Method for calibrating a projector with a camera

• US 6,527,395 B1
• Filed: 12/10/2001
• Issued: 03/04/2003
• Est. Priority Date: 12/10/2001
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Electric Research Laboratories, Inc. (Mitsubishi Electric Corporation)
• Inventors: Raskar, Ramesh, Beardsley, Paul
• Primary Examiner(s): DOWLING, WILLIAM C
• Application Number:
  US10/012,930
• Time in Patent Office: 449 Days
• Field of Search: 353/69, 353/70, 348/745, 348/746, 348/747, 348/806
• US Class Current: 353/70
• CPC Class Codes: G03B 21/14 Details
• CPC Class Codes: H04N 9/3185 Geometric adjustment, e.g. keystone or convergence optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A method calibrates a projector with a camera being a fixed physical relationship relative to each other. An output image is projected onto a display surface for a first and second pose of the projector and the camera relative to a display surface. For each pose, an input image is acquired. For each pose, a projector perspective projection matrix and a camera perspective projection matrix is determined from each input image. For each pose, a transformation from the projector perspective projection matrix and the camera perspective projection matrix to Euclidean form is determined, and the projector intrinsic parameters from the transformations.

Claims

1. A method for calibrating a projector with a camera being a fixed physical relationship relative to each other, comprising:

projecting an output image onto a display surface for a first and second pose of the projector and the camera relative to a display surface;

acquiring, for each pose, an input image;

determining, for each pose, a projector perspective projection matrix and a camera perspective projection matrix from each input image;

determining, for each pose, a transformation from the projector perspective projection matrix and the camera perspective projection matrix to Euclidean form; and

deriving the projector intrinsic parameters from the transformations.