Judge, a first-round conqueror of world number two Mark Williams, defeated another top-16 star to qualify for the last eight of a ranking event for just the second time.
He overcame 1998 Grand Prix runner-up Marco Fu 5-1, and said: “Marco was really nervous and that put me off.
“But the more matches you have, the more confident you get.”
World number 20 Perry knocked out Australian Neil Robertson by a 5-3 margin.
Paul Hunter brushed aside veteran Steve Davis 5-1, while local boy Ian McCulloch followed up his victory over Jimmy White by ending the title hopes of Stephen Hendry, beating him 5-3.