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# Constraints for interpretation of line drawings under perspective projection

@article{Ulupinar1991ConstraintsFI, title={Constraints for interpretation of line drawings under perspective projection}, author={Fatih Ulupinar and Ramakant Nevatia}, journal={CVGIP: Image Understanding}, year={1991}, volume={53}, pages={88-96} }

- Published 1991 in CVGIP: Image Understanding
DOI:10.1016/1049-9660(91)90007-C

vector notation and then give two different representations. The first representation is the regular gradient space; it has the advantage of simplicity but contains important singularities. The second one is just a regular vector (p, 4, r) in 3-D with the constraint that p* + q* + r* = 1. (5) This can represent the normal of any plane in 3-D, with the added complexity that Eq. (5), a quadratic equation, should be included among the equations to be solved. 3.2. Shared Boundary Constraint This… CONTINUE READING