CAJ | 학술논문

针对Phong混合反射模型中漫反射和镜面反射比例难以估算问题，提出一种实用的镜面反射系数及高光指数的估算方法。首先，采用边缘检测与链码跟踪相结合的方法，精确确定可观察到镜面反射的区域的轮廓范围；再利用基于朗伯体反射模型的SFS方法，得到由于存在镜面反射而形成的亮斑的边缘点梯度值，并计算出表示可观察到镜面反射的区域的锥角大小；最后，利用合成图像找出不同镜面反射系数下高光指数与锥角间的关系式，从而实现高光指数的估算。仿真结果表明，该方法能够有效提高SFS的重构精度及普适性。
침대Phong혼합반사모형중만반사화경면반사비례난이고산문제，제출일충실용적경면반사계수급고광지수적고산방법。수선，채용변연검측여련마근종상결합적방법，정학학정가관찰도경면반사적구역적륜곽범위；재이용기우랑백체반사모형적SFS방법，득도유우존재경면반사이형성적량반적변연점제도치，병계산출표시가관찰도경면반사적구역적추각대소；최후，이용합성도상조출불동경면반사계수하고광지수여추각간적관계식，종이실현고광지수적고산。방진결과표명，해방법능구유효제고SFS적중구정도급보괄성。
To exactly estimate the proportion of diffuse reflection and specular reflection of Phong hybrid reflectance model, the practical methods for estimating the coefficient of specular reflection and the index of highlights are proposed. Firstly, the region contour of the area where specular reflection can be observed is exactly extracted by the combined methods of edge detection and chain code tracing. Secondly, the gradient values of the bright spot edge points of the area where specular reflection can be observed are calculated by using shape from shading method base on the Lambertian diffuse model, and the values of the cone angles of the area where specular reflection can be observed are also calculated. Finally, the formulas between the highlights index and the cone angles under the different coefficient of specular reflection are derived using composite image, so the highlights index can be es-timated. Simulation results show that the proposed methods can effectively improve the reconstruction precision and the universal of shape from shading method.