Some questions about auto focus camera on Jetson Nano

[Margarito Lehmann]

The first question:

I received my first IMX219-auto focus camera for Jetson Nano a few days ago. But i don’t know how to operate the auto focus function. I tried this command: $ DISPLAY=:0.0 gst-launch-1.0 nvarguscamerasrc ! ‘video/x-raw(memory:NVMM), width=3280, height=2464, format=(string)NV12, framerate=(fraction)20/1’ ! nvoverlaysink -e But it cannot perform the focus by using the up-down arrow keys. I also tried the sample code downloaded from your website, but also cannot do manual focus. How can i do

The second question:

I want to: 1. press a button on GUI to perform auto focus; 2. use arrow keys (or other keys) to perform manual focus, as it do in your demo

 

[cydu]

[wong]

Hi @Margarito Lehmann ,

1. We are a recently updated repository and added a manual focus example, you can check it.

2. At present, we do not provide GUI examples, more advanced usage requires you to implement it yourself.

• This reply was modified 1 month ago by wong.

[cydu]

Hi Wong:

Thank you for adding the manual focus test code to your repository. I tried your examples, but there some error, as shown below:

File “/home/amtd/JN_Camera_Test/JetsonCamera.py”, line 10, in <module>
from Queue import Queue
ModuleNotFoundError: No module named ‘Queue’.

So can not run.

Where can I find or install the Queue module?

Thanks.

[wong]

Hi @cydu ,

Sorry, I only tested on python2.7, omit the test of python3, now this problem has been fixed. Thanks for your feedback.

[cydu]

Hi @ Wong:
I tested the manual focus function. Now it works. Thank you very much for your codes.

In the meantime, I also tested the auto-focus code. It is found that the camera stops at focus_distance = ~500 (at this position, the image is very blurred), but actually the focus_distance is 380 (at this position, the image is most clear). Can you please retest your code?

[cydu]

I saw a very clear image (it should be the position of focus_distance=380) during the auto focus processing, but the camera stopped at wrong position, capturing blurred image.

[wong]

Hi @cydu ,

Autofocus script is a very simple implementation of autofocus. It will fail in some scenes. Try to find some scenes with more textures to run the script.

[cydu]

Hi, Wong:

Thanks to your Focuser.py, I can do manual focus for camera 1 of JN-B01.  Now I need to do the same for camera 2 of JN-B01. I found the address setting of camera 1 is: CHIP_I2C_ADDR = 0x0C. What’s it for camera 2? Or what i need do in order to conduct manual focus for camera 2?

Thank you in advance.

[wong]

Hi @cydu ,

The i2c address is the same, but the difference is the i2c bus. On JN-B01, the i2c bus of CAM0 is 7, and the i2c bus of CAM1 is 8.

[Author]

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