Capturing images from camera

martin181818

Hi all ,

inPreview = previewQueue.get()

frame = inPreview.getCvFrame()

cv2.imwrite(path , frame)

I am using the above 3 lines of code to capture and save images. The problem I am facing is getting blurred images when I have moving objects. Is there any solution to modify the shutter speed or any other parameter to get better images ?

Thank you

erik

Hi martin181818 ,
It's possible, see example here, to control shutter speed / sensitivity:

  Control:      key[dec/inc]  min..max
  exposure time:     I   O      1..33000 [us]
  sensitivity iso:   K   L    100..1600

Also relevant docs here: https://docs.luxonis.com/projects/api/en/latest/tutorials/image_quality/#motion-blur
Another option is to have higher FPS, which will limit the max exposure time. Thoughts?
Thanks, Erik

martin181818

Hi erik

I am using an auto-focus camera ( oak-1 lite) so I cannot use the fixed focus feature.
what are the functions responsible for changing the exposure time and sensitivity iso as you described ?

Thank you

erik

martin181818 here's the code from the example above:

        elif key in [ord('i'), ord('o'), ord('k'), ord('l')]:
            if key == ord('i'): expTime -= EXP_STEP
            if key == ord('o'): expTime += EXP_STEP
            if key == ord('k'): sensIso -= ISO_STEP
            if key == ord('l'): sensIso += ISO_STEP
            expTime = clamp(expTime, 1, 33000)
            sensIso = clamp(sensIso, 100, 1600)
            print("Setting manual exposure, time: ", expTime, "iso: ", sensIso)
            ctrl = dai.CameraControl()
            ctrl.setManualExposure(expTime, sensIso)
            controlQueue.send(ctrl)

martin181818

erik

Thank you very much for your reply. It is working.
Just want to know what are the default values because they were not mentioned in the documentation ?

erik

martin181818 by default it's AUTO, which means ISP will apply auto exposure/sensitivity based on the scene.

Hutch07

erik Does just setting a value in manual put the exposure into "manual mode"?

martin181818

Perfect.
Thank you for all the support.

jakaskerl

Hi Hutch07
It does indeed.

Thanks,
Jaka

Hutch07

I am trying to set the MonoCamera left/Right exposure of 2 OAK-D-Pro cameras and then record the streams. Do I have to create 2 pipelines? I know the MxId for each camera.

jakaskerl

Hi Hutch07
Yes, you need to create two different pipelines (or same pipeline, just upload it to both devices). Check out this example on using multiple devices.

Thanks,
Jaka

Hutch07

I am getting "pipline already running" when trying to record.
From the record.py adding a pipeline to set exposure

# Create recording object for this device

recording = Record(save_path, device, args)

# Set recording configuration

# TODO: add support for specifying resolution

recording.setTimelapse(args.timelapse)

recording.setRecordStreams(args.save)

recording.setQuality(args.quality)

recording.setMcap(args.mcap)

devices.append(recording)
for recording in devices: recording.start() # Start recording

jakaskerl

Hi Hutch07
Probably and issue with setting the same device with another pipeline. Could you post your full code please?

Thanks,
Jaka

Hutch07

I created a public link to the code.

I cannot get it to post nicely so I created a public link:

I started modifying the exposure__iso.py example so that it will record. I might have better luck.