MATLAB将图片做成视频

myobj= VideoWriter('i_d20.avi');
myobj.FrameRate = 2;
open(myobj)
for i=1:45
    fname = strcat('.\i_d20\',num2str(i), '.png'); %数据保存路径
    frame = imread(fname);
    writeVideo(myobj, frame);
end
close(myobj)