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A sparse representation method for image-based surface defect detection

Optoelectronics Letters 2018年第6期14卷 476-480页

作者： YAO Ming-hai GU Qin-long College of Information Engineering Zhejiang University of Technology

In this paper, an efficient sparse representation-based method is presented for detecting surface defects. The proposed method uses the sparse degree of coefficient in the redundant dictionary for checking whether the test image is defective or not, and the binary representation of the defective images is obtained, according to the global coefficient feature. Owing to the requirements for the efficiency and detecting quality, the block proximal gradient operator is introduced to speed up the online dictionary learning. Considering the correlation among the testing samples, prior knowledge is applied in the orthogonal-matching-pursuit sparse representation algorithm to improve the speed of sparse coding. Experimental results demonstrate that the proposed detection method can effectively detect and extract the defects of the surface images, and has broad applicability.

关键词： surface defect detection A sparse representation method image-based

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image-based Brachytherapy in Cervical Cancer: Review and Experiences in Faculty of Medicine, Chiang Mai University

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Journal of Cancer Therapy 2013年第5期4卷 1-7页

作者： Ekkasit Tharavichitkul Somvilai Chakrabandhu Pitchayaponne Klunklin Wimrak Onchan Imjai Chitapanarux The Division of Therapeutic Radiology and Oncology Department of Radiology Faculty of Medicine Chiang Mai University Chiang Mai Thailand The Division of Therapeutic Radiology and Oncology Department of Radiology Faculty of Medicine Chiang Mai University Chiang Mai Thailand.

Cervical cancer is the one of the most common cancer in female patients inThailand. Radiotherapy has the role for the treatment of cervical cancer by postoperative, radical and palliative treatments. For radical radiotherapy, the combination of external beam radiation therapy and brachytherapy will be used to increase the tumor dose to curative goal. With the new development of medical images (Computed tomography (CT), Magnetic Resonance Imaging (MRI) or Ultrasonography (US)), the treatment with brachytherapy will be developed from point-based to volume-based concepts. Many studies reported the benefit of image-based brachytherapy over conventional brachytherapy and clinical benefit of using image-based brachytherapy in the treatment of cervical cancer.

关键词： image-based Brachytherapy Cervical Cancer Review

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Artistic Augmentation of Photographs with Droplets

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Journal of Computer Science & Technology 2019年第6期34卷 1294-1306页

作者： Mo-Han Zhang Jin-Hui Yu Kang Zhang Jun-Song Zhang State Key Laboratory of CAD&CG Zhejiang UniversityHangzhou 310027China Department of Computer Science Harbin Finance UniversityHarbin 150030China Department of Computer Science The University of Texas at DallasRichardsonTX 75080-3021U.S.A. Faculty of Information Technology Macao University of Science and TechnologyMacao 999078China National Engineering Research Center for E-Learning Central China Normal UniversityWuhan 430079China

Artistic augmentation of photographs with water droplets aims at generating aesthetic yet realistic images, and thus differs from traditional augmented reality in two aspects. One difference lies in the adoption of a new image as the environment map in order to render reflected or refracted effects on the surface of inserted water droplets. The other difference is in modeling of water droplets including hanging droplets and resting droplets. These differences raise two research challenges:(1) how to adjust the brightness and colors of the new environment map to maintain visual consistency between the new environment map and the original input image;(2) how to model hanging and resting droplets aesthetically. This paper proposes a framework that addresses these two challenges and demonstrates the effectiveness of our framework by generating example augmented images.

关键词： artistic augmentation augmented reality illumination estimation droplet modeling image-based modeling

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Calibratio performance evaluation of the spaceborne hyperspectral CHRIS imager

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Science China(Technological Sciences) 2006年第z2期49卷 88-96页

作者： ZHANG Xia ZHANG Bing HU Fangchao TONG Qingxi State Key Laboratory of Remote Sensing Science Institute of Remote Sensing Applications of Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Remote Sensing Science Institute of Remote Sensing Applications of Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Remote Sensing Science Institute of Remote Sensing Applications of Chinese Academy of Sciences Beijing 100101 China State Key Laboratory of Remote Sensing Science Institute of Remote Sensing Applications of Chinese Academy of Sciences Beijing 100101 China

