Fiber images taken by optical microscope tend to have poor focus, uneven brightness or blurred edge. Using mathematical morphology method, such as open or close operation to preprocess the fiber image, which is likely to lead to distortion of the edge of the fiber image and affect the subsequent separation operation. B-spline curve is used to fit the background of the image, then the fitting background is subtracted from the original image. Next, the complex domain nonlinear anisotropic

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... n process is used to denoise and enhance the image edge. Finally, Binarized the image and filling area to get a clear picture of the target fiber image.