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MFA-250-LS Microphotometer 
Sketch of the MFA-250-LS 
25 
In order to obtain. a bi 
nary image, each element 
of the matrix must be as 
signed to one and only o 
ne of the two classes to 
be generated. For this 
reason we implemented an 
algorithm based on the 
examination and modifica 
tion of the input matrix 
histogram. 
Assuming that data are 
affected by a gaussian 
noise and that consequen 
tly the theoric histo- 
gram is composed of two 
partially overlapped gaus 
sians (one relative to 
the noise itself and the 
other to the signal),the 
problem of determining 
the decision threshold 
can be dealt with two 
ways: 
M1: the actual histo- 
gram is interpolated, 
the parameters - mean 
value and variance - of 
MFA-250-LS FEATURES 
Support aero-photo 
Reading Format , mm“ 205x205 
Spatial Resolution,Pixel/Row 2048 
Pixel Area, um? 100x100 
Positioning error, um 2 
Orthogonality error, degrees 5x107* 
Photometric Resolution,classes 256 
Dinamic Range, decades 3 
TABLE 1