动态目标跟踪【图像序列读取】问题，有大佬可以帮忙看一下吗

Q：动态目标跟踪 - 【图像序列读取】问题报错部分：

错误使用 imread>get_full_filename (line 516)

文件 "1.jpg" 不存在。

出错 imread (line 340)

    fullname = get_full_filename(filename);

出错 testvideo_mm2 (line 62)

    lm=imread(myfile(l).name);

原代码：

%%%%%%%%%%%%%%%%%%读取序列图像%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

myfile=dir('/Users/yulu/Documents/xulie/*.jpg');  %存序列图像

lengthfile=length(myfile);

for l=1:lengthfile

    lm=imread(myfile(l).name);

num=0;

Y=[1.5,1.5];

%%%%%%%%%%%%%%%%%% mean shift迭代%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%略