sed - wget - work with arguments -

i have list of uri: uri.txt with

category1/image1.jpeg category1/image32.jpeg category2/image1.jpeg 

and on, , need download them domain example.com wget, additional changing filename (final @ save) categoryx-imagey.jpeg

i understand, should read uri.txt line line, add "http://example.com/" in front of each line , change "/" "-" in each line.

what have now:

1. reading uri.txt [work]
2. adding domain name in front of each uri [work]
3. change filename save [fail]

i'm trying with:

wget 'http://www.example.com/{}' -o '`sed "s/\//-/" {}`' < uri.txt 

but wget fails (it depends type of quotation sign i'm using: ` or ') with:

wget: option requires argument -- 'o' 

or

sed `s/\//-/` category1/image1.jpeg: no such file or directory sed `s/\//-/` category1/image32.jpeg: no such file or directory 

could tell, i'm doing wrong?

here how that:

while read line ;   wget "http://example.com/$line" -o $(echo $line|sed 's=/=-=') done < uri.txt 

in other words, read uri.txt line line (the text being placed in $line bash variable), before performing wget , saving modified name (i use sed delimitor, avoid escaping / , making more readable)