• DepthAI-v2

  • Different PreviewSize links for RGB camera needed

I need different preview feeds from the createColorCamera() module. I have parallel stages of simple preprocessing to do with the video feed, like cropping to a different size. So a 300x300 preview, a 512x512 preview,..... But I am unable to create multiple CamRgb(s) (from createColorCamera()). I need to send the processed images/video stream to other parts of the code later on.

Should I just use Manipulate?
Is this a supported action?
Is there a syntax/example I can use?

Or should I simply pass them out to an XLinkOut() and use it from them (using getFrame())?

  • erik replied to this.

    Hello tarocal, I would use multiple image manip nodes (it is supported, yes).

    Here is a simple example:

    #!/usr/bin/env python3

import cv2
import depthai as dai

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

# Define a source - color camera
cam = pipeline.createColorCamera()
cam.setPreviewSize(640, 480)
cam.setInterleaved(False)
camOut = pipeline.createXLinkOut()
camOut.setStreamName("rgb")

manip1 = pipeline.createImageManip()
manip1.initialConfig.setResize(300, 300)
manipOut1 = pipeline.createXLinkOut()
manipOut1.setStreamName("manip1")
manip1.out.link(manipOut1.input)

manip2 = pipeline.createImageManip()
manip2.initialConfig.setResize(150, 150)
manipOut2 = pipeline.createXLinkOut()
manipOut2.setStreamName("manip2")
manip2.out.link(manipOut2.input)

cam.preview.link(camOut.input)
cam.preview.link(manip1.inputImage)
cam.preview.link(manip2.inputImage)


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

    qRgb = device.getOutputQueue(name="rgb", maxSize=4)
    qManip1 = device.getOutputQueue(name="manip1", maxSize=4)
    qManip2 = device.getOutputQueue(name="manip2", maxSize=4)

    while True:
        inRgb = qRgb.tryGet()
        inManip1 = qManip1.tryGet()
        inManip2 = qManip2.tryGet()

        if inRgb is not None:
            cv2.imshow("rgb", inRgb.getCvFrame())
        if inManip1 is not None:
            cv2.imshow("manip1", inManip1.getCvFrame())
        if inManip2 is not None:
            cv2.imshow("manip2", inManip2.getCvFrame())

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