countEachLabel

Count files in ImageDatastore labels

Syntax

T = countEachLabel(imds)

Description

T = countEachLabel(imds) returns a summary table of the labels in imds and the number of files associated with each.

Examples

Label Count

Create an ImageDatastore object and label each image according to the folder it is in.

imds = imageDatastore(fullfile(matlabroot, 'toolbox', 'matlab', {'demos','imagesci'}),...
'LabelSource', 'foldernames', 'FileExtensions', {'.jpg', '.png', '.tif'})

imds = 

  ImageDatastore with properties:

      Files: {
             ' ...\matlab\toolbox\matlab\demos\cloudCombined.jpg';
             ' ...\matlab\toolbox\matlab\demos\example.tif';
             ' ...\matlab\toolbox\matlab\demos\landOcean.jpg'
              ... and 5 more
             }
     Labels: [demos; demos; demos ... and 5 more categorical]
    ReadFcn: @readDatastoreImage

List the file count for each label.

T = countEachLabel(imds)

T = 

     Label      Count
    ________    _____

    demos       6    
    imagesci    2    

Input Arguments

imds — Input datastore

ImageDatastore object

Input datastore, specified as an ImageDatastore object. To create an ImageDatastore from your image data, use the imageDatastore function.

Output Arguments

T — Table of label counts

two-column table

Table of label counts, returned as a two-column table containing the name of each label in imds and the number of files associated with each label.

Data Types: table

Extended Capabilities

Thread-Based Environment

Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.

This function fully supports thread-based environments. For more information, see Run MATLAB Functions in Thread-Based Environment.

Version History

Introduced in R2016a