遥感信息
遙感信息
요감신식
2009年
6期
25-27,54
,共4页
特征提取%霍夫交换%数字表面模型,Sobel算子
特徵提取%霍伕交換%數字錶麵模型,Sobel算子
특정제취%곽부교환%수자표면모형,Sobel산자
feature extraction%hough transform%DSM%sobel operator
吸取了Hough变换的"投票"方法,提出一种直线提取的方法,并对DSM影像进行了实验.由于两个点可以确定一条直线,固定一个点,与另一个边缘点共同可以得到一条直线的倾角,通过对倾角进行"投票",可以得到符合条件的直线以及线段的两个端点.以已确定的一条直线的终点为起点,重复以上步骤,直至到达最后一个点.整个计算过程都是对两个已知坐标的点进行计算,计算简单,计算量较Hough变换明显减少,且精度较高.
吸取瞭Hough變換的"投票"方法,提齣一種直線提取的方法,併對DSM影像進行瞭實驗.由于兩箇點可以確定一條直線,固定一箇點,與另一箇邊緣點共同可以得到一條直線的傾角,通過對傾角進行"投票",可以得到符閤條件的直線以及線段的兩箇耑點.以已確定的一條直線的終點為起點,重複以上步驟,直至到達最後一箇點.整箇計算過程都是對兩箇已知坐標的點進行計算,計算簡單,計算量較Hough變換明顯減少,且精度較高.
흡취료Hough변환적"투표"방법,제출일충직선제취적방법,병대DSM영상진행료실험.유우량개점가이학정일조직선,고정일개점,여령일개변연점공동가이득도일조직선적경각,통과대경각진행"투표",가이득도부합조건적직선이급선단적량개단점.이이학정적일조직선적종점위기점,중복이상보취,직지도체최후일개점.정개계산과정도시대량개이지좌표적점진행계산,계산간단,계산량교Hough변환명현감소,차정도교고.
Hough transform is a primary way to detect straight line,but the hough transform has some problems about the accuracy and efficiency.In this paper,we present a method for detecting the building edge lines and perform an experiment on DSM.The method we describe in this paper absorbs the"voting procedure"in hough transform.After getting the edge using sobel operator,and labeling the edge of all buildings.Then identify straight lines of the labeled edge separately.We label the objects and get the edge points'coordinates in sequence.Because two points can determine a line,so if the endpoints are known,we can get the line's slope and the line can be determined by the obliquity which extracted from the voted accumulator.Experimental results indicate that the approach can detect the straight line segment precisely and simply.
