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A Technique of Camera Calibration using Single View
Kaset Sirisantisamrid,Kitti Tirasesth,Takenobu Matsuura 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper proposes a technique of camera calibration to calibrate a camera. It is easy for the proposed technique to extract the camera parameters with only one image using an iteration method. In this paper, radial and tangential lens distortion is modeled. The proposed technique divides original parameters into block of parameters. Each block of parameters is computed by minimizing a nonlinear error function after the intermediate parameters are linearly computed on each iteration. The formal distorted images and the distorted images with shifted principal point have been used to test the proposed technique and the conventional method. As the result, we have obtained good results.
A Determination Method of Initial Camera Parameters for Coplanar Calibration
Kaset Sirisantisamrid,Kitti Tirasesth,Takenobu Matsuura 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.5
Most coplanar calibration algorithms determine the initial camera parameters from a single image under the assumption that the principal point is known in advance. However, the camera orientations, the shifted principal point and the noise corrupted on images have an influence on the estimated initial camera parameters under the above assumption. This paper proposes a useful method to determine the initial camera parameters for coplanar calibration. The proposed method can determine the initial camera parameters from the single image, wherein the principal point is considered as a parameter. In our experiments, both synthetic and real images are used. The experimental results show that the proposed method provides both stable initial camera parameters and noise robustness for changes of camera orientations, noise levels and shifts of principal point.
A Simple Technique for Coplanar Camera Calibration
Kaset Sirisantisamrid,Kitti Tirasesth,Takenobu Matsuura 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper proposes a simple technique for camera calibration under assumption that a calibration pattern is on world coordinate system. The proposed method consists of two steps. In the first step, the intermediate parameters, lens distortion coefficients, principal point and the distances between sensors are computed by an iterative linear method. Then, the camera parameters are determined from the obtained intermediate parameters. In the experimental results, the proposed method gives the accurate and stable camera parameters for change rotation angles when compared with the conventional method.
An Influential Principal Point on Camera Parameters
Kaset Sirisantisamrid,Teerawat Thepmanee,Kitti Tirasesth,Takenobu Matsuura 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper proposes a method of camera calibration and the influence of principal point on camera parameters. The camera parameters are represented in terms of a set of intermediate parameters. The intermediate parameters and lens distortion coefficients are iteratively computed. The image coordinates are rectified on each cycle of iteration. Once the iteration is terminated, the initial parameters are computed from the obtained intermediate parameters. Then, the camera parameters and distortion coefficients are iteratively computed from the obtained initial parameters and the image coordinates are rectified too. In the experimental results, the proposed method is tested by change principal point to observe the influential principal point on camera parameters and compared the results with the conventional method.
Simple VCO with Negative Voltage-Frequency Relation
Sawai Pongswatd,Amphawan Julsereewong,Kitti Tirasesth,Hirofumi Sasaki,Yan Shi 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
A simple voltage controlled oscillator (VCO) with negative voltage-frequency (V-F) relation is presented in this paper. The realization technique is based on the use of commercial available devices to generate tunable sawtooth and square wave signals. Decreasing the control voltage linearly increases the output oscillation frequency. The proposed VCO consists of operational transconductance amplifiers (OTAs) and an RS Flip Flop. Experimental results showing the circuit performances are agreed with the expected values. The usefulness of the proposed circuit is demonstrated through application example with reducing the output ripple waveforms of a buck converter.
Design of PID Controller for the Modified Quadruple-Tank Process using Inverted Decoupling Technique
Arjin Numsomran,Vittaya Tipsuwanporn,Thanit Trisuwannawat,Kitti Tirasesth 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
This paper presents the approach to design PID controller for a modified quadruple-tank process using inverted decoupling technique. In case of non-minimum phase, TITO system, such as modified quadruple-tank process which can’t be controlled by PID controller with standard decoupling technique because the system can’t be stabled by saturating manipulate signal. With the proposed method, The inverted decoupling controllers, decreasing the cross coupling between inputs and outputs, transform TITO plant transfer function model into SISO form so that SISO controller for each SISO model can be designed by Root Locus Technique easily and efficiently. PID controller with inverted decoupling can stabilize an unstable non-minimum-phase system and minimize several undesirable influences from an interaction in TITO process. The results from control system design can be illustrated by the experiments.
Design PID Controller for the Modified Quadruple-Tank Process using Root Locus
Arjin Numsomran,Vittaya Tipsuwanporn,Thanit Trisuwannawat,Kitti Tirasesth 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
This paper presents the approach to design the siso controller with Decoupling for a Modified Quadruple-Tank process. The structure of controller design can minimize several undesirable influences from an interaction in TITO Process. The decoupling controllers transform TITO plant transfer function model into SISO form so that SISO controller for each SISO model can be designed by Root Locus Technique easily and efficiently. The results from decoupling and SISO controller design can be illustrated by experiments.