Please help me with image processing.

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Shirly S
Shirly S 2016-9-8
评论： Image Analyst 2016-11-25
I need to find a tinny curved line in an image. I tried all of this but I cant find anything. Do I need a fancy function to make it work? I'll appreciate any of your comments. Thank you so much!!
TRIAL1
%constrast streching
x=input('enter the factor which contrast should be increased');
a=imread('Test 7 single bb.tif');
[m,n]=size(a);
for i=1;1:m
for j =1:1:n
b(i,j)= a(i,j)*x;
end
end
subplot(1,2,1),subimage(a),title('original image')
subplot(1,2,2),subimage(b),title('contrast image')
%for some reason this one is not working.
TRIAL2
%Power law transformation
f = imread ('Test 7 single bb.tif');
f = im2double (f);
[m n]=size (f);c = 1;
%small number =brighter image
gama = input('gamavalue = ');
for i=1:m
for j=1:n
g(i,j)=c*(f(i,j)^gama);
end
end;
imshow(f),figure, imshow(g);
TRIAL3
%log transformation
f=imread('Test 7 single bb.tif');
% you can change 0.02 for any number, small number gives you brigther images
g=im2uint8 (mat2gray (log (0.02+double (f))));
imshow(f), figure, imshow(g)
TRIAL4
%negative transformation
f=imread('Test 7 single bb.tif');
g = imcomplement(f);
imshow(f), figure, imshow(g)

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