Getting Error for Marker and Mask ,Please give solution

function[g]=hueedge(f)
hsv=rgb2hsv(f);
I=hsv(:,:,3);
i=medfilt2(I);
sh=fspecial('sobel');
sv=sh;
Gx=conv2(double(i(:,:,1)),sh);
Gy=conv2(double(i(:,:,1)),sv);
Gxy=sqrt(Gx.^2+Gy.^2);
w=[1,1,1;1,-8,1;1,1,1];
Gxy2=conv2(double(i),w);
gr=Gxy-Gxy2;
s=histeq(gr);
%p=imshow(s);
 markerImage =false(size(w));
 marker(3,3)= true;
 q=imreconstruct(markerImage,w);
 w=ones(1);
 g=imsubtract(s,w);

Error using ==> imreconstructmex

Function imreconstruct expected MARKER and MASK to have the same class.

Error in ==> imreconstruct at 71

im = imreconstructmex(marker,mask);

Error in ==> hueedge at 17

 q=imreconstruct(markerImage,w);

[Poonam]

Now getting error

??? Error using ==> imreconstructmex

MARKER pixels must be <= MASK pixels.

Error in ==> imreconstruct at 71

im = imreconstructmex(marker,mask);

[Jan]

Please ask one question per thread and mark an answer as "accepted", when one problem is solved. Thanks.

Answer 1

[Jan]

The error message is clear, isn't it?

So either convert markerImage to the class of w, or the other way around:

markerImage = double(markerImage);

You define the variable markerImage and modify values in the undefined variable marker. Is this a typo?

Answer 2

[Günsu]

img = imread('img.png');
img=rgb2gray(img);
img= im2uint8(img);
imshow(img);

marker = false(size(img));
marker(33:38,17:55) = true;
marker = im2uint8(marker);
figure,imshow(marker);

im = imreconstruct(marker,img);
figure, imshow(im);

These errors are resolved by using im2uint8

Error using ==> imreconstructmex Function imreconstruct expected MARKER and MASK to have the same class.

Error using ==> imreconstructmex MARKER pixels must be <= MASK pixels.