how to read multiple pgm images ?

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kitty varghese
kitty varghese 2017-8-17
评论： Vipasha Sharma 2019-5-23
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
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Stephen23
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
Stephen23 2017-8-17
@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.

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Stephen23
Stephen23 2017-8-17
编辑：Stephen23 2017-8-17
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.
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kitty varghese
kitty varghese 2017-8-21
编辑：Walter Roberson 2017-8-21
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
this works perfectly .
Thanks @Stephen Cobeldick
Vipasha Sharma
Vipasha Sharma 2019-5-23
can anyone help me with code for reading multiple HDF files?

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