can i do image or signal processing with arduino?

Hello
can i do signal or image processing with arduino?
for exemple ca i connect a pc camera to the adruino and take photo and do processing on its?
Thank you
(sorry for my english)

Short answer - No. Look for Raspberry or Beaglebone

ok thank you
but can i do acquisition of data and store it in memory card for exemple

Not with a PC cam. I've seen there are shields specifically design for arduino to do this, take a picture and send as JPG over serial,
for example: http://store.linksprite.com/cameras/