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Learn OpenCV 4 by Building Projects - Second Edition by Prateek Joshi, Vinicius G. Mendonca, David Millan Escriva

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Thresholding

After removing the background, we only have to binarize the image for future segmentation. We are going to do this with threshold. Threshold is a simple function that sets each pixel's values to a maximum value (255, for example). If the pixel's value is greater than the threshold value or if the pixel's value is lower than the threshold value, it will be set to a minimum (0):

Now, we are going to apply the threshold function using two different threshold values: we will use a 30 threshold value when we remove the light/background because all non-interesting regions are black. This is because we apply background removal. We will ...

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