How should I understand this code
조회 수: 3 (최근 30일)
이전 댓글 표시
Hello,
I have a code segment of generating gaussian noise, but I don't understand why it does so.
p=1+rand(1)*99; Gaussian_noise=rand(n,m)*(p-50);
rand(1) generates a 1-by-1 matrix from uniform distribution [0 1], right? but why it multiply a 99? And then it generate a matrix as the same size of an image I(n,m) And then subtract 50 and multiply again
Thanks.
댓글 수: 0
채택된 답변
Wayne King
2013년 6월 14일
This does not look like it produces white Gaussian noise. For example:
n = 1000;
m = 1;
p=1+rand(1)*99; Gaussian_noise=rand(n,m)*(p-50);
hist(Gaussian_noise)
figure;
qqplot(Gaussian_noise)
Just use randn()
If you want a matrix of Gaussian white noise
X = randn(256,256);
That is zero mean, variance 1. Add a constant and scale to obtain a different mean and variance.
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Detection에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!