Counting Objects in Images

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Using only a few lines of code, it is possible to count the number of objects in a image. It is important to do the image acquisition with a standard background.


There are some basic steps:

1. Original image. 2. Apply a Gaussian filter to reduce image noise. 3. Binarize to get only a black-and-white binary image. 4. Count the number of elements (white spots) with Mathematica's built-in function ComponentMeasurements, which returns a list with the center of each cluster. 5. Original image with objects counted.

Use the tabs to see the intermediate steps; to see the steps, hover over the images.


Contributed by: Daniel de Souza Carvalho (November 2015)
Open content licensed under CC BY-NC-SA



The images were captured with a USB camera connected to a Raspberry Pi computer.

This code was presented previously at two events: Embedded System Conference (ESC) 2014, São Paulo, Brazil Semana FCI 2015, Mackenzie University, São Paulo, Brazil

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