【python】圖像相關小記

打開圖片:

PIL:

PIL_img=Image.open(path)

openCV:

cv.imread(

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圖片尺寸:

PIL:

PIL_img.size[1]
PIL_img.size[0]

openCV:

img.shape[0]
img.shape[1]

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圖片轉bytes:

PIL:

imgByteArr = BytesIO()
PIL_img.save(imgByteArr, format='PNG')

openCV:

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圖片bytes轉str unicode編碼:

PIL:

img_byte = base64.b64encode(imgByteArr.getvalue())
img_str = img_byte.decode('ascii')

openCV:

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str unicode編碼 轉 圖片bytes:

PIL:

img_decode_ = img_str.encode('ascii') #從unicode變成ascii編碼
img_decode = base64.b64decode(img_decode_)

openCV:

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圖片bytes 轉 圖片:

PIL:

openCV:

img_np_ = np.frombuffer(img_decode, np.uint8)
img = cv2.imdecode(img_np_, cv2.COLOR_RGB2BGR) #轉爲opencv格式

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