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Image interpolation enlargement method and device based on triangular grid

A triangle and grid technology, applied in the field of image processing, can solve the problems of blurring image edges, affecting edge quality, affecting image visual effects, etc., to achieve good image edges, improve visual effects, and ensure the effect of quality.

Active Publication Date: 2016-09-21
SHANDONG UNIV
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AI Technical Summary

Problems solved by technology

This type of method is equivalent to a linear filter, which will filter out high-frequency information in the image and affect the edge quality
[0005] Its disadvantage is that because this type of algorithm processes all parts of the image in the same way, it ignores the structural information of the image.
[0008] The disadvantage is that the edge of the image processed by this method is still blurred, which affects the visual effect of the image.

Method used

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  • Image interpolation enlargement method and device based on triangular grid
  • Image interpolation enlargement method and device based on triangular grid
  • Image interpolation enlargement method and device based on triangular grid

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Embodiment Construction

[0031] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0032] Assuming that there is an original surface F(x,y) that can accurately represent the object, then sampling the surface can accurately obtain high-resolution images of different sizes. The invention utilizes the discrete data points of the image to restore the original curved surface. As long as the accurate original surface equation can be obtained, the zoomed image can be obtained very conveniently. Since the original surface is very complex, it is impossible to express it accurately, so we can only construct a fitting surface f(x,y) to approximate F(x,y). The image is evenly divided into several parts, a surface patch is constructed on each part, and the original surface is locally approximated, and then a complete fitting surface is constructed...

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Abstract

The invention discloses an image interpolation enlargement method and device based on a triangular grid, belonging to the field of image processing. The method comprises a step of dividing a quadrilateral grid in an image into a triangular grid according to the edge direction of the image, a step of constructing surface patches in an area corresponding to the triangular grid, a step of adjusting the surface patches, a step of connecting all surface patches and obtaining a fitting surface, and a step of sampling the fitting surface and obtaining a target image. According to the invention, the image is divided into the triangular grid along the edge of the image, a fitting surface patch is constructed in a triangle, then the fitting surface is obtained by using the fitting surface, and finally the fitting surface is sampled to obtain the target image. According to the method and the device, the image edge can be maintained, the quality of the image edge is ensured, and thus the visual effect of the image is improved.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an image interpolation and enlarging method and device based on triangular grids. Background technique [0002] Image scaling technology is an important section in the field of image processing, and plays an important role in many fields. According to the characteristics of human vision, the quality of the edge of the image determines the visual effect of the image to a large extent. So how to effectively maintain the edge structure of the image is very important. The existing image interpolation algorithm is to perform interpolation and enlargement on the quadrilateral grid, which will make the edge part smooth and cause the edge to be blurred. The specific brief description is as follows: [0003] (1) Traditional linear interpolation algorithm [0004] Working principle: weighted average of the pixel values ​​of the pixels around the point to be interpolated to estimate the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/40
CPCG06T3/4023
Inventor 李雪梅徐岚张彩明
Owner SHANDONG UNIV
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