59 62 134 D 3407
120
D 3407
.
208.01.10
.
02 07.2009
3 Operation
Sirona Dental Systems GmbH
Analysis tools
Operator’s Manual SIDEXIS XG
ª
The
"Transfer"
window appears.
Preparation
To better explain the functionality, the window
"Transfer"
has to be switched
from
"Gamma"
to
"Linear"
display.
1. Click the
"Gamma"
field with the left mouse button.
ª
A pop-up menu opens.
2. Select the
"Linear"
function.
ª
The
"Transfer"
window switches from the
"Gamma"
to the
"Linear"
display.
Configuration
●
"Transfer"
function
The
"Transfer"
function is displayed here as a line above the histogram.
This line has a linear form in its basic setting.
● Histogram
The histogram shows a statistical distribution of all points of the active X-
ray image above a linear scale from black to white.
The height of the bar above a given position on the scale indicates the
number of pixels having the corresponding gray level in the image.
●
"Linear"
function
The
"Linear"
function ensures that the gray tones contained in the window
are evenly distributed over the 8-bit gray levels (256 gray tones) during
windowing of the
"Transfer"
function.
Windowing (for the "Linear" function)
Example screen
The basis for achieving enhanced display of an X-ray image is to ensure that
the color profile actually available in the histogram is evenly distributed over
the 256 gray levels of the screen display. Furthermore, an area inside the
histogram of the X-ray image must be selected via windowing.
The histogram used in the example shows no color values at the beginning of
the dark area (on the left) and at the end of the bright area (on the right).
1. Use the slider in the
"Transfer"
window below the histogram to limit the
color space to be used.
2. Push the slider to the location where the available histogram begins and
ends.
3. The
"Transfer"
function is now linear only in the delimited area. Gray
levels located outside of the delimited area are displayed as either black
or white.
