imfinfo unable to open a file

My goal is ultimately to get time stamps for a large number of JPEG images so that I know the time that each frame of video data was collected.

cd(video_dir);
info = imfinfo([video_dir],'jpg');

Which gives the error, "Unable to open file ..." (imfinfo line 163).

I've used this function successfully to extract information about tiff images on the same data, but I don't see why this isn't working for JPEG images.

Answer 1

[dpb]

info