Panoramic Image Correction of Borehole Inner Wall Based on Kirchhoff Circle Detection

Based on the problems of insufficient single visualization and waste of communication bandwidth when uploading images after collecting images in the existing downhole TV systems in the field of geological surveys, a method is proposed to remove the invalid areas of the collected panoramic images of the inner wall of the borehole, and expand and correct the valid areas into Method for the plan view of the inner wall of the drilled hole. First, use the Kirchhoff circle algorithm to detect the invalid black hole information area in the panoramic image of the inner wall of the borehole, and remove it after determining the limit; secondly, use the mathematical method of polar coordinates to delineate the ring limit of the effective area image and expand it into a Trapezoidal diagram; finally, the expanded trapezoidal image is stretched at four corners using the perspective transformation algorithm to restore the plan view of the inner wall of the borehole. Compared with the existing borehole optical imaging system, the present invention can effectively divide the effective area and the invalid area in the panoramic view of the inner wall of the borehole, save the communication bandwidth when uploading the image of the inner wall of the borehole, improve the collection efficiency, and has practical application. value.