How i can determine the direction of the pixel??

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sassi nizar
sassi nizar 2015-10-25
评论： sassi nizar 2015-10-25
I am using lucas & kanade method to calculate the optical flow, I need that to classify the pixels into right,left,up and down.

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回答（1 个）

Walter Roberson
Walter Roberson 2015-10-25
Look at whether abs(delta_x) > abs(delta_y) to determine whether you are dealing with left/right or with up/down . Then within each group, look at the sign of the controlling change to determine which of the two directions it is.
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sassi nizar
sassi nizar 2015-10-25
I have the two derivatives matrix fx and fy, i can use the tan inverse (fy/fx), and this give me a value in 0-360... my problem, how i can classify this value to right,left,up or down. exactly now what i need it is the inetrval how i can i define it.

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