Optoma WU1500 User manual - Page 65

Calculate lens offset, Examples for WUXGA

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ADDITIONAL INFORMATION Calculate lens offset The vertical image offset (shift) ranges for the projector are +/-120% (WUXGA) and +/-140% (HD). The horizontal image offset (shift) range for the projector is +/-50% (HD/WUXGA). 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: ±± 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% WUXGA Projectors: Vertical Image Offset: 0% Offset (WUXGA) No offset is applied - 0% offset. Half of the image appears above lens center and half of the image appears below lens center. 600 pixels above lens center. 600 pixels above lens center. Lens center English 65

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English
65
ADDITIONAL INFORMATION
Calculate lens offset
The vertical image offset (shift) ranges for the projector are +/-120% (WUXGA) and +/-140% (HD). The horizontal
image offset (shift) range for the projector is +/-50% (HD/WUXGA).
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:
±
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%
WUXGA Projectors:
Vertical Image Offset: 0% Offset (WUXGA)
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
600 pixels
above lens
center.
600 pixels
above lens
center.