Dr. Xiuqin Rao Profile

Dr. Xiuqin Rao

at Zhejiang Univ

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Author

Publications (17)

SPIE Journal Paper | 19 December 2018

Active contours driven by grayscale morphology fitting energy for fast image segmentation

Linfang Xiao, Keyan Ding, Jinfeng Geng, Xiuqin Rao

JEI, Vol. 27, Issue 06, 063029, (December 2018) https://doi.org/10.1117/12.10.1117/1.JEI.27.6.063029

KEYWORDS: Image segmentation, Laser induced fluorescence, Image processing, Medical imaging, Agriculture, Data modeling, Statistical modeling, Lithium, Convolution, Gaussian filters

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Proceedings Article | 17 May 2016 Paper

Relationship between shelf-life and optical properties of Yuanhuang pear in the region of 400-1150 nm

Xueming He, Xiaping Fu, Xiuqin Rao, Zhenhuan Fang

Proceedings Volume 9864, 986407 (2016) https://doi.org/10.1117/12.2223307

KEYWORDS: Optical properties, Integrating spheres, Tissues, System integration, Reflectivity, Transmittance, Calibration, Solids, Liquids, Absorption

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Proceedings Article | 5 May 2012 Paper

Classification of Korla fragrant pears using NIR hyperspectral imaging analysis

Xiuqin Rao, Chun-Chieh Yang, Yibin Ying, Moon Kim, Kuanglin Chao

Proceedings Volume 8369, 83690Y (2012) https://doi.org/10.1117/12.922686

KEYWORDS: Hyperspectral imaging, Statistical modeling, Packaging, Near infrared, Imaging systems, Reflectivity, Image classification, Algorithm development, Binary data, Agriculture

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Proceedings Article | 12 October 2007 Paper

Walnut shell and meat classification using texture analysis and SVMs

Fenghua Jin, Lei Qin, Xiuqin Rao, Yang Tao

Proceedings Volume 6761, 67610Q (2007) https://doi.org/10.1117/12.730907

KEYWORDS: Wavelets, Image classification, Image filtering, Binary data, Cameras, Imaging systems, Feature selection, Wavelet transforms, Inspection, Transmittance

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Proceedings Article | 12 October 2007 Paper

Analysis and selection of the methods for fruit image denoise

Jiangsheng Gui, Benxue Ma, Xiuqin Rao, Yibin Ying

Proceedings Volume 6761, 676117 (2007) https://doi.org/10.1117/12.735194

KEYWORDS: Signal to noise ratio, Digital filtering, Image filtering, Image restoration, Gaussian filters, Diffusion, Image quality, Machine vision, Image processing, Wavelets

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Proceedings Article | 10 September 2007 Paper

Fruit shape classification using support vector machine

Jiangsheng Gui, Xiuqin Rao, Yibin Ying

Proceedings Volume 6764, 67640Z (2007) https://doi.org/10.1117/12.735235

KEYWORDS: Shape analysis, Machine vision, Image processing, Feature extraction, Principal component analysis, Binary data, Image classification, Inspection, Neural networks, Computer vision technology

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Proceedings Article | 23 October 2006 Paper

Fruit edge detection-based gradient vector flow

Jiangsheng Gui, Yibing Ying, Xiuqin Rao

Proceedings Volume 6381, 63810O (2006) https://doi.org/10.1117/12.685990

KEYWORDS: Image segmentation, Machine vision, Agriculture, Edge detection, Systems modeling, 3D modeling, Image processing, Visual process modeling, Image analysis, Computer vision technology

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Proceedings Article | 23 October 2006 Paper

Laser scatter feature of surface defect on apples

Xiuqin Rao, Yibin Ying, YiKe Cen, Haibo Huang

Proceedings Volume 6381, 638113 (2006) https://doi.org/10.1117/12.686065

KEYWORDS: Laser scattering, Machine vision, Projection systems, Inspection, Cameras, Laser development, Imaging systems, Computing systems, CCD cameras, Frame grabbers

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Proceedings Article | 23 October 2006 Paper

Egg weight detection on machine vision system

Yike Cen, Yibin Ying, Xiuqin Rao

Proceedings Volume 6381, 638114 (2006) https://doi.org/10.1117/12.686479

KEYWORDS: Machine vision, Image segmentation, Visual process modeling, Data modeling, Algorithm development, Feature extraction, Neural networks, Edge detection, CCD cameras, Frame grabbers

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Proceedings Article | 2 October 2006 Paper

A new algorithm for fruit shape classification based on level set

Jiangsheng Gui, Yibin Ying, Xiuquin Rao

Proceedings Volume 6384, 63840X (2006) https://doi.org/10.1117/12.685894

KEYWORDS: Databases, Scene classification, Machine vision, Transform theory, Shape analysis, Evolutionary algorithms, Inspection, Image classification, Algorithm development, Computer vision technology

