圖片格式互轉：base64、PIL Image opencv cv2互轉

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base64 to PIL Image

import base64 from io import BytesIO from PIL import Imagewith open("test.jpg", "rb") as f:im_b64 = base64.b64encode(f.read())im_bytes = base64.b64decode(im_b64) # im_bytes is a binary image im_file = BytesIO(im_bytes) # convert image to file-like object img = Image.open(im_file) # img is now PIL Image object

base64 to OpenCV Image

import base64 import numpy as np import cv2with open("test.jpg", "rb") as f:im_b64 = base64.b64encode(f.read())im_bytes = base64.b64decode(im_b64) im_arr = np.frombuffer(im_bytes, dtype=np.uint8) # im_arr is one-dim Numpy array img = cv2.imdecode(im_arr, flags=cv2.IMREAD_COLOR)

PIL Image to base64

import base64 from io import BytesIO from PIL import Imageimg = Image.open('test.jpg') im_file = BytestIO() img.save(im_file, format="JPEG") im_bytes = im_file.getvalue() # im_bytes: image in binary format. im_b64 = base64.b64encode(im_bytes)

OpenCV to base64 image

import base64 import numpy as np import cv2img = cv2.imread('test.jpg') _, im_arr = cv2.imencode('.jpg', img) # im_arr: image in Numpy one-dim array format. im_bytes = im_arr.tobytes() im_b64 = base64.b64encode(im_bytes)

總結

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