How to count the number of eggshells in the image

Question

My goal for this is to simply count the number of eggshells in the image.

eggshells

Using color negate only leads to this

shell = Import["https://i.stack.imgur.com/xJLJX.jpg"];
binshell = FillingTransform[ColorNegate[Binarize[shell]]]

negate

With luck, I at least came up with something clearer using

binshell = LocalAdaptiveBinarize[shell, 25];

binarize

What is the best way to count the total number of eggshells?

Are these photos always white on a green background? That would help separating items a lot. — kirma, Apr 28, 2018 at 18:14
Tried ColorQuantize. Using colornegate after only makes the whole image white. I however tried detecting all the white stuff using this as guide link but this is merely the result link — visatete, Apr 28, 2018 at 18:36
Very ad hoc, with too much magic: Import["https://i.imgur.com/PZNt7JQ.jpg"] // ColorSeparate[#, "S"] & // Binarize[#, 0.25] & // ColorNegate // Dilation[#, 5] & // MorphologicalComponents // Max (* 11 *) — kirma, Apr 28, 2018 at 18:54

bill s · Accepted Answer · 2018-04-28 19:41:25Z

10

Here's one way:

{r, g, b} = ColorSeparate[Import["https://i.imgur.com/PZNt7JQ.jpg"]];
bw = MorphologicalBinarize[b, 0.5]

ComponentMeasurements[bw, #Count > 200 &] // Length
11

answered Apr 28, 2018 at 19:41

bill s

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2

$\begingroup$ Or Max@MorphologicalComponents@SelectComponents[bw, "Area", # > 200 &] in pre-v11. $\endgroup$
– corey979
Apr 28, 2018 at 19:58

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