... ha.nmˇa.tna. 1 9 11 1 11 1 11 1.Ngo`ai ra, ta c´o thˆe˙’t´ınh d¯´ap ´u.ng cu˙’aa˙’nh v´o.i c´ac mˇa.tna.sau d¯ˆe˙’l`am tro.na˙’nh 1 10 11 1 12 1 11 1, 1 16 12 1242 12 1.C´ac ... hˆe.sˆo´kh´ac ˆam.Chˇa˙’ng ha.nx´etmˇa.tna.Laplace l`am n´et a˙’nh: 1 9× 1 1 1 18 1 1 1 1 .Ch´u´yrˇa`ng tˆo˙’ng c´ac hˆe.sˆo´bˇa`ng 0. Do d¯´o khi mˇa.tna.di ... cˆa.n cho tru.´o.ccu˙’a(x, y). N´oi c´ach kh´ac,g(x, y):= 1 S(n,m)∈N(x,y)f(n, m),v´o.i x =0, 1, ,M − 1, y =0, 1, ,N − 1, N(x, y) l`a lˆan cˆa.ncu˙’a(x, y)v`aS l`a sˆo´pixel trong...