We present a robust and fiducial-marker-free algorithm that can identify and correct stick-slip distortion caused by nonuniform rotation (or beam scanning) in distally scanned catheters for endoscopic optical coherence tomography (OCT) images. This algorithm employs spatial frequency analysis to select and remove distortions. We demonstrate the feasibility of this algorithm on images acquired from ex vivo rat colon with a distally scanned DC motor-based endoscope. The proposed algorithm can be applied to general endoscopic OCT images for correcting nonuniform rotation distortion.

中文翻译：

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远端扫描光学相干断层扫描导管中的粘滑非均匀旋转畸变校正

我们提出了一种稳健且无基准标记的算法，该算法可以识别和纠正内窥镜光学相干断层扫描 (OCT) 图像的远端扫描导管中由不均匀旋转（或光束扫描）引起的粘滑失真。该算法采用空间频率分析来选择和消除失真。我们证明了该算法在使用远端扫描的基于直流电机的内窥镜从体外大鼠结肠获取的图像上的可行性。所提出的算法可以应用于一般内窥镜OCT图像，用于校正非均匀旋转失真。