Hi Luxonis Team and Community,
We are currently integrating and testing an OAK 4 D camera. We are observing significant asymmetric blur.
https://discuss.luxonis.com/d/5248-sharpness-issue-on-right-side-of-image-with-oak-d-s2-fixed-focus
The Issue
While the center of the image is sharp, we noticed that two adjacent corners are significantly blurrier than the other two.
"Good" Corners: Blur is contained to a very small area (approx. 0.5% width / 2% height).
"Bad" Corners: The blur extends significantly further into the frame (approx. 3% width / 10% height
Here is a rough visualization of the defect pattern we are seeing:
+-----------------------------------------------------------------------------+
| [BAD CORNER] [BAD CORNER] |
| ~Larger blur region ~ ~Larger blur region ~ |
| |
| |
| SHARP CENTER FRAME |
| |
| |
| ~Smaller blur region ~ ~Smaller blur region ~ |
| [GOOD CORNER] [GOOD CORNER] |
+------------------------------------------------------------------------------+
Specifications
Host: Ubuntu 22
Firmware version: Luxonis OS RVC4 1.21.1
depthai version: 3.2.1
Example code used for building streaming code: https://docs.luxonis.com/software-v3/depthai/examples/video_encoder/video_encode
Troubleshooting Steps Taken:
1.To rule out software configuration or general focus issues, we have attempted the following:
a. Manual Focus Sweep: We iterated through manual focus values 0..255. At no point did the affected corners come into focus. When the center is perfectly sharp, the "bad" corners are completely washed out.
b. ISP Settings:
Set Sharpness to 4 (Max).
Set LumaDenoise to 0.
Result: No improvement in the affected regions.
c. Resolutions/FPS: The behavior is consistent across multiple resolutions and framerates.
2. We rotated the camera setup by 180deg to ensure that this wasn't a lighting issue. No improvement seen
3. We checked that the camera was pointed perfectly perpendicular to the surface we were recording
I have attached sample images below showing the difference between the "Good" side and the "Bad" side.
Could you please advise on this?
Any help here would be greatly appreciated!
