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Terahertz image processing method and system

An image processing and terahertz technology, applied in the field of terahertz image processing, can solve problems such as lack of versatility and intuition, complex mathematical operations, etc.

Inactive Publication Date: 2015-04-15
深圳市太赫兹科技有限公司
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Problems solved by technology

[0003] The technical problem solved by the present invention is to construct a terahertz image processing method and system, which overcomes that the prior art terahertz image processing usually involves complex mathematical operations, and lacks versatility and intuition

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  • Terahertz image processing method and system

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0023] Such as figure 1 Shown, the specific embodiment of the present invention is: provide a kind of terahertz image processing method, comprise the steps:

[0024] Median filter denoising: first perform median filter on the original terahertz image, and then perform linear gray scale stretching on the image in the gray scale range of 0-255.

[0025] The specific implementation process is as follows: Median filtering is a commonly used nonlinear smoothing filter, and its basic principle is to replace the value of a point in a digital image with the median value of each point in a field of the point. Let f(x,y) be the gray value of the image pixel, and the filter window is defined as the median filter of A as follows:

[0026] f^(x,y)=MED{f(x,y)}(x,y)∈A (1)

[0027] Then do linear grayscale stretching in the grayscale range of 0-255 to obtain a...

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Abstract

The invention relates to a terahertz image processing method and system. The processing method comprises the following steps: conducting median filtering on a terahertz image for noise reduction; conducting nonlocal filtering, frequency domain high-pass filtering, edge processing and superposition processing, wherein the nonlocal filtering adopted is different from domain filtering adopted in certain methods, the nonlocal filtering has better resistance against noise, and the part filtered out contains less geometrical structural information; while domain filtering can filter out speckle noise to a certain degree, edge information is more obscure.

Description

technical field [0001] The present invention relates to a terahertz image processing method and system, in particular to a terahertz image enhancement processing method and system. Background technique [0002] There are many reasons that affect the resolution and clarity of terahertz images, one of which is that the intensity of terahertz radiation changes due to laser power jitter, which leads to jitters in the gray distribution of terahertz images, that is, there are obvious bright spots. And at the same time, it may be accompanied by the problem that the image background is dark and the contrast is not strong. This patent uses nonlocal filtering and Butterworth frequency domain filtering to realize denoising and enhancement of terahertz images. There are many methods for noise reduction and enhancement of terahertz imaging. Commonly used are noise reduction, edge detection and enhancement based on wavelet transform. However, these methods usually involve more complex ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 刘艺青
Owner 深圳市太赫兹科技有限公司
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