Downhole image processing method based on improved bilateral filtering

A bilateral filtering and image processing technology, applied in the field of image processing, can solve problems such as halo phenomenon, enhancement, loss of image details, etc., to avoid halo and graying phenomenon, enhance brightness and contrast, and improve image contrast. Effect

Pending Publication Date: 2019-09-27
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology

[0004] The single-scale Retinex algorithm is simple and easy to implement, but it has the following disadvantages: it amplifies the image noise while enhancing the image details; it is prone to halo phenomenon in places with strong light and dark changes; the enhanced image contrast is low and there is graying phenomenon
Based on the bilateral filtering and Retinex image enhancement algorithm, the bilateral filtering method can better remove the image noise caused by environmental factors in the mine, and at the same time eliminate the halo phenomenon, but it will cause the overall graying of the image and the loss of image details

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  • Downhole image processing method based on improved bilateral filtering
  • Downhole image processing method based on improved bilateral filtering
  • Downhole image processing method based on improved bilateral filtering

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[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 accompanying drawings and specific implementation cases.

[0032] In order to verify the effectiveness of the algorithm, experiments were carried out using a computer with Windows 8.1 64-bit operating system, Core i5 CPU, and 8GB memory, and four underground images were selected for enhanced processing in the Code::Blocks IDE environment. In the experiment, estimate the parameters of the illumination image: p=5 (filtering window size is 11×11), brightness difference scale parameter σ l =0.001; sub-area denoising parameters: bright area p=1, brightness difference scale parameter σ l =0.001, distance difference scale parameter σ d =0.001, dark area p=2, brightness difference scale parameter σ l =0.005, distance difference scale parameter σ d = 0.001. The single-scale Retinex algorithm (SS...

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Abstract

The invention discloses a downhole image processing method based on improved bilateral filtering. According to the method, improved bilateral filtering is adopted to estimate an illumination image, an Otsu threshold segmentation method is adopted to obtain a reflection image threshold, bilateral filtering is adopted to perform denoising processing of different degrees on bright and dark areas, segmented linear transformation is adopted to enhance and suppress the bright and dark areas, and the image contrast is improved. Experimental results show that the brightness and contrast of the coal mine underground low-illumination image can be effectively enhanced, and noise can be effectively removed while underground dark region details are ensured. The problems of halo and ash flooding and noise amplification in the traditional method are avoided.

Description

Technical field: [0001] The invention belongs to the field of image processing, in particular to an underground image processing method based on improved bilateral filtering. Background technique: [0002] Due to the particularity of the downhole working environment, in the process of monitoring downhole production, the quality of the monitoring image is often affected by the harsh downhole environment, with low contrast, low illumination, blurred details in dark areas and a lot of noise. , so it is necessary to perform some processing on the downhole image to enhance the visual effect of the image. [0003] The traditional methods of image enhancement include histogram equalization method, dark channel prior method, unsharp mask method, etc. The histogram equalization method is simple and efficient, and the processing speed is fast, but at the same time, the noise of the image is amplified in the process of processing, and the image details are blurred and the contrast is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/11G06T7/136
CPCG06T5/002G06T5/005G06T7/11G06T7/136G06T2207/20028G06T2207/20021
Inventor 常戬孔奥阳
Owner LIAONING TECHNICAL UNIVERSITY
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