基于比重漂移的唐卡破损区域分割新方法

破损区域分割是数字化修复唐卡的前提。针对在局部区域内破损区域和邻域灰度值存在差别这一特点,提出了基于比重漂移的唐卡破损区域分割方法。首先获取局部块内各个像素的比重度,然后选取合适的阈值实现破损区域的分割,最后去除伪破损区域,得到最终的分割结果。通过对常见的几种破损唐卡进行分割实验,验证了方法的有效性和鲁棒性。另外所提方法对壁画和自然图像的分割也具有一定的有效性,说明了其应用的广泛性。

A new method for segmenting damaged regions of Thangka based on the proportion drift

Segmenting damaged regions is premise of digital inpainting of Thangka. According to the characteristic that the gray value of damaged regions and that of their neighborhood regions are different in the local area,a new segmentation method based on the proportion drift is proposed. Firstly,the proportion of pixels in the local area was gained; secondly,the appropriate threshold was selected to segment damaged regions; finally,the pseudo damaged regions in the previous segmentation result were removed and then the final segmentation result was obtained. Experimental results showed that the proposed method has the effectiveness and robustness through segmenting several common damaged Thangka. In addition,the proposed method can also segment murals and natural images validly,which illustrates the breadth of application of the method.