Ideal for virtual sets, BaseMatte
is a chromakeying solution from Reflecmedia.
It works by placing a ring of LEDs called a litering
around the camera lens. The LEDs shine blue or green light onto the
BaseMatte. The BaseMatte is made up of millions of microscopic glass
beads which are hemispherically coated in aluminum. This makes the
BaseMatte covered in literally millions of tiny dish shaped mirrors.
The net optical result is that any light shined onto the BaseMatte
is only reflected back at it's source. Buy
BaseMatte Online. Mattenee
is Reflecmedia's new chromakeyer specifically designed for use with
BaseMatte, designed in conjunction with Pixel Farms, Mattenee plugs
into industry standard applications.
BaseMatte advantages
Because of the unique way that the BaseMatte reflects
light only back at it's source it can do a number of things that traditional
chroma key techniques cannot. BaseMatte can work in almost no light,
because the color is generated by the LEDs and the BaseMatte only
sends like back to the camera so you can light your talent for the
virtual set they are in. This also makes it so the BaseMatte has no
spill since there are no bright lights reflecting the very color you
are trying to key off the background and onto the talent's hair and
shoulders.
BaseMatte vs Conventional Chromakey
Backdrops
Conventional blue or green screen fabric absorbs light
and requires large amounts of studio lighting to produce enough output
to perform a key against. The care and attention needed to lay conventional
fabrics require skill and experience.
In a controlled studio environment we performed a series of tests
comparing BaseMatte to conventional chromakey fabric. Using two identical
camera setups at a distance of 5 m from the background and that a
fixed aperture, we split the feed to a waveform monitor and vectorscope.
The images below show BaseMatte that on the left compared with conventional
chromakey fabric on the right.
Luminance
The left side of the image shows that crown that has a more even
luminance level than the conventional chromakey fabric on the
right.
Where the conventional fabric shows a greater light falloff with
an uneven and diffuse line from that demonstrates a consistent
luminance level with limited falloff in minimal shading.
Color
Phase Angle
Using a vectorscope we measured the phase angle of the blue signal.
The LiteRings blue LEDs show a phase angle of 206°.This illustrates
the purity of the color generated by BaseMatte and the LiteRing,
and more importantly it has very little other residual color in
the signal.
Chrominance
The level of chrominance in BaseMatte is significantly better
than the conventional chromakey fabric. This greater range of
chrominance enables your keying device to select a wider bandwidth
of blue or green.
Luminance
Color
Phase Angle
Chrominance
