数字图像处理实验(8):PROJECT 04-04,Highpass Filtering Using a Lowpass Image
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实验要求:
高通滤波器可以通过1减去低通滤波器的传递函数得到。
使用公式 计算可以的得到 。
实验代码:
% PROJECT 04-04 Highpass Filtering Using a Lowpass Imageclose all;clc;clear all;%img = imread('Fig4.11(a).jpg');img = mat2gray(img);figure;subplot(2,2,1);imshow(img);title('原图像');% 产生滤波函数[M, N] = size(img);P = 2 * M;Q = 2 * N;alf = 50;H = zeros(P, Q);for i = 1:P for j = 1:Q H(i, j) = exp(-((i-P/2)^2 + (j-Q/2)^2) / (2 * alf^2)); endend% H = ones(P, Q);subplot(2,2,2);imshow(H);title('滤波函数');%% 图像填充[M, N] = size(img);P = 2 * M;Q = 2 * N;img_fp = zeros(P, Q);img_fp(1:M, 1:N) = img(1:M, 1:N);% [X, Y] = meshgrid(1:P, 1:Q);% ones = (-1)^(X+Y);% img_f = ones .* img_fp;img_f = zeros(P, Q);for x = 1:P for y = 1:Q img_f(x, y) = img_fp(x, y) .* (-1)^(x+y); endendimg_F = fft2(img_f);img_G = img_F .* H;img_g = real(ifft2(img_G));% img_g = ones .* img_g;for x = 1:P for y = 1:Q img_g(x, y) = img_g(x, y) .* (-1)^(x+y); endendimg_o = img_g(1:M, 1:N);subplot(2,2,3);imshow(img_o, []);title('高斯低通滤波后的图像');%img_gmask = img_o - img;subplot(2,2,4);imshow(img_gmask, []);title('高斯高通滤波后的图像');
前面的代码与此前的实验相同,下面是最后的高通滤波处理。img_o 是前面得到的高斯低通滤波处理后的图像,使用原图像减去它,得到的就是高斯高通滤波后的图像了。
img_gmask = img_o - img;subplot(2,2,4);imshow(img_gmask, []);title('高斯高通滤波后的图像');
实验结果:
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