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Image Vectorization Expression Method Based on Plane Block Collection

An expression method and plane block technology, applied in the field of image vectorization, can solve the problem of inflexibility of raster image expression, and achieve the effect of good reconstruction effect

Active Publication Date: 2018-05-29
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when we need to do some more complex operations on the image (such as scaling, etc.), the expression of the raster image is not so flexible

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  • Image Vectorization Expression Method Based on Plane Block Collection
  • Image Vectorization Expression Method Based on Plane Block Collection

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Embodiment Construction

[0026] The present invention is described in detail below in conjunction with accompanying drawing.

[0027] The present invention is based on the image vectorization expression method of plane block set, and this method comprises the following steps:

[0028] (1) Input any raster image and the number N of plane blocks;

[0029] (2) connect the pixel points of the raster image and convert it into a spatial triangular grid; specifically include the following steps:

[0030] (2.1) If figure 1 As shown in (a), connect each pixel of the raster image with its four adjacent pixels up, down, left, and right to form a planar quadrilateral grid;

[0031] (2.2) If figure 1 As shown in (b), add a dimension to the position coordinates of each vertex of the grid, and its value is the gray value of the corresponding pixel, and convert the original plane quadrilateral grid into a curved surface quadrilateral grid;

[0032] (2.3) If figure 1 As shown in (c), a side is added to the diagon...

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Abstract

The invention discloses a planar block set based image vectorization expression method and belongs to the technical field of video and image processing. The method comprises the following steps: inputting any raster image information and a planar block number specified by a user. According to an algorithm, firstly image pixel points are converted into a dense curved triangular grid with a mapping method; secondly parameters of a plane where each planar block is located are estimated in combination with a principal component analysis method by utilizing an iterative method according to the triangular grid, so that the planar block can be close to the triangular grid as far as possible; and finally an edge curve of each planar block is extracted and a topologic connection relation among planar blocks is recorded by utilizing a half curved edge structure. A planar block set structure calculated with the method can be well approximate to an original image.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an image vectorization method for expressing an image by using a plane block set. Background technique [0002] With the rapid development of digital image processing technology, various images appear more and more in people's daily work and life. Traditional images are generally raster images, which record the color value of each pixel in a matrix. In this way, we can easily record and display images. However, when we need to do some more complex operations on the image (such as scaling to maintain the definition), the expression of the raster image is not so flexible. If vectorized expression is adopted, the above functions can be realized. In addition, the vectorized expression method has other advantages, such as making the image easier to edit and achieving a certain degree of compressed storage. [0003] Image vectorization is the process of convert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00
CPCG06T9/008
Inventor 童若锋谢昊唐敏
Owner ZHEJIANG UNIV