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=======
pymba
=======
pymba is a Python wrapper for the Allied Vision Technologies (AVT) Vimba C API. It wraps the VimbaC.dll file included in the AVT Vimba installation to provide a simple Python interface for AVT cameras. It currently supports most of the functionality provided by VimbaC.dll.
Installation
============
* Install the Vimba SDK from AVT to the default directory.
* Run the AVTDriverInstaller tool and install the AVT Vimba SDK drivers.
* Install pymba.
Usage
=====
Testing installation
--------------------
If Vimba SDK and pymba are installed correctly, then the following code should give the installed Vimba version. No camera is needed.
from pymba import *
with Vimba() as vimba:
print vimba.getVersion()
Interacting with cameras
------------------------
Discover, open, manipulate, and capture frames from a camera.
from pymba import *
import time
# start Vimba
with Vimba() as vimba:
# get system object
system = vimba.getSystem()
# list available cameras (after enabling discovery for GigE cameras)
if system.GeVTLIsPresent:
system.runFeatureCommand("GeVDiscoveryAllOnce")
time.sleep(0.2)
cameraIds = vimba.getCameraIds()
for cameraId in cameraIds:
print 'Camera ID:', cameraId
# get and open a camera
camera0 = vimba.getCamera(cameraIds[0])
camera0.openCamera()
# list camera features
cameraFeatureNames = camera0.getFeatureNames()
for name in cameraFeatureNames:
print 'Camera feature:', name
# get the value of a feature
print camera0.AcquisitionMode
# set the value of a feature
camera0.AcquisitionMode = 'SingleFrame'
# create new frames for the camera
frame0 = camera0.getFrame() # creates a frame
frame1 = camera0.getFrame() # creates a second frame
# announce frame
frame0.announceFrame()
# capture a camera image
camera0.startCapture()
frame0.queueFrameCapture()
camera0.runFeatureCommand('AcquisitionStart')
camera0.runFeatureCommand('AcquisitionStop')
frame0.waitFrameCapture()
# get image data...
imgData = frame0.getBufferByteData()
# ...or use NumPy for fast image display (for use with OpenCV, etc)
import numpy as np
moreUsefulImgData = np.ndarray(buffer = frame0.getBufferByteData(),
dtype = np.uint8,
shape = (frame0.height,
frame0.width,
1))
# clean up after capture
camera0.endCapture()
camera0.revokeAllFrames()
# close camera
Interacting with the Vimba system
---------------------------------
Get a reference to the Vimba system object and list available system features.
from pymba import *
with Vimba() as vimba:
# get system object
system = vimba.getSystem()
# list system features
for featureName in system.getFeatureNames():
print 'System feature:', featureName
Interacting with transport layer interfaces
-------------------------------------------
Get a reference to an interface object and list available interface features.
from pymba import *
with Vimba() as vimba:
# get list of available interfaces
interfaceIds = vimba.getInterfaceIds()
for interfaceId in interfaceIds:
print 'Interface ID:', interfaceId
# get interface object and open it
interface0 = vimba.getInterface(interfaceIds[0])
interface0.openInterface()
# list interface features
interfaceFeatureNames = interface0.getFeatureNames()
for name in interfaceFeatureNames:
print 'Interface feature:', name
# close interface
interface0.closeInterface()
Handling Vimba exceptions
-------------------------
from pymba import *
try:
with Vimba() as vimba:
except VimbaException as e:
print e.message
Known issues
============
* Not all API functions are wrapped (most are). For full list see vimbadll.py.
* Only 32-bit VimbaC.dll (version 1.2.1) under Windows has been tested.
* Colour cameras and GigE cameras have not been tested.
* The VimbaC.dll file location has been hardcoded in vimbadll.py. It should be easy to change if needed.
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