matlab 显示黑色,为什么我的图象最后是黑色的？？

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%通过颜色特性来判别烟雾。

% function FlameChar1=IrregularityTestOK(picfile,pickind,filelist,flamenum,BackPic)

%%%%%%%%%%%%%%%%%%%%%%%%%%测试用%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

picfile=('工地旁烟雾\');

flamenum=6;

pickind=('jpg');

filelist=dir('C:\Documents and Settings\Administrator\桌面\测试图片\工地旁烟雾\*.jpg');

BackPic='WareBack1.jpg';

%%%%%%%%%%%%%%%%%%%%%%%%%%测试用(END)%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

x1=imread('1.jpg'); % 读取jpg文件

% x2=imread('2.jpg');

% change to HSI model x11=rgb2hsi(x1);

% 将rgb格式的图形格式转换为hsi图形格式，将(红，绿，蓝)变为(灰度，饱和度，亮度)

% x22=rgb2hsi(x2);

% x1r=im2double(x1(:,:,1));%图形格式改为double格式

% x1g=im2double(x1(:,:,2));

% x1b=im2double(x1(:,:,3));

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