Interpolation Correction Method of Arc Image Based on Geometric Structure

In order to realize the detection of wellbore cracks, this paper studies the coordinate correspondence between the known pixels of the undistorted image and the corresponding pixels of the distorted image, and designs a column supplement correction method by using the image interpolation method. The image of the wellbore is obtained by using the camera with 120 degrees of view. Firstly, divide the image centered on the center of the circle into n small blocks. The blocks in the middle part of the image is more compressed than the both ends, and the different positions need to be interpolated with unequal quantities. According to the corresponding relationship between the pixel value and the image length, the number of columns needed to add the uneven interpolation to the image is calculated. Finally, the mean method is used to complete the interpolation calculation. The effectiveness of the method is verified by using a simulated wellbore image with a horizontal line resolution of 3024 * 4032.