www.pudn.com > 医学算法.rar > window

.TH WINDOW 1 "Ultrasonics Laboratory"
.SH NAME
window - Convolve an image with a square window (averaging)
.SH SYNOPSIS
window [if=file] [of=file] [n=#] [m=#] [back=#]
.SH DESCRIPTION
.B Window
averages the pixels in a picture by convolving the
picture with a square window.
The size of the window is set with
the 
.B m=#
option.
The default values is to average pixels in a 4 x 4 window.
.PP
Normally input for this program is taken from standard
input and the results are sent to standard output.
These defaults can be changed with the 
.B if=file
and the
.B of=file
options, respectfully.
The data should be single precision floating
point numbers.
.PP
The size of the picture (n x n) is set with the
.B n=#
argument.
The default value is 128.
Finally, the background value
when averaging near the edges is set with the
.B back=#
argument.
If this is not specified then a value of
zero is used.
.SH DIAGNOSTICS
If 
.B window
can not open any file then an error is printed.