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.

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));*
*

Answer 1

[sandeep]

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.

[rohan gupta]

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.