数字图像处理获取某位的Bit

Question

不理解,求解释:

def getBit(num, bit_idx=8):
     return (num & (1 << (8 - bit_idx))) >> (8 - bit_idx)

Answer 1

感觉下错了吧，应该你要获取对应数字二进制编码的你bit_idx位上的编码，感觉应该这么写：

def getBit(num, bit_idx=8):
    if bit_idx<1:
        print('Error')
    return (num & (1 <<(bit_idx-1))) >> (bit_idx-1)