我想在linebot中接收上傳至雲端空間後之回傳圖檔。

但可能寫的方式有誤，它出現了這樣的訊息:
UnboundLocalError: local variable 'text_detected' referenced before assignment

我猜測是否為參數兩邊不一致所產生的問題?......
新寫method 的參數，我設置為user_id，而在handle_content 中上傳file後，呼叫中的method裡參數，我設置為(user.user_id)。
但這兩邊，我沒辦法弄成一致(還是新手，有一些觀念不是太清楚，有誤地方，請多包涵)

附上截取程式碼如下:

def text_detected(user_id):
    input_file=f"gs://img_platecapture/{user_id}.jpg"
    with io.open(input_file, 'rb') as image_file:
        content = image_file.read()
    
    image = vision.Image(content=content)
    response = client.text_detection(image=image)
    
    if response.error.message:
        raise Exception(
            '{}\nFor more info on error messages, check: '
      'https://cloud.google.com/apis/design/errors'.format(
            response.error.message))

    img = Image.open(input_file)
    draw = ImageDraw.Draw(img)
    font = ImageFont.truetype("simsun.ttc", 18)
 
    for text in response.text_annotations[1::]:
        ocr = text.description
        bound=text.bounding_poly
        draw.text((bound.vertices[0].x-25, bound.vertices[0].y-25),ocr,fill=(255,0,0),font=font)
    
        draw.polygon(
            [
                bound.vertices[0].x,
                bound.vertices[0].y,
                bound.vertices[1].x,
                bound.vertices[1].y,
                bound.vertices[2].x,
                bound.vertices[2].y,
                bound.vertices[3].x,
                bound.vertices[3].y,
            ],
            None,
            'yellow',
            )

    texts=response.text_annotations
    a=str(texts[0].description.split())

    b=re.sub(u"([^\u4e00-\u9fa5\u0030-u0039])","",a)  
    b1="".join(b)
    print("偵測到的地址為:",b1)
    return b1

@handler.add(MessageEvent, message=ImageMessage)
def handle__message(event):
    message_content = line_bot_api.get_message_content(event.message.id)
    user = line_bot_api.get_profile(event.source.user_id)

    data=b''
    for chunk in message_content.iter_content():
        data+= chunk

    bucket_name = 'img_platecapture'
    bucket = storage_client.bucket(bucket_name)
    blob = bucket.blob(f'{user.user_id}.jpg')
    blob.upload_from_string(data)
    text_detected=text_detected(user.user_id) ##這裡出現問題

    line_bot_api.reply_message(
        event.reply_token,
        messages=TextSendMessage(
        text=text_detected
    ))