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morefigs / pymba

Python wrapper for Allied Vision's Vimba C API
MIT License
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unable to change OffsetX or OffsetY #122

Closed skywo1f closed 4 years ago

skywo1f commented 4 years ago

In the vimba viewer, there is an option to change the offset of the pixel-screen where I would like to pull data from. These are called OffsetX and OffsetY. I tried to change them via:

    # read a feature value
    featureOY = camera.feature('OffsetY')
    value = featureOY.value
    # set the feature value
    featureOY.value = 1                      #404

But I get: /mnt/xavier1ssd/pymba-cam/examples/camera$ python3 camera_color_video.py Traceback (most recent call last): File "camera_color_video.py", line 63, in featureOY.value = 1 #404 File "/usr/local/lib/python3.6/dist-packages/pymba/feature.py", line 40, in value self._access_func('set', self.info.featureDataType)(value) File "/usr/local/lib/python3.6/dist-packages/pymba/feature.py", line 125, in _set_int raise VimbaException(error) pymba.vimba_exception.VimbaException: The value was not valid; either out of bounds or not an increment of the minimum.

setting them to 0 works fine, but I just see the upper corner of the vision range instead of the center.

jakove commented 4 years ago

Before you can set the offset you have to change the image size.

For example: If you want to set "OffsetY" to 200 you have to decrease "Height" by 200.

skywo1f commented 4 years ago

That worked. I was changing the height and width, but I was doing it after the offset. When I changed it to before, everything worked.