Changing the focus of the camera via python

USB 3 Camera Dev Kits
1
  1. Where did you get the camera module(s)?
    Arducam website
  2. Model number of the product(s)?
    USB3 Camera Shield UC0593 Rev.C ( 108MP USB 3.0 Camera Evaluation Kit, Motorised Focus)
  3. What hardware/platform were you working on?
    Windows 10/python 3.10
  4. Instructions you have followed. (link/manual/etc.)
    ArduCAM_USB_Camera_Shield/Windows/Python/External_trigger_demo/ArduCam_Ext_Trigger_Demo.py at master · ArduCAM/ArduCAM_USB_Camera_Shield · GitHub
  5. Problems you were having?
    I want to change the focus via python. It works fine via the gui but i cant find documentation on how to do it in python.
  6. The dmesg log from your hardware?
    I don’t know what this means
  7. Troubleshooting attempts you’ve made?
    I read the example scripts but couldn’t find any documentation on this
  8. What help do you need?
    I would like to be able to set the focus via python.

Note, my python code for taking pictures is:
camera = Arducam.ArducamCamera()
camera.openCamera(config_file)
camera.start()
ret, data, cfg = camera.read()
image = ImageConvert.convert_image(data, cfg, camera.color_mode)
camera.stop()
camera.closeCamera()

2

@YuMu

The gui achieves various control effects by changing the configuration files, and you can change the related configuration files to achieve the effect.

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1 Like
3

Dear Edward,

Thanks for the quick reply. I changed the number behind 'DEF = ’ in the code you took in your screenshot. If I then open the GUI it indeed opens the camera with the focus I set in the config file. However, changing this number does not change the pictures I take with my python script using the below script. Should this have changed my focus/any idea what I am doing wrong? I’ve double-checked and I am changing the right .cfg file which the python script also uses.

Best,

Yuval

camera = Arducam.ArducamCamera()
camera.openCamera(config_file)
camera.start()
ret, data, cfg = camera.read()
image = ImageConvert.convert_image(data, cfg, camera.color_mode)
camera.stop()
camera.closeCamera()

4

You don’t just have to change this.

You need to set the high and low bits of the following registers according to the DEF synchronization you set
image

5

Thanks again for the rapid response. I looked up on these registers but I still don’t understand them and can’t find much documentation. From what I understand, the final numbers are the ones I should change. How should I change them? e.g. could you give 2 examples of different DEF values and corresponding high and low bit registers?

6

@YuMu

As you can see in the calculation formula, 0x0300 represents the high bit, and 0x0400 represents the low bit.
image

The default DEF is 262, which is a decimal number. The value (hexadecimal) of the corresponding register should also be 262
image