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Proceedings Article | 9 November 2005 Paper

Color model for fruit quality inspection with machine vision

Xiuqin Rao, Yibin Ying

Proceedings Volume 5996, 59960S (2005) https://doi.org/10.1117/12.630504

KEYWORDS: RGB color model, Inspection, Machine vision, Visual process modeling, Skin, Computer programming, Computing systems, Imaging systems, Light sources and illumination, CCD cameras

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Proceedings Article | 9 November 2005 Paper

A method of size inspection for fruit with machine vision

Xiuqin Rao, Yibin Ying

Proceedings Volume 5996, 59961C (2005) https://doi.org/10.1117/12.630534

KEYWORDS: Machine vision, Inspection, Scalable video coding, Image processing, Computer programming, Scene classification, Light sources and illumination, CCD cameras, Imaging systems, Computing systems

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Proceedings Article | 8 November 2005 Paper

A novel fruit shape classification method based on multi-scale analysis

Jiangsheng Gui, Yibin Ying, Xiuqin Rao

Proceedings Volume 5996, 59961F (2005) https://doi.org/10.1117/12.630526

KEYWORDS: Wavelets, Shape analysis, Machine vision, Inspection, Edge detection, Neural networks, Fractal analysis, Feature extraction, Detection and tracking algorithms, Image classification

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Proceedings Article | 19 November 2004 Paper

Determination of acoustic vibration in watermelon by finite element modeling

Jamal Nourain, Yibin Ying, Jianping Wang, Xiuqin Rao

Proceedings Volume 5587, (2004) https://doi.org/10.1117/12.576953

KEYWORDS: Spherical lenses, Finite element methods, Acoustics, Sensors, Data acquisition, Nondestructive evaluation, Signal processing, Inspection, Solids, Software development

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The analysis of the vibration responses of a fruit is suggested to measure firmness non-destructively. A wooden ball excited the fruits and the response signals were captured using an accelerometer sensor. The method has been well studied and understood on ellipsoidal shaped fruit (watermelon). In this work, using the finite element simulations, the applicability of the method on watermelon was investigated. The firmness index is dependent on the mass, density, and natural frequency of the lowest spherical modes (under free boundary conditions). This developed index extends the firmness estimation for fruits or vegetables from a spherical to an ellipsoidal shape. The mode of Finite element analysis (FEA) of watermelon was generated based on measured geometry, and it can be served as a theoretical reference for predicting the modal characteristics as a function of design parameters such as material, geometrical, and physical properties. It was found that there were four types of mode shapes. The 1st one was first-type longitudinal mode, the 2nd one was the second-type longitudinal mode, the 3rd one was breathing mode or pure compression mode, and the fourth was flexural or torsional mode shape. As suggested in many references, the First-type spherical vibration mode or oblate-Prolate for watermelon is the lowest bending modes, it's most likely related to fruit firmness. Comparisons of finite element and experimental modal parameters show that both results were agreed in mode shape as well as natural frequencies. In order to measure the vibration signal of the mode, excitation and sensors should be placed on the watermelon surface far away from the nodal lines. The excitation and the response sensors should be in accordance with vibration directions. The correlations between the natural frequency and firmness was 0.856, natural frequency and Young's modulus was 0.800, and the natural frequency and stiffness factor (SF) was 0.862. The stiffness factor (SF) is adequate expression for the Modulus of Elastic (MOE), and adopted in the evaluation of their firmness.

Proceedings Article | 19 November 2004 Paper

Research on the gray distortion and calibration of machine vision system

Yucheng Ye, Jianping Wang, Yibin Ying, Xiuqin Rao

Proceedings Volume 5587, (2004) https://doi.org/10.1117/12.571274

KEYWORDS: Calibration, Distortion, Machine vision, Visual process modeling, Imaging systems, Image processing, CCD cameras, Cameras, Light sources and illumination, Inspection

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Proceedings Article | 19 November 2004 Paper

A line-scanned based digit image description method and its application in fruit quality inspection

Xiuqin Rao, Yibin Ying

Proceedings Volume 5587, (2004) https://doi.org/10.1117/12.571264

KEYWORDS: Image segmentation, Image processing, Image filtering, Image quality, Imaging arrays, Inspection, Machine vision, Digital filtering, Sensors, Binary data

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Proceedings Article | 19 November 2004 Paper

Real-time fruit size inspection based on machine vision

Jiangsheng Gui, Yibin Ying, Xiuqin Rao

Proceedings Volume 5587, (2004) https://doi.org/10.1117/12.571275

KEYWORDS: Inspection, Image processing, Machine vision, RGB color model, Digital filtering, Calibration, Image filtering, Optical filters, Light sources and illumination, 3D modeling

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Showing 5 of 17 publications

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