Disable Key Presses if Quiet Mode Enabled

Enables running without OpenCV calling on GTK, which you do not installed if running in a non-interactive manner. Perhaps better solution exist if "interactive" command line was added.

exe/FeatureExtraction/FeatureExtraction.cpp

@@ -2,7 +2,7 @@
 // Copyright (C) 2016, Carnegie Mellon University and University of Cambridge,
 // all rights reserved.
 //
-// THIS SOFTWARE IS PROVIDED “AS IS” FOR ACADEMIC USE ONLY AND ANY EXPRESS
+// THIS SOFTWARE IS PROVIDED “AS IS” FOR ACADEMIC USE ONLY AND ANY EXPRESS
 // OR IMPLIED WARRANTIES WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
@@ -15,13 +15,13 @@
 // POSSIBILITY OF SUCH DAMAGE.
 //
 // Notwithstanding the license granted herein, Licensee acknowledges that certain components
-// of the Software may be covered by so-called “open source” software licenses (“Open Source
+// of the Software may be covered by so-called “open source” software licenses (“Open Source
-// Components”), which means any software licenses approved as open source licenses by the
+// Components”), which means any software licenses approved as open source licenses by the
 // Open Source Initiative or any substantially similar licenses, including without limitation any
 // license that, as a condition of distribution of the software licensed under such license,
 // requires that the distributor make the software available in source code format. Licensor shall
 // provide a list of Open Source Components for a particular version of the Software upon
-// Licensee’s request. Licensee will comply with the applicable terms of such licenses and to
+// Licensee’s request. Licensee will comply with the applicable terms of such licenses and to
 // the extent required by the licenses covering Open Source Components, the terms of such
 // licenses will apply in lieu of the terms of this Agreement. To the extent the terms of the
 // licenses applicable to Open Source Components prohibit any of the restrictions in this
@@ -38,20 +38,20 @@
 //       reports and manuals, must cite at least one of the following works:
 //
 //       OpenFace: an open source facial behavior analysis toolkit
-//       Tadas Baltrušaitis, Peter Robinson, and Louis-Philippe Morency
+//       Tadas Baltrušaitis, Peter Robinson, and Louis-Philippe Morency
 //       in IEEE Winter Conference on Applications of Computer Vision, 2016  
 //
 //       Rendering of Eyes for Eye-Shape Registration and Gaze Estimation
-//       Erroll Wood, Tadas Baltrušaitis, Xucong Zhang, Yusuke Sugano, Peter Robinson, and Andreas Bulling 
+//       Erroll Wood, Tadas Baltrušaitis, Xucong Zhang, Yusuke Sugano, Peter Robinson, and Andreas Bulling 
 //       in IEEE International. Conference on Computer Vision (ICCV),  2015 
 //
 //       Cross-dataset learning and person-speci?c normalisation for automatic Action Unit detection
-//       Tadas Baltrušaitis, Marwa Mahmoud, and Peter Robinson 
+//       Tadas Baltrušaitis, Marwa Mahmoud, and Peter Robinson 
 //       in Facial Expression Recognition and Analysis Challenge, 
 //       IEEE International Conference on Automatic Face and Gesture Recognition, 2015 
 //
 //       Constrained Local Neural Fields for robust facial landmark detection in the wild.
-//       Tadas Baltrušaitis, Peter Robinson, and Louis-Philippe Morency. 
+//       Tadas Baltrušaitis, Peter Robinson, and Louis-Philippe Morency. 
 //       in IEEE Int. Conference on Computer Vision Workshops, 300 Faces in-the-Wild Challenge, 2013.    
 //
 ///////////////////////////////////////////////////////////////////////////////
@@ -680,6 +680,9 @@ int main (int argc, char **argv)
 					captured_image = cv::Mat();
 				}
 			}
+			
+			if (!det_parameters.quiet_mode)
+			{
 				// detect key presses
 				char character_press = cv::waitKey(1);
 			
@@ -693,6 +696,7 @@ int main (int argc, char **argv)
 				{
 					return(0);
 				}
+			}
 			
 			// Update the frame count
 			frame_count++;