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Matlab

function keypoint_trans=project_keypoint(keypoint,H)
%find location of keypoint after projection operator applied
keypoint_trans=H*[fliplr(keypoint),ones(size(keypoint,1),1)]';
keypoint_trans=keypoint_trans';
keypoint_trans=keypoint_trans./keypoint_trans(:,3);
keypoint_trans=keypoint_trans(:,1:2);
keypoint_trans=round(fliplr(keypoint_trans));