How to get histogram of multiple cameras?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Xavier NX
1

Hi,
I am using argus to capture images. I create a capture session with 3 camera device and submit the request and I found that the histogram i get from each frame consumer is the same. I want to implement the auto exposure based on histograms of three images, how can get the histogram of them?
Thanks.

3

Did you try argus_histogram -d for different sensor to clarify the problem?

4

Hi Shane,

Thanks for your reply. I did try argus_histogram for every camera and we confirmed that each histogram is ok. They run at the same time in three different terminals.
But In my case, I use one capture session with 3 camera devices and wait for the captur_compelet_event. I try to get histogram as the sample argus_histogram did. And all I got was only one capture_complete_event and one histogram of camera[0]. Should I calculate the histogram manully like the sample syncSensor?

Thank you!

5

Sorry to tell we didn’t verify this use case.
Could you try calculate manually, otherwise I would suggest to implement by multiple session.

Thanks

6

Alright I’ve managed to calculate the histogram respectively by using CudaEGLStreamFrame Consumer. Thank you.

7

Hi Shane,

As I mentioned above, I’ve got the cuda hitogram and adjusted the exposure succesfully by CudaEGLStreamFrame Consumer. But when I create another stream with EGL Frame consumer(save jpeg file), I got errors like:

[ STATUS] [1668145126.150498390] Start SYNC_CMD capture command
Session::updatePerfHints()
updatePerfHints(): guid=0ll, CaptureIntent=1
updatePerfHints(): NvCameraCoreUseCase_Preview
NvPHSSendThroughputHints: sensorId=0, m_usecase=4, m_type=1, m_value=30, m_timeout_ms=1000

NvPHSSendThroughputHints: sensorId=0, m_usecase=4, m_type=15, m_value=0, m_timeout_ms=1000

updatePerfHints(): guid=1ll, CaptureIntent=1
updatePerfHints(): NvCameraCoreUseCase_Preview
NvPHSSendThroughputHints: sensorId=1, m_usecase=4, m_type=1, m_value=30, m_timeout_ms=1000

NvPHSSendThroughputHints: sensorId=1, m_usecase=4, m_type=15, m_value=0, m_timeout_ms=1000

updatePerfHints(): guid=2ll, CaptureIntent=1
updatePerfHints(): NvCameraCoreUseCase_Preview
NvPHSSendThroughputHints: sensorId=2, m_usecase=4, m_type=1, m_value=30, m_timeout_ms=1000

NvPHSSendThroughputHints: sensorId=2, m_usecase=4, m_type=15, m_value=0, m_timeout_ms=1000

CoordinatedCam does not support 0 Bayer and 6 YUV output buffers.

SCF: Error NotImplemented: unsupported output buffer config (in src/components/CaptureSetupEngineImpl.cpp, function chooseGenInstFunc(), line 255)
SCF: Error NotImplemented:  (propagating from src/components/CaptureSetupEngineImpl.cpp, function doGetInstructions(), line 2210)
SCF: Error NotImplemented:  (propagating from src/components/CaptureSetupEngine.cpp, function getInstructionList(), line 300)
SCF: Error NotImplemented:  (propagating from src/components/CaptureSetupEngine.cpp, function setupCC(), line 214)
SCF: Error NotImplemented:  (propagating from src/api/Session.cpp, function capture(), line 821)
disposing CC 0 Session 0
(Argus) Error NotImplemented:  (propagating from src/api/ScfCaptureThread.cpp, function run(), line 109)

I wonder what caused this error and how can I solve it? What I need is to capture three cameras at the same time and calculate the average exposure level then save the image.

Thank you.

9

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