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

DETEKSI TEPI DENGAN SOBEL\ALGORITMA SOBEL UNTUK DETEKSI KARAKTER.pdf
.........................\ALGORITMA SOBEL.docx
.........................\car3.jpg
.........................\citraasli.jpg
.........................\DeteksiObjekdgnSobel.m
.........................\jogja.jpg
.........................\sobel1.jpg
.........................\sobel2.jpg
DETEKSI TEPI DENGAN SOBEL

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