This guide describes how to install and configure Open CV 2.3.1 and its dependencies on Ubuntu.
It is a compilation of my notes recorded during dozens of Open CV installs on several different systems.
Please see the latest blog to install Open CV 3 on mac OS here !
Notes : Consider following suggestions before you start installing Open CV on your Mac 1.
The fourth argument, called The final argument is a void pointer that can be used to have Open CV pass in any additional information in the form of a pointer to whatever kind of structure you need.
A common situation in which you will want to use the The first argument is the name of the window to which the callback will be attached.
This allows our user to leisurely peruse the image before ultimately exiting the program by hitting Escape. The difference between these two options would be more apparent if we were displaying a video, in which case we would want to take an action (i.e., display the next frame) if the user supplied no keystroke.
Note that, if you do not start a separate window thread, Open CV can react to user interface actions only when it is explicitly given time to do so (this happens when your program invokes we tell Open CV to wait 100 ms for a key stroke.
Here, we must be able to tell the function to be used as a callback exactly what kind of event occurred and where it occurred.
The function must also be told if the user was pressing such keys as Shift or Alt when the mouse event occurred.
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