%0 Journal Article
%T FORMULATION MECHANISM OF HALF-WHITE BLACK CIRCLE IMAGES OF ROCK DENSITY DAMAGE INCREMENT WITH CT AND ITS REGISTRATION AND CORRECTION<br>岩石CT密度损伤增量图像“阴阳环”现象的形成机制及其配准校正
%A FAN Liuming
%A MAO Liming
%A DING Weihua
%A <br>范留明
%A 毛黎明
%A 丁卫华
%J 岩石力学与工程学报
%D 2007
%I 
%X Rock density damage increment with CT can be obtained by subtracting CT number of the undisturbed rock samples from that of the loaded rock samples.However,the special phenomenon may come into being when density damage increment data are translated into grey images.In such CT images,the circular contour line of rock samples is divided into two half circles.The half circle is white,and the other one is black.Such contour line of rock samples is called half-white black circle in this paper.In order to discover the information mechanism of the phenomenon,a group of CT test data,which are from the same scanning section of a sandstone sample at the four different stress steps,are used to analyze the CT number distribution.The analytical results show that there is the small offset between CT images,which is the reason that the half-white black circle phenomenon can be found in density damage increment images.After the small offset is corrected by registration processing,this phenomenon disappears.
%K rock mechanics
%K rock CT images
%K density damage increment
%K half-white black circle
%K image offset
%K CT number distribution<br>岩石力学
%K 岩石CT图像
%K 密度损伤增量
%K 阴阳环
%K 图像错位
%K CT数分布
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=D3421FAA1A0A0F0C&jid=35E747D791A1346351AFB523B7FA35CB&aid=EE695AAE0F9A7CA8&yid=A732AF04DDA03BB3&vid=96C778EE049EE47D&iid=38B194292C032A66&sid=41A78CBB5BAB6860&eid=6A9657F54F754BF6&journal_id=1000-6915&journal_name=岩石力学与工程学报&referenced_num=0&reference_num=15