I have this code and I want to perform this process on multiple images. kindly help me through code.

 Kindly help me, i am new to Matlab.

clc;
[filename, filepath] = uigetfile ({'*.jpg';'*.bmp';'*.png'}, 'File Selector');
img = strcat(filepath, filename);
img = imread(img);
figure(1),imshow(img);
FaceDetect = vision.CascadeObjectDetector;
FaceDetect.MergeThreshold = 7 ;
BB = step(FaceDetect,img); figure(2),imshow(img);
for i = 1:size(BB,1)
    rectangle('Position',BB(i,:),'LineWidth',3,'LineStyle','- ','EdgeColor','r');
end
for i = 1:size(BB,1)
    J= imcrop(img,BB(i,:));
    figure(3),subplot(6,6,i);
    imshow(J);

end

Answer 1

[Jan]

[filename, filepath] = uigetfile ({'*.jpg';'*.bmp';'*.png'}, 'File Selector', ...
        'MultiSelect', 'on');
filename = cellstr(filename);
for iFile = 1:numel(filename)
  img = fullfile(filepath, filename{iFile});  % Better than STRCAT
  img = imread(img);
  figure    % New figure, do not specify the index
  imshow(img);
  FaceDetect = vision.CascadeObjectDetector;
  FaceDetect.MergeThreshold = 7 ;
  BB = step(FaceDetect,img); figure(2),imshow(img);
  for i = 1:size(BB,1)
     rectangle('Position',BB(i,:),'LineWidth',3,'LineStyle','- ','EdgeColor','r');
  end
  figure
  for i = 1:size(BB,1)
    J= imcrop(img,BB(i,:));
    subplot(6,6,i);
    imshow(J);
  end
end

[saeeda saher]

instead of selecting i want to read images from folder.

[Image Analyst]

I guess you overlooked my Answer below, which gave code for doing exactly that.

[Jan]

@saeeda: Your question was not clear in what you exactly want.

All you need is to implement the code suggested in the link posted by Image Analyst:

FileList = dir(fullfile(Folder, '*.png'));  % Adjust to your needs
for iFile = 1:numel(FileList)
  file = fullfile(Folder, FileList(iFile).name))
  ...
end

You will find similar answers if you search in the net or in this forum for "process sequence of files".

Answer 2

[Image Analyst]

Sample code is in the FAQ. http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F Take it and adapt it.

[Jan]

+1. While I like the contents of this wikia page, I hate to get commercials there. When I want to learn something about processing the sequence of files, this information is a waste of time:

 The FANDOM 100 — From Luke Skywalker to Pickle Rick, breaking down
 2017’s most iconic characters from movies, TV and video games.

[Image Analyst]

I don't like ads either. Many/most web sites have them. Luckily we've trained ourselves to ignore them so we don't waste too much time reading them.