CCD Noise Calibration and its Application in Edge Location

Xiaohua, 丁晓华 Ding; You, 李由 Li; Qifeng, 于起峰 Yu; Weidong, 冯卫东 Feng

doi:10.3788/aos20082801.0099

Cited by 6 publications

(2 citation statements)

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“…and the locating precision of stepping motor is 18 angle seconds, a 5% CCD random response error with uniform distribution is added [9], and after 100 times of simulation and calculation the error values are listed in Tab. The measurement error of the X-directional DOP is reduced from 4.91% to 0.08%, the measurement error of PP is reduced from 0.07% to 0.01%, and the measurement error of IPS is reduced from 0.49% to 0.03%.…”

Section: Simulation and Analysismentioning

confidence: 99%

A Research on Improving the Precision of Rotating-Wave Plate Polarization Measurement

Hou

Lin

Fan

2015

AMM

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The device errors of a rotating-wave-plate-based polarization measurement system can be mainly categorized as the angle error of the polarization prism, the fast axis angle error of wave-plate and the retardation error. By applying Fourier analysis to solve Stokes vectors, we obtain the formulas to calculate the three errors mentioned above, using linear 0° and 45° polarized light to illuminate the system for the error solving. We analyze the measurement errors of the degree of polarization, the polarization purity and the intensity of polarization state, under certain simulation conditions. The results show that after the calibration, the measurement accuracy is improved. Finally, we analyze the effects of the angle error of the linear polarized light used for calibration to the measurement of the three parameters.

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Section: Simulation and Analysismentioning

confidence: 99%

A Research on Improving the Precision of Rotating-Wave Plate Polarization Measurement

Hou

Lin

Fan

2015

AMM

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“…Liquid automatic filling technology is widely used in petroleum, chemical, beverage, medical filling process. If the hole of barrel is not a center position, filling process is a semi-automatic mode at home and abroad, namely artificial filling [2][3] . This reduces the production efficiency seriously.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Positioning Barrel Eccentric Hole Based on Machine Vision Technology

2011

AMM

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A measurement based on image process is proposed for detecting the hole on a barrel. The barrel image is separated from background with the image edge detection technology. The different detection operators are compared and the sobel operator is used for edge detection. The actual space position of the hole on barrel is computed by circle detecting method. Gradient hough transform is used for detecting circle position information, including circle radius and two dimension coordinates. The stepping motor drive system is consists of a control card, stepping motor drive units and two two-phase hybrid stepping motors. Automatic positioning is achieved through stepping motor drive system.

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Dimensional Measurement of Small Hot Pieces Based on a Monochrome CCD

Liu

et al. 2015

Procedia Engineering

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For the purpose of controlling the quality of forging process, a low-priced monochrome CCD is adopted to establish a vision measurement system to gauge the two-dimensional sizes of hot parts accurately in the paper. To derive the two dimensions of the forgings, comparison measurement method is employed. In the system, images are taken by the CCD through an infrared filter to filter out the strong light emitted from the forgings. And then average filtering and morphological filtering are used to reduce the effect of image noise. In order to improve the precision of geometry position, image distortion is corrected to reduce the optical distortion errors. After that, the edges in images are extracted at sub-pixel level to improve the location accuracy of geometry features. After calibration, the horizontal equivalent size of a pixel is 0.119mm, while the vertical 0.120mm. As be verified, the horizontal measurement uncertainty is 0.0069mm, while vertical 0.0063mm. Images of a 45 # steel cuboid at 1000 are captured and its dimensions are calculated through the procedure described in the paper, which have a difference less than 0.5mm compared with the theoretical values, indicating the precision and practicality of the method proposed in the paper.

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CCD Noise Calibration and its Application in Edge Location

Cited by 6 publications

References 0 publications

A Research on Improving the Precision of Rotating-Wave Plate Polarization Measurement

A Research on Improving the Precision of Rotating-Wave Plate Polarization Measurement

Measurement of Positioning Barrel Eccentric Hole Based on Machine Vision Technology

Dimensional Measurement of Small Hot Pieces Based on a Monochrome CCD

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