2020-12-11 图片格式互转：base64、PIL Image opencv cv2互转

骑猪看日落 2022-12-27 12:57 94阅读 0赞

## 图片格式互转：base64、PIL Image opencv cv2互转 ##

### base64 to PIL Image ###

import base64
    from io import BytesIO
    from PIL import Image
    
    with 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 cv2
    
    with 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 Image
    
    img = 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 cv2
    
    img = 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)

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