Unable to read exposure time from OAK-PRO W POE

JanKanka

Hello. I need to get the camera frame exposure time for the purpose of my experiment and with using:

camControl = dai.CameraControl()

ET = camControl.getExposureTime().total_seconds() * 1000.

The ET is always 0.0 no matter how dim the illumination of the sample is.

I'm most probably doing something wrong, but I cannot figure out what it is.

How to read it correctly?

thanks, Jan

erik

Hi JanKanka ,

Here's a code snippet that achieves that:

import cv2
import depthai as dai

pipeline = dai.Pipeline()
camRgb = pipeline.create(dai.node.ColorCamera)

xoutRgb = pipeline.create(dai.node.XLinkOut)
xoutRgb.setStreamName("rgb")
camRgb.preview.link(xoutRgb.input)

# Connect to device and start pipeline
with dai.Device(pipeline) as device:
    qRgb = device.getOutputQueue(name="rgb", maxSize=4, blocking=False)
    while True:
        inRgb = qRgb.get()  # blocking call, will wait until a new data has arrived
        print(inRgb.getExposureTime())
        cv2.imshow("rgb", inRgb.getCvFrame())
        if cv2.waitKey(1) == ord('q'):
            break

JanKanka

Thank you for the code snippet.

Now it is showing 30ms even if the camera is facing dark object and Auto Exposure overbrighten the scene. So there is also some other kind of compensation.

Anyhow, thank you again!