IMAQdx grabbing only partial image

[alexshkarin]

IMAQdx grabbing only partial image

[AlexShkarin]

OK, in this case the only solution I can see is to try to override the value if PayloadSize. For that you'll need to edit pylablib/devices/IMAQdx/IMAQdx.py file line 433 and replace it with, e.g., size_bytes=self.cav["Height"]*self.cav["Width"]*4. This will break the functionality for other pixel formats (which don't have 4 bytes per pixel), but has a chance of fixing your issue.

[AlexShkarin]

Yeah, it looks like the frame size is calculated incorrectly. This is a bit strange, though, since the code uses the IMAQdx-provided PayloadSize attribute which, one would hope, should be correct.

To start, it would be interesting to check all other camera attributes. Could you get their values by running atts=device.cav[""] and send them here? In addition it would be good to compare these with the values you get in the Acquisition Attributes tab in NI MAX, and check the possible values of Video Mode and Pixel Format parameters there.

[bhathawayML]

Hello!

This is my output (and I confirmed these are the same values I see in NI MAX):

atts = Dictionary(
'AcquisitionAttributes/Bayer/Algorithm': Bilinear
'AcquisitionAttributes/Bayer/GainB': 1.0
'AcquisitionAttributes/Bayer/GainG': 1.0
'AcquisitionAttributes/Bayer/GainR': 1.0
'AcquisitionAttributes/Bayer/Pattern': Use hardware value
'AcquisitionAttributes/BitsPerPixel': Use hardware value
'AcquisitionAttributes/HardwareMaximumQueuedBufferCount': 1000
'AcquisitionAttributes/HardwareRequeueBufferListThreshold': 50.0
'AcquisitionAttributes/Height': 1520
'AcquisitionAttributes/ImageDecoderCopyMode': Auto
'AcquisitionAttributes/OutputImageType': Auto
'AcquisitionAttributes/OverwriteMode': Get Newest
'AcquisitionAttributes/PayloadSize': 8755200
'AcquisitionAttributes/PixelFormat': BGRA 8 Packed
'AcquisitionAttributes/ReceiveTimestampMode': None
'AcquisitionAttributes/ShiftPixelBits': False
'AcquisitionAttributes/SwapPixelBytes': False
'AcquisitionAttributes/Timeout': 5000
'AcquisitionAttributes/VerticalMirror': False
'AcquisitionAttributes/VideoMode': 1920x1520 MJPG 30.00fps
'AcquisitionAttributes/Width': 1920
'CameraAttributes/BacklightCompensation/Mode': Manual
'CameraAttributes/BacklightCompensation/Value': True
'CameraAttributes/Brightness/Mode': Manual
'CameraAttributes/Brightness/Value': 0
'CameraAttributes/Contrast/Mode': Manual
'CameraAttributes/Contrast/Value': 0.0
'CameraAttributes/Exposure/Mode': Manual
'CameraAttributes/Exposure/Value': 0.125
'CameraAttributes/Gamma/Mode': Manual
'CameraAttributes/Gamma/Value': 1.0
'CameraAttributes/Hue/Mode': Manual
'CameraAttributes/Hue/Value': 0.0
'CameraAttributes/Saturation/Mode': Manual
'CameraAttributes/Saturation/Value': 64
'CameraAttributes/Sharpness/Mode': Manual
'CameraAttributes/Sharpness/Value': 2
'CameraAttributes/WhiteBalance/Mode': Manual
'CameraAttributes/WhiteBalance/Value': 4600
'CameraInformation/BaseAddress': 0
'CameraInformation/BusType': DirectShow
'CameraInformation/ModelName':
'CameraInformation/SerialNumberHigh': 2531778714
'CameraInformation/SerialNumberLow': 2530362052
'CameraInformation/VendorName': MD1200A
'StatusInformation/AcqInProgress': True
'StatusInformation/LastBufferCount': 131
'StatusInformation/LastBufferNumber': 130
'StatusInformation/LostBufferCount': 0
'Height': 1520
'PayloadSize': 8755200
'PixelFormat': BGRA 8 Packed
'Width': 1920)

[AlexShkarin]

Could you examine other possible pixel formats by checking the value of ``device.ca["PixelFormat"].values"? It could be that some other format (e.g., not involving the alpha-channel or a monochrome one) would work better for you.

[bhathawayML]

Only ['BGRA 8 Packed'] is an available option.

[bhathawayML]

That fixed it! Thank you so much. I added the following lines after the pixel_format definition to hopefully avoid problems with other formats:

if "BGRA" in pixel_format or "RGBA" in pixel_format:
    size_bytes = self.cav["Height"] * self.cav["Width"] * 4
else:
    size_bytes = self.cav["PayloadSize"]

[AlexShkarin]

Glad that worked! I'll add something similar to the next version, either by trying to figure out the number of bytes based on the pixel format, or by adding an option to specify it explicitly (for some weird packed formats).