面泊松融合结合色彩变换的无缝纹理辐射处理

Face-wise Poisson blending with color transfer in seamless texturing

目的消除3维模型纹理接缝上的辐射差异,实现接缝处色彩的自然、连续的过渡。方法本文在标准的泊松融合(Poisson blending)基础上,结合色彩变换技术(color transfer),提出了一种新的以面为基元的泊松融合无缝纹理辐射处理方法。首先以影像上的纹理三角形为处理单元,以色彩变换参数为未知数,根据模型的三角网边邻接拓扑关系建立泊松方程组,然后全局最小二乘解求局部色彩变换参数,最后进行全局最优解下的局部色彩变换。结果既保证了色彩的均匀过渡,又能更好地改正影像间的整体色差。结论相比使用标准的像素级泊松融合方法进行无缝纹理处理,本文方法拥有计算上的优势,更适合于复杂模型的处理,且有更好的整体色差改正与过渡效果。理论分析和大量实验表明了本文方法的优越性。

Objective Removing photometric discrepancy on seam-lines of 3D model textures, and achieve natural and con- tinuous color transition across the texture seam-lines. Method We propose a new photometric processing method of face-wise Poisson blending, which is based on the standard Poisson image editing approach combined with color transfer techniques. First, we regard the texture triangle on images as the processing unit, and the color transfer parameters as the unknowns; then the Poisson equations set is constructed according to the edge adjacent topology on the triangular mesh; af- ter that, the color transfer parameters are resolved using global least square ; at last, color correction is locally performed with the global solution. Result Our method assures the smooth and continuous color transition besides the seams and simul- taneously remoral of the global color difference between images more effectively. Conclusion Compared with standard pixel- wise Poisson blending method, our procedure has the advantages in computing and implementation, which is more appro- priate for seamless texture processing on complicated models. Even more, our approach has a better effect in global color difference correction and transition. Theoretical analysis and experiments prove the superiority of our method.