MATLAB: How to find the direction of the moving object in a sequence of frames

direction

how to find the direction of the moving object in a sequence of frames,how to find whether it is moving in the east, west ,north or south direction

Best Answer

This is not possible unless you either have external information about which direction is which in the image, or you have information inside the image that gives you information about the directions.

Remember to take into account that a vector in any one 3-space direction changes between east/west and north/south depending which side of the Earth it is originating from. And watch out for images taken from "below" your assumed coordinate system.

Related Solutions

MATLAB: Magnitude and direction from north and east components

Hi Mithun,

You can think of North and East as your X and Y. As you have taken north as reference so use below formulas to calculate magnitude and angle.

Magnitude = sqrt(North^2+East^2);
Theta = atan((-East)/North);

I am using -East because East is 90 degree closewise to North and atan calculates angles in counter clockwise directions from reference.

Thanks,

Deepak

MATLAB: Curvature direction

Is the circle actually part of an image, or do you have the coordinates of the circle? If you have the coordinates, it's just a matter of calculating the sign of the cross product.

    cp = cross( [x(2)-x(1), y(2)-y(1), 0], [x(3)-x(1), y(3)-y(1), 0])
    direction = sign(cp);  %+1 if counterclockwise, -1 if clockwise

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Related Solutions

MATLAB: Magnitude and direction from north and east components

MATLAB: Curvature direction

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