how to display the minutia points on the fingerprint thinned image knowing the X and Y co-ordinates and the angle if each minutia?

Actually i have extracted the minutia points and it is stored in text file. i want to see them on the thinned image with different colors. Can anyone help me out?

Answer 1

[Image Analyst]

If minutiae is an N by 2 array of the minutiae coordinates, then try this:

imshow(yourImage)
hold on;
for k = 1 : size(minutiae)
  x = minutiae(k, 1); % Extract x coordinate
  y = minutiae(k, 2); % Extract y coordinate
  plot(x, y, 'b*', 'MarkerSize', 10);
end

[Vinay Kumar]

Its an N by 3 array (X Y and angle).

[Vinay Kumar]

Actually I have got the bifurcations and terminations separately along with their x,y co-ordinates and the orientation. So do i need to concatenate them to get the single matrix of all minutia points?

[Image Analyst]

No - there is nothing to concatenate. You already have the N by 3 array, like I assumed. I just don't know what you plan on doing with the angle. If you want you can get another x,y point and draw a line at that angle between them. Explain what that angle is to used for.

[Vinay Kumar]

In some paper, I have read that minutia points are indicated by x, y and its orientation(that gives the direction of the ridge flow). Sir, Can you tel me why the direction estimation of the fingerprint is needed(same as your que)? I have attached the m file for direction estimation

[Image Analyst]

I imagine the angle is for something like a ridge that just goes to an end. OK, fine. But what do you want to do with that? Like I said, if you have a point and an angle, you can determine a second endpoint if you specify a distance along that angle, then you can draw a little line. But I really don't have any idea what you want to do. Sounds like you don't either, so why don't you just ignore the angle then?

[Vinay Kumar]

ya ok sir, I will ignore them.. Can you guide me in further process of fingerprint recognition? It would be of great help from you..

[Image Analyst]

Sorry, but it's not my area of expertise.

[Vinay Kumar]

It's ok.. Thanks alot sir..

[zohre saeedi]

hello viny kumar . I am working on fingerprint. I want to calculate orientation of minutiae but I can't. can you send me your code? my email is [e-mail]