Legacy ImageMagick Discussions Archive

Is there a special command to get areas of interest (e. g. by finding clusters of high contrast) in ImageMagick?
I imagine a command like this
where -interest is the maximum number of areas with the highest interest to be found, the output would be a crop geometry.

We can readily find the contrast, eg with "-statistic StandardDeviation". I show some other methods at Details, details. This can give us an image that is black-gray-white: light where the contrast is high, and dark where the contrast is low.

Finding clusters is less simple, and less well defined. For example, a group of 100 light pixels distant from another similar group is two clusters, but they might virtually merge, and we might want to call that one cluster.

Methods shown on K-clustering may be useful, to partition the black-gray-white image. Or we could threshold the black-gray-white image and use connected-components.

Yes, this is what I tested some hours ago:
Your post is very helpful to find a performant solution, thank you for sharing!

Andi34 wrote: ↑2018-10-28T12:35:45-07:00

Code: Select all

convert ... -colorspace Gray -auto-gamma -sharpen 2x1 -statistic StandardDeviation

I've tried this but I'm getting: Why would StandardDeviation not be found as an option?

What is your complete command?

You have three dots where IM expects an input image.

You have no output image.

You have a type but no geometry for "-statistic". See http://www.imagemagick.org/script/comma ... #statistic

To complete my command - example:
It's useful to append -contrast-stretch 0x0 or -normalize after -statistic ..., else the highest luminance will be very low for smaller geometries.

You need to specify a region size (geometry) after -statistic StandardDeviation, such as 3x3. See https://imagemagick.org/script/command- ... #statistic