A Nearest Opposite Contour Pixel Based Thinning Strategy for Character Images

2017 ◽  
pp. 123-140
Author(s):  
Soumen Bag
Keyword(s):  
Local Features ◽  
Difficult Problem ◽  
Post Processing ◽  
Vector Form ◽  
Handwritten Character ◽  
True Shape ◽  
Shape Characteristics

Thinning of character images is a big challenge. Removal of strokes or deformities in thinning is a difficult problem. In this paper, we have proposed a nearest opposite contour pixel based thinning strategy used for performing skeletonization of printed and handwritten character images. In this method, we have used shape characteristics of text to get skeleton of nearly same as the true character shape. This approach helps to preserve the local features and true shape of the character images. The proposed algorithm produces one pixel-width thin skeleton. As a by-product of our thinning approach, the skeleton also gets segmented into strokes in vector form. Hence further stroke segmentation is not required. Experiment is done on printed English and Bengali characters and we obtain less spurious branches comparing with other thinning methods without any post-processing.

Solid Modeling Methods and Wire-Cutting Process Simulation of Non-Circular Gears

2011 ◽  
Vol 86 ◽  
pp. 730-734
Author(s):  
Min Zhang ◽  
De Yong Kong ◽  
Jia Li Zhao ◽  
Yong Ping Liu ◽  
Chi Bing Hu
Keyword(s):  
Process Simulation ◽  
Design Theory ◽  
Tool Path ◽  
Solid Modeling ◽  
Difficult Problem ◽  
Cutting Process ◽  
Post Processing ◽  
Third Order ◽  
Modeling Methods ◽  
Wire Cutting

Non-circular pitch curves is not a circle, the design and simulation of non-circular are complexity and difficulty. Based on the design theory and wire cutting theory of non-circular gears, main introducing to create parameter model of third-order non-circular gear based on Pro/E drawing module. Using Pro/E manufacturing module cut third-order non-circular gear by line. Include using Pro/E creates third-order gear machining tool path, set tool and process parameters, process simulation tool process of post-processing analysis and generate post-processing procedures which NC machine tool need. And analyzing the results of processing, then shows that the solid modeling methods and cutting process simulation are correct and highly precision, solve the difficult problem about non-circular gear solid modeling and machining simulation.

SKELETONIZING CHARACTER IMAGES USING A MODIFIED MEDIAL AXIS-BASED STRATEGY

2011 ◽  
Vol 25 (07) ◽  
pp. 1035-1054 ◽  
Author(s):  
SOUMEN BAG ◽  
GAURAV HARIT
Keyword(s):  
Medial Axis ◽  
Post Processing ◽  
Vector Form ◽  
Local Character ◽  
Thinning Algorithms

In this paper we propose a thinning methodology applicable to character images. It is novel in terms of its ability to adapt to local character shape while constructing the thinned skeleton. Our method does not produce many of the distortions in the character shapes which normally result from the use of existing thinning algorithms. The proposed thinning methodology is based on the medial axis of the character. The skeleton has a width of one pixel. As a by-product of our thinning approach, the skeleton also gets segmented into strokes in vector form. Hence further stroke segmentation is not required. We have conducted experiments with printed and handwritten characters in several scripts such as English, Bengali, Hindi, Kannada and Tamil. We obtain less spurious branches compared to other thinning methods. Our method does not use any kind of post processing.

On the Shape of Field-Ion Emitters

1976 ◽  
Vol 34 ◽  
pp. 520-521
Author(s):  
H.C. Eaton ◽  
B.N. Ranganathan ◽  
T.W. Burwinkle ◽  
R. J. Bayuzick ◽  
J.J. Hren
Keyword(s):  
Grain Boundary ◽  
Spherical Shape ◽  
Theoretical Strength ◽  
Evaporation Process ◽  
Field Evaporation ◽  
Geometric Information ◽  
Field Ion Microscopy ◽  
Considerable Error ◽  
True Shape ◽  
Ion Microscopy

The shape of the emitter is of cardinal importance to field-ion microscopy. First, the field evaporation process itself is closely related to the initial tip shape. Secondly, the imaging stress, which is near the theoretical strength of the material and intrinsic to the imaging process, cannot be characterized without knowledge of the emitter shape. Finally, the problem of obtaining quantitative geometric information from the micrograph cannot be solved without knowing the shape. Previously published grain-boundary topographies were obtained employing an assumption of a spherical shape (1). The present investigation shows that the true shape deviates as much as 100 Å from sphericity and boundary reconstructions contain considerable error as a result.Our present procedures for obtaining tip shape may be summarized as follows. An empirical projection, D=f(θ), is obtained by digitizing the positions of poles on a field-ion micrograph.

APPLYING THE ISF TECHNOLOGY TO PRODUCE THE CAR PART MODELS

2010 ◽  
Vol 13 (4) ◽  
pp. 91-98
Author(s):  
Tuan Dinh Phan ◽  
Binh Thien Nguyen ◽  
Dien Khanh Le ◽  
Phuong Hoang Pham
Keyword(s):  
Rapid Prototyping ◽  
Incremental Sheet Forming ◽  
Cad Model ◽  
Post Processing ◽  
Technological Parameters ◽  
Batch Production ◽  
Complex Products ◽  
3D Cad ◽  
Real Size ◽  
Single Batch

The paper presents an application the research results previously done by group on the influence of technological parameters to the deformation angle and finish surface quality in order to choose technology parameters for the incremental sheet forming (ISF) process to produce products for the purpose of rapid prototyping or single-batch production, including all steps from design and process 3D CAD model, calculate and select the technological parameters, setting up manufacturing and the stage of post-processing. The samples formed successfully showed high applicability of this technology to practical work, the complex products with the real size can be produced in industries: automotive, motorcycle, civil...

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