I am applying region growing on edge detected image,but not getting output,Is the code right

function[g]=hueedge(f)
hsv=rgb2hsv(f);
H=hsv(:,:,1);
sh=fspecial('sobel');
sv=sh;
Gx=conv2(double(H(:,:,1)),sh);
Gy=conv2(double(H(:,:,1)),sv);
Gxy=sqrt(Gx.^2+Gy.^2);
w=[1,1,1;1,-8,1;1,1,1];
 Gxy2=conv2(double(H),w);
 g=Gxy-Gxy2;
 %s=histeq(h);
%markerImage =imsubtract(s,2);
%g = imreconstruct(markerImage,h);
%w=ones(1);
%g=imsubtract(s,w);

   This is my code edge detection on hsv image,now i have done REGION GROWING on this edge detected image, BUT NOT GETTING THE OUTPUT

here is the code for Region Growing on edge detected image

function pg=regiong(hsv)
h=hsv(:,:,1);
s=hsv(:,:,2);
v=hsv(:,:,3);
for i=1:size(hsv)
    for j=1:size(hsv)
        dh=h(x+i,y+j,1)-h(x,y,1).^2;
                ds=s(x+i,y+j,1)-h(x,y,2).^2;
                        dv=v(x+i,y+j,1)-h(x,y,3).^2;
    end
end
dist=sqrt(dh+ds+dv);
r=size(hsv);
c=size(hsv);
seed=[r./2,c./2];
rcount=1;
i=1;
j=1;
pg(i)=seed;
cases=input('choice');
    switch cases
        case 1
while pg(i)~=0
    cp=pg(i);
    i=i-1;
    for k=1:8
        if cp(k)~=0
            dist=dist(seed,cp(k));
            if(dist<thr)
                cp(k)=rcount;
                i=i+1;
                pg(i)=cp(k);
            else
                j=j+1;
                bp(j)=cp(k);
            end
        end
    end
end
        case 2

while bp~=0
    seed=bp(j);
    j=j-1;
    rcount=rcount+1;
    i=1;
    pg(i)=seed;
end
        case 1;      
    end

Is this code right, am I doing some mistake ,please give some specific answer with explaination