ARToolKit mirror

[skywalkerbr]

Hi every one!
How can I flip a image from a webcam like a mirror, for artoolkit?
I have this code:
import viz
viz.go()

#Add ARToolkit extension
ar = viz.add('artoolkit.dle')

#Create camera using first available webcam
camera = ar.addWebCamera()

#Create marker from pattern file
marker = camera.addMarker('ar/taca',width=1000)

#Add logo model
ball = viz.add('Taca_Fifa_AR.wrl',pos=(200,200,-400),cache=viz.CACHE_CLONE)
ball.setScale(0.1,0.1,0.1);

pic = viz.addTexture('Sb_Taca.jpg')


ball.texture(pic)


#Link logo model to marker sensor
viz.link(marker,ball)
ball.setPosition(200,200,0)