=bbb%2Fopencv-hello-world%2Fopencv-hello-world.cpp;fp=bbb%2Fopencv-hello-world%2Fopencv-hello-world.cpp;h=55d58274ea17d2eea704dc4db1526202ccd2a5a8;hp=02fea3ea1c374657dd72e46cc28190b009c4076e;hb=d3b4165227672786b91d4850eb198b3524d7f49f;hpb=ba250b4c27713e8e040c0a28ecfbf8527bbe4d5c

diff --git a/bbb/opencv-hello-world/opencv-hello-world.cpp b/bbb/opencv-hello-world/opencv-hello-world.cpp
index 02fea3e..55d5827 100644
--- a/bbb/opencv-hello-world/opencv-hello-world.cpp
+++ b/bbb/opencv-hello-world/opencv-hello-world.cpp
@@ -13,13 +13,15 @@ using namespace cv;
 using namespace std;
 
 int main(int argc, char** argv) {
-  VideoCapture camera;
-  camera.open(0);
-  Mat edges;
-  Mat frame;
+  if (argc < 2) {
+    cout << "supply a video device index." << endl;
+    cout << "probably 0 for beaglebone, 1 for laptop" << endl;
+    exit(0); }
+  VideoCapture camera(atoi(argv[1]));
   if(!camera.isOpened()) {
     cout << "not opened :( that's bad" << endl;
     exit(-1); }
+  Mat frame;
   camera >> frame;
   Mat grey_image;
   cvtColor(frame, grey_image, CV_BGR2GRAY);