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The Research on Vectorization of Handcraft Drawing Complex Carving Pattern

Author: WeiBing
Tutor: ChenYuTuo
School: Central South University of Forestry Science and Technology
Course: Applied Computer Technology
Keywords: Vectorization Freeman chain code Corner Curve fitting Cubic Bezier Curves
CLC: TP391.41
Type: Master's thesis
Year: 2007
Downloads: 37
Quote: 1
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Abstract


Vectorization is a hot research topic in today's computer graphics, pattern recognition, and CAD / CAM field. Currently, most of the research is the vectorization of engineering drawings. Vectorization of hand-painted carving patterns, due to its complex and volatile, the curve is not smooth, are susceptible to noise interference characteristics, allows researchers to small, the effect is not ideal. Firstly, the characteristics of the hand-painted carving patterns, and then according to their characteristics and their vectorization process. Complex hand-painted carving pattern vector process is divided into four phases: image preprocessing; contour tracking and line segments; curve fitting; exchange of vector data. Image preprocessing stage, first, the image denoising. In the course of the study, a comparative study of four commonly used denoising method; then, after the denoising image binarization processing. In this thesis, two better binarization algorithms, and performance analysis; Finally, the binary image contour extraction. According to the hand-painted complex carved motifs often contain line patterns and characteristics of the regional block pattern proposed an adaptive method to distinguish lines pattern and regional block pattern, and region filling algorithm to achieve a regional block pattern boundary extraction; extracted region block boundary, the image thinning the whole image of the contour extraction. Contour tracking based on the pixel adjacency outline of the image is divided into a number of lines, and then extract the coordinates of these lines according to Freeman chain code. In order to reduce the amount of calculation when the vectorization, the corners of this article using the extracted realized segmented lines, thus the image contour is represented as a series of line segments. Curve fitting, for now mostly use the straight-line approximation of curves and round and can not get a smooth curve, we use cubic Bezier curve curve segments fitting smooth curve. The threshold value is set in the process of the fitting, based on curve fitting to the original data points of the line segment offset further subdivided pair of line segments, to achieve the control of the fitting precision. Fitting curve segments, and propose a new method for smooth connection of a segmented curve. Experimental results show that this method has hand-painted complex carved motifs vectorization algorithm complexity and low vectorization better advantage, there is a wide range of practical. Save graphics in vector processing into a DXF file formats, you can call in the CAD / CAM-aided design and manufacturing software, edit and modify. The end of the paper, hand colored engraved pattern vector system design studies and propose a solution.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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