i am doing my project n fingerprint pore modeling.

am doing anisotropic pore model.for that i need to calculate ridge orientation and ridge frequency estimation.ridge frequency is calculating usind projection based mathod.can someone help me to write code for ridge frquency estimation

Answer 1

[Sean de Wolski]

We can help you write the code if you can show us what you've done/tried so far, why it does/does not work, what you provide./[expect want] etc.

No we will not write the code for you from a vague description of a homework problem and no effort/attempt provided. "Please" goes a long way as well.

[reshma ravi]

A = imread('D:\reshma_pg\down.jpg');

A=rgb2gray(A)

B=A;

imshow(A)

figure

sz=size(A)

for x=1:sz(1)-2

for y=1:sz(2)-2

Sa(1,1)=A(x,y);

Sa(1,2)=A(x,y+1);

Sa(1,3)=A(x,y+2);

Sa(2,1)=A(x+1,y);

Sa(2,2)=A(x+1,y+1);

Sa(2,3)=A(x+1,y+2);

Sa(3,1)=A(x+2,y);

Sa(3,2)=A(x+2,y+1);

Sa(3,3)=A(x+2,y+2);

B(x+1,y+1)=abs((Sa(3,1)+2*Sa(3,2)+Sa(3,3))-(Sa(1,1)+2*Sa(1,2)+Sa(1,3)))+abs((Sa(1,3)+2*Sa(2,3)+Sa(3,3))-(Sa(1,1)+2*Sa(2,1)+Sa(3,1)));

end

end

imshow(B)

in my work i am taking fingerprint image as my input.first step in is to partition the fingerprint image in to number of blocks.that means well defined block,illposed block,background block.for that i need to calculate "structure tensor".then orientation consistency,and intensity contrast.i have calculated the first derivative

[reshma ravi]

A = imread('D:\reshma_pg\down.jpg');

A=rgb2gray(A)

B=A;

imshow(A)

figure

sz=size(A)

for x=1:sz(1)-2

for y=1:sz(2)-2

Sa(1,1)=A(x,y);

Sa(1,2)=A(x,y+1);

Sa(1,3)=A(x,y+2);

Sa(2,1)=A(x+1,y);

Sa(2,2)=A(x+1,y+1);

Sa(2,3)=A(x+1,y+2);

Sa(3,1)=A(x+2,y);

Sa(3,2)=A(x+2,y+1);

Sa(3,3)=A(x+2,y+2);

B(x+1,y+1)=abs((Sa(3,1)+2*Sa(3,2)+Sa(3,3))-(Sa(1,1)+2*Sa(1,2)+Sa(1,3)))+abs((Sa(1,3)+2*Sa(2,3)+Sa(3,3))-(Sa(1,1)+2*Sa(2,1)+Sa(3,1)));

end

end

imshow(B)

in my work i am taking fingerprint image as my input.first step in is to partition the fingerprint image in to number of blocks.that means well defined block,illposed block,background block.for that i need to calculate "structure tensor".then orientation consistency,and intensity contrast.i have calculated the first derivative for 3*3 matrix.STUCTURE TENSOR

j= 1/NB ??Bi?Bi^T

=[J11 J12

J21 J22 ].

ORIENTATION CONSISTENCY IS (J11-J22)^2+4J12^2/(J11+J22)^2....for this i need help from you to write the code