Matlab Programs for Image Processing
1.The utility functions
The functions provided are :
� rawread(filename, xdim, ydim, precision) - to load image called filename
having the dimension xdim and ydim, and which is stored as datatype precision
� rawwrite(filename, matrix, precision) - to save matrix in file called
filename with datatype precision
.
For internal storage purposes Matlab treats an image as a matrix. For example to load an
image into a matrix try
image=rawread(‘ctscan.raw’, 256, 256);
You can choose to treat rawread, rawwrite as black boxes. The source code is given at
the end of this document.
Rawread.m
;---------------------------------------
%Reads a raw intesity image file, written with a given precision (by
default 'uint8').
% img = RAWREAD(fname,ncols,nrows,precision);
%
function raw=rawread(fname, cols, rows, prec)
if nargin==3, precision='uint8';
elseif nargin==4, precision=prec;
else, error('Wrong number of arguments! Syntax:
"rawread(fname,cols,rows)"'); return; end
fid = fopen(fname,'r');
raw = fread(fid,[cols,rows],precision)';
fclose(fid);
;----------------------------
;rawwrite
function count=rawwrite(fname, array, prec)
if nargin==2, precision='uint8';
elseif nargin==3, precision=prec;
