sudo apt-get install imagemagick
#把 .png 转到 .jpg convert *.png *.jpg rm -r *.png
imagePath='sequences/SegTrack/birdfall2/';
files=dir([imagePath,'*.png']);
for i=1:length(files)
image=imread(fullfile(imagePath,files(i).name));
imwrite(image,[sprintf('%08d',i),'.jpg'],'jpg');
end原文：http://blog.csdn.net/jxlijunhao/article/details/38563733