is this still an issue? If so, can you provide more information, like, what version of LabVIEW and CANoe you're using, etc.?
What do you mean by image? AFAIK there are no images on the CAN Bus only frames.
Let me see if I got this correctly: Your HMI is a certain device connected to the CAN Bus that displays certain data in form of images (e.g. open door = true gives you an image of a car with an open door) or integrated into images (e.g. speed overlaid on a map display). You now want to acquire that image with CAN Bus.
If that's the case, I have a very similar setup here and in my case I'm sure that the images are not transmitted on the CAN Bus. I wouldn't design it this way, because a) a (standard) CAN Frame consists of 8 Bytes, whereas a picture easily has kB and b) a CAN Frame can be preempted easily by a higher priority one and you are left with just the roof of a car with an open door...
The way this is normally implemented is, you have all the picture data on the HMI and it is triggered with certain CAN Frames or updated with data from CAN. All you can probably do with just a CAN interface is listen to the data on CAN which on CANoe 8 is done via Network Variables afaik.