DepthAI app fullscreen mode and Raspberry Pi Zero error.

Hi Ram,

This is an extremely well timed question. So the reason for the trouble on Pi Zero is because the Armv6 wheels would not build correctly in Pi Wheels. But actually today this was fixed:
https://github.com/piwheels/piwheels/pull/276

So now prebuilt wheels will work from now on on pi zero. This is quite convenient for Pi Zero folks using DepthAI. :-)

The thing I don't know is how long it will take for DepthAI (and OpenCV) to build for Pi Zero. As I think there's automation that we don't have control of involved. I think @GergelySzabolcs may know though.

Thanks,
Brandon

Yes, that's right WRT the release. We have a pre-built binary somewhere that we built actually on a Pi Zero too, if you didn't want to wait. I can't immediately find it but it's on this forum... somewhere.

So on the second question, I dodged it because I don't know. Eeeh. :-). @dhruvsheth-ai probably knows though. :-)

Hi ramkunchur ! I'll try the snippet you've sent to run in full screen mode. Get back to you in an hour or two

Hi ramkunchur it seems you're correct. I couldn't find a way to initialise the depthai python script in the preferred environment when the raspberry Pi boots up. However I'm working on this and I hope to get back with a solution by tomorrow.

Hi @ramkunchur so, a simple way to do fullscreen mode while also maintaining desired resolution is using this -

#!/usr/bin/env python3

import cv2
import depthai as dai

# Start defining a pipeline
pipeline = dai.Pipeline()

# Define a source - color camera
camRgb = pipeline.createColorCamera()
camRgb.setPreviewSize(192, 108)
camRgb.setBoardSocket(dai.CameraBoardSocket.RGB)
camRgb.setResolution(dai.ColorCameraProperties.SensorResolution.THE_1080_P)
camRgb.setInterleaved(False)
camRgb.setColorOrder(dai.ColorCameraProperties.ColorOrder.RGB)

# Create output
xoutRgb = pipeline.createXLinkOut()
xoutRgb.setStreamName("rgb")
camRgb.preview.link(xoutRgb.input)

# Pipeline is defined, now we can connect to the device
with dai.Device(pipeline) as device:
    # Start pipeline
    device.startPipeline()

    # Output queue will be used to get the rgb frames from the output defined above
    qRgb = device.getOutputQueue(name="rgb", maxSize=4, blocking=False)

    while True:
        inRgb = qRgb.get()  # blocking call, will wait until a new data has arrived

        # Retrieve 'bgr' (opencv format) frame
        cv2.namedWindow("bgr", cv2.WND_PROP_FULLSCREEN)
        cv2.setWindowProperty("bgr",cv2.WND_PROP_FULLSCREEN,
               cv2.WINDOW_FULLSCREEN)
        cv2.imshow("bgr", cv2.resize(inRgb.getCvFrame(), (1920, 1080)))

        if cv2.waitKey(1) == ord('q'):
            break

So here you can set the desired resolution input for the image frame using setPreviewsize, but ofcourse when you go fullscreen, you need to take into account that the output resolution might look low taking into account the input res. So, set a value for the output resolution based on your screen resolution from here -
cv2.imshow("bgr", cv2.resize(inRgb.getCvFrame(), (1920, 1080)))
and this will make the output go fullscreen.

ramkunchur

Have you tried this - https://www.dexterindustries.com/howto/auto-run-python-programs-on-the-raspberry-pi/ ?

ramkunchur It's mainly because the script doesn't default to a virtual env when it initiates. So, if you do not have library version interference problems with the default environment, you can install depthai wihtout virtual environment. That should work out.