from base64 import b64decode
import numpy as np
import cv2


def base64_to_np(img_data):
    color_image_flag = 1
    img_data = img_data.split(',', 1)[-1]
    # b64decode -> base64图片解码
    # np.fromstring -> 从字符串中的文本数据初始化的新一维数组
    # numpy.fromstring(string, dtype=float, count=-1, sep='')
    return cv2.imdecode(np.fromstring(b64decode(img_data), dtype=np.uint8), color_image_flag)