better edge enhancement how?

any suggestion how to enhace the image edges clearly?

I = imread('317.jpg');

% A = rgb2gray(I2);

figure;

imshow(I)

title('Original Image')

%%

%Gaussian LPF

F = fspecial('gaussian');

G = imfilter(I,F);

figure(5),imshow(G);title('G Image');

%%

bw = im2bw(G,0.35);

figure(4),imshow(bw)

kernel = -1*ones(1);

kernel(2,2) = 4;

enhancedImage = imfilter(bw, kernel);

figure(6),imshow(enhancedImage);title('enhancedImage Image');

D = im2uint8(enhancedImage);

I2 = imcrop(D,[50 68 130 112]);

figure;

imshow(I2)

r = drawrectangle;

mask = createMask(r);

bw2 = activecontour(I2,mask,30,'Chan-Vese');

hold on;

visboundaries(bw2,'Color','r');

figure

imshow(labeloverlay(I2,bw2));

imshow(bw2);