Chaudhuri, B BChanda, Bhabatosh2011-02-092011-02-091984Signal Processing, V6, IS:2, P143-151http://hdl.handle.net/10263/1220enImage processingEdge detection4-neighbor gradientThe equivalence of best plane fit gradient with Robert's Prewitt's and Sobel's gradient for edge detection and a 4-neighbour gradient with useful propertiesArticle