preprocess.py 文件源码

def foreground(img,blockSize=31):
    """calculate foreground in an image
    return: foreground
    """
    img=100*(img-np.mean(img))
    img[np.where(img>255)]=255
    img=cv2.boxFilter(img,-1,(blockSize,blockSize))
    img[np.where(img>150)]=255; img[np.where(img<=150)]=0   
    img=cv2.boxFilter(img,-1,(blockSize/2,blockSize/2))
    img[np.where(img>0)]=255
    return img