Abstract

Automatic processing of digital images of falling raindrops is complicated by a less than ideal grayscale image histogram. These his- tograms do not display a bimodal shape and lack an easily defined mini- mum, making it difficult to choose a threshold for creating a binary im- age. To help identify peaks in these histograms, and simplify threshold selection, a histogram modification technique originally developed by Peleg is used. This method was modified slightly and then applied to raindrop image processing. Its performance is quantified. © 2008 Society of

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