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...Anintroduction to projective geometry for computer vision stan birch eld introduction we are all familiar with euclidean and the fact that it describes our three dimensional world so well in sides of objects have lengths inter secting lines determine angles between them two said be parallel if they lie same plane never meet moreover these properties do not change when transformations translation rotation applied since geome try is at rst tempting think only type indeed word means measurement earth however consider imaging process a camera becomes clear insu cient no longer preserved mayintersect actually subset what known as there geometries similarity ne see relationships di erent consult figure models because allows much larger class than just translations rotations which includes perspective projections course...