Digital Step Edges from Zero Crossings of Second Directional Derivatives. Haralick, R M IEEE Transactions on Pattern Analysis and Machine Intelligence, 6:58–68, 1984.
bibtex   
@article{haralick_digital_1984,
	title = {Digital {Step} {Edges} from {Zero} {Crossings} of {Second} {Directional} {Derivatives}.},
	volume = {6},
	journal = {IEEE Transactions on Pattern Analysis and Machine Intelligence},
	author = {Haralick, R M},
	year = {1984},
	pages = {58--68},
}

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