saving jpg file off rs170 feed using non supported framegrabber

[Lenox]

since imaq vision can open a jpg file....is there a really cheap way to use a frame grabber that pulls from a rs170 line that will save an image and then exe. the labview program?

i guess you can do all of this via c++ or has anyone created a dll that integrated a 20$ ebay framegrabber off ebay...im not so sure if you need a sdk pack that works with the frame grabber... i really have no experience programming ..thanks i saw a program that integrated (video for windows) using a snappy grabber..but is there an easy way to all of this? Recomendations?

[MarcoPolo5]

You might want to look at IMAQ USB driver which allows you to capture images from USB cameras.

Trying to save pictures to file and reopen them would create an extremely slow video feed.

The External Library Support vi's (in the Vision Utilities >> Image Management >> External Library Support palette) are available for getting pointers to the memory location where image buffers are setup - you could possibly call into a 3rd party frame grabber's dll and copy image into the image memory setup by LabVIEW. This would be rather difficult and require a very low level understanding of your framegraber and it's dll's.

Hopefully this helps out

[Lenox]

the aquisition rate will only be approximatly once every 3 seconds.....is there a list of supported usb cameras? if another camera is needed will code have to be rewritten?

[Lenox]

i found a cheap card with a sdk package. thanks

[DJ_L.]

Hey Lenox,

There is not an acual list of supported USB cameras, and NI does not officially support USB cameras, but we do have some good documents that will point you in the right direction when it comes to NI IMAQ and USB cameras. First off, I would suggest going to the following knowledgebase link: <a href="http://digital.ni.com/public.nsf/allkb/274A74A901399D0486256F32007295F9"> Acquiring Images in LabVIEW Using a USB Camera</a>. This knowledgebase points out some common USB camera's websites. Also, you can find at the end of this document a link to the NI-IMAQ for USB website.

To answer your other question about other code being written, you should not have to write other code, but it is a possibility depending on your camera.

I hope this answers your questions. Let us know if you have any further questions. Thanks and have a great day.

Regards,

DJ L.