From afbec6a10b1e718fed134f61295e92f1e94770d4 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sat, 24 Aug 2013 22:33:52 +0200
Subject: Workaround camera frame-retrieval badness

---
 ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

(limited to 'ftnoir_tracker_aruco')

diff --git a/ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp b/ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp
index 152c1e32..6fff39d3 100644
--- a/ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp
+++ b/ftnoir_tracker_aruco/ftnoir_tracker_aruco.cpp
@@ -15,6 +15,7 @@
 #include <opencv2/opencv.hpp>
 #include <opencv/highgui.h>
 #include <vector>
+#include <cstdio>
 
 #if defined(_WIN32) || defined(__WIN32)
 #include <dshow.h>
@@ -185,12 +186,19 @@ void Tracker::run()
     aruco::MarkerDetector detector;
     detector.setDesiredSpeed(3);
     detector.setThresholdParams(11, 5);
-    cv::Mat color, grayscale, rvec, tvec;
+    cv::Mat color, color_, grayscale, rvec, tvec;
+    
+    if (!camera.isOpened())
+    {
+        fprintf(stderr, "aruco tracker: can't open camera\n");
+        return;
+    }
   
     while (!stop)
     {
-        if (!camera.read(color))
-            break;
+        if (!camera.read(color_))
+            continue;
+        color_.copyTo(color);
         cv::cvtColor(color, grayscale, cv::COLOR_BGR2GRAY);
         const float focal_length_w = 0.5 * grayscale.cols / tan(0.5 * fov * HT_PI / 180);
         const float focal_length_h = 0.5 * grayscale.rows / tan(0.5 * fov * grayscale.rows / grayscale.cols * HT_PI / 180.0);
-- 
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