如何使用 django 帧实时流式传输 opencv 帧? [英] How to stream opencv frame with django frame in realtime?

问题描述

我正在尝试使用 raspberry pi 从 USB 摄像头捕获图像并使用 Django 框架进行流式传输我尝试使用 StreamingHttpResponse 从 Opencv2 流式传输帧.但是，它只显示 1 帧而不替换图像.

如何实时替换图片?

这是我的代码.

from django.shortcuts 导入渲染从 django.http 导入 HttpResponse,StreamingHttpResponse导入 cv2导入时间类 VideoCamera(对象):def __init__(self):self.video = cv2.VideoCapture(0)def __del__(self):self.video.release()def get_frame(self):ret,image = self.video.read()ret,jpeg = cv2.imencode('.jpg',image)返回 jpeg.tobytes()def gen(相机):而真:frame = camera.get_frame()产量(帧)时间.sleep(1)定义索引(请求):# response = HttpResponse(gen(VideoCamera())返回 StreamingHttpResponse(gen(VideoCamera()),content_type="image/jpeg")

解决方案

@Ritwick 我所做的是将 gen 和 index 函数更改为下面

def gen(camera):而真:frame = camera.get_frame()yield(b'--frame
'b'内容类型:图像/jpeg

' + frame + b'

')@gzip.gzip_page定义索引(请求):尝试:返回 StreamingHttpResponse(gen(VideoCamera()),content_type="multipart/x-mixed-replace;boundary=frame")除了 HttpResponseServerError 作为 e:打印(中止")

我使用 python 生成器生成每个相机帧，并使用 StreamingHttpResponse 替换边界标记为 frame

multipart/x-mixed-replace>

在 django 中有一个 gzip 装饰器功能.

from django.views.decorators import gzip</pre>

提高流式传输速度.我使用了 django gzip 装饰器方法来 gzip 框架.

I'm trying to use raspberry pi capture the image from USB camera and stream it with Django framework I have tried to use StreamingHttpResponse to stream the frame from Opencv2. However, it just shows 1 frame and not replacing the image.

How can I replace the image in real time?

Here is my code.

from django.shortcuts import render
from django.http import HttpResponse,StreamingHttpResponse
import cv2
import time

class VideoCamera(object):
    def __init__(self):
        self.video = cv2.VideoCapture(0)
    def __del__(self):
        self.video.release()

    def get_frame(self):
        ret,image = self.video.read()
        ret,jpeg = cv2.imencode('.jpg',image)
        return jpeg.tobytes()

def gen(camera):
    while True:
        frame = camera.get_frame()
        yield(frame)
        time.sleep(1)

def index(request):
    # response = HttpResponse(gen(VideoCamera())
    return StreamingHttpResponse(gen(VideoCamera()),content_type="image/jpeg")

解决方案

@Ritwick What I have done is by changing the gen and index function to below

def gen(camera):
    while True:
        frame = camera.get_frame()
        yield(b'--frame
'
        b'Content-Type: image/jpeg

' + frame + b'

')

@gzip.gzip_page
def index(request): 
    try:
        return StreamingHttpResponse(gen(VideoCamera()),content_type="multipart/x-mixed-replace;boundary=frame")
    except HttpResponseServerError as e:
        print("aborted")

I use the python generator to generate every camera frame and using the StreamingHttpResponse to replace the multipart/x-mixed-replace which the boundary tagged as frame

In django there is a gzip decorator function.

from django.views.decorators import gzip</pre>

To improve the speed of Streaming. I used the django gzip decorator method to gzip the frame.

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