If they are still pictures, they are data. You should be able to read them on your computer.
It looks more like cheep DVD disc they used for burning, and local photo shop DVD drive cannot read it.
Try to open it on your machine, may be you will have better luck.
It could also be DVD+R and their drive is not able to read those.
It is also also possible they formatted disc for packet writing, in that case IsoBuster will be required to get the pictures off.