matlab读写pgm文件

读文件 1 @4 l# |, g3 m/ X$ g$ p+ t

%function disp_

pgm(

pgm_image_name)

%不支持文件中有注释

pgm_image_name='tmp.

pgm';

f = fopen(

pgm_image_name,'r');

if f == -1

error(['Could not open file ',

pgm_image_name]);

end / t2 V; a( c$ l1 A$ C' j6 P

[imgsize, num]=fscanf(f, 'P5\n%d\n%d\n255\n'); . J1 [& _. g! k; I( x$ E

if num~=2,error('error num');end

image=[];

for h=1:imgsize(2)

image=[image fread(f,imgsize(1),'uint8')];

end

image=image.'; 3 ?4 @# c% O% D2 O   v3 ]

fclose(f); . I, \4 B! Y( @5 r7 \" n

imshow(image);

写文件

% Load image

% image = imread(imageFile);

% If you have the Image Processing Toolbox, you can uncomment the following 9 p, m5 N" g7 v4 [! j2 P

% lines to allow input of color images, which will be converted to grayscale.

if isrgb(image)

image = rgb2gray(image); 6 W/ I+ U; o9 B; |   I0 c3 U

end + q7 [1 P, r: I& t& e) m/ {

[rows, cols] = size(image); 

% Convert into PGM imagefile, readable by "keypoints" executable

f = fopen('tmp.

pgm', 'w');

if f == -1 / p/ D' b: r- F2 q

error('Could not create file tmp.

pgm.'); ' J/ R' e6 F! b3 L" ?- `

end & G( C& n/ {8 I' ?

fprintf(f, 'P5\n%d\n%d\n255\n', cols, rows); 1 x9 ?5 x4 M' ^

fwrite(f, image', 'uint8');

fclose(f);