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Research on the Method of Parallax Adjustment for Active Stereo Camera Systems
Abstract
Parallax adjustment is still playing a very difficult part in stereoscopic shooting, because each factor changes, such as baseline, convergence, view angle, would change the perceptual distances of the whole image. In this paper, we estimated the effect about these factors in stereoscopic shooting, and proposed a parallax adjustment method for active stereo camera system. The proposed method can provide the optimal baseline and convergence value by feedback calculation in the following cases. 1. Specified parallax range of the scene. 2. Specified perceptual distances of a given object. We implement the method on an active stereo camera system. With this system, users can pay their attention on the stereo effect, the baseline and convergence will be real-time controlled automatically to achieve the stereo effect which users want to obtain. We evaluated the method in natural environment, and it is shown that the specified stereo effect can be obtained faster and more accurate.
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This paper presents a consistent framework for continuous stereo self-calibration. Based on a practical analysis of the sensitivity of stereo reconstruction to camera calibration uncertainties, we identify important parameters for self-calibration. We evaluate different geometric constraints for estimation and tracking of these parameters: bundle adjustment with reduced structure representation relating corresponding points in image sequences, the epipolar constraint between stereo image pairs, and trilinear constraints between image triplets. Continuous, recursive calibration refinement is obtained with a robust, adapted iterated extended Kalman filter. To achieve high accuracy, physically relevant geometric optimization criteria are formulated in a Gauss-Helmert type model. The self-calibration framework is tested on an active stereo system. Experiments with synthetic data as well as on natural indoor and outdoor imagery indicate that the different constraints are complementing each other and thus a method combining two of the above constraints is proposed: While reduced order bundle adjustment gives by far the most accurate results (and might suffice on its own in some environments), the epipolar constraint yields instantaneous calibration that is not affected by independently moving objects in the scene. Hence, it expedites and stabilizes the calibration process.