The CHRIS (Compact High Resolution Imaging Spectrometer) is a new imaging spectrometer, carried on board a new space platform called PROBA (Project for On Board Autonomy). The satellite was successfully launched in October 2001 by the European Space Agency (ESA). CHRIS operates over the visible/near infrared band (400-1050 nm). It has five work modes and can reach a maximum of 62 spectral bands. In this research, atmospheric correction based on hyperspectral images was performed on CHRIS images by using the popular radiance transfer code ACORN (Atmospheric Correction Now) and empirical algorithms. ACORN was also used to evaluate the calibration performance of CHRIS by the retrieved spectra of typical vegetation and soil. As a result,the maize reflectance spectrum corrected by ACORN could characterize vegetation reflectance in the range of 498-750 nm, but gave a fairly large deviation beyond 750 nm,showing the deficiency of spectral calibration beyond 750 nm. The ACORN-derived soil reflectance decreased beyond 800 nm, which was quite inconsistent with field-spectrummeasurement and showed that the calibration accuracy couldn't meet the requirements of ACORN for spectral and radiometric calibration within a certain spectral range. In addition,the stripes on the retrieved water-vapor content map indicated that the radiance-calibration performance of CHRIS is not perfect. As the first spaceborne hyperspectral imager of ESA, the calibration performance of CHRIS needs to be improved.

关键词： CHRIS, hyperspectral, calibration performance, image-based atmospheric correction.

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Effect of Laryngopharyngeal Anatomy on Expiratory Airflow and Submicrometer Particle Deposition in Human Extrathoracic Airways

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Open Journal of Fluid Dynamics 2013年第4期3卷 286-301页

作者： Xiuhua Si Jinxiang Xi Jongwon Kim Department of Engineering Calvin College Grand Rapids USA Department of Mechanical and Biomedical Engineering Central Michigan University Mount Pleasant USA

The objective of this study is to systematically assess the influences of the larynopharyneal anatomical details on airflow and particle behaviors during exhalation by means of image-based modeling. A physiologically realistic nose-throat airway was developed with medical images. Individual airway anatomy such as uvula, pharynx, and larynx were then isolated for examination by progressively simplifying this image-based model geometry. Low Reynolds number (LRN) k-w model and Langrangian tracking model were used to simulate the dynamics of airflow and particle transport for a wide range of exhalation conditions (4-45 L/min) and particle sizes (1 nm-1 μm). Results showed that pharyngeal anatomical details exerted a significant impact on breathing resistance and particle profiles. Abrupt pressure drop resulting from the uvula-related airway obstruction was observed. Even though the total deposition rate in the nasal airway is largely unaffected by the upstream effect, the local deposition patterns vary notably. Results of this study also indicate that the pressure drop appears to be an appropriate parameter to characterize the geometric variations for diffusive depositions. Inclusion of pressure drop (D0.5Q-0.62dp0.07) gives an improved correlation than using the conventional diffusion factor (D0.5Q﹣0.28).

关键词： Medical image-based Modeling Nasal Airflow Uvula Breathing Resistance Nanoparticle Deposition

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The new method for generating pen drawing with NURBS Curve

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Computer Aided Drafting,Design and Manufacturing 2012年第4期22卷 36-40页

作者： CHEN Huang CHEN Jinchang School of Design South China University of Technology

With the improving of people＇s artistic aesthetic level, the art of pen drawing in all walks of life has been spread and ap- plied widely. However, the artistic effect of pen drawing is still far from perfect in the current methods for generating image-based pen drawing automatically by using computer technology. Therefore, the new method for generating pen drawing with NURBS Curve defines the characteristics of pen drawing in detail and redesigns the algorithm flow chart of pen drawing. It solves the prob- lem of the description of details of pen drawing and improves curve effect of pen drawing with NURBS Curve. It＇s able to better ex- press the artistic conception of pen drawing and solve the problem of simulating pen drawing of any image by using computer art simulation technology.

关键词： computer graphics pen drawing image-based NURBS curve artistic conception

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