IMAQ AND IEEE 1394 problem

[Big_K]

When I use IMAQ vi's to acquire and process an image from a 1409 board and a standard ntsc camera ,my IMAQ vi's for IMAQ Clamp Horizontal MAX and IMAQ Find Vertical Edge work fine and display the overlay information properly using IMAQ WindDraw. When i run the same application using the setup and acquire vi's for IEEE 1394 and a firewire camera , when i show overlay information from the Edge detection tools ,the overlays are never refreshed , meaning the IMAQ WindDraw output window Image contains every overlay , it never overwrites the others with the current overlay. The screen becomes filled with the overlay information and cannot be cleared out. Why is this ? How to work around this ? The show search line can also be turned on and shown in
the window ,but when you turn them off ,they also stay onscreen. This behavior is not that way when I use the framegrabber/ analog camera configuration.

[BruceAmmons]

It sounds like IMAQ for IEEE 1394 does not clear the overlay information when you reuse a buffer.

The simplest solution would be to use IMAQ Clear Overlay immediately after the image acquisition. This will remove any existing overlays that were left over from the previous image.

Bruce