MATLAB: I had an fingerprint image, i want to make the fingerprint in the image white and the background black how to do that

image processing

I mean FingerPrint masking as mentioned in the image.

Best Answer

Using bwconvhull function, you can create fingerprint masking image. Here is an example.

% Read image
I = imread('1_1.jpg');
% Binarize
Igray = rgb2gray(I);
BW = imbinarize(Igray);
% Create mask
BWmask = bwconvhull(~BW);
% Show the result
imshowpair(I,BWmask,'montage')

Related Solutions

MATLAB: How to crop image after regionprops

Hi,

You can use imcrop to crop the image. The answer in the following link gives a detailed explanation on how to crop the image around the given centriod.

https://www.mathworks.com/matlabcentral/answers/355880-how-to-crop-square-of-size-100-x-100-around-the-centroid-of-an-image#answer_280921

Hope this helps!

MATLAB: Extraction of rectangular blob from binary image

How about comparing length around the blob and length around the bounding box of the blob, like:

% sample blogs
I = imread('pillsetc.png');
Iblob = rgb2gray(I) > 200;
% measure perimeter and bounding box for each blob
stats = regionprops(Iblob,{'BoundingBox','perimeter'});
stats = struct2table(stats);
% extract the blob whose perimeter is close to round length of its bounding box
stats.Ratio = 2*sum(stats.BoundingBox(:,3:4),2)./stats.Perimeter;
idx = abs(1 - stats.Ratio) < 0.1;
stats(~idx,:) = [];
% show the result
imshow(Iblob);
hold on
for kk = 1:height(stats)
  rectangle('Position', stats.BoundingBox(kk,:),...
      'LineWidth',    3,...
      'EdgeColor',    'g',...
      'LineStyle',    ':');
end

Best Answer

Related Solutions

MATLAB: How to crop image after regionprops

MATLAB: Extraction of rectangular blob from binary image

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