Scanner detected in root

[Ferrero Horacio]

I've in my computer installed a PCTV Board and a USB-HP Scanner both are
recognized by Fedora.

My problem is : If I want to have the initial choice of input devices,
giving me not only the video card choice but also my scanner too,  I've
to launch  "sudo xsane" because if I said only xsane I do not get my
scanner detected.

Could someone explain me why?  

Thanks in advance

Horacio