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Pose measurement is an important problem in computer vision. This paper presents a method for finding the closed form solutions to camera pose measurement problem by using 2D-3D correspondences of three Z shaped lines. This problem is a special case of Perspective-three-Line (P3L) problem. By introducing two undetermined parameters, we translate the problem into solving a quadratic equation. We also prove the problem's solution number depends on the relative position between the camera'sdoi:10.22266/ijies2011.0630.05 fatcat:wcxit7jt35g4vi3vhqzwous2ry