POF-ML
bc - Brightness/Contrast
This PU apply a simple polynomial function with brightnessOffset and a contrastGain. The function is the following:
\( \mathit{output} = (\mathit{input} \times \mathit{contrastGain}) + \mathit{brightnessOffset}\)
Syntax
bc(child,brightnessOffset,contrastGain)Input
This PU takes in input one PU with one sample per pixel.
Parameters
- child - is the child PU.
- brightnessOffset - is the offset (integer value).
- constrastGain - is the gain (float value).
Output
The output is a PU with one unsigned int sample per pixel (0 for background).
bg - Background value
The bg PU allow the user to specify an additional background value.
Syntax
bg(child,bgValue)Input
This PU takes in input one PU with one sample per pixel.
Parameters
- child - is the child PU.
- bgValue - is the additional background value.
Output
The output is a PU with one sample per pixel. The output data type is the same as in input.
eq - Histogram equalisation
The eq PU performs a histogram equalisation based on the given histogram.
Syntax
eq(child,histo)Input
This PU takes in input one PU with one sample per pixel. The expected data type is integer.
Parameters
- child - is the child PU.
- histo - is the identifier of an histogram.
Output
The output is a PU with one unsigned int sample per pixel (0 for background).
extr - Extract value
The extr PU put all the pixels to background expect the ones that are equal to the specifier value.
Syntax
extr(child,extacted_value)Input
This PU takes in input one PU with one sample per pixel. The expected data type is integer.
Parameters
- child - is the child PU.
- extacted_value - is the value to be extraced.
Output
The output is a PU with one sample per pixel. The output data type is the same as in input.
gam - Gamma function
The gam PU apply a gamma function on the input values. The function is the following:
\( \text{output} = \text{A} \times \text{input} ^ \gamma\)
Syntax
gam(child,A,gamma)Input
This PU takes in input one PU with one sample per pixel. The expected data type is integer.
Parameters
- child - is the child PU.
- A - is the gain of the function gamma.
- gamma - is the gamma value of the function.
Output
The output is a PU with one unsigned int sample per pixel (0 for background).
gau - Gaussian equalisation
The gau PU performs a gaussian equalisation based on the given histogram.
Syntax
gau(child,histo,mean,stdev)Input
This PU takes in input one PU with one sample per pixel. The expected data type is integer.
Parameters
- child - is the child PU.
- histo - is the identifier of an histogram.
- mean - is the mean of the gaussian model.
- stdev - is the standard deviation of the gaussian model.
Output
The output is a PU with one unsigned int sample per pixel (0 for background).
noht - No histogram transform
The noht PU performs a conversion from 16bits to 8bits by keeping only the 8 most significant bits.
Syntax
noht(child)Input
This PU takes in input one PU with one sample per pixel. The expected data type is integer.
Parameters
- child - is the child PU.
Output
The output is a PU with one unsigned int sample per pixel (0 for background).
sta - Automatic stretching
The sta PU performs an automatic stretching based on the given histogram.
Syntax
sta(child,histo,leftSat,rightSat)Input
This PU takes in input one PU with one sample per pixel. The expected data type is integer.
Parameters
- child - is the child PU.
- histo - is the identifier of an histogram.
- leftSat - is the the left saturation applied to the histogram.
- rightSat - is the the right saturation applied to the histogram .
Output
The output is a PU with one unsigned int sample per pixel (0 for background).
stc - Column stretching
The stc PU performs a statistic imposed stretching on each column of the product to improve the rendering of the offshore area of sar product. This stretching is based on precalculated statistics per column (mean and standard deviation).
Syntax
stc(child,rcs,output_mean,output_stdev,smooth_radius)Input
This PU takes in input one PU with one sample per pixel. The expected data type is integer.
Parameters
- child - is the child PU.
- rcs - is the identifier of the Radar Cross Section statistics (mean and standard deviation per column).
- output_mean - is the user requested output mean of each column.
- output_stdev - is the user requested output standard deviation of each column.
- smooth_radius - is the radius of the smooth filtering apply to the “rcs”.
Output
The output is a PU with one unsigned int sample per pixel (0 for background).
sti - Interval stretching
The sti PU performs an interval stretching based on stretching points defined by the user.
Syntax
sti(child,x1,y1,x2,y2,...,xn,yn)Input
This PU takes in input one PU with one sample per pixel. The expected data type is integer.
Parameters
- child - is the child PU.
- xi - is the abscissa of the stretching point "i" (input definition).
- yi - is the ordinate of the stretching point "i" (output definition).
Output
The output is a PU with one unsigned int sample per pixel (0 for background).
str - Linear stretching
The str PU performs a linear stretching based on user defined bounds
Syntax
str(child,a,b)Input
This PU takes in input one PU with one sample per pixel. The expected data type is integer.
Parameters
- child - is the child PU.
- a - is the left bound of the stretching.
- b - is the right bound of the stretching.
Output
The output is a PU with one unsigned int sample per pixel (0 for background).
sts - Statistics stretching
The sts PU performs a linear stretching based on a given output mean and standard deviation
Syntax
sts(child,histo,output_mean,output_stdev)Input
input description
Parameters
- child - is the child PU.
- histo - is the identifier of an histogram.
- output_mean - is the requested global output mean.
- output_stdev - is the requested global output standard deviation.
Output
The output is a PU with one unsigned int sample per pixel (0 for background).