Cannot set the resolution of RGB camera in depth aligned mode

Hello,

I'm in possession of a OAK-D Wide camera for robot navigation application.
My goal is simple : I want to recover the RGB and an aligned filtered depth the fastest way possible at low resolution.

I start with the disparity processing to get the smoothest result; I use a decimation filter of 3 to accelerate the process. (the resulting size is 221x140)

Then I've added the RGB camera output and I set resolution to the same size of the disparity map (eg.camRgb.setPreviewSize(221, 140))

Unfortunately, I get the warning :

[1944301031B09D2E00] [1.1] [0.692] [ColorCamera(0)] [warning] Unsupported resolution set for detected camera OV9782, needs 800_P or 720_P. Defaulting to 800_P

And the following result (processed depth and RGB) is resized to 800_p, which is logical since the disparity is resized to the RGB resolution.

My question : How can I set the RGB resolution to match to the disparity size to get the result the fastest way possible ? Is there a workaround ?

best regards,

Neuro

#!/usr/bin/env python3

import cv2
import depthai as dai
import numpy as np

# Closer-in minimum depth, disparity range is doubled (from 95 to 190):
extended_disparity = False
# Better accuracy for longer distance, fractional disparity 32-levels:
subpixel = True
# Better handling for occlusions:
lr_check = True

# Create pipeline
pipeline = dai.Pipeline()
# Get device 
device = dai.Device()

queueNames = []

# Define sources and outputs
camRgb = pipeline.create(dai.node.ColorCamera)
monoLeft = pipeline.create(dai.node.MonoCamera)
monoRight = pipeline.create(dai.node.MonoCamera)
depth = pipeline.create(dai.node.StereoDepth)

color_out = pipeline.create(dai.node.XLinkOut)
disp_out = pipeline.create(dai.node.XLinkOut)

color_out.setStreamName("rgb")
queueNames.append("rgb")
disp_out.setStreamName("disp")
queueNames.append("disp")

# init RGB camera
camRgb.setBoardSocket(dai.CameraBoardSocket.CAM_A)
camRgb.setPreviewSize(221, 140)
camRgb.setFps(60)

# get calibration data 
try:
    calibData = device.readCalibration2()
    lensPosition = calibData.getLensPosition(dai.CameraBoardSocket.CAM_A)
    if lensPosition:
        camRgb.initialControl.setManualFocus(lensPosition)
except:
    raise

# Properties
monoLeft.setResolution(dai.MonoCameraProperties.SensorResolution.THE_400_P)
monoLeft.setCamera("left")
monoLeft.setFps(60)
monoRight.setResolution(dai.MonoCameraProperties.SensorResolution.THE_400_P)
monoRight.setCamera("right")
monoRight.setFps(60)

# Create a node that will produce the depth map (using disparity output as it's easier to visualize depth this way)
depth.setDefaultProfilePreset(dai.node.StereoDepth.PresetMode.HIGH_DENSITY)
depth.initialConfig.setMedianFilter(dai.MedianFilter.MEDIAN_OFF)
depth.setLeftRightCheck(lr_check)
depth.setExtendedDisparity(extended_disparity)
depth.setSubpixel(subpixel)
depth.setSubpixelFractionalBits(3)
# align color + depth data
depth.setDepthAlign(dai.CameraBoardSocket.CAM_A)

# Init post processing spatial filter
config = depth.initialConfig.get()
config.postProcessing.spatialFilter.enable = True
config.postProcessing.spatialFilter.holeFillingRadius = 8
config.postProcessing.spatialFilter.numIterations = 3
config.postProcessing.thresholdFilter.minRange = 400
config.postProcessing.thresholdFilter.maxRange = 4000
config.postProcessing.decimationFilter.decimationFactor = 3
depth.initialConfig.set(config)

# Linking
camRgb.video.link(color_out.input)
monoLeft.out.link(depth.left)
monoRight.out.link(depth.right)
depth.disparity.link(disp_out.input)


# Connect to device and start pipeline
with device:
    # start pipeline 
    device.startPipeline(pipeline)
    # init frame 
    frame_RGB = None
    frame_disp = None
    # init cv2 windows
    cv2.namedWindow("RGB")
    cv2.namedWindow("Depth")

    while True:

        latestPacket = {}
        latestPacket["rgb"] = None
        latestPacket["disp"] = None

        queueEvents = device.getQueueEvents(("rgb", "disp"))
        for queueName in queueEvents:
            packets = device.getOutputQueue(queueName).tryGetAll()
            if len(packets) > 0:
                latestPacket[queueName] = packets[-1]
        
        if latestPacket["rgb"] is not None:
            frame_RGB = latestPacket["rgb"].getCvFrame()
            # plot result 
            cv2.imshow("RGB", frame_RGB)

        if latestPacket["disp"] is not None:
            frame_disp = latestPacket["disp"].getFrame()
            frame_disp = (frame_disp * (255 / depth.initialConfig.getMaxDisparity())).astype(np.uint8)
            frame_disp = cv2.applyColorMap(frame_disp, cv2.COLORMAP_JET)
            cv2.imshow("Depth", frame_disp)


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