image-processing - 向矢量添加噪声

Question

我有一个带有 float 的向量，例如:

Vect = [15.123, 21.345, 35.567, 45.362];

我需要的是仅对小数点后的数字应用高斯噪声。例如，取向量 [123, 345, 567, 362]，然后对其应用噪声。因此，替换Vect中的噪声向量。

我知道要添加高斯噪声，可以按如下方式执行:

noisy_vector = imnoise(Vect, 'gaussian');

但我有兴趣仅将噪声添加到 Vect 中小数点后的数字(自动)以获得噪声 Vect。

非常感谢任何帮助!

Answer 1

代码

%// Input
Vect = [15.123, 21.345, 35.567, 45.362]

%// Extract the decimal parts from the vector elements
decimal_part = Vect - floor(Vect)

%// Add gaussian noise to it with zero mean and 0.01 variance using imnoise
noisy_decimal_part = imnoise(decimal_part, 'gaussian',0,0.01)

%// Put the noisy part back to Vect to get the desired output
noisy_Vect =  noisy_decimal_part + floor(Vect)

代码运行时的输出

Vect =
   15.1230   21.3450   35.5670   45.3620
decimal_part =
    0.1230    0.3450    0.5670    0.3620
noisy_decimal_part =
    0.2254    0.3554    0.4914    0.2918
noisy_Vect =
   15.2254   21.3554   35.4914   45.2918