It is named after Irwin Sobel, who presented the idea of an "Isotropic 3x3 Image Gradient Operator" at a talk at the Stanford Artificial Intelligence Laboratory (SAIL) in 1968.
It is named after Irwin Sobel and Gary Feldman, colleagues at the Stanford Artificial Intelligence Laboratory (SAIL). Sobel presented the idea of an "Isotropic 3x3 Image Gradient Operator" at a talk at SAIL in 1968.