how to read multiple pgm images ?

25 次查看（过去 30 天）

显示更早的评论

kitty varghese 2017-8-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/353060-how-to-read-multiple-pgm-images

评论： Vipasha Sharma 2019-5-23

采纳的回答： Stephen23

I'm working with a database which has 472 pgm files inside a folder named faces. I want to read all 472 and store it I

also each file inside the folder is name cmu_0000.pgm..........cmu_00471.pgm

4 个评论
显示 2更早的评论隐藏 2更早的评论

Stephen23 2017-8-17

@kitty Varghese: today I formatted your code correctly for you. In future you can do this yourself: simply select the code text and then click the {} Code button.

Stephen23 2017-8-17

在 MATLAB Online 中打开

@kitty Varghese: there is no point in getting dir to search for files with a .m extension:

thepath = ... *.m';

if what you are after is .pgm files. Do not hard-code how many files there are:

for i=1:472,

when it is much more robust to use numel. I would also recommend avoid i as a variable name.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Stephen23 2017-8-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/353060-how-to-read-multiple-pgm-images#answer_278292

编辑：Stephen23 2017-8-17

在 MATLAB Online 中打开

Something like this perhaps (untested):

P = 'C:\Users\kitty\Dropbox\non negative factorization\faces\face.test\test\face';
D = dir(fullfile(P,'*.pgm'));
C = cell(size(D));
for k = 1:numel(D)
    C{k} = imread(fullfile(P,D(k).name));
end

Note I loaded that data into a cell array: this is because images commonly are stored as a 3D matrix: as an alternative you could store them is a 4D numeric array.

12 个评论
显示 10更早的评论隐藏 10更早的评论

kitty varghese 2017-8-21

编辑：Walter Roberson 2017-8-21

在 MATLAB Online 中打开

close all;
clear all;
clc;
% cbcldata - read face image data from cbcl database
% This is where the cbcl face images reside
P = 'C:\Users\kitty\Dropbox\non negative factorization\faces\face.test\test\face';
% Create the data matrix
D=dir(fullfile(P,'*.pgm'));
C=cell(size(D));
for k=1:numel(D)
      C{k}=imread(fullfile(P,D(k).name));
      col(:,k)=C(:);
      V{k}=C(:);
  end