Method for calibrating uneven brightness of microcosmic oil displacement experiment image

Abstract

The invention discloses a method for calibrating uneven brightness of a microcosmic oil displacement experiment image. The method comprises the following steps of adjusting the size of the microcosmic oil displacement experiment image, dividing the microcosmic oil displacement experiment image into a plurality of sub units, storing the grey information of the sub units of the image respectively, solving the background grey value of each sub unit of the image, further obtaining the background light source image of the whole image by extension, subtracting the background light source image grey level by an original image grey level to obtain an image without illumination, and carrying out illumination compensation on the image without the illumination to obtain a brightness calibration image. According to the method for calibrating the uneven brightness of the microcosmic oil displacement experiment image, the background light source image is solved reversely, the uneven brightness phenomenon of the image generated due to uneven illumination in a microcosmic etching module oil displacement experiment process is eliminated, the calibration precision of the image with uneven brightness is improved, and a basis is established for subsequent accurate segmentation of the image. Meanwhile, in the calibration process, the image is divided into a plurality of small units, average processing is carried out on each unit, calculation amount is reduced greatly, and the efficiency of image calibration is improved.

Description

technical field [0001] The invention relates to an image processing technology, in particular to a method for correcting uneven brightness of an image during an oil displacement experiment of a microscopic etching model in the field of oil field development. Background technique [0002] Acquisition of experimental images is the ultimate goal of micro-etching model oil displacement experiments, and the quality of experimental images directly determines whether the experimental analysis results are correct or not. In the actual operation process, since the light source under the microscopic etching model is often not directly facing the center of the model or the light emitted by the light source is not perpendicular to the surface of the model, the obtained microscopic experimental image will have uneven brightness. The image segmentation operation will produce a large error, such as figure 1 and figure 2 shown. Therefore, for images with non-uniform brightness, brightne...

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Problems solved by technology

[0003] At present, in the correction methods used for image brightness, the brightness of the image is reduced or compensated by combining the image acquisition device. For the microscopic oil displacement experiment of the etching model, due to the small size of the light source and the core model, this method The cost is high and the operability is poor

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