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56 InFocus Corporation — Introduction Guide - DLP Multimedia Projector
Term Description
Edge Blending When more then one projector is used side by side to project wider content into a seamless wide
image, Edge Blending technology can be used. Edge blending can be done in the projector or with
an external video processor. Edge blending works to remove the bright visible band that occurs
when two images overlap. Edge blending will gradually fade out one of the images in the banded
zone while the adjacent image is gradually faded up.
Edge
Enhancement
A technique used to increase apparent resolution by increasing contrast around object edges.
Usually counterproductive with already high-resolution sources and can become a source of image
distortion.
EMI Electro-Magnetic Interference.
Fill Rate Given as a percentage, this characteristic indicates how smooth an image will look viewing a
particular display. An imaging system with a low fill rate will exhibit a screen door pattern in its images.
Focal Length The distance from the surface of a lens to its focal point.
Foot-Lambert
(fL)
Measurement of luminance (brightness) emitted from a surface. One foot-Lambert is equal to one
lumen per square foot. The metric equivalent of one foot-Lambert is 3.426259 nits or cd/m2. The
SMPTE standard for theater cinema is 16 fL.
Form Factor A general description of a projector or flat panel's size and shape. For example, a light projector with
a small case can be said to have a small form factor, and would be good for mobile presentation.
Similarly, a flat panel that is slim and wall mountable would be considered to have a small form factor.
FPS Frames Per Second.
Frame A frame is one complete video image. When all lines of the video image are delivered sequentially,
it is called progressive video. When the odd lines and even lines are delivered as separate fields, it is
called interlace video.
Frame
Interpolation
Frame interpolation, also called motion interpolation, is a video processing technique in which two
sequential frames of video are analyzed for motion shifts that occur between Frame A and Frame B.
Intermediate frames are then created and inserted between A and B to estimate incremental steps
in the movement. The objective is to reduce motion blur and judder in order to achieve a cleaner and
more stable video image.
Front Projection A system where the projector sits in front of the screen with the image getting reflected back to the
audience.
Full HD 3D A projector that is Full HD 3D compatible can use any of the 3D formats enabled in the HDMI

1.4
3D specification: frame packing, top/bottom, or side-by-side. These projectors are compatible with
the 1080p 3D signal from a Blu-ray player, set-top box, or other HDMI

1.4 device, but may not be
compatible with 120Hz frame sequential 3D from a computer.
Full On/Off
Contrast
Contrast is the ratio between white and black. The larger the contrast ratio the greater the ability of
a projector or flat panel to show subtle colour details and tolerate extraneous room light. There are
two methods used:
1) Full On/Off contrast measures the ratio of the light output of an all white image (full on) and the light
output of an all black (full off) image.
2) ANSI contrast is measured with a pattern of 16 alternating black and white rectangles. The average
light output from the white rectangles is divided by the average light output of the black rectangles
to determine the ANSI contrast ratio. When comparing contrast ratio, make sure you are comparing
the same type of contrast. Full On/Off contrast will always be a larger number than ANSI contrast for
a given product.
Gamma Relationship between input video voltage and output brightness. Determines how mid-tones appear
as eye sensitivity is non-linear and display devices use different methods to account for this as well
as their own display characteristics.
Glossary