OV64A40 - Blue Images Randomly

Raspberry Pi Cameras
1

1. Where did you get the camera module(s)?
ArduCam

2. Model number of the product(s)?
B0483

3. What hardware/platform were you working on?
Raspberry Pi

  1. Instructions you have followed. (link/manual/etc.)
    ArduCam Docs Page

5. Problems you were having?

Sometimes the images are coming out with a blue colour or layer. This happens randomly. It is consistent for both cameras attached to the same Raspberry Pi 5.

I have two cameras attached to the RPi 5. Both are taking photos together (at the same time). Sometimes they both give a blue image. Sometimes they give a normal image.

The camera is taking photos every 1 minute. So I have plenty of examples.

Then the camera returns to normal.

See examples (blue):

2024-03-13-12-52-01 (1)
2024-03-13-12-52-01 (1)1920×1442 359 KB

2024-03-13-12-52-01
2024-03-13-12-52-011920×1442 347 KB

Not Blue:

2024-03-13-13-11-01
2024-03-13-13-11-011920×1442 264 KB

Questions:
1. Why does it do this?
2. How do I stop the blue photos from happening?

2

Hi,

It looks like the white balance is not working as expected.

Can you tell me how you capture the images? Via code or command or something else.

3

Hi Dion,

I just use:

libcamera-still --camera 0 -o image.jpg -n

4

i have same problem with

libcamera-jpeg --camera 0 --width 9152 --height 6944 -o "+ path +" -n -t 1 --lens-position " +lensPosition;
5

Hi @wallarug @henri
Please follow the steps below to run the bug-report script:

  1. Reboot your device.
  2. Execute the following command to download the bug report tool:
wget -O arducam-camera-bug-report https://github.com/ketai-dhr/arducam-camera-bug-report/releases/download/tools/arducam-camera-bug-report
  1. Set executable permissions for the tool:
chmod +x ./arducam-camera-bug-report
  1. Execute the tool to generate the bug report:
./arducam-camera-bug-report
  1. This will output an “arducam-bug-report.txt” file in the current directory. Please put this file on the google drive or other place so that I can check it.

I need information of your Raspberry Pi to reproduce the problem on our side.

Thanks
Dion

6 
https://drive.google.com/file/d/1FtC67fRCeiuvUXIcgkFfy-EBEn_9gaFG/view?usp=sharing
7

Hi Henri,
It is like a “lip-service”, hhh. But actually, I’m gona reproduce the problem this afternoon.
Just update the status and tell you that I do not forget this case.

8

also i have to mention that in my case the fluorescent lightbulb in the ceiling is creating interference pattern on the images so if u are unable to reproduce the lighting might be the issue.

9

Hi Henri,
what a coincidence. I was just about to get back to you and you gave the hint.
Yeah, I took 50 pictures with the command:

libcamera-still --camera 0 -o image.jpg -n

All these 50 pictures look normal. I attach one of them below:

image
image1329×902 63.9 KB

What’s this henri?

10

I was guided by the holy spirit

This is what it is, i meant flourescent tube. This picture i took with my android camera.

IMG_20240319_1057051
IMG_20240319_10570511920×1440 128 KB

But the arducam cameras get the interference pattern. I dont consider it a bug but a feature. Here u can see the interference pattern lines on picture with arducam 64mp (:

test
test1920×1456 56 KB

This happens with max res 9152x6944 (i scaled down the uploaded image) but for example i tested it with 1280x720 it does not happen. Something related to frequencies and exposure time.

11

I just confirmed by testing that the fix for the blue images is to turn off lighting in the office. The product im developing will have LED light source anyways so i dont need to change the office lighting solution.
Some more info on the flourescent lighting interference pattern:
https://xdaforums.com/t/interference-pattern-on-camera-with-fluorescent-lighting.1231173/

12

My issue is not flurentent lighting. I have the blue images occurring without this type of light.

13

what kind of light do you have in your room?
have u tried turning it off and then make pictures, are the pictures still blue?