| 摘要 |
A position information detection device, method, and program are provided, which are capable of detecting position information with high precision using simple and easily identified discrimination marks. A position information detection device has an image capture portion 203 which captures images of discrimination marks 102 arranged on a display 103, via a camera lens; a discrimination mark extraction portion 206 which extracts geometric figures from images captured by the image capture portion 203; a reference rectangle extraction portion 207 which extracts a reference rectangle image formed by connecting specific points in the geometric figures; a focal length calculation portion 213 which, based on a coordinate system specified by the reference rectangle image, calculates the focal length of the camera lens of the image capture portion 203 relative to the image display region of the display 103; and an indicated position calculation portion 210 which, based on the coordinate system and the focal length, calculates the indicated position of the image capture portion 203 relative to the image display region.
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