Hi All,
I'm working on a project where a camera is installed and a pic is taken after the door is closed. So i need to identify the number of people seated in the car using the image captured. Is there any already trained models i could use to achieve this? Should i go for face detection to count the number of people or human detection? what should be the right approach?
Here is code for ARM:
#1/usr/bin/python3.7.3
#OpenCV 4.2, Raspberry pi 3/3b+, 4b, Buster ver 10
#Date 30th January, 2020
import cv2 as cv
face_cascade = cv.CascadeClassifier('haarcascade_frontalface_default.xml')
cap = cv.VideoCapture(1)
font = cv.FONT_HERSHEY_SIMPLEX
org = (5, 25)
color = (255, 0, 0)
while cap.isOpened():
# reads frames
ret, img = cap.read()
# convert to gray scale
gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
# Detects faces
faces = face_cascade.detectMultiScale(gray, 1.1, 5)
#print("Number of {0} faces!".format(len(faces)))
cv.putText(img, "Number of {0} faces!".format(len(faces)),
org, font, 1, color, 2)
cv.imshow('img',img)
# Wait for Esc key to stop
k = cv.waitKey(10)
if k == 27:
break
cap.release()
cv.destroyAllWindows()
if you needed picamera. I'll be happier to help.
The open source world is moving massively to deep learning approaches without considering the "old school" methods are (still in 2020) the best trade-off in speed/accuracy for a lot of application (specially on ARM devices). I can suggest to use an earlier versions of OpenCV to train the cascades, I'm still using the traincascade in Opencv 2.4.10 and it is still perfectly working and suitable for OpenCV 3 and 4. More here:
Detecting people in cars it's tricky mostly due to lighting condition. Standard cascades in opencv won't work, you should try training custom cascades by yourself.
Regards!
Asked: 2020-01-20 01:04:57 -0600
Seen: 1,286 times
Last updated: Mar 29 '20
You most likely want to use a cnn for this. Search for a pretrained model for detecting person and cars. Then use the dnn module of opencv to evaluate the model. There a lot of tutorials out there.
@Huma. Where will you camera in vehicle(depending on vehicle)?
Hah! - good question - on this your model selection depends.
I was going to ask him where will he puts camera. As you noticed driver seat and front passenger seat both have on headrests too. It is too dark inside vehicle or not.