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Table 2 Average overall quality index (AOQI) of different methods

From: A de-noising method based on L0 gradient minimization and guided filter for ancient Chinese calligraphy works on steles

Methods AOQI
Zheng’s method [1] 0.6795
Zhang’s method [10] 0.6865
L0 gradient minimization [13] 0.6538
BM3D [17] 0.6802
Our prior work [11] 0.6895
Prior work [12] 0.6905
Proposed method 0.7056