Vidikron Vision 150 User Manual

Filter: The proper filter setting is automatically set for virtually all signals, and rarely needs to 
be changed. It applies a low pass filter for noise reduction in the incoming input signal, 
particularly for HDTV or SDTV. Applied in the analog domain before sampling, this filtering 
removes high frequencies and thus reduces pixel phase noise (note this also reduces signal 
bandwidth). Override only if standard pixel tracking and phase adjustments do not 
adequately clear up a “noisy” video signal, or if a graphics signal appears overly “soft.” Both 
instances indicate that “Filter” may be set to the wrong option. 

Sharpness: “Sharpness” changes the amount of high-frequency detail in a video image so 
that edges remain clearly defined. It can be particularly useful if a significant “Noise 
Reduction” adjustment has caused the image to appear too soft. Adjust until the display is as 
sharp as desired, keeping in mind that because “Sharpness” adds some high frequencies 
back into the image, it can also reintroduce a certain degree of noise. 

Noise Reduction: Noise Reduction is similar to the “Filter” control, but operates in the 
post-sampling digital domain with a more subtle effect. Higher settings are most useful for 
clearing up noisy RGB images such as those from a PC. Adjust as desired, keeping in mind 
that reducing noise (which reduces high frequencies) may also soften the image. 

Color Space: “Color Space” determines how the color components of an analog input signal 
are decoded for accurate color in the display. With the Vision 140/150, this should always be 
set to RGB. 

Decoder Adjust: This sub-menu is not applicable to the Vision 140/150.

White Balance: Good RGB or white balance — that is, the white and black levels for each of 
the three primary colors, red, green and blue — ensure that images from analog sources 
other than decoded video have maximum contrast without crushing black or white.

By default (and in an “Auto Setup”), the projector automatically determines the best input 
levels by monitoring image content and adjusting the controls appropriately; further 
adjustment is typically not required to obtain proper blacks or whites. 

However, for a very unusual source exhibiting one or more overly high black levels (typically 
caused by a noisy source causing black level spikes), an experienced technician may prefer to 
use the White Balance menu. These adjustments, which together serve as a calibration 
process compensating for differences in sources and cabling, enable an experienced 
technician to perfect the source image input levels and eliminate the “overshoot” and 
“undershoot.”