From 3de1f2611036dc0faebe7c45f6b68332f4dd3148 Mon Sep 17 00:00:00 2001
From: avinal <185067@nith.ac.in>
Date: Thu, 11 Feb 2021 23:52:15 +0530
Subject: [PATCH] high pass filter added

---
 digital_image_processing/lab/lab2/highpass.m | 33 ++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 digital_image_processing/lab/lab2/highpass.m

diff --git a/digital_image_processing/lab/lab2/highpass.m b/digital_image_processing/lab/lab2/highpass.m
new file mode 100644
index 0000000..6dcbb3c
--- /dev/null
+++ b/digital_image_processing/lab/lab2/highpass.m
@@ -0,0 +1,33 @@
+input_image = imread('download.jfif'); 
+image = rgb2gray(input_image);
+[M, N] = size(image); 
+ 
+FT_img = fft2(double(image)); 
+
+D0 = 5;  
+
+ 
+u = 0:(M-1); 
+idx = find(u>M/2); 
+u(idx) = u(idx)-M; 
+v = 0:(N-1); 
+idy = find(v>N/2); 
+v(idy) = v(idy)-N; 
+
+ 
+[V, U] = meshgrid(v, u); 
+
+
+D = sqrt(U.^2+V.^2); 
+
+ 
+H = double(D > D0); 
+
+
+G = H.*FT_img; 
+
+output_image = real(ifft2(double(G))); 
+
+
+subplot(2, 1, 1), imshow(image), 
+subplot(2, 1, 2), imshow(output_image, [ ]);