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Error undefined variable "cv" - Matlab

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System information (version) OpenCV => 2.4.13 Operating System / Platform => Windows 10 64-Bit Compiler => Visual Studio 2012 Detailed description I am trying to run a Matlab code using some OpenCV commands but I keep getting this error. What should I do? I already tried to install the OpenCV as in its guide following the 5 steps for Pre-built Libraries as follows but didn't work, I am probably missing or misunderstanding something. I would appreciate your help. Thank you guys in advance http://docs.opencv.org/2.4/doc/tutorials/introduction/windows_install/windows_install.html#windows-installation ![image description](/upfiles/14751530882727895.png) ![image description](/upfiles/14751530968467683.png) ![image description](/upfiles/14751531026455934.png) Follows the Matlab error: Undefined variable "cv" or class "cv.cvtColor". Error in face_d_t_new (line 35) gr = cv.cvtColor(videoFrame, 'RGB2GRAY'); Error in HR (line 21) [pos, distance] = face_d_t_new(vid_name, fr, s);

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