Yi Wang, Shan-Shan Liu, Wei-Qian Zhang, Huai-Yu Cai, Xiao-Dong Chen. Automatic contour extraction algorithm for swept-source optical coherence tomography cornea image [J]. Acta Physica Sinica, 2019, 68(20): 204201-1
- Acta Physica Sinica
- Vol. 68, Issue 20, 204201-1 (2019)
Fig. 1. Flow chart of corneal contour extraction algorithm角膜轮廓提取算法流程图
Fig. 2. Division between high and low SNR (signal-to-noise ratio) regions of corneal image: (a) Smoothing result of standard deviation between columns; (b) division results of high and low SNR regions of corneal image.角膜图像高、低信噪比区域划分 (a) 列间标准差平滑结果; (b) 角膜图像高、低信噪比区域划分结果
Fig. 3. Contour extraction results of high SNR region: (a) Preliminary extraction result of contour points; (b) accurate extraction result of contour points.高信噪比区域的轮廓提取结果 (a) 轮廓点初步提取结果; (b) 轮廓点精确提取结果
Fig. 4. Extraction process of the overall cornea contour: (a) Processing result by OTSU algorithm; (b) processing result by median filtering.角膜整体轮廓提取过程 (a) OTSU算法处理结果; (b) 中值滤波处理结果
Fig. 5. Modeling and extraction results of corneal contour in low SNR region: (a) Modeling results of surface contour points in low SNR region; (b) contour extraction result of low SNR region.低信噪比区域角膜轮廓建模及提取结果 (a)低信噪比区域表面轮廓点建模结果; (b)低信噪比区域轮廓提取结果
Fig. 6. Extraction process of the complete cornea contour: (a) Extraction results of the contour points in the upper and lower cornea surfaces; (b) fitting result of the cornea contour角膜完整轮廓的提取过程 (a)角膜上下表面轮廓点提取结果; (b) 角膜轮廓拟合结果
Fig. 7. Comparison of the effects of the two algorithms: (a) Results of the contour extraction of the two algorithms; (b) results of the corneal thickness calculated by the two algorithms.两种算法效果对比 (a)两种算法轮廓提取结果; (b) 两种算法角膜厚度平均计算结果
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Table 1. Comparison of the accuracy of two algorithmsfor contour extraction of high and low SNR regions.
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