Rotation error correcting method of CT (Computerized Tomography) scanned images
A CT scanning and error correction technology, applied in the field of image processing, can solve the problems of no image rotation error, correction method, limited calculation accuracy, etc., and achieve the effect of reducing the amount of calculation and complexity and improving the accuracy
Inactive Publication Date: 2013-07-10
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[0003] At present, in the correction methods for rotating images, the image rotation angle is obtained by inputting the angle search range and gradually reducing the angle distance in the Cartesian coordinate system. This type of method has a large amount of calculation and limited calculation accuracy. The two scanning images acquired at different displacement times during the scanning microscopic displacement experiment are not exactly the same due to the difference in oil-water distribution, so there is currently no rotation error correction method for this type of image
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[0037] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0038] The present invention carries out the steps of rotation error correction as follows:
[0039] Select two CT scanning images at the same scanning position at different displacement times;
[0040] Select an appropriate threshold, binarize the image, and select a specific rock matrix in the image as a reference for subsequent correction methods;
[0041] Convert the obtained binary image from a rectangular coordinate image to a polar coordinate image;
[0042] Count the coordinates of the pixels occupied by each rock matrix in the polar coordinate image, and calculate the coordinates of the center of mass of the rock matrix;
[0043] Comparing the translation of the abscissa of the centroid of the same rock matrix in the polar coordinate images at different displacement times, the relative rotation angles of the two original CT scan images are ...
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The invention relates to a rotation error correcting method of CT (Computerized Tomography) scanned images. The rotation error correcting method comprises the following steps of: selecting two CT scanned images on the same scanned position at different displacement moments; selecting a proper threshold value, carrying out binaryzation onto the images, selecting specific rock matrixes in the images as reference substances in a subsequent correcting method; converting the obtained binary images into polar coordinate images from rectangular coordinate images; counting coordinates of the pixel occupied by each rock matrix in the polar coordinate images and calculating mass center coordinates of the rock matrix; comparing translation amount of the same rock matrix mass center in the polar coordinate images at different displacement moments, reversely calculating the relative rotary angles of the two initial CT scanned images; and rotating the initial CT scanned images. The rotation error correcting method of the CT scanned methods are used for converting the rectangular coordinate image into the polar coordinate images and converting the rotation problem into a translation problem, so that the computation quality and the complexity of the image rotation correction are reduced, and the image correction precision is improved.
Description
technical field [0001] The invention relates to an image processing technology, in particular to a method for correcting image rotation errors at different displacement moments during a CT scan microscopic displacement experiment in the field of oil field development. Background technique [0002] During the CT scan microscopic displacement experiment, when the core model is scanned at different displacement times, the angles of the core model placed on the rotating bracket of the CT machine may be different, which leads to two different displacement times The scanned image will be rotated at a certain angle, figure 1 with figure 2 They are the No. 1 scanning images obtained at the end of water injection of 1 times the pore volume and 2 times the pore volume respectively in a microscopic displacement experiment. It can be seen that the basic features of the two images are roughly the same but there is a certain angle of rotation, which gives CT The post-segmentation proce...
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Inventor 侯健邱茂鑫宫法明张言辉周康韦贝王容容吴金涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)