I have calculated the distance between fixed object and moving object in a video. Using this distance I am trying to calculate the displacement of moving object in consecutive frame.

Question

rohan gupta 2014-11-20

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https://ww2.mathworks.cn/matlabcentral/answers/163479-i-have-calculated-the-distance-between-fixed-object-and-moving-object-in-a-video-using-this-dista

编辑： rohan gupta 2014-11-21

I have tried doing it, but I am getting error.

if true
  % code
end  X(r)=thisCentroid(:,1);
          Y(r)=thisCentroid(:,2);
          if r>=2
          dx=X(2)-X(1);
          dy=Y(2)-Y(1);
          dist_c(k)=hypot(dx,dy);
          save dist_c dist_c;
        for k=2:numberOfFrames
          q(k)=imsubtract(dist_c(k),dist_c(k-1));
        end

The error which I am getting while running the code is

Attempted to access dist_c(2); index out of bounds because numel(dist_c)=1 .

Error in Untitled2 (line 92)

            *q(k)=imsubtract(dist_c(k),dist_c(k-1));*
*

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Answer 1

sandeep 2014-11-20

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Try using pdist() function to calculate the distance between two points and save it to an array. It is not clear in the code about k value from the loop. It looks your dist_c has only one value and you are trying access from the second value.

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rohan gupta 2014-11-20

编辑：rohan gupta 2014-11-21

I tried using pdist(), its not working. I am still getting same error

When I comment the

q(k)=imsubtract(dist_c(k),dist_c(k-1));

I am able to get the distance between stationary object and moving object for all the frames. Now I am trying to find the displacement of the moving object with respect to stationary object by subtracting the obtained distance of previous frame & present frame. In my video there are in all 900 frames.

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