错误：（-215：断言失败）函数“cv：：imwrite”中的 _img.empty（）

问：

我正在尝试使用主密钥加密的概念，使用 AES-GCM 算法实现图像加密项目。通过访问网络摄像头并单击快照并在保存之前对其进行加密，加密代码可以正常工作。但是在解密图像时，代码显示错误，指出“错误：（-215：断言失败）！_img.empty（）在函数'cv：：imwrite'中”。如何解决此问题？

cipher = Cipher(algorithms.AES(derived_key), modes.GCM(iv, tag), backend=default_backend())
    decryptor = cipher.decryptor()

    # Decrypt the image
    decrypted_data = decryptor.update(ciphertext) + decryptor.finalize()

    # Convert the decrypted data to an image (assuming it was an image that was encrypted)
    decrypted_image = cv2.imdecode(np.frombuffer(decrypted_data, np.uint8), cv2.IMREAD_COLOR)

    # Define the path to the "Decrypted snaps" folder
    decrypted_folder = "Decrypted snaps"

    # Create the "Decrypted snaps" folder if it doesn't exist
    if not os.path.exists(decrypted_folder):
        os.makedirs(decrypted_folder)

    # Extract the filename from the input path
    filename = os.path.basename(encrypted_image_filename)

    # Create the path to save the decrypted image in the "Decrypted snaps" folder
    decrypted_image_path = os.path.join(decrypted_folder, filename)
    print(decrypted_image_path)

    # Save the decrypted image
    cv2.imwrite(decrypted_image_path, decrypted_image)
    print(f"Decrypted image saved as '{decrypted_image_path}'")

我之前使用 Fernet，我遇到了同样的问题，所以我切换到 GCM，但问题仍然存在。