freeRAM func
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int freeRAM() {
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extern int __heap_start, *__brkval;
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int v;
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return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
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}
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Code from this tutorial
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https://pyimagesearch.com/2019/09/02/opencv-stream-video-to-web-browser-html-page/.
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import numpy as np
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import imutils
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import cv2
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class SingleMotionDetector:
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def __init__(self, accumWeight=0.5):
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# store the accumulated weight factor
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self.accumWeight = accumWeight
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# initialize the background model
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self.bg = None
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def update(self, image):
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# if the background model is None, initialize it
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if self.bg is None:
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self.bg = image.copy().astype('float')
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return
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# update the background model by accumulating the weighted
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# average
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cv2.accumulateWeighted(image, self.bg, self.accumWeight)
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def detect(self, image, tVal=25):
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# compute the absolute difference between the background model
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# and the image passed in, then threshold the delta image
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delta = cv2.absdiff(self.bg.astype('uint8'), image)
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thresh = cv2.threshold(delta, tVal, 255, cv2.THRESH_BINARY)[1]
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# perform a series of erosions and dilations to remove small blobs
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thresh = cv2.erode(thresh, None, iterations=2)
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thresh = cv2.dilate(thresh, None, iterations=2)
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# find contours in the thresholded image and initialize
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# the minimum and maximum bounding box regions for motion
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cnts = cv2.findContours(thresh.copy(), cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE)
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cnts = imutils.grab_contours(cnts)
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(minX, minY) = (np.inf, np.inf)
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(maxX, maxY) = (-np.inf, -np.inf)
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# if no contours were found, return None
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if len(cnts) == 0:
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return None
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# otherwise, loop over the contours
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for c in cnts:
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# compute the bounding box of the contour and use it to
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# update the minimum and maximum bounding box regions
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(x, y, w, h) = cv2.boundingRect(c)
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(minX, minY) = (min(minX, x), min(minY, y))
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(maxX, maxY) = (max(maxX, x + w), max(maxY, y + h))
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# otherwise, return a tuple of the thresholded image along
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# with bounding box
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return (thresh, (minX, minY, maxX, maxY))
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[tool.black]
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skip-string-normalization = true
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pycodestyle = true
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line-length = 100
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#!/bin/sh
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python3 ./webstreaming.py --ip 0.0.0.0 --port 8000
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>OpenCV – Stream video</title>
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<style type="text/css">
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body {
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background-color: #2a2a3a;
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color: #efefef;
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font-family: Ubuntu;
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}
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div.video {
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text-align: center;
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}
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img.video-frame {
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border-radius: 8px;
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}
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</style>
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</head>
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<body>
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<div class="video">
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<h1>OpenCV – Stream video to web browser/HTML page</h1>
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<img class="video-frame" src="{{ url_for('video_feed') }}">
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</div>
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</body>
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</html>
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#!/usr/bin/env python3
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# import the necessary packages
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from motion_detection import SingleMotionDetector
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from imutils.video import VideoStream
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from flask import Response
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from flask import Flask
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from flask import render_template
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import threading
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import argparse
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import datetime
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import imutils
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import time
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import cv2
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# initialize the output frame and a lock used to ensure thread-safe
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# exchanges of the output frames (useful when multiple browsers/tabs
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# are viewing the stream)
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outputFrame = None
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lock = threading.Lock()
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# initialize a flask object
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app = Flask(__name__)
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# initialize the video stream and allow the camera sensor to
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# warmup
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# vs = VideoStream(usePiCamera=1).start()
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vs = VideoStream(src=0).start()
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time.sleep(2.0)
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def detect_motion(frameCount):
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# grab global references to the video stream, output frame, and lock variables
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global vs, outputFrame, lock
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# initialize the motion detector and the total number of frames read thus far
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md = SingleMotionDetector(accumWeight=0.1)
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total = 0
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# loop over frames from the video stream
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while True:
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# read the next frame from the video stream, resize it,
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# convert the frame to grayscale, and blur it
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frame = vs.read()
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frame = imutils.resize(frame, width=400)
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gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
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gray = cv2.GaussianBlur(gray, (7, 7), 0)
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# grab the current timestamp and draw it on the frame
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timestamp = datetime.datetime.now()
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cv2.putText(
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frame,
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timestamp.strftime("%A %d %B %Y %I:%M:%S%p"),
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(10, frame.shape[0] - 10),
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cv2.FONT_HERSHEY_SIMPLEX,
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0.35,
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(0, 0, 255),
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1,
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)
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# if the total number of frames has reached a sufficient
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# number to construct a reasonable background model, then
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# continue to process the frame
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if total > frameCount:
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# detect motion in the image
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motion = md.detect(gray)
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# check to see if motion was found in the frame
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if motion is not None:
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# unpack the tuple and draw the box surrounding the "motion area" on the output frame
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(thresh, (minX, minY, maxX, maxY)) = motion
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cv2.rectangle(frame, (minX, minY), (maxX, maxY), (0, 0, 255), 2)
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# update the background model and increment the total number of frames read thus far
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md.update(gray)
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total += 1
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# acquire the lock, set the output frame, and release the lock
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with lock:
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outputFrame = frame.copy()
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def generate():
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# grab global references to the output frame and lock variables
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global outputFrame, lock
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# loop over frames from the output stream
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while True:
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# wait until the lock is acquired
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with lock:
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# check if the output frame is available, otherwise skip the iteration of the loop
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if outputFrame is None:
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continue
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# encode the frame in JPEG format
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(flag, encodedImage) = cv2.imencode('.jpg', outputFrame)
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# ensure the frame was successfully encoded
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if not flag:
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continue
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# yield the output frame in the byte format
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yield (
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b'--frame\r\n' b'Content-Type: image/jpeg\r\n\r\n' + bytearray(encodedImage) + b'\r\n'
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)
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@app.route('/')
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def index():
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# return the rendered template
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return render_template('index.html')
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@app.route('/video_feed')
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def video_feed():
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# return the response generated along with the specific media
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# type (mime type)
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return Response(generate(), mimetype='multipart/x-mixed-replace; boundary=frame')
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# check to see if this is the main thread of execution
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if __name__ == '__main__':
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# construct the argument parser and parse command line arguments
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ap = argparse.ArgumentParser()
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ap.add_argument('-i', '--ip', type=str, required=True, help='ip address of the device')
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ap.add_argument(
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'-o',
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'--port',
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type=int,
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required=True,
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help='ephemeral port number of the server (1024 to 65535)',
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)
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ap.add_argument(
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'-f',
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'--frame-count',
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type=int,
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default=32,
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help='# of frames used to construct the background model',
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)
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args = vars(ap.parse_args())
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# start a thread that will perform motion detection
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t = threading.Thread(target=detect_motion, args=(args['frame_count'],))
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t.daemon = True
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t.start()
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# start the flask app
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app.run(host=args['ip'], port=args['port'], debug=True, threaded=True, use_reloader=False)
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# release the video stream pointer
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vs.stop()
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