The
STANFORD COMPUTER OPTICS Dynamic Range Expansion System enhances the
resolution of any image intensified camera system up to 32 bit,
independent of the
previous A/D conversion.
The data processing is explained by the following diagram:
The black dots give the analog readings at the sampling instances. The
blue dots are the corresponding digitized values. Without any
additional resolution expansion the resolution is confined to the blue
lines that give the available quantization levels for the actual A/D
conversion.
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The
blue line that connects the blue circles give the actual average
value after accumulating the number of digitized data
samples designated on the abscissa. It can easily be seen, that the
frame adding technology used in the dynamic range expansion system
severely overcomes the quantization level restrictions from the
hardware A/D conversion. In addition, this accmulation technology do
not impose additional noise components as is done by interference-prone
high-bit A/D conversion electronics.
Our dynamic range expansion system provides a fully 32 bit data
processing and image editing
software.
This allows for frame adding
with up to 2^16 16 bit data words without any loss of accuracy.
The resolution gain obtained from the frame accumulation process is
given by
res. gain =
number of added data samples
or
res. gain [bits] = log2(number of added data samples). |
