MATLAB: Is the algorithm (detect corners of checker board) fail

calibration of cameraComputer Vision Toolbox

I=checkerboard(80,5,5);
I=I>0.5;
[imagePoints,boardSize] = detectCheckerboardPoints(I);
figure;
subplot(1,2,1);
imshow(I);hold on;
plot(imagePoints,'r+');
title('detectCheckerboardPoints method');
subplot(1,2,2);
plot(imagePoints,'r+');

Best Answer

Do:

plot(imagePoints(:,1),imagePoints(:,2),'r+');

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MATLAB: Is the pointsToWorld back-projection inverted

You may need to convert the camera world pose to extrinsics using cameraPoseToExtrinsics:

[worldOri,worldLoc] = estimateWorldCameraPose(worldPoints(:,[1 2]),worldPoints,intrinsics);
[rotationMatrix,translationVector] = cameraPoseToExtrinsics(worldOri,worldLoc);
backProjectPoints = pointsToWorld(intrinsics,rotationMatrix,translationVector,imagePoints);

MATLAB: Prime number list checker

Your code for resetting "counter" is inside an if-test. You need to move it so that it always executes. E.g.,

%#Want to test numbers 2:n if they're prime
prompt = input('max number to test: ');
n = prompt;
l = 2; %#start of mod test
counter = 0;
tic
for i = 2:n %#cycle to test 2 up to n
  t = floor(sqrt(i)); %#Only need to test up to root of number
  counter = 0;  % <-- Moved from below
  for l = 2:t
    if mod(i,l) == 0 
      break
    else
      counter = (counter + 1);
    end
  end
  if counter == t-1 %# if tested up to the root of the number, it must be prime
    prime = sprintf('%d is prime', round(i));
    disp(prime)
%    counter = 0;   % <-- Moved to up above
  end
end
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MATLAB: Is the pointsToWorld back-projection inverted

MATLAB: Prime number list checker

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