how can I concatenate cropped images from a folder?
2 次查看(过去 30 天)
显示 更早的评论
Hi
I am a beginner in matlab, and I was assigned a project to crop a series of images in a folder and then combine the together.
I always get stuck because I don't know how to make the loop. so far I called the path of the folder. can you direct me to what kind of functions should I be using?
Thank You.
0 个评论
回答(2 个)
Ben11
2014-8-18
编辑:Ben11
2014-8-18
Here is a bit of code to get you going. It creates a dialog title to allow the user to select the folder containing tiff files (you can change to other extensions if you want) to crop, then store the images in a cell array and use a loop to actually crop the images using imcrop. For the example I'm assuming a grayscale image, but it can easily be modified.
clear all
clc
dialog_title = 'Select the directory containing the images to be processed';
folder_name = uigetdir('',dialog_title);
addpath(folder_name);
% select current folder
cd(folder_name);
ImagesToRead = dir('*.tif');
ImageCell = cell(1,length(ImagesToRead));
CroppedImageCell = cell(1,length(ImagesToRead));
for k = 1:length(ImagesToRead)
ImageCell{k} = imread(ImagesToRead(i).name); % Read image and store in cell array.
CroppedImageCell{k} = imcrop(ImageCell{k},CropRectangle); % See comments below
end
% Save to resulting images in a sequence or a stack:
% 1) Sequence:
SequenceName = 'DummyName' ; name of the sequence...change as you wish.
for k = 1:length(ImagesToRead)
ExportedName = sprintf('%s%d.tif',SequenceName,k); % Add the frame # after the name
imwrite(CroppedImageCell{k},ExportedName,'tif','WriteMode','overwrite','Compression','none');
end
% 2) Stack
SequenceName = 'DummyName' ; name of the sequence...change as you wish.
for k = 1:length(ImagesToRead)
imwrite(CroppedImageCell{k},SequenceName,'tif','WriteMode','append','Compression','none'); % Note the "append" writing mode.
end
In the above code, you will want to change "CropRectangle" to a rectangle with the size/position that best fits your need. Consult the link I provided above to know how to do so.
If it's not clear please ask for more details :)
4 个评论
Ben11
2014-10-15
Oh sorry I did not see your comment. @Thorsten's answer is the way to go. Glad it helped you!
Image Analyst
2014-10-15
Seems like a weird, unnecessary mixing of different string methods to me. I'd do it more simply like this:
filename = sprintf('dummyname%03d', i);
Image Analyst
2014-8-18
The images have to match up in the dimension they are to be stitched together in. You can try the montage() function.
You can also try this stitching app: http://www.mathworks.com/matlabcentral/fileexchange/25797-stitch which handles images of mismatched sizes.
0 个评论
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Image Processing Toolbox 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!