finding moving direction of object?

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Abo
Abo 2014-12-15
评论： Thorsten 2014-12-16
according to diagram, i have an object in time 't' with a special position and in 't+1' in which it moved to another position, how can I find the moving direction? these spot (blue and red) are an object in two binary images (time 't' and 't+1')

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Thorsten
Thorsten 2014-12-15
If the object has position (x1, y2) at time t and (x2, y2) at time t+1, it moved in the direction (x2 - x1, y2 -y1).
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Abo
Abo 2014-12-16
thank you for your answer. please let me know how can I draw this direction and how can I define this direction as positive or negative?
Thorsten
Thorsten 2014-12-16
In general you should start a new question if you have a new question. In this case I answer it anyway: Draw an arrow from P1 to P2, google it if you don't know how to draw arrows in Matlab; and the values you get could be positive or negative... That gives you some idea how to define a direction as positive or negative :-)

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