Application And Research On Sequential Annular Image Processing Technology

Along with the development and progress of the scientific technology, the methods and means of geological investigation have been improved continually. As an indispensable technology for detecting the mines, we usually utilize the panoramic camera technology to detect the mines and to obtain the important geological information, such as the information of terrane and crevice. And in the light of the specialties of geological information, it can facilitate and assist the research of geological structure, by using various kinds of digital image processing methods to get the panoramic image which can reflect the important geological information. At the present time, people pay more and more attention to the research of panoramic image technology, especially focusing on the research of panoramic annulus image technology.This paper is based on the ideas of borehole detecting mines and the specialties of panoramic annulus image technology, with the borehole wall as the object of study, and depth as the step length of collecting images. And firstly, project the cylinder space of the entire section(360°) of the borehole wall on the two-dimensional plane as annulus images, which will be expanded and stored up quickly. Then get the actual panoramic images of the borehole by the series of operations of image registering and image fusion, in order to obtain the important and clear geological information such as stratum, lithology, hole and crevices. And meanwhile, simulate the borehole wall three-dimensionally by using the OpenGL technology and re-present the three-dimensional images of underground borehole wall, in order to observe roundly. Thus, in this way, it can be fully prepared for the further understanding of the images, with the eminent values in both theory and engineering.Here are the main contents of the paper:①On the basis of the researches for panoramic image technology, borehole camera technology and digital image processing technology, this paper primarily makes the research on the series annulus image processing technology. According to the theory of borehole camera technology, get the images of the entire section(360°) of the borehole wall by using reflector of conical face, and obtain the annulus images on the two-dimensional plane.②Since there are distortions existing in the annulus images which are collected, the effective conformation on the center of a circle and radial direction will be the important premise for expanding and correcting of the images. Combined with the characteristics of the image system, the improved seed filling is designed to obtain the center of the circle and the radial direction exactly.③Since there are certain deformities in the transverse and radial section of the annulus images, we also need the rectification on them. This paper puts forward the method of regarding certain degree as step length to scan the every concentric circle, in order to unfold the annulus image to the rectangle image.④Based on the intensive research on the mature theory of image stitching and actual requirements in this paper, the grid matching method is designed to register the adjacent images. And the method of fading in and out is also adopted to joint the adjacent images smoothly. In this way, the image resolution ratio has been enhanced.This paper designs and carries out the whole borehole image system, which makes the necessary processes for the series annulus image by the method of computer automatic processing and user interaction. A great amount of testing has already proved its stability and reliability.