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Vidikron Vision Model 15 Installation/Operation Manual 47
Overscan: Some SDTV/EDTV programs are produced based on the assumption that older
television sets may not display the outer edges of the broadcast picture area.
Overscan
effectively hides these inactive, outer edges of the image. (For HDTV, DVDs and other video
sources, overscan is generally not necessary or desirable.)
• Overscan Type: There are two overscan types:
• Crop adds a mask at the top, bottom, left and right edges.
• Zoom adds a factor to the scaling of the source image. Anything outside of the original
image area is removed.
• Overscan Adjust: This control defines the amount of overscan applied to the image. The
range is from 0 to 5.
•In Crop mode, each increment adds a mask at the left and right edges of the source
image equal to 1% of the displayed horizontal resolution (2% total), and at the top and
bottom edges equal to 1% of the displayed vertical resolution (2% total). A setting of 5,
for example, crops the image 5% on all sides or 10% total.
•In Zoom mode, each increment adds a factor to the scaling of the source image so that
the vertical and horizontal resolutions are 100% plus 2% increments of the size
determined by the aspect ratio function. A setting of 5, for example, zooms in on the
image 5% on all sides or 10% total.
Figure 4-7 illustrates the effect of each overscan setting.
Figure 4-7. Overscan Examples
YUV/RGB Adjust: Use the settings in the YUV/RGB Adjust menu to fine-tune 480p and
higher-resolution signals for optimum picture quality.
• H. Position: Use the up- or down-arrow buttons ( , ) to select H. Position. Then, use
the right-arrow button ( ) to shift the image to the right; use the left-arrow button ( )
to shift the image to the left.
• V. Position: Use the up- or down-arrow buttons ( , ) to select V. Position. Then, use
the right-arrow button ( ) to shift the image up; use the left-arrow button ( ) to shift
the image down.
• Clock: If you notice flickering or vertical noise when displaying computer images, adjust
the
Clock setting to correct the issue.
Overscan Type Crop
Overscan Adjust 0
No Overscan Crop Zoom
4:3
16:9
= Source Image Area = Mask (Crop) Area = Screen (16:9)