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Digital image magnification method capable of maintaining edge features

A technology of digital images and edge features, applied in the field of image scaling in digital image processing, to achieve the effects of accurate solution, increased correlation, and convenient operation

Inactive Publication Date: 2015-07-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The basic idea of ​​the explicit method is to explicitly express the edge information of the image and guide the interpolation process to adjust the interpolation coefficient along the edge direction, but this method is easily affected by factors such as noise and blur

Method used

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  • Digital image magnification method capable of maintaining edge features
  • Digital image magnification method capable of maintaining edge features
  • Digital image magnification method capable of maintaining edge features

Examples

Experimental program
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Embodiment Construction

[0046] Below in conjunction with accompanying drawing and embodiment for further explanation:

[0047] Such as figure 1 Shown, based on edge-preserving image enlargement, its steps are described as:

[0048] Step 1: Determine each pixel to be enlarged and the corresponding unit to be enlarged and the amplification unit centered on the pixel to be enlarged;

[0049] Step 2 is to determine the surface fitting area of ​​each pixel in the outermost peripheral pixels of the amplifying unit, and resample the pixels in the outermost circle of the amplifying unit;

[0050] Step 3 utilizes the spatial adaptive method to determine the coefficient of the middle pixel in the amplifying unit;

[0051] Step 4 determines the middle pixel of the amplification unit by using the least squares method with constraints;

[0052] Step 5 extracts high-resolution pixels in the upscaling unit.

[0053] Determination of the unit to be amplified and the amplified unit of each pixel to be amplified i...

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Abstract

The invention particularly discloses a digital image magnification method capable of maintaining edge features. The method includes the following steps: step one, determining a to-be-magnified unit and a magnified unit of each to-be-magnified pixel; step two, determining surface fitting areas according to pixels and positions corresponding to the pixels in the to-be-magnified units, and sampling the pixel at the outside circle of the magnified units again; step three, determining the coefficient of a middle pixel of the magnified units through a space adaptive method; step four, determining the middle pixel of the magnified units through a constrained least square method; and step five, extracting high resolution pixels in the magnified units. The method has the advantages that not only the edge features of images can be maintained, but also the operation is convenient.

Description

technical field [0001] The invention belongs to the image scaling field of digital image processing, in particular to a digital image enlarging method for maintaining edge features. Background technique [0002] Spatial resolution is one of the most important reference standards for digital images. Although the resolution of raw images obtained by, for example, digital cameras or scanners has steadily increased, there are always new technologies that require higher spatial resolution. For example, in order to observe a small pathological change area in the image in computer-aided diagnosis, it is necessary to enlarge the pathological area; in order to adapt to the playback on high-definition TV or monitor, it is necessary to up-convert the SD video frame. In addition, image magnification plays a beneficial or even irreplaceable role in some fields such as computer vision, surveillance, and remote sensing. [0003] The most basic method of image scaling is pixel replication...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T3/40
Inventor 周元峰郭莹莹张彩明
Owner SHANDONG UNIV
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