Oce 3050 - Page 47

Setting up the Océ 3050 Microfilm Scanner 47
THRESHOLDING / TRACK AREA This control selects the size of the area
surrounding each pixel of interest over which the background tracking system
examines the image to establish the maximum and minimum film densities and
to set the MAX and MIN tracking levels. The control has three possible values
- NARROW, MEDIUM and WIDE which are accessed in turn by clicking on
the control icon. The NARROW setting is the default and allows tracking of
rapid changes in either foreground or background densities and will prove very
useful in poor quality images, multipage images, and the like. For images
having very thick lines or solid areas, it may be preferable to use the MEDIUM
or WIDE settings as a means of preventing the tracking out of solid foreground
data.
INVERSE FILM This control can be set to either NEGATIVE or POSITIVE.
The vast majority of microfilm images are negative and the default
NEGATIVE setting will be correct. Positive images require that the image
enhancement functions recognise high density as foreground and low density
as background and setting the POLARITY control to POSITIVE enables
Image processing to work with positive images just as well as with negative
images. Switching to POSITIVE also inverts data on the image display screens
so that they appear correctly as black lines on a white background.
ENHANCEMENT The enhancement controls can be used to sharpen the
scanned image. The mode of the enhancement can be set to fixed / 3X3 / 5X5
and the amount of enhancement controlled by a slider.
ENHANCEMENT / NONE No filter applied (default).
ENHANCEMENT / FIXED SHARPEN This applies a "gentle" sharpening filter
to the image. This filter is fixed and can not be adjusted
ENHANCEMENT / CUSTOM 3x3 Applies a 3x3 sharpening filter to the image.
The effect of the filter can be adjusted by the slider to increase or decrease the
effect of the filter.
ENHANCEMENT / CUSTOM 5x5 Applies a 5x5 sharpening filter to the image.
The effect of the filter can be adjusted by the slider to increase or decrease the
effect of the filter.
SPECKLE Moving this control increases the amount of speckle removal
LOAD This enables a previously defined set of parameters to be recalled for
use. On pressing this button another window is displayed within which the
name of the Template to load can be selected.