ViewSonic VP150M Service Manual - Page 38

ViewSonic VP150M - 15" LCD Monitor Manual

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ViewSonic September 2000 - Version 1.0 THEORY OF CIRCUIT OPERATION Service Manual VP150m Image Interpolation AM101-1 supports image interpolation to achieve better image quality. A basic image scaling algorithm replicates the input images to achieve the scaling effect. The replication scheme usually results in a poor image quality. The AM101-1 implements a proprietary interpolation algorithm to improve the image quality. The programmable interpolation is implemented with a 256-entry mapping table in the EEPROM to allow system users to adjust the bi-linear interpolation parameters to control the sharpness and smoothness quality of the image. In the default setting, the mapping table contains a straight line of slope equal to 1, i.e. the data in entry N equal to the value N. If the mapping table contains a line of slope equal to 2, then the output image will be a bit sharper than the image generated by a table with the default setting. Through an external micro-controller, users can chose among different interpolation algorithm. Dithering AM101-1 supports 16.7 million true colors for a 6-bit panel. Two dithering algorithms are implemented and users can chose between them through the external micro-controller. Confidential - Do Not Copy Page 37

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ViewSonic
September
2000
-
Version
1.0
Service
Manual
VP150m
THEORY
OF
CIRCUIT
OPERATION
Image
Interpolation
AM101-1
supports
image
interpolation
to
achieve
better
image
quality.
A
basic
image
scaling
algorithm
replicates
the
input
images
to
achieve
the
scaling
effect.
The
replication
scheme
usually
results
in
a
poor
image
quality.
The
AM101-1
implements
a
proprietary
interpolation
algorithm
to
improve
the
image
quality.
The
programmable
interpolation
is
implemented
with
a
256
-entry
mapping
table
in
the
EEPROM
to
allow
system
users
to
adjust
the
bi-linear
interpolation
parameters
to
control
the
sharpness
and
smoothness
quality
of
the
image.
In
the
default
setting,
the
mapping
table
contains
a
straight
line
of
slope
equal
to
1,
i.e.
the
data
in
entry
N
equal
to
the
value
N.
If
the
mapping
table
contains
a
line
of
slope
equal
to
2,
then
the
output
image
will
be
a
bit
sharper
than
the
image
generated
by
a
table
with
the
default
setting.
Through
an
external
micro
-controller,
users
can
chose
among
different
interpolation
algorithm.
Dithering
AM101-1
supports
16.7
million
true
colors
for
a
6
-bit
panel.
Two
dithering
algorithms
are
implemented
and
users
can
chose
between
them
through
the
external
micro
-controller.
Confidential
—
Do
Not
Copy
Page
37