Implement image transfer

[mkristofic]

Implement a class that enables sending images from the client (Raspberry PI) to the server (GCP VM Instance).
Class name: "Streamer".
Store the class source code inside the "modules" folder.

[mkristofic]

The Streamer class was created. The class was tested with the server and client scripts:

# server.py

import socket
import numpy as np
import cv2

host = "localhost"
port = 5000
server_address = (host, port)

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(server_address)
print('starting up on %s:%s' % server_address)

while True:
    data, address = sock.recvfrom(65535)
    nparr = np.frombuffer(data, np.uint8)
    img = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
    cv2.imshow('Server feed',img)
    # print(data)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

# client.py

import socket
from modules.Streamer import Streamer

streamer = Streamer("localhost", 5000, 0)
streamer.send_to_server()

The class uses TCP to send the image data to the server. While testing, a problem was discovered. Size of a image that is sent over the TCP tends to exceed the maximal size of 65535 bytes. The problem can be avioded by slightly changing the Recorder class to output JPEGs with lower quality. For example, in the get_frame() method:

success, image = self.video.read()
encode_param = [int(cv2.IMWRITE_JPEG_QUALITY), 75]
ret, jpeg = cv2.imencode('.jpg', image, encode_param)