I give you code generate edge detection an image processing using robert algorithm which based on kernel matrix. it is not used matlab toolbox but handmade. so feel free to use it.

DETEKSI TEPI DENGAN ROBERT\ALGORITMA ROBERT dan PREWITT UNTUK DETEKSI TEPI OBJEK PADA CITRA DIGITAL.pdf
..........................\ALGORITMA ROBERT.docx
..........................\citra asli berderau.jpg
..........................\citra gradient.jpg
..........................\DeteksiTepiDenganRobert.m
..........................\robert.jpg
..........................\sepatuku.jpg
..........................\toolbox.jpg
DETEKSI TEPI DENGAN ROBERT

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