CAJ | 학술논문

通过透视变换和四边形八节点形函数变换2种平面变换方法即可建立影像像素与展平坐标系之间的关系，生成基于影像的展开图，提出一种基于形函数的隧道衬砌影像展平变换方法。通过数值模拟测试，得出展平照片的误差分布以及不同拍摄位置对误差的影响。最后通过案例给出方法实际应用的效果。结果表明：基于形函数变换的展平方法反需要衬砌表面照片及照片中8个控制点的展平坐标即能建立隧道影像与展开平面之间的坐标关系。该方法所产生的误差很小，具有较高的实用性。
통과투시변환화사변형팔절점형함수변환2충평면변환방법즉가건립영상상소여전평좌표계지간적관계，생성기우영상적전개도，제출일충기우형함수적수도츤체영상전평변환방법。통과수치모의측시，득출전평조편적오차분포이급불동박섭위치대오차적영향。최후통과안례급출방법실제응용적효과。결과표명：기우형함수변환적전평방법반수요츤체표면조편급조편중8개공제점적전평좌표즉능건립수도영상여전개평면지간적좌표관계。해방법소산생적오차흔소，구유교고적실용성。
An image transform method for flattening tunnel lining photo was proposed in this paper based on shape functions transform.It would be convenient to build tunnel lining expansion plan on the basis of flattened image, for it only use two plane transform methods i.e.,perspective transform and eight nodes shape functions trans-form.Feasibility of the method was validated through numerical simulation.Meanwhile,the errors distribution of flattened image and the influence of errors at different shot position were also obtained.Finally,examples were given to show the effect of the method utilized the in practical application.The results show that,based on flat-tening of shape functions transform,the coordinate relationship between tunnel photos and the flattening plane can be established with tunnel lining surface photo and flattening coordinates of eight control points of photo.The error of this method is small,which shows good practicality.