Dot indexing is not supported for variables of this type.

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Md Shahidul Islam
Md Shahidul Islam on 17 Aug 2021
Edited: Adam Danz on 17 Aug 2021
I faced this problem here. Please help me. I already try with give solution .
image_files = [];
for f = isfolder(image_path)
if f.endsWith([".jpg",".jpeg",".png", ".PNG"]) //problem is here
image_files.append(f);
end
end
Problem
Dot indexing is not supported for variables of this type.
Error in undistortion>undistorb_images (line 51)
if f.endsWith([".jpg",".jpeg",".png", ".PNG"])
  2 Comments
Md Shahidul Islam
Md Shahidul Islam on 17 Aug 2021
Yes, I am trying to recursively search directories and build a list of paths to image files. Here is my full code:
undistorb_images([], []);
function [tvec, rvec, camera_matrix, dist] = read_wp2c(input_name)
%input_name = "output_wp2camera.json";
raw = fileread(input_name);
input_params = jsondecode(raw);
camera_matrix = input_params.camera_matrix;
dist = input_params.dist_coefs;
tvec_json = input_params.translational_vectors;
%tvec = struct2cell(tvec_json);
rvec_json = input_params.rotational_vectors;
%rvec = struct2cell(rvec_json);
tvec = [];
rvec = [];
len = length(tvec_json);
for i = 1:len
%tvec.append(array(tvec_json(image + string(i))))
%tvec.append.tvec_json(i);
tvec = struct2cell(tvec_json(i));
%[A{:}]
%tvec.append(input_params.translational_vectors.image0);
%rvec.append(array(rvec_json(image + string(i))));
rvec = struct2cell(rvec_json(i));
end
end
function undistorb_images(inputParams, result)
%if result is None:
if isempty(result)
input_name = "output_wp2camera.json";
[tvec, rvec, camera_matrix, dist] = read_wp2c(input_name);
else
tvec = result(4);
rvec = result(3);
camera_matrix = result(1);
dist = result(2);
end
if isempty(inputParams)
image_path = "D:\matlab_code\Calibration_Task\images\";
else
image_path = inputParams.opencv_storage.settings.Images_Folder;
end
image_files = [];
files = [dir(fullfile(image_path,'*.jpg')); dir(fullfile(image_path,'*.png')); dir(fullfile(image_path,'*.jpeg')); dir(fullfile(image_path,'*.PNG'))];
%files = dir(fullfile(image_path, '*.(jpg|png)'));
L = length(files);
for i=1:L
image_files=files(i).name;
%disp(file)
end
% for f = dir(image_path)
% %ext = image_path(split(lower(f)));
% %disp(f)
% %if f.endsWith([".jpg",".jpeg",".png", ".PNG"])
% % image_files.append(f);
% %end
% end
image_file_name = [];
if ~isempty(image_files)
for image_file = image_files
image_file_name.append(image_file);
image = imread(image_path + "/" + image_file);
[height, width] = size(image);
print(str(height) + " " + str(width))
[newcameramtx, roi] = getOptimalNewCameraMatrix(camera_matrix, dist, [width,height], 0, [width,height]);
% dst = cv2.undistort(image, camera_matrix, dist, None, newcameramtx)
[mapx, mapy] = cv.initUndistortRectifyMap(camera_matrix, dist, None, newcameramtx, [width,height], 5);
dst = cv.remap(image, mapx, mapy, INTER_LINEAR);
x, y, w, h = roi;
dst = dst(y:y+h, x:x+w);
[height, width] = size(dst);
print(str(height) + " " + str(width));
imwrite("undistortion/" + image_file, dst);
end
end
end

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Accepted Answer

Adam Danz
Adam Danz on 17 Aug 2021
Edited: Adam Danz on 17 Aug 2021
> I am trying to recursively search directories and build a list of paths to image files
Inputs:
% Define the main directory
image_path = 'C:\Users\name\Documents';
% list accepted extensions (with leading dot, case ignored)
acceptedExt = [".jpg",".jpeg",".png"];
Recursively search main directory (and sub directories) for files with listed extensions. fileList contains a cell array of full paths to matched files. The extension match ignores case.
d = dir(fullfile(image_path,'**\*.*'));
d([d.isdir]) = []; % remove directories from list
[~,ext] = regexp({d.name}','.*(\..*$)','match','once','tokens');
isAccepted = ismember(lower([ext{:}]), lower(acceptedExt));
d(~isAccepted) = []; % remove files that do not have accepted ext.
% list full paths to accepted files
fileList = fullfile({d.folder},{d.name})';
  2 Comments
Adam Danz
Adam Danz on 17 Aug 2021
Sure, to display the number of accepted files for each extension, replace the ismember line with the line below and add the second block of code to the end.
[isAccepted,extIdx] = ismember(lower([ext{:}]), lower(acceptedExt));
% Count number of matches for each acceptedExt
unqExtIdx = unique(extIdx(isAccepted));
count = histcounts(extIdx(isAccepted), 'BinMethod','integers');
disp(compose('%s: %.0f', acceptedExt', count'))
Example output:
ans =
4×1 cell array
{'.jpg: 388'}
{'.jpeg: 0' }
{'.png: 0' }
{'.gif: 1' }

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