利用Perlin nosie 完成（PS 滤镜—— 分成云彩）

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%%%% Cloud%%%% 利用perlin noise生成云彩clc;clear all;close all;addpath('E:\PhotoShop Algortihm\Image Processing\PS Algorithm');Image=imread('4.jpg');Image=double(Image);[row,col,layer]=size(Image);baseNoise=rand(row,col);persistance = 0.9;totalAmplitude = 0.0;octaveCount=10;Cloud_texture=zeros(row,col);for i=0:octaveCount    amplitude=persistance.^(octaveCount-i);    % amplitude=persistance.^i;    totalAmplitude=totalAmplitude+amplitude;    Cloud_texture=Cloud_texture+Generate_smoothnoise(baseNoise, i)*amplitude;endCloud_texture=Cloud_texture/totalAmplitude;imshow(Cloud_texture);   function SmoothNoise=Generate_smoothnoise(baseNoise, octave)SmoothNoise=baseNoise;[row, col]=size(baseNoise);samplePeriod=2.^octave;sampleFrequency=1/samplePeriod;for i=1:row    sample_i0=floor((i/samplePeriod))*samplePeriod;    sample_i1=mod(sample_i0+samplePeriod,row);    vertical_blend = (i - sample_i0) * sampleFrequency;    for j=1:col        sample_j0 = floor(j / samplePeriod) * samplePeriod;        sample_j1 = mod(sample_j0 + samplePeriod,col);        horizontal_blend = (j - sample_j0) * sampleFrequency;                if(sample_i0<1)            sample_i0=1;        end                if(sample_i1<1)            sample_i1=1;        end                if(sample_j1<1)            sample_j1=1;        end                if(sample_j0<1)            sample_j0=1;        end                % blend the top two corners        top = Cosine_Interpolate(baseNoise(sample_i0,sample_j0),...        baseNoise(sample_i0,sample_j1), horizontal_blend);         % blend the bottom two corners        bottom = Cosine_Interpolate(baseNoise(sample_i1,sample_j0),...        baseNoise(sample_i1,sample_j1), horizontal_blend);         % final blend        SmoothNoise(i,j) = Cosine_Interpolate(top, bottom, vertical_blend);    endendfunction  y=Cosine_Interpolate(x1,x2,alpha)ft = alpha * 3.1415927;f = (1 - cos(ft)) * .5;y=x1*(1-f)+x2*f;
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