I was playing around with dmtxread from the Ubuntu Jaunty repos on the weekend. I was trying to take a picture of a 2D barcode with the tablet's camera and then use dmtxread to find out what the barcode said.

The results were disappointing. The biggest problem is the tablet's camera. It doesn't focus when you get close to the barcode, so I could get a readable picture of a big 10x10 code on a toothpaste tube, but I couldn't get a clear picture of the code on the inside of my second tablet or the codes being used on preprinted postage in Canada. I even used Gimp (again, on the tablet ) to increase the contrast and sharpen the image, but the source image was just too poor...

Frustrating!