ANSI-C program: lee.c
NAME
lee - Lee filter for power files of type float (Lee 1980).
SYNOPSIS
gamma_map <input_data> <output_data>
<width> <nlooks> <bx> [by]
| <input_data> | input data (file of type float) |
| <output_data> | output data (file of type float) |
| <width> | number of samples/row |
| <nlooks> | number of looks |
| <bx> | filter size in x direction (number of cols) |
| [by] | filter size in y direction (number of rows)(default=bx) |
EXAMPLE
lee 1352_1610.pwr1 1352_1610.pwr1_gamma_map 2500 4 11
11
INSTALLATION
Source code lee.c in ./src. For compilation adjust and use
Makefile: Executable version lee in ../bin
AVAILABILITY
Uses type definition file typedef_ISP.h.
DESCRIPTION
Lee filtering is primarily used to remove speckle while
preserving edges. Input parameters are the filter box size and
number of looks. Different filter sizes will greatly affect the
quality of the processed image. If the box size is to small, the
noise filtering is not effective. If the filter is too large,
fine structures will be lost. The nlooks parameter refers to the
number of looks of the radar image. It is used to compute the
noise variance.
OPTIONS
Number of looks of input image and userdefined filter window size
(odd numbers).
SEE ALSO
typedef_ISP.h, average_filter enh_lee frost .
DIAGNOSTICS
All messages are generally self-explanatory.
NOTES
None.
© Copyrights for Documentation, Users Guide and Reference Manual by Gamma Remote Sensing, 2004.
awi, UW, CW, last change 19-Apr-2004.