PS 滤镜— — sparkle 效果

    clc;    clear all;    close all;    addpath('E:\PhotoShop Algortihm\Image Processing\PS Algorithm');    I=imread('4.jpg');    Image=double(I)/255;    [height, width, depth]=size(Image);    rays = 25;    radius = 25;       amount = 25;     % 1-100    color = [1.0, 1.0, 1.0];   % 0-1    randomness = 25;    centreX=width/2.0;    centreY=height/2.0;    % % seed = 371;    rayLengths=radius+randomness / 100.0 * radius * rand(1,rays);    Img_new=Image;    for ii=1:height        for jj=1:width            dx = jj-centreX;            dy = ii-centreY;            distance=sqrt(dx*dx+dy*dy);            angle = atan2(dy, dx);            d = (angle+pi) / (2*pi) * rays;            f=d-floor(d);            len_1=rayLengths(mod(floor(d), rays)+1);            len_2=rayLengths(mod(floor(d)+1, rays)+1);            length = lerp(f, len_1,  len_2);            g = length*length / (distance+0.0001);            g = g.^((100-amount) / 50.0);            f =f - 0.5;    % %         f = 1-f*f;            f =f * cos(g);    % %         f =f * sin(g);            f=min(max(0,f),1);            r=Image(ii, jj, 1);            g=Image(ii, jj, 2);            b=Image(ii, jj, 3);            Img_new(ii, jj, 1)=lerp(f, r, color(1));            Img_new(ii, jj, 2)=lerp(f, g, color(2));            Img_new(ii, jj, 3)=lerp(f, b, color(3));        end    end    imshow(Img_new);    imwrite(Img_new, 'out.jpg');

参考来源：http://www.jhlabs.com/index.html

原图：

效果图：