Meaning of trackbar

the function cvCreateTrackbar create the trackbar(slider) with the specif开发者_运维知识库ied name and range,,, my question, what is the trackbar??

A trackbar is a slider GUI component:

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

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