Here is a list of all documented variables with links to the struct/union documentation for each field:

A

B

C

D

E

F

G

H

I

J

K

L

M

N

O

P

R

S

T

U

V

W

X

Y

- x -

• x : VlDsiftKeypoint, VlFrameDisc, VlFrameEllipse, VlFrameOrientedDisc, VlFrameOrientedEllipse, VlSiftKeypoint