Instruction manual

Description of the data path
8.10 DSNU & blemish correction (MF-131B only)
s
with a special DSNU reduction function,
xtending the shading correction.
rrection to every pixel in order to equalize the dark level
f the pixels. This function also enables correction of single and double blemished pixels by
simultaneously but can be switched on/off separately.
n the left picture (without correction) it can be seen that over the complete field of view there
dark pixels and blemished pixel(s)
ith brightness around 192(U). With pure DSNU correction the spread is considerably smaller.
In order to further reduce the dark signal non uniformity (DSNU) of the CMOS sensor to level
similar to CCD sensors, the MARLIN F-131B is equipped
e
The DSNU function applies an additive co
o
replacing them with their neighbourhood pixels. DSNU and blemish pixel correction are generated
The following screenshots demonstrate how it works:
O
is a certain spread of the histogram, indicating non uniform
w
Figure 43: Effect of DSNU correction
The table below shows the advanced register map, required to control this functionality.
Register Name Field Bit Description
0xF1000290 DSNU_CONTROL Presence_Inq [0] Indicates
presence of this
feature (read
only)
ComputeError [1] tbd
--- [2..3]
ShowImage [4] Show correction
data as image
ComputeData [5] Compute new
DSNU correction
data
ON_OFF [6] DSNU correction
On/Off
OFF: High
Busy [7] Com
p
utation in
MARLIN Technical Manua
l
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