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14

answers:

2

the function cvCreateTrackbar create the trackbar(slider) with the specified name and range,,, my question, what is the trackbar??

+2  A: 

A trackbar is a slider GUI component:

|--------------------[]---------|

You can use it to adjust some values in a specified range.

dark_charlie
A: 

Try making one yourself. This might help: http://www.aishack.in/2010/02/highgui-creating-interfaces

Utkarsh Sinha