Patent ID: 9575574
Date: 2017-02-21
CPC Classifications: G06F

Claim:
1. A coordinate detection system, comprising: a coordinate input device configured to include a panel surface; an indication tool configured to execute an indication operation on the panel surface, the indication tool including a tip part; a first image taking device configured to take a first image of the indication tool, the first image taking device being disposed on the panel surface; a second image taking device configured to take a second image of the indication tool, the second image taking device being disposed on the panel surface; and an information processing device configured to detect a first set of two oblique lines based on an outline of the tip part in the first image, detect a second set of two oblique lines based on an outline of the tip part in the second image, and calculate coordinates of a vertex of the tip part on the panel surface based on a first point of intersection between the two oblique lines included in the first set and a second point of intersection between the two oblique lines included in the second set.