The Experts below are selected from a list of 17670 Experts worldwide ranked by ideXlab platform
Ching-te Chiu - One of the best experts on this subject based on the ideXlab platform.
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Edge Curve Scaling and Smoothing with Cubic Spline Interpolation for Image Up-Scaling
Journal of Signal Processing Systems, 2015Co-Authors: Tsun-hsien Wang, Ching-te ChiuAbstract:Image up-scaling is an important technique to increase the resolution of an image. Earlier interpolation based approaches have low computation complexity while cause blurring and ringing artifacts in Edge regions due to the loss of high frequency details. Patch-based super resolution achieves satisfactory up-scaling images at the penalty of high computation cost. In this paper, we present a scalable Edge map to recover high frequency components of Edge regions in up-scaled images to improve the sharpness and use a range compression method to reduce ringing artifacts. We propose an efficient 1-D and 2-D approaches to extract Edge Curves from an original image. Then the cubic spline interpolation is adopted to up-scale an Edge map. A smooth function is added to remove zigzag, stair, trapezoid artifacts. Then we apply the patch-based method only on up-scaled Edge map to recover the high frequency components. The execution time of our proposed method is only 10 % to 5 % compared to the multi-resolution patch-based super resolution method. Experimental results show that we can achieve similar image quality with G. Freedman et al.’s method [ 19 ].
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SiPS - Edge Curve scaling and smoothing with cubic spline interpolation for image upscaling
Journal of Signal Processing Systems, 2014Co-Authors: Tsun-hsien Wang, Ching-te ChiuAbstract:In this paper, we propose an Edge map up-scaling method. We propose an Edge Curve scaling method with cubic spline interpolation to up-scale an Edge map. If an Edge Curve is directly applied to the cubic spline interpolation function for Edge Curve up-scaling, the Edge Curve scaling results have zigzag artifacts. We also propose a simple smoothing function to avoid the zigzag problems and maintain the contour shape of images. By predicting Edge regions of the up-scaled image, we can recover high frequency components of Edge regions of the up-scaled image to improve the sharpness and reduce ringing artifacts.
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Edge Curve scaling and smoothing with cubic spline interpolation
International Conference on Image Processing, 2013Co-Authors: Tsun-hsien Wang, Ching-te ChiuAbstract:Image scaling is a widely used method for many applications and numerous approaches have been proposed to this issue. Current approaches that bring promising results while the Edge Curves of the scaled up image still have blurring effect. This paper focuses on the Edge Curve of an image. We propose a simple method for Edge Curve scaling to avoid the disconnect and zigzag problems when using cubic spline interpolation. The scaling results of our method can avoid blurring of the Edge Curve and maintain the Edge contour of an input image.
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Edge Curve scaling and smoothing with cubic spline interpolation for image upscaling
SiPS 2013 Proceedings, 2013Co-Authors: Wei Chen Wu, Tsun-hsien Wang, Ching-te ChiuAbstract:In this paper, we propose an Edge map up-scaling method. We propose an Edge Curve scaling method with cubic spline interpolation to up-scale an Edge map. If an Edge Curve is directly applied to the cubic spline interpolation function for Edge Curve up-scaling, the Edge Curve scaling results have zigzag artifacts. We also propose a simple smoothing function to avoid the zigzag problems and maintain the contour shape of images. By predicting Edge regions of the up-scaled image, we can recover high frequency components of Edge regions of the up-scaled image to improve the sharpness and reduce ringing artifacts.
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ICIP - Edge Curve scaling and smoothing with cubic spline interpolation
2013 IEEE International Conference on Image Processing, 2013Co-Authors: Tsun-hsien Wang, Ching-te ChiuAbstract:Image scaling is a widely used method for many applications and numerous approaches have been proposed to this issue. Current approaches that bring promising results while the Edge Curves of the scaled up image still have blurring effect. This paper focuses on the Edge Curve of an image. We propose a simple method for Edge Curve scaling to avoid the disconnect and zigzag problems when using cubic spline interpolation. The scaling results of our method can avoid blurring of the Edge Curve and maintain the Edge contour of an input image.
Liu Yu - One of the best experts on this subject based on the ideXlab platform.
