Image processing
Pearleye Technical Manual
V2.2.0
38
Short introduction: Two-point correction
(A, B, E, J, K, N)
The two-point correction is the most elaborate correction module of the
Pearleye P-007 LWIR
/
Pearleye P-030 LWIR
camera models. For this reason
initially a general survey of the two-point correction functioning shall be given.
By means of the two-point correction (also called
gain offset correction
) usu-
ally, the distinctive underground structure of the microbolometer sensor can be
equalized. The target is to transmit the individual characteristic curve of each
pixel to a set characteristic curve, being valid for all pixels. In order to achieve
this result, initially the effective characteristic curve of each single pixel is
determined by taking up data samples. A linear characteristic curve is supposed
so that two data samples are sufficient for a definite determination. By means
of recording two reference images at the scene temperatures T
A
and T
B
the data
samples can be determined for all pixels. Furthermore the digital set values J
and K each belonging to the temperatures T
A
and T
B
are determined.
Owing to the four parameters mentioned above, the two-point correction is now
able to modify the gain and the offset of each pixel characteristic curve in a way
that it is congruent with the set characteristic curve. Therefore, in an optimum
case, an image structure, caused by the sensor, does no longer occur. The below
mentioned diagram tries to exemplary explain the facts on the basis of one sin-
gle pixel characteristic curve:
Note
For more information see Chapter
Note
For more information see Chapter
This will probably be sufficient for most users, due to the fact
that the determining and adjustment of nearly all parameters
is already executed ex factory and normally, no user interven-
tion is necessary at all.
For more extensive details of the current parameters see Chap-
ter
