taking live pictures with photoshop

hi!
i realy hope that someone can help me !!!!
i want to take live pictures with photoshop. i want to be able to capture pictures when my camera is conected to the computer . i already tried it with my webcam but the image qulity was terrible . how can i take live qulity pictures using a digital camera / video camera , is there a speciel camera or plug i can use ?
thanks

I use to use something called "snappy" to capture images from my Hi8 camera directly to PS. (on the mac) I'm sure there are several image capturing devices out there now, but i don't know them off the top of my head.

I don't think photoshop is the right tool for the job, there are some specialised software packages for this task alone.

http://www.breezesys.com/DSLRRemotePro/index.htm
http://www.download.com/Canon-Remote-Capture/3000-2294_4-10215046.html

And just look on google for Remote Capture and you'll find lots of software.
I've used the canon software in studio myself, I guess it works ok.