url转numpy array，url转PIL Image，url转图片

url转numpy array

import cv2
import urllib.request
import numpy as np

def url_to_array(url):
    with urllib.request.urlopen(url) as resp:
        image = np.asarray(bytearray(resp.read()), dtype="uint8")
    image = cv2.imdecode(image, cv2.IMREAD_COLOR)
    return image

url转PIL Image

from PIL import Image
import io
import requests

def url_to_pil(url):
    resp = requests.get(url)
    if resp.status_code==200:
        image_bytes = resp.content
    img = Image.open(io.BytesIO(image_bytes)).convert('RGB')
    return img

url转图片

from PIL import Image
import io
import requests

def url_to_image(url):
    response = requests.get(url)
    if response.status_code==200:
        with open("./demo.jpg","wb") as f:
            f.write(response.content)
    return img

numpy转byte

from PIL import Image
import io

def arr_to_byte(im_arr):
	imagepil = Image.fromarray(im_arr)
	img_byte_arr = io.BytesIO()
	imagepil.save(img_byte_arr, format='JPEG')
	image_bytes = img_byte_arr.getvalue()
    return image_bytes