How to stack image files if they are of different size

2012 5 22
1 个回答
回答已采纳
66 次查看（30 天）

0 个投票

I am working with .tif images. they are of different sizes and there about 600 files.when i try to stack those images using 'for' loop, I am getting an error "Subscripted assignment dimension mismatch" because they do not agree with rows. column size is the same. I preallocate memory for the variable where the images should be stacked. still it is not happy. Please your help is much appreciated.

请先登录，再回答此问题。

 采纳的回答

Geoff
Geoff 2012-5-22

0 个投票

When you say 'stack', are you storing each image as a 'page' in some dimension? So you might have:
imageStack = nan( maxHeight, maxWidth, numColours, numImages );
Or are you stacking them vertically?
imageStack = nan( maxHeight * numImages, maxWidth, numColours );
In either case, what I'll suggest is that when you make your assignment, you need to subscript your image stack with a range that matches your image data (I'll use my first interpretation of image stack):
imageStack( 1:size(image,1), 1:size(image,2), 1:size(image,3), imno ) = image;
The same principle would apply in my second interpretation of imageStack, but your logic may be different depending on whether you allow slack space between images or you squeeze them together.

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Kavitha Srinivasan
Kavitha Srinivasan 2012-5-22
Thanks for your reply.
I really like to concatenate those images into 3D image, i.e, n_rows*n_col*n_files, so that I could possibly remove images from any direction. I mean extracting an image from a set either axially or coronally or whatever.
Geoff
Geoff 2012-5-22
Right, so that's my first interpretation, except it seems that you have monochrome images (ie you can remove the 3rd dimension that handles colour channels). I am assuming that when an image contains fewer rows, you align it along the top edge. If you wanted to align on the bottom edge or centre it, that's a trivial change to the code.
Just to be clear here, do this:
imageStack( 1:size(image,1), 1:size(image,2), imno ) = image;
Where 'image' is one image that you have read in your for-loop, and 'imno' is the loop iteration variable.
Kavitha Srinivasan
Kavitha Srinivasan 2012-5-22
Thank you so much.
It worked now.
I could stack them as 3D image. May i get clarify this as well.
I really want to make them read as binary file inorder to input that file for reconstruction using someother function.
Though I could read them as binary file through 'fread', when I try to use 'reshape', I got an error "elements should be the same when using reshape". what does it mean?
Kindly help me.

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Raster Data 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by