12.1.10.1.1. Timer

This script creates an instance of a DummyGrabber and implements a timer with an interval of 1000ms.

Everytime, the interval is expired the method imageAcquisition is called. It acquires a new image an appends it to the global list myImages.

To stop the timer, call the method cancel. Additionally, the timer is automatically interrupted after 10 iterations.

from itom import timer
from itom import dataIO
from itom import dataObject

Function for the image acquisition.

def imageAcquisition():
    global iters
    global t
    global cam
    global myImages

    print("acquire next image")
    cam.acquire()
    d = dataObject()
    cam.getVal(d)
    globals()["myImages"].append(d.copy())
    iters += 1
    if iters >= 10:
        t.stop()

Call this method (e.g. by your gui) to stop the timer.

def cancel():
    global t
    global cam
    t.stop()
    cam.stopDevice()

Define a DummyGrabber camera and timer for a timed acquisition.

cam = dataIO("DummyGrabber")
myImages = []
iters = 0
cam.startDevice()
t = timer(1000, imageAcquisition)