MATLAB: Error in edge command

Question

Hello,

When I run the following code I get this message: ??? [BW,threshold]=edge(img,’zerocross’,[],'Laplacian'); | Error: The input character is not valid in MATLAB statements or expressions.

Could someone help me?

Thanks in advance

%%%%%% code%%%%%% clc;close all;clear *;

Laplacian=[1 1 1; 1 -8 1; 1 1 1];

img=double(imread('C:\Users\manolis\Desktop\ask4 sagkriwths\clown.tif')); [BW,threshold]=edge(img,’zerocross’,[],'Laplacian'); figure;imshow(img,[]) figure;imshow(BW)

disp(threshold)

Answer 1

You have the wrong kind of quotes around zerocross and should not have quotes around Laplacian. Try this:

[BW,threshold]=edge(img,'zerocross',[],Laplacian);