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The presence of sensor array errors due to mutual coupling and channel mismatch among array sensors severely degrades the performance of direction-of-arrival (DOA) estimation algorithms. This paper proposes a novel sensor array errors calibration algorithm based on iterative least squares with projection (ILSP) algorithm, which suits for arbitrary array and only needs one auxiliary signal source....
Multi-camera tracking is quite different from single camera tracking in mathematical principles and application scenarios, and it faces new technology and system architecture challenges. The existing theories and algorithms used in object matching, cameras calibration and topology estimation, and information fusion have been reviewed and show that the integrated application of multi techniques and...
We propose a method for estimating the rectification homography of ground plane image using the plane's vertical vanishing point. First, the method computes the image of the horizon by a vertical prism pole in the image. Then, the two imaged circular points of the ground plane are computed from the image of absolute conic and the imaged horizon. At last, the image rectification is computed from the...
In the passive localization, the estimate error of sensor position and velocity is inevitable. By the use of the calibration, the sensor position and velocity will be improved, especially, to the Cramer-Rao lower bound (CRLB) under the ideal circumstance. The CRLB for the estimate of sensor position and velocity is derived at beginning. Then the CRLB for the estimate of source is followed. Finally,...
Self-calibration based on rotating cameras is a classical technique for recovering internal parameters which ensures that the camera motion is pure rotation and does not permit translation. In practice, however, it is hard to exactly keep the camera not to translate. Previous studies on this issue are mainly qualitative and less operable for practice applications. In this paper, we experimentally...
Vehicle flow volume on the motorway in the urban area is successfully used to realize traffic decision-making and guidance. In this research, we introduced some critical components into a vehicle flow detection system. In order to enhance the accuracy and instantaneity of the vehicle counting in quick-change traffic conditions, an adaptive modeling and updating method of background was proposed. In...
This paper firstly presents an image quality objective assessment method on the base of color moments. Then by analyzing the statistical characteristics of the subjective assessment results, this paper proposes a non-linear calibration algorithm using the worst image quality video sequence as the reference to separate the score interval of objective assessment. Combined with the similarity metric...
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