Optical Flow from AVI file

Hi,
I am trying to calculate and display the optical flow field from a .AVI file. I am working from the example Optical Flow.vi, however I cannot get it to work and am getting a 'IMAQ Vision: Incompatible image size error' on the optical flow function box. As far as I can see the 2 image inputs to the optical flow function are both in 8-bit greyscale format as they should be.
I am using my own greyscale conversion sub vi but this is again taken from one of the examples. I've included both the vi's as well as the .avi file im using. Hopefully someone can point out where I've gone wrong.
Thanks,
Oscar.
Attachments:
optical_flow_1.png ‏214 KB
convert_greyscale.png ‏20 KB

Hi Oscar,
I've had a quick look at your code and although I can't identify the exact reason why it's not working I have spotted a few things.
If I scroll the image I see the vectors appear briefly, so I think the image might be getting ovewritten somehow after the motion flow overlay is drawn
Also, I'm not sure a dedicated Grayscale conversion sub VI is needed, and yours creates a new image reference every time it runs which isn't ideal as it will continue to allocate more memory.
I think maybe a more linear flow of code may help combat your issues, I've written a quick VI that implements motion flow from an AVI, it seems to work fine with the AVI files I tested, so hopefully this might help:
Regards,
Adam Brown
Applications Engineer
National Instruments UK

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Format                           : AVI
Format/Info                      : Audio Video Interleave
Format_Commercial_IfAny          : DV
Format profile                   : OpenDML
File size                        : 1.79 GiB
Duration                         : 8mn 52s
Overall bit rate                 : 28.9 Mbps
Video
ID                               : 0
Format                           : DV
Duration                         : 8mn 52s
Bit rate mode                    : Constant
Bit rate                         : 24.4 Mbps
Width                            : 720 pixels
Height                           : 480 pixels
Display aspect ratio             : 4:3
Frame rate mode                  : Constant
Frame rate                       : 29.970 fps
Standard                         : NTSC
Chroma subsampling               : 4:1:1
Bit depth                        : 8 bits
Scan type                        : Interlaced
Bits/(Pixel*Frame)               : 2.357
Stream size                      : 1.78 GiB (100%)
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ID                               : 0-0
Format                           : PCM
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Channel(s)                       : 2 channels
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