camera loop.py

from picamera import PiCamera
from time import sleep
import time


def camera_loop(air_speed, img_size, altitude, focal_length, img_overlap, sensor_size):
    # img_size in px
    # altitude in m
    # focal length in mm 
    # air speed in m/s
    # img_overlap between 0 and 1 
    while True:
        # take picture 
        img_size_meters = get_img_size_meters(img_size, altitude, focal_length, sensor_size)
        delta_meters = img_size_meters * (1 - img_overlap)
        delta_seconds = delta_meters / air_speed
        time.sleep(delta_seconds)


def get_img_size_meters(img_size, altitude, focal_length, sensor_size):
    C = 2.41 # Constant determined through experiments, should be tested with pi cam
    focal_length_px = focal_length * img_size / sensor_size
    return C * (img_size / focal_length_px) * altitude 

camera = PiCamera()
camera.start_preview()
sleep(5)
camera.capture('/tmp/picture.jpg')
camera.stop_preview()