Adaptive enhancement method of rock boring image
An adaptive enhancement and image technology, applied in the field of image processing, can solve the problems of information distortion, uneven exposure, low utilization rate and benefit of rock mass drilling, and achieve the effect of improving contrast
Inactive Publication Date: 2017-02-01
HOHAI UNIV CHANGZHOU
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Problems solved by technology
In geotechnical engineering construction, a large number of geological boreholes are generally required for engineering geological exploration, but most of the geological boreholes drilled at a huge cost are only used to record (or acquire Cores required for indoor tests), currently there are not many equipments for rock mass mechanical performance testing using rock mass drilling, resulting in relatively low utilization rate and benefit ratio of these precious rock mass drilling
[0003] Because the rock mass exists in a certain geological environment, not only its stress environment is complex, but also contains randomly developed spatially discrete structural planes, and its engineering mechanical properties are difficult to grasp.
Due to the limitation of shooting conditions, rock drilling images usually have uneven exposure, which makes the details of the bright areas with large exposure in the image distorted, and the details of dark areas with low exposure are difficult to show
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[0017] Relevant detailed content and technical scheme of the present invention, cooperate drawing description as follows:
[0018] A method for self-adaptive enhancement of a rock borehole image of the present invention, the specific steps are as follows:
[0019] (1) Obtain rock drilling images;
[0020] (2) Perform homomorphic filtering on the acquired original rock drilling image:
[0021] Homomorphic filtering is a method to compress the dynamic range of an image and enhance the image contrast in the frequency domain. When the spatial domain image is expressed in the form of f(x,y) two-dimensional illumination function, the two-dimensional illumination function f(x,y) can be characterized by two components: the total amount of incident light source i(x,y) and object reflection The total amount of light r(x,y), that is, f(x,y)=i(x,y) r(x,y) formula (1)
[0022] Among them, x and y are image coordinate points in space domain.
[0023] The intensity of light is generally ...
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The invention discloses an adaptive enhancement method of a rock boring image. First of all, the problem of exposure nonuniformity is processed by use of a homomorphic filtering mode. Then, a high-frequency portion coefficient and a low-frequency portion coefficient are decomposed by performing Curvelet transformation on an original image and an image after homomorphic filtering. A high-frequency portion of the original image adaptively determines a noise threshold by use of a transformation coefficient, adaptive enhancement processing is performed on the portion, higher than the threshold, of the high-frequency portion of the original image, and at the same time, the portion lower than the threshold is inhibited; and the low-frequency portion of the original image carries out coefficient matching with a low-frequency coefficient of the image after the homomorphic filtering by use of a histogram matching method. Finally, an enhanced image is obtained through Curvelet inverse transformation. The contrast of the rock boring image can be adaptively improved, and some image detail information of an overexposure portion or an overdark portion is better displayed.
Description
technical field [0001] The invention relates to an adaptive enhancement method of rock drilling images, belonging to the technical field of image processing. Background technique [0002] Since my country's reform and opening up, economic development has achieved great results, and geotechnical engineering survey has shown a good development situation. In particular, my country's geotechnical engineering survey technology has continued to innovate, and the requirements for geotechnical engineering survey quality and technology have become higher and higher. Geotechnical engineering survey is a project to identify, analyze and evaluate the geological conditions and geotechnical engineering characteristics of the construction site according to the needs of engineering construction. In geotechnical engineering construction, a large number of geological boreholes are generally required for engineering geological exploration, but most of the geological boreholes drilled at a huge...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G06T5/00G06T5/40
CPCG06T5/40G06T2207/20008G06T2207/20048G06T2207/20192G06T5/92G06T5/73
Inventor 何飞佳李庆武韩辉朱文青
Owner HOHAI UNIV CHANGZHOU