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Image amplification processing method based on edge direction difference

A technology of edge direction and processing method, applied in image data processing, image enhancement, graphics and image conversion, etc., can solve problems such as low computing efficiency, jaggedness, blurring, etc., and achieve the effect of high speed, good quality, and great practical value

Active Publication Date: 2012-09-19
HENAN UNIV OF SCI & TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide an image enlargement processing method based on edge direction difference to solve the problem of jagged or blurred edges after image enlargement and low operation efficiency

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Embodiment Construction

[0013] If three points in space are known, a plane can be constructed, and the present invention performs interpolation according to this principle. Its mathematical expression is: f(x,y)=ax+by+c (1)

[0014] in, a, b, c is an undetermined coefficient. x, y The coordinates corresponding to the pixel point, f(x,y) is the color value of the pixel.

[0015] Using the four vertices corresponding to the pixel to be interpolated, the pixel to be interpolated must fall within the grid of a certain four-neighborhood of the original image, that is, the four-neighborhood of the original image with the closest distance to the pixel to be interpolated, (here, we choose computer equipment The coordinate system, that is, the horizontal direction to the right is the positive direction of the x-axis, and the vertical direction is the positive direction of the y-axis, and the origin is located in the upper left corner), then the coordinates of a pixel to be interpolated after being enlarg...

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Abstract

The invention relates to an image amplification processing method based on the edge direction difference. The processing method comprises the following steps of: amplifying an original image for k times, scanning the original image by forward scanning, and determining projection coordinates of four top points on a second-dimensional plane, wherein the four top points are not on the same plane and used for structuring the plane; judging the degree of the absolute difference of pixel diagonal lines of four top points; ensuring that the direction with lesser absolute difference of the diagonal line belongs to the edge direction, using the direction with greater absolute difference of the diagonal line as a border line, structuring a plane respectively; calculating the color value of the pixel to be plugged according to the formula and filling. According to the image amplification processing method based on the edge direction difference provided by the invention, the problem of sawtooth or fuzzy phenomenon appeared at the edge after amplifying the image or low operation efficiency is solved; when the image is amplified, the processing method is quick in speed and good in quality and has significant practical value.

Description

technical field [0001] The invention belongs to the technical field of digital image processing, and relates to an edge direction-based interpolation method in the process of enlarging digital images, which is mainly used in the processing of enlarged local small images in intelligent recognition. Background technique [0002] Image magnification is a very important basic operation in image processing, and it is widely used in the Internet, medical image processing, digital TV and many other digital devices such as mobile phones and cameras. For the problem of image enlargement, researchers at home and abroad have proposed various types of image enlargement methods according to different mathematical models, such as: nearest neighbor interpolation, bilinear interpolation, high-order polynomial interpolation, fractal interpolation, and methods based on wavelet transform, etc. . The nearest neighbor interpolation is the simplest and the processing speed is the fastest, but be...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T3/40
Inventor 孙士保李春爱宋晓莉王志强陈永刚段建辉
Owner HENAN UNIV OF SCI & TECH
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