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The design and research of a straw chopper returning corn stubble to the field
2010 The 2nd International Conference on Industrial Mechatronics and Automation, 2010Co-Authors: Ni Yanguang, Liu YuAbstract:With reference to the advantages of the side Edge Curve of the scimitar-chip rotary blade and the cutting Edge Curve of scimitar-chip, this paper analyzes the working principle and features of the straight knives, machetes and rotary blade. In order to reduce power consumption and increase corn stubble broken pass rate, this paper designed a new type of corn stubble chopper tool (crescent knife), and conducted fieldwork test. The results show that: the field operation of this new type of field straw chopper with corn stubble is effective, and the power consumption is low so that it is suitable to be widely used.
Shyue-cheng Yang - One of the best experts on this subject based on the ideXlab platform.
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A mathematical model of a cc-type single-screw compressor
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2004Co-Authors: Shyue-cheng YangAbstract:AbstractIn this paper, a method is proposed for determining a basic profile of a cc-type single-screw compressor including the gate rotor and the screw rotor. The cc-type has a cylindrical screw and two cylindrical gate rotors. Based on this method, a mathematical model of the meshing principles of a cc-type screw rotor meshed with a gate rotor, that has either straight Edge teeth or conical teeth, is presented.The inverse envelope concept is used to determine the cutting-Edge Curve of a gate rotor. Based on this concept, the required cutter for machining a cc-type screw rotor can be obtained by the envelope of a one-parameter family. The obtained screw rotor is an envelope to the family of the gate rotor's surfaces. The obtained envelope becomes the generating surface. The inverse envelope can be used to obtain the envelope to the family of generating surfaces. Then the profile of a gate rotor cutting-Edge Curve can be easily obtained.The surface analysis including contact lines is shown for the design a...
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A mathematical model of the rotor profile of the single-screw compressor
Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science, 2002Co-Authors: Shyue-cheng YangAbstract:AbstractThis paper presents a method for determining the basic profile of a single-screw compressor including a gate rotor and a screw rotor. The inverse envelope concept for determining the cutting-Edge Curve of the gate rotor is presented. Based on this concept, the required cutter for machining the screw rotor can be obtained by an envelope of the one-parameter family of obtained screw rotors. The obtained screw rotor is an envelope of the family of gate rotor surfaces. Let the obtained envelope of the one-parameter family of gate rotor surfaces become the generating surface. The inverse envelope can be used to obtain the envelope of the family of generating surfaces. Then, the profile of the gate rotor with the cutting-Edge Curve can be easily obtained. The proposed method shows that the gate rotor and the screw rotor are engaged along the contact line at every instant. This is essential to reduce the effect of leakage on compressor performance. In this paper, a mathematical model of the meshing princ...
Tsun-hsien Wang - One of the best experts on this subject based on the ideXlab platform.
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Edge Curve Scaling and Smoothing with Cubic Spline Interpolation for Image Up-Scaling
Journal of Signal Processing Systems, 2015Co-Authors: Tsun-hsien Wang, Ching-te ChiuAbstract:Image up-scaling is an important technique to increase the resolution of an image. Earlier interpolation based approaches have low computation complexity while cause blurring and ringing artifacts in Edge regions due to the loss of high frequency details. Patch-based super resolution achieves satisfactory up-scaling images at the penalty of high computation cost. In this paper, we present a scalable Edge map to recover high frequency components of Edge regions in up-scaled images to improve the sharpness and use a range compression method to reduce ringing artifacts. We propose an efficient 1-D and 2-D approaches to extract Edge Curves from an original image. Then the cubic spline interpolation is adopted to up-scale an Edge map. A smooth function is added to remove zigzag, stair, trapezoid artifacts. Then we apply the patch-based method only on up-scaled Edge map to recover the high frequency components. The execution time of our proposed method is only 10 % to 5 % compared to the multi-resolution patch-based super resolution method. Experimental results show that we can achieve similar image quality with G. Freedman et al.’s method [ 19 ].
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SiPS - Edge Curve scaling and smoothing with cubic spline interpolation for image upscaling
Journal of Signal Processing Systems, 2014Co-Authors: Tsun-hsien Wang, Ching-te ChiuAbstract:In this paper, we propose an Edge map up-scaling method. We propose an Edge Curve scaling method with cubic spline interpolation to up-scale an Edge map. If an Edge Curve is directly applied to the cubic spline interpolation function for Edge Curve up-scaling, the Edge Curve scaling results have zigzag artifacts. We also propose a simple smoothing function to avoid the zigzag problems and maintain the contour shape of images. By predicting Edge regions of the up-scaled image, we can recover high frequency components of Edge regions of the up-scaled image to improve the sharpness and reduce ringing artifacts.
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Edge Curve scaling and smoothing with cubic spline interpolation
International Conference on Image Processing, 2013Co-Authors: Tsun-hsien Wang, Ching-te ChiuAbstract:Image scaling is a widely used method for many applications and numerous approaches have been proposed to this issue. Current approaches that bring promising results while the Edge Curves of the scaled up image still have blurring effect. This paper focuses on the Edge Curve of an image. We propose a simple method for Edge Curve scaling to avoid the disconnect and zigzag problems when using cubic spline interpolation. The scaling results of our method can avoid blurring of the Edge Curve and maintain the Edge contour of an input image.
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Edge Curve scaling and smoothing with cubic spline interpolation for image upscaling
SiPS 2013 Proceedings, 2013Co-Authors: Wei Chen Wu, Tsun-hsien Wang, Ching-te ChiuAbstract:In this paper, we propose an Edge map up-scaling method. We propose an Edge Curve scaling method with cubic spline interpolation to up-scale an Edge map. If an Edge Curve is directly applied to the cubic spline interpolation function for Edge Curve up-scaling, the Edge Curve scaling results have zigzag artifacts. We also propose a simple smoothing function to avoid the zigzag problems and maintain the contour shape of images. By predicting Edge regions of the up-scaled image, we can recover high frequency components of Edge regions of the up-scaled image to improve the sharpness and reduce ringing artifacts.
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ICIP - Edge Curve scaling and smoothing with cubic spline interpolation
2013 IEEE International Conference on Image Processing, 2013Co-Authors: Tsun-hsien Wang, Ching-te ChiuAbstract:Image scaling is a widely used method for many applications and numerous approaches have been proposed to this issue. Current approaches that bring promising results while the Edge Curves of the scaled up image still have blurring effect. This paper focuses on the Edge Curve of an image. We propose a simple method for Edge Curve scaling to avoid the disconnect and zigzag problems when using cubic spline interpolation. The scaling results of our method can avoid blurring of the Edge Curve and maintain the Edge contour of an input image.
Chao Zhang - One of the best experts on this subject based on the ideXlab platform.
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The effect of various Edge-Curve types of plain-straight blades for strip tillage seeding on torque and soil disturbance using DEM
Soil and Tillage Research, 2020Co-Authors: Zhao Hongbo, Qingjie Wang, Lu Caiyun, Zheng Zhiqi, Chao ZhangAbstract:Abstract Strip tillage seeders have shown great advantages in seedbed preparation and residue handling in no and minimum tillage seeding. However, soil disturbance and torque requirements need to be further reduced. To address this issue, the simulation in this study used the discrete element method (DEM) to examine the effect of different Edge-Curve geometries on torque requirements and soil disturbance characteristics. Herein, the Edge-Curve geometries include three types of plain-straight blades (Archimedean spiral, logarithmic spiral, and sinusoidal-exponential spiral blades) with four slide-cutting angles of Edge-Curve tip (30°, 40°, 50°, and 60°). The model particle (i.e., ball-ball) stiffness kn was calibrated through a soil bin test, and the optimum value was 6 × 103 N/m. The results showed that the blade rotation angle varied with respect to the slide-cutting angle of the Edge-Curve tip when the soil cutting started and the peak value occurred: the larger the slide-cutting angle was, the earlier the soil cutting began and the peak value appeared. Among the three Edge-Curve types, the Archimedean spiral blade (which had the largest average slide-cutting angle) obtained the highest average torque and the largest number of soil particles thrown upward, whereas the sinusoidal-exponential spiral blade (which had the smallest average slide-cutting angle) obtained the lowest values in both metrics. As the slide-cutting angle of the Edge-Curve tip increased, the average torque requirement decreased and fewer soil particles were thrown upward, indicating that a larger slide-cutting angle was preferred when less soil disturbance was desired.
