Processing The Digital Image - Kodak DirectView CR 825 Theory Manual

THEORY GUIDE
10DEC05
If you find both the horizontal and the vertical points of the sample on an imaginary matrix,
TG4825-1
Page similar to the one in the graphic, the result indicates one pixel in the digital image.
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Continual analog input values are changed to output values. In this process, the replacement
of small ranges of analog input values with one digital output value occurs. The digital output
value indicates one pixel of information on the TOUCH SCREEN MONITOR.
The output is a linear digital signal. The CR 825/850 SYSTEM emits a 16-bit digital signal
with a total signal range of 65,536 levels. Because it is not possible for the human eye to see
this range of separate values, the CR 825/850 SYSTEM changes the 16-bit linear image data
to 12-bit log data. This 12-bit log provides data from 0 - 4095 values. These values are used
in the CR 825/850 SYSTEM.

Processing the Digital Image

Digital imaging allows users to improve diagnostic images by processing the images. After the
digital image is made, the digital data is processed using parameters set up in the software.
In the CR 825/850 SYSTEM, this processing occurs in the INTERNAL PC.
Examples of image processing used for digital images:
• segmentation
• tone scaling
• edge enhancement
• brightness - level
• contrast - window
Radiography Theory