我想在matlab中对齐两个指纹图像，以便使用模糊库进行匹配。请帮助我。
% read two images
Im1 = imread('input_2.tif');
Im2 = imread('input_3.tif');
% convert images to type double (range from from 0 to 1 instead of from 0 to 255)
Im1 = im2double(Im1);
Im2 = im2double(Im2);
% Calculate the Normalized Histogram of Image 1 and Image 2
hn1 = imhist(Im1)./numel(Im1);
hn2 = imhist(Im2)./numel(Im2);
% Calculate the histogram error
f = sum((hn1 - hn2).^2);
f; %display the result to console
[i,j]=samplealign(hn1,hn2);