#VSCode – Let’s do some #FaceRecognition with 20 lines in #Python (6/N)

Hi!

In my last post I share some lines of code which allowed me to run some of the face recognition demos 6 times faster. I added a Frames per Second (FPS) feature in my samples. Later, thinking about performance, I realize that I don’t need to work with a full HD picture (1920 x 1080), so I added some code to resize the photo before the face detection process.

However, while I was coding around this solution I also realized that I may want to initialize my camera to start in a lower resolution. So, I searched online on how to do this with OpenCV and I found 3 beautiful lines of code.

	# standard face detection sample with FPS in console
	# open camera in low resolution to get better FPS
	import face_recognition
	import cv2
	import time
	video_capture = cv2.VideoCapture(0)
	video_capture.set(cv2.CAP_PROP_FRAME_WIDTH,640)
	video_capture.set(cv2.CAP_PROP_FRAME_HEIGHT,480)
	while True:
	start_time = time.time()
	ret, frame = video_capture.read()
	rgb_frame = frame[:, :, ::-1]
	face_locations = face_recognition.face_locations(rgb_frame)
	for top, right, bottom, left in face_locations:
	cv2.rectangle(frame, (left, top), (right, bottom), (0, 0, 255), 2)
	cv2.imshow('Video', frame)
	print("FPS: ", 1.0 / (time.time() – start_time)) # FPS = 1 / time to process loop
	if cv2.waitKey(1) & 0xFF == ord('q'):
	break
	video_capture.release()
	cv2.destroyAllWindows()

view raw FaceDetectionOpenCvOpenCameraLowResolution.py hosted with ❤ by GitHub

So, I manage to improve my processing code from 20FPS to +30FPS … which is very good ! Later on this posts I’ll try to do some similar FPS tests on a smaller device and I’ll see and share how this works.

Happy Coding!

Greetings @ Burlington

El Bruno

Resources

• Anaconda Distribution, https://www.anaconda.com/distribution/
• Visual Studio Code, https://code.visualstudio.com/
• Adam Geitgey, https://github.com/ageitgey/face_recognition
• StackOverflow, fps – how to divide count by time function to determine fps
• OpenCV, How to set camera resolution (webcam) with opencv?