清空筛选条件
清空筛选条件

How to implement the following equations in image encryption

1 次查看（过去 30 天）
Renjith V Ravi
Renjith V Ravi 2016-12-29
评论： Hina Naz 2021-6-15
Upto finding D(i,j),I have found below
clear all
close all
clc
im1 = imread('lena.bmp');% Read the input image
im2 = im1;
im2(10,10) = 255; % im2 is the image with one pixel difference
[M N] = size(im1);
r = uint8(randi([0,256],h,w)); % Generate a random matrix for encryption
C1 = bitxor(im1,r); % Encryption-1
% imdec = bitxor(xored,r);
C2 = bitxor(im2,r); % Encryption-2
% find D(i,j)
for i=1:M
for j=1:N
if C1(i,j)== C2(i,j)
D(i,j) =0;
else
D(i,j) =1;
end
end
end
D = uint8(D); % change D to uint8 format
how to find the NPCR and UCAI as shown below

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2016-12-29
  2 个评论
Walter Roberson
Walter Roberson 2016-12-29
NPCR = mean(D(:)) * 100;
But watch out: your code expects the image to be grayscale, which might not be true for lena.bmp

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Programming 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by