MOSSE源码中window2函数解析

本文链接： https://blog.csdn.net/qq_36880027/article/details/102709021

相关滤波跟踪算法鼻祖MOSEE的源代码中有一个函数window2()

% This function creates a 2 dimentional window for a sample image, it takes
% the dimension of the window and applies the 1D window function
% This is does NOT using a rotational symmetric method to generate a 2 window
%
% Disi A ---- May,16, 2013
%     [N,M]=size(imgage);
% ---------------------------------------------------------------------
%     w_type is defined by the following 
%     @bartlett       - Bartlett window.
%     @barthannwin    - Modified Bartlett-Hanning window. 
%     @blackman       - Blackman window.
%     @blackmanharris - Minimum 4-term Blackman-Harris window.
%     @bohmanwin      - Bohman window.
%     @chebwin        - Chebyshev window.
%     @flattopwin     - Flat Top window.
%     @gausswin       - Gaussian window.
%     @hamming        - Hamming window.
%     @hann           - Hann window.
%     @kaiser         - Kaiser window.
%     @nuttallwin     - Nuttall defined minimum 4-term Blackman-Harris window.
%     @parzenwin      - Parzen (de la Valle-Poussin) window.
%     @rectwin        - Rectangular window.
%     @taylorwin      - Taylor window.
%     @tukeywin       - Tukey window.
%     @triang         - Triangular window.
%
%   Example: 
%   To compute windowed 2D fFT
%   [r,c]=size(img);
%   w=window2(r,c,@hamming);
%   fft2(img.*w);

function w=window2(N,M,w_func)

wc=window(w_func,N);
wr=window(w_func,M);
[maskr,maskc]=meshgrid(wr,wc);

%maskc=repmat(wc,1,M); Old version
%maskr=repmat(wr',N,1);

w=maskr.*maskc;

end

函数作用：This function creates a 2 dimentional window for a sample image, it takes the dimension of the window and applies the 1D window function. This is does NOT using a rotational symmetric method to generate a 2 window

翻译成中文就是：这个函数为采样图像生成一个2维的窗，它获取窗的维度，同时使用了1维窗函数。该函数并不是使用旋转对称的方法生成2维窗。

使用示例：

% Example:
% To compute windowed 2D fFT
% [r,c]=size(img);
% w=window2(r,c,@hamming);
% fft2(img.*w);

具体来看函数的具体实现部分：

function w=window2(N,M,w_func)

wc=window(w_func,N);
wr=window(w_func,M);
[maskr,maskc]=meshgrid(wr,wc);

%maskc=repmat(wc,1,M); Old version
%maskr=repmat(wr',N,1);

w=maskr.*maskc;

end

分析：

以N和M为分辨率，调用两个1维的窗函数，得到一个二维的窗函数。

命令行窗口输入以下命令即可生成
>> w = window2(100,100,@hann);
>> mesh(w)

MOSSE源码中window2函数解析

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