Display face recognition

Before going through this tutorial, you should have the following set up:

Start the Redis server:
Make sure the dependencies for the face recognition service are installed in your virtual environment:
```
pip install social-interaction-cloud[face-recognition]
```
Use the following command to start the face recognition service, and pass the model files (the cascade classifier file used in this example can be found here: haarcascade_frontalface_default.xml ):
```
run-face-recognition --model resnet50_ft_weight.pt --cascadefile haarcascade_frontalface_default.xml
```

Create a new file with the code below or use demo_desktop_camera_facerecognition.py from GitHub.

Imports and callbacks

import queue

import cv2

from sic_framework.core.message_python2 import BoundingBoxesMessage
from sic_framework.core.message_python2 import CompressedImageMessage
from sic_framework.core.utils_cv2 import draw_on_image
from sic_framework.devices.desktop.desktop_camera import DesktopCamera
from sic_framework.services.face_recognition_dnn.face_recognition_service import DNNFaceRecognition

imgs_buffer = queue.Queue()
def on_image(image_message: CompressedImageMessage):
    try:
        imgs_buffer.get_nowait()  # remove previous message if its still there
    except queue.Empty:
        pass
    imgs_buffer.put(image_message.image)


faces_buffer = queue.Queue()
def on_faces(message: BoundingBoxesMessage):
    try:
        faces_buffer.get_nowait()  # remove previous message if its still there
    except queue.Empty:
        pass
    faces_buffer.put(message.bboxes)

# code continues below

# Connect to the services
camera = DesktopCamera()
face_rec = DNNFaceRecognition()

# Feed the camera images into the face recognition component
face_rec.connect(camera)

# Send back the outputs to this program
camera.register_callback(on_image)
face_rec.register_callback(on_faces)

while True:
    img = imgs_buffer.get()
    faces = faces_buffer.get()

    for face in faces:
        draw_on_image(face, img)

    cv2.imshow('', img)
    cv2.waitKey(1)

Here is the schematic overview of how this program works. The camera streams its output to the face recognition service, and both stream the output to the program on your laptop.