New multispectral edge detection methods based on roughness and differential Prewitt. - Jarkko Ansamäki; Pekka J. Toivanen; Jussi Parkkinen (EUSIPCO, 2000)

Edge detection in multispectral images using the self-organizing map. - Pekka J. Toivanen; Jarkko Ansamäki; Jussi Parkkinen; Jarno Mielikäinen (Pattern Recognit. Lett., 2003)