image_utils.py 文件源码

def variance_of_laplacian(im): 
    """
    Compute the Laplacian of the image and then return the focus
    measure, which is simply the variance of the Laplacian
    http://www.pyimagesearch.com/2015/09/07/blur-detection-with-opencv/
    """
    return cv2.Laplacian(im, cv2.CV_64F).var()