Main Content

removeImages

Remove images from image index

collapse all in page

Syntax

removeImages(imageIndex,imageIds)

Description

removeImages(imageIndex,imageIds) removes the images from the imageIndex object that correspond to the imageIds input.

example

Examples

collapse all

Open Live Script

Create image set.

dataDir  = fullfile(toolboxdir('vision'),'visiondata','imageSets','cups');
imds = imageDatastore(dataDir);

Index the image set.

imageIndex = indexImages(imds)
Creating an inverted image index using Bag-Of-Features.
-------------------------------------------------------

Creating Bag-Of-Features.
-------------------------

* Selecting feature point locations using the Detector method.
* Extracting SURF features from the selected feature point locations.
** detectSURFFeatures is used to detect key points for feature extraction.

* Extracting features from 6 images...done. Extracted 1708 features.

* Keeping 80 percent of the strongest features from each category.

* Balancing the number of features across all image categories to improve clustering.
** Image category 1 has the least number of strongest features: 1366.
** Using the strongest 1366 features from each of the other image categories.

* Creating a 1366 word visual vocabulary.
* Number of levels: 1
* Branching factor: 1366
* Number of clustering steps: 1

* [Step 1/1] Clustering vocabulary level 1.
* Number of features          : 1366
* Number of clusters          : 1366
* Initializing cluster centers...100.00%.
* Clustering...completed 1/100 iterations (~0.04 seconds/iteration)...converged in 1 iterations.

* Finished creating Bag-Of-Features


Encoding images using Bag-Of-Features.
--------------------------------------

* Encoding 6 images...done.
Finished creating the image index.

imageIndex = 
  invertedImageIndex with properties:

         ImageLocation: {6x1 cell}
            ImageWords: [6x1 vision.internal.visualWords]
         WordFrequency: [0.1667 0.1667 0.1667 0.3333 0.1667 0.1667 0.1667 0.5000 0.3333 0.1667 0.3333 0.1667 0.1667 0.1667 0.1667 0.1667 0.1667 0.1667 0.1667 0.3333 0.1667 0.1667 0.1667 0.1667 0.1667 0.1667 0.1667 0.1667 0.1667 ... ] (1x1366 double)
         BagOfFeatures: [1x1 bagOfFeatures]
               ImageID: [1 2 3 4 5 6]
        MatchThreshold: 0.0100
    WordFrequencyRange: [0.0100 0.9000]


imageIndex.ImageLocation
ans = 6x1 cell
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/bigMug.jpg'    }
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/blueCup.jpg'   }
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/handMade.jpg'  }
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/holdingCup.jpg'}
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/plaid.jpg'     }
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/plainWhite.jpg'}

Remove first and third image.

removeImages(imageIndex,[1 3]);
imageIndex.ImageLocation
ans = 4x1 cell
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/blueCup.jpg'   }
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/holdingCup.jpg'}
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/plaid.jpg'     }
    {'/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/vision/visiondata/imageSets/cups/plainWhite.jpg'}

Input Arguments

collapse all

Image search index, specified as an invertedImageIndex object.

Image identifiers, specified as a vector of positive integers. The image identifiers correspond to the identifiers in imageIndex.ImageID, where ImageID is a property of the invertedImageIndex object.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Version History

Introduced in R2015a

See Also

| |