Abstract
The calibration of a projector-camera system is an essential step toward accurate 3-D measurement and environment-aware data projection applications, such as augmented reality. In this paper we present a two-stage easy-to-deploy strategy for robust calibration of both intrinsic and extrinsic parameters of a projector. Two key components of the system are the automatic generation of projected light patterns and the incremental calibration process. Based on the incremental strategy, the calibration process first establishes a set of initial parameters, and then it upgrades these parameters incrementally using the projection and captured images of dynamically-generated calibration patterns. The scene-driven light patterns allow the system to adapt itself to the pose of the calibration target, such that the difficulty in feature detection is greatly lowered. The strategy forms a closed-loop system that performs self-correction as more and more observations become available. Compared to the conventional method, which requires a time-consuming process for the acquisition of dense pixel correspondences, the proposed method deploys a homography-based coordinate computation, allowing the calibration time to be dramatically reduced. The experimental results indicate that an improvement of 70% in reprojection errors is achievable and 95% of the calibration time can be saved.
Highlights
IntroductionOne of the most fundamental problems in the field of computer vision is how to estimate geometric parameters of an image sensor
One of the most fundamental problems in the field of computer vision is how to estimate geometric parameters of an image sensor. It forms an active vision system where the image sensor is coupled with a light projector. The performance of such an active vision-based measuring instrument heavily relies on an accurate calibration procedure to determine the geometric parameters of the paired image sensor and light projector
We have presented an innovative method to reliably establish the calibration datasets for a project-camera system
Summary
One of the most fundamental problems in the field of computer vision is how to estimate geometric parameters of an image sensor. It forms an active vision system where the image sensor is coupled with a light projector. The performance of such an active vision-based measuring instrument heavily relies on an accurate calibration procedure to determine the geometric parameters of the paired image sensor and light projector. The interest in calibrating video projectors has been significantly increasing in the last decade (see [4,5,7,8,9,10,11,12] for example)
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