countObjects
R2026bSyntax
Description
Add-On Required: This feature requires the Visual Inspection Toolbox Model for CounTR Object Counting add-on.
count = countObjects(___,Name=Value)MiniBatchSize=4
specifies the mini-batch size as 4.
Examples
Load an exemplar image that contains objects to count, cell nuclei, into the workspace. The exemplar image and the test image in this example are cropped from an image of lymph node cells (patient_000_node_1.tif) in the CAMELYON-17 data set.
exemplarI = imread("nuclei.png");Define exemplar bounding boxes, which signify the locations of sample cells to count.
exemplarBoxes = ...
[272 23 38 30
302 193 30 24
66 83 30 28
108 243 38 32
168 61 30 30];Display the exemplar image together and the exemplar bounding boxes using the insertShape function.
annotatedImage = insertShape(exemplarI,"rectangle",exemplarBoxes,"LineWidth",4); imshow(annotatedImage)
Create CounTR Model
Create a CounTR object counter model using the exemplar image and exemplar bounding boxes.
counter = counTRObjectCounter(exemplarI,exemplarBoxes);
Count Objects in Test Image
Load a test image containing more cell nuclei into the workspace.
I = imread("nucleiTest.png");Display the test timage in which to count objects.
imshow(I)
Compute the number of objects in the test image using the countObjects object function.
count = countObjects(counter,I); count
count = single
496
Create Density Map of Object Count
Compute the density map of the object count in the test image using the densityMap object function.
densMap = densityMap(counter,I);
Display the object count density map overlaid over the test image using the anomalyMapOverlay function. Display the approximate object count on the overlaid image using the insertText function.
densityOverlayImage = anomalyMapOverlay(I,densMap,"Blend","equal"); fontSize = min(floor(size(densityOverlayImage,2)/30),200); gutterWidth = fontSize*9; densityOverlayImageWText = insertText(densityOverlayImage,[size(densityOverlayImage,2)-gutterWidth 5],... sprintf("count=%0.2f",count),FontSize=fontSize); imshow(densityOverlayImageWText)
