Calculate Lens Offset - Christie DHD600-G User Manual

3.6

Calculate Lens Offset

y
The vertical image offset (shift) ranges for the projector are +/-100%
(WXGA/WUXGA) and +/-120% (HD). The horizontal image offset (shift)
range for the projector are +/-20% (WXGA/HD/WUXGA).
y
The method for calculating lens offset complies with Industry standards.
Example for Vertical lens offset:
-
At 0% offset (or on axis), the center of the image is on the lens center,
so that half of the image appears above and half appears below the
lens center.
-
At +100% offset, all (or 100%) of the image will appear above the lens
center.
-
The % offset is calculated as the ratio of the number of pixels shifted
up/down to half the image size. Examples for WUXGA:
`
`
`
`
WUXGA Projectors:
Vertical Image Offset: 0% Offset (WUXGA)
600 pixels
above lens
center.
600 pixels
below lens
center.
G Series User Manual
020-000648-01 Rev. 3 (02-2014)
Shifting up 600 pixels gives offset of 600/600 * 100% = 100%
Shifting down 600 pixels gives offset of -600/600 * 100% = -100%
Shifting up 720 pixels gives offset of 720/600 * 100% = 120%
Shifting up 240 pixels gives offset of 240/600 * 100% = 40%
No offset is applied - 0% offset.
Half of the image appears above lens center
and half of the image appears below lens
center.
Lens center
Section 3: Installation
3-5