preprocessor_eval.py 文件源码

def thresholding(img_grey):
    """
    This functions creates binary images using thresholding
    :param img_grey: greyscale image
    :return: binary image
    """
    # # Adaptive Gaussian
    # img_binary = cv.adaptiveThreshold(img_grey, 255, cv.ADAPTIVE_THRESH_GAUSSIAN_C, cv.THRESH_BINARY, 11, 2)

    # Otsu's thresholding after Gaussian filtering
    blur = cv.GaussianBlur(img_grey, (5, 5), 0)
    ret3, img_binary = cv.threshold(blur, 0, 255, cv.THRESH_BINARY + cv.THRESH_OTSU)

    # invert black = 255
    ret, thresh1 = cv.threshold(img_binary, 127, 255, cv.THRESH_BINARY_INV)

    return thresh1