Dalsa Piranha3, User Manual

Page: 47 / 91

Piranha 3 User Manual
DALSA 03-032-10216-02
47
overview on performing flat field correction.
Example:
cpa 1 600
Setting a Pixel’s PRNU Coefficient
Purpose: Sets an individual pixel’s PRNU coefficient.
Syntax:
spc i i
Syntax Elements:
i
The pixel number from
1
to
sensor pixel count
.
i
Coefficient value in a range from
0
to
28671
where:
Example:
spc 1024 10000
Setting a range of Pixel PRNU Coefficients
Purpose: Sets a range of pixel PRNU coefficients.
Syntax:
spr i i x
Syntax Elements:
i
The first pixel number of the range.
i
The last pixel number of the range.
x
Coefficient value in a range from 0 to 28671 where:
Notes: •
The first pixel of the range must be less than the last.
Example:
spr 4001 4096 0
Subtracting Background
Purpose: Use the background subtract command after performing flat field
correction if you want to improve your image in a low contrast
scene. It is useful for systems that process 8-bit data but want to
take advantage of the camera’s 12 bit digital processing chain.
You should try to make your darkest pixel in the scene equal to
zero.
Syntax:
ssb t i
Syntax Elements:
t
Tap selection. Allowable range is
1
to
8
, or
0
for all taps.
i
Subtracted value in a range in DN from
0
to
4095
.
prnu coefficient =
i
4096
1 +
prnu coefficient =
i
4096
1 +