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There are 3 methods , to access MAT elements 1-Pointer method (effecint in time , but risky in handling piointers errors) 2-Iterator method 3-On the fly method also there is LUT which give best time because Opencv optmization for multithreading and multicore you can find examples for every method in the following link and h

There are 3 methods , to access MAT elements 1-Pointer method (effecint in time , but risky in handling piointers errors) 2-Iterator method method (the safe mode) 3-On the fly method also there is LUT which give best time because Opencv optmization for multithreading and multicore you can find examples for every method in the following link and h[link text](http://docs.opencv.org/2.4/doc/tutorials/core/how_to_scan_images/how_to_scan_images.html)

link text