imtile

Combine multiple image frames into one rectangular tiled image

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Syntax

out = imtile(filenames)
out = imtile(I)
out = imtile(images)
out = imtile(imds)
out = imtile(X,map)
out = imtile(___,Name,Value)

Description

out = imtile(filenames) returns a tiled image containing the images specified in filenames. filenames is an n-by-1 or 1-by-n string array, character vector, or cell array of character vectors. If the files are not in the current folder or in a folder on the MATLAB® path, specify the full path name. See the imread command for more information.

By default, imtile arranges the images so that they roughly form a square, but you can change that using optional parameters. The images can have different sizes and types.

  • If you specify an indexed image, then imtile converts it to RGB using the colormap present in the file.

  • If there is a data type mismatch between images, then imtile rescales all images to be double using the im2double function.

out = imtile(I) returns a tiled image containing all the frames of the multiframe image array I. A multiframe image array can be a sequence of binary, grayscale, or truecolor images.

out = imtile(images) returns a tiled image containing the images specified in the cell array images. imtile displays empty cell array elements as a blank tile.

out = imtile(imds) returns a tiled image containing the images specified in the ImageDatastore object imds. For information about image datastores, see ImageDatastore.

out = imtile(X,map) treats all grayscale images in X as indexed images and applies the specified colormap map to all frames. X can be an array of grayscale images (m-by-n-by-1-by-k), a string array of file names, or a cell array of character vectors. If X represents file names, map overrides any internal colormap present in the image files.

out = imtile(___,Name,Value) returns a customized tiled image, depending on the values of the optional parameter name-value pairs. You can abbreviate parameter names, and case does not matter.

Examples

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Open Live Script

Read multiple images from files into the workspace and create a tiled image containing the images. Display the tiled image.

out = imtile({'peppers.png', 'ngc6543a.jpg'});
imshow(out);

Open Live Script

Using a data set containing multiple images, tile the images in a grid.

Load the MRI data set.

load mri
out = imtile(D, map);
imshow(out);

Create a tiled image containing only the first eight images in the data set. Use the 'GridSize' parameter to arrange the images in a 2-by-4 grid. 

out = imtile(D, map, 'Frames', 1:8, 'GridSize', [2 4]);
figure;
imshow(out);

Open Live Script

Read an RGB image into the workspace.

imRGB = imread('peppers.png');

Create a tiled image containing each of the three planes of the RGB image. Display the tiled image.

out = imtile(imRGB);
imshow(out)

Open Live Script

From an image datastore, create and customize a tiled image.

Create an image datastore containing all the files with the file extension 'tif' or 'png' in the specified folder.

fileFolder = fullfile(matlabroot,'toolbox','matlab','imagesci');
imds = imageDatastore(fileFolder,'FileExtensions',{'.tif','.png'});

Create a tiled image containing the images in the datastore.

out1 = imtile(imds);
imshow(out1);

Use the 'BorderSize' and 'BackgroundColor' parameters to add a blue border to the tiled image.

out2 = imtile(imds, 'BorderSize', 10, 'BackgroundColor', 'b');
figure;
imshow(out2);

Input Arguments

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Names of files containing images, specified as an n-by-1 or 1-by-n string array, character vector, or cell array of character vectors.

Multiframe image, specified as a sequence of binary, grayscale, or truecolor images. I can be an m-by-n-by-k or an m-by-n-by-1-by-k array, or a sequence of binary, grayscale, or truecolor images. A binary or grayscale image sequence must be an m-by-n-by-k or an m-by-n-by-1-by-k array. A truecolor image sequence must be an m-by-n-by-3-by-k array.

List of images, specified as an n-by-1 or 1-by-n cell array of numeric matrices. The cell array can contain numeric matrices of size m-by-n or m-by-n-by-3.

Image data store, specified as an ImageDatastore object.

Indexed image and associated colormap, specified as a 2-D numeric array (image) and an n-by-3 numeric array of class double (colormap). n is the number of colors in the colormap.

Name-Value Pair Arguments

Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside quotes. You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.

Example: tiled_image = imtile({'peppers.png', 'ngc6543a.jpg'},'BackgroundColor','g');

Color of the background, specified as the comma-separated pair consisting of 'BackgroundColor' and MATLAB ColorSpec (Color Specification). The imtile function fills all blank spaces with this color, including the space specified by BorderSize. If you specify a background color, the imtile function renders the output as an RGB image.

Example: 'green'

Example: 'g'

Example: [0 1 0]

Padding around each thumbnail image, specified as the comma-separated pair consisting of 'BorderSize' and a numeric scalar or 1-by-2 vector of the form [brows bcols]. imtile pads the borders with the background color.

Frames to include, specified as the comma-separated pair consisting of 'Frames' and a numeric array or a logical mask. The imtile function interprets the values as indices into the image array or cell array. The following examples create a tiled image containing the first three image frames.

Example: out = imtile(I,'Frames',1:3);

Example: out = imtile(I,'Frames',[true true true]);

Number of rows and columns of thumbnails in tiled image, specified as the comma-separated pair consisting of 'GridSize' and a two-element vector of the form [nrows ncols]. nrows specifies the number of rows in the grid and ncols specifies the number of columns in the grid. Use NaNs or Infs to have imtile calculate the size in a particular dimension in a way that includes all the images.

  • If 'GridSize' is [2 NaN], then imtile creates a tiled image with two rows and the number of columns necessary to include all the images.

  • If both the elements are NaN or Inf, then imtile calculates the grid size to form a square. imtile returns the images horizontally across columns.

  • If there is a mismatch between GridSize and number of images (frames), imtile creates the tiled image based on GridSize.

Size of thumbnails, specified as the comma-separated pair consisting of 'ThumbnailSize' and a two-element vector of the form [trows tcols], in pixels. The imtile function preserves the aspect ratio of the original image by zero-padding the boundary.

  • If you specify a NaN or Inf, then the imtile function calculates the corresponding value automatically to preserve the aspect ratio of the first image.

  • If you specify an empty array ([]), then the imtile function uses the full size of the first image as the thumbnail size.

Output Arguments

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Tiled output image, returned as a numeric array.

See Also

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Introduced in R2018b

MATLAB Documentation

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