MATLAB: I have the corner coordinates for a rectangle in 3d space how do i find the coordinates for the center of the rectangle

geometryMATLAB

I have [x1,y1,z1],[x2,y2,z2],[x3,y3,z3],[x4,y4,z4] each representing a corner.

Best Answer

The center of a 3D rectangle is simply the mean of it's corners so a simple solution would be:

% each row is a coordinate, take the mean of the rows
mean([x1 y1 z1; x2 y2 z2; x3 y3 z3; x4 y4 z4],1)

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MATLAB: Bounding Box largest rectangle

stats is a structure array. Each element is a structure and has it's own bounding box. So stats(1).BoundingBox is the bounding box (x,y,width,height) of the first blob. And stats(2).BoundingBox is the bounding box (x,y,width,height) of the second blob, and so on. To display them all:

hold on;
for k = 1 : length(stats) % Loop through all blobs.
  % Find the bounding box of each blob.
  thisBlobsBoundingBox = stats(k).BoundingBox;  
  rectangle('Position', thisBlobsBoundingBox);
end

MATLAB: How to find four coordinates of inner rectangle

vsum=sum(image,1);
hsum=sum(image,2);
top=find(vsum,1,'first');
bottom=find(vsum,1,'last');
left=find(hsum,1,'first');
right=find(hsum,1,'last');

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MATLAB: Bounding Box largest rectangle

MATLAB: How to find four coordinates of inner rectangle

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