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我需要帮助在 IP 摄像机拍摄的图像上加上时间戳，我制作了一个将图像保存为本地文件的代码版本，然后 opencv 在上面写入，现在我想在上面写入而不保存之前，但我被困住了。这是代码：

import requests
import time
import shutil
import os
from requests.auth import HTTPBasicAuth
import cv2
from datetime import datetime
from datetime import date
import numpy as np


url = 'http://192.168.0.138/image.jpg?cidx=366981845'


user = '****'
psw = '****'

path = 'ipCameraScreen.png'



font = cv2.FONT_HERSHEY_SIMPLEX
position = (20, 30)
color = (255, 255, 255)
font_size = 0.5
font_stroke = 1


while True:

    response = requests.get(url, auth=HTTPBasicAuth(user, psw), stream = True)
    resp_raw = response.raw

    if response.status_code == 200:

        # DEFINE TIMESTAMP
        current_date = str(date.today())
        current_time = datetime.now().strftime("%H:%M:%S")
        timestamp = (current_date + " | " + current_time)

        with open(path, 'wb') as out_file:
            shutil.copyfileobj(response.raw, out_file)
            img = np.asarray(bytearray(resp_raw.read()), dtype="uint8")
            img = cv2.imdecode(img, cv2.IMREAD_COLOR)
            cv2.putText(img, timestamp, position, font, font_size, color, font_stroke)
            cv2.imwrite(path, img)
        print("Screen saved, path:", path)
        time.sleep(3)
    else:
        print("Connection failed")


    time.sleep(3)

    if os.path.exists(path):
            os.remove(path)
            print("image removed")
            time.sleep(2)

输出是：

cv2.error: OpenCV(4.5.2) C:\Users\runneradmin\AppData\Local\Temp\pip-req-build-m8us58q4\opencv\modules\imgcodecs\src\loadsave.cpp:736: error: (-215:Assertion failed) !buf.empty() in function 'cv::imdecode_'

请帮助我，对不起简单的英语

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2 回答 2

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您的错误表明，当您尝试使用 imdecode() 将数组解码为 img 时，缓冲区为空。

这意味着在上一行中：

img = np.asarray(bytearray(resp_raw.read()), dtype="uint8")

resp_raw.read() 给你一个空数组。

我会分析您使用 Postman 之类的工具执行的 GET 请求，或者只是尝试打印 resp_raw 的内容，因为它似乎没有返回图像。

于 2021-05-24T09:49:47.697 回答
-1

我解决了，我只是重新做了定义 resp_raw 的请求，我这样做了：

response = requests.get(url, auth=HTTPBasicAuth(user, psw), stream = True)
resp_raw = requests.get(url, auth=HTTPBasicAuth(user, psw), stream = True).raw

而不是这个：

response = requests.get(url, auth=HTTPBasicAuth(user, psw), stream = True)
resp_raw = response.raw
于 2021-05-24T13:27:07.780 回答