Four directions can be adjusted as you like
any place you can projection
what is keystone correction ?
So keystone correction it is a feature that allows you to put your projector less accurately but still can get a square image output.
And what 4D correction can do?
That is no matter your projector have off-axis function or in positions high or low,it is about you do not neeed keep it parallel to the screen,
with 4D (4 Direction) Keystone Correction will allow you to adjust the distorted picture, making the askew image square again
Is there any difference we can see for the difference Keystone function?
Four directions can be adjusted as you like
any place you can projection
The correction of the upper and lower trapezoids
can only be projected in front of the screen
Then what is 4D keystone correction?
The ordinary keystone correction only allows users to place the projector in less accurate positions, but still need to make sure the lens is roughly parallel to the screen.
However, to make the projection get rid of the limit of placement. Volto engeneer have started their study about this early since early years,just want to bring more convence to our customer
even if projecting from the side and you can also adjust the deformed image into a better square shape,so now you can place the projector any where they like ,and can easily adjust to image correction
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