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user 824
In signal processing, a filter is a device or process that transforms a signal by selectively choosing specific frequencies and leaving others with appropriate gain or as it is.
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How to outline a defect in an image?
As far as I understand what you call defects are detcted by changes in color of the fruit.
I would proceed as follow:
edge detection algorithm, (as you did), to detect the fruit region in the image …
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