Streaming JPEG images via USB to a PDA

My assignment is to display JPEG images streamed to a PDA via USB at 10 frames per second or more. Since Lab View does not provide a means of decoding JPEG data resident in memory (only files can be opened), I developed a DLL to decode the JPEG data. The decoding of a 320x240 image takes <100 milliseconds. Displaying that image by Draw Flattened Pixmap & "picture" requires ~400 milliseconds (?!?). If a larger image is sent, the display time increases even though only 320x240 pixels are actually displayed. I've attached a screenshot of the block diagram.
Is there an alternative to Draw Flattened Pixmap and "picture" that would be more efficient?
Why does Draw Flattened Pixmap require the removal of the padding byte in 32 bit aligned 24 bit image data?
Is there a way to scroll through the image if it is larger than the display?
Is there a way to hide & redisplay controls (server address, port, run, stop, exit, etc)?
Can the Windows banner be removed from the display?
Can the Windows keyboard icon be removed from the display?
Can you suggest any other optimization?
Thanks for your time,
Dan
Attachments:
StreamJPEG1.jpg ‏534 KB

Hi Dan,
There is not an alternative to Draw Flattened Pixmap on the PDA. The only VIs available are those on the Functions Palette. I am not sure why it requires the removal of the padding byte in 32 bit aligned 24 bit image data, that is something that I would need to ask a developer.
To scroll through your image, you would need to use the Horizontal Scrollbar Visible or Vertical Scrollbar Visible property nodes. These property nodes are unsupported by PDA. To see a list of what property nodes are supported, please see this help file. I would also suggest going to our Product Suggestion Center and creating a suggestion.
To hide and redisplay controls, you can use a property node for the control and turn the visibility on and off. When you create a property node for a control, select "visible". You can then set this to either true or false.
Finally, the Windows keyboard and the Windows banner cannot be removed from display. I hope that I was able to answer your questions, please be aware that there are many limitations with the Windows Mobile operating system. Let me know if there is anything else I can do to help, thanks Dan.

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