HDR on Oak1-PoE

fgfaria

I'm running a modified version of the code in luxonis/depthai-coreblob/main/examples/python/Camera/camera_hdr.py (only modification was the insertion of IP address to connect as my Oak1 is PoE)
trying to get HDR to work on Oak1 camera, but haven't had success. Controls show some minor image impact and dar parts of the image are still very dark. Overall behavior seems just like regular auto-exposure. That doesn't change my changing all values in range for hdr-exposure-ration or hdr-local-tone-weight.
For reference, the exact same code for Oak4 works perfectly, and HDR clearly corrects darker parts of the image preserving the rest.

I have tried many depthai versions ranging from 3.5 to 3.10

Oskar-Luxonis

Hey fgfaria - could you share the output of getConnectedCameraFeatures()? The 12 MP IMX378 OAK-1 PoE does not support HDR; only the 32 MP IMX582/LCM48 variant does.

If it is IMX582, please test with manual exposure and ISO at 10 FPS. RVC2 auto-exposure can make the middle and short HDR exposures too dark. Start with an exposure ratio of 4, local tone weight of 1.0, and exposure base set to middle.

Thanks,
Oskar

fgfaria

Hi Oskar, thanks for your reply! Mine is LCM48. I tested it further today, in brighter scenarios, and it looks like there is an active HDR, although it seems to be much less effective than the one in oak4. Is this expected?

Oskar-Luxonis

Hey fgfaria - yes, this is expected. The LCM48 supports the same QBC HDR principle, but the RVC2 auto-exposure is not HDR-aware and can make the shorter exposures too dark. OAK4 has a newer HDR/ISP implementation, so its result can be stronger.

For the LCM48, try manual exposure and ISO at 10 FPS, with an exposure ratio of 2 or 4, local tone weight at 1.0, and exposure base set to middle.

Thanks,
Oskar