Is there a way to get the AWB gain lively?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

Hi,
I need to lively get the AWB gain from ISP and write it to sensor AWB gain registers. So I’m asking is there a way to get the AWB gain lively on jeston nano?

Thanks
Bing

3

hello bing.yan,

please refer to MMAPI documentation, Argus::IAutoControlSettings::getWbGains.
BTW,
you should also calling Argus::ICaptureSession::repeat to queue a request with new wbGain settings,
please check below for an example,

iAutoControlSettings->setWbGains(bayerGains);
iAutoControlSettings->setAwbMode(AWB_MODE_MANUAL);
iSession->repeat(request.get());
1 Like
4

Hi Jerry,
Thank you so much!
Bing.Yan

5

Hi Jerry,
Sorry I have one more question after having a quick look to bayerGains in your example. My question is about bayerGains it has 4 elements, are the 4 elements of fixed order like R G G B or the order is dynamic, following sensor bayer format like BGGR, RGGB GRBG ?
printf("Intensity: r:%0.3f gO:%0.3f gE:%0.3f b:%0.3f "
“WBGains: r:%0.3f gO:%0.3f gE:%0.3f b:%0.3f\n”,
bayerAverages[0],
bayerAverages[1],
bayerAverages[2],
bayerAverages[3],
whiteBalanceGains[0],
whiteBalanceGains[1],
whiteBalanceGains[2],
whiteBalanceGains[3]);

            BayerTuple<float> bayerGains(whiteBalanceGains[0], whiteBalanceGains[1],
                whiteBalanceGains[2], whiteBalanceGains[3]);
6

hello bing.yan,

that’s a good question. it’s by default as RGGB.
you may using IBayerHistogram by calling r(), gEven(), gOdd(), b() for specific orders.
for instance,

    std::vector< BayerTuple<uint32_t> > histogram;
    const IBayerHistogram* bayerHistogram = interface_cast<const IBayerHistogram>(iMetadata->getBayerHistogram());

    for (uint32_t i = 0; i < histogram.size(); i++) {
    ...
        histogram[i].r();
        histogram[i].gEven();
        histogram[i].gOdd();
        histogram[i].b();
7

Thanks Jerry! I am currently using QT to draw the camera frames, the frames are captured by GST-launch-1.0 command, under this condition, can I still use the iAutoControlSettings->getWbGains method you mentioned above? Is there any way? I use QT because I need to draw some boxes recognized by AI detection on camera frames to show.

Bing.Yan

8

hello bing.yan,

that’s not supported, you may running with $ gst-inspect-1.0 nvarguscamerasrc to confirm all the support elements.
please refer to Argus sample applications to have implementation.

9

I need to capture frame of camera out and show it by QT interface so that I can draw some boxes on it at some positions of frames, do you know if I use argus interface, can I get the frame(ISP output) out for QT usage?
I saw a Frame::getImage interface which can get Image buffer data out by a interface Image::mapBuf , do you know what’s the format of the data got by Image::mapBuf? I saw it seems have some header bytes for special usage.

Thanks!
Bing.Yan

10

this topic has been solved, let’s open another new discussion thread for following up.

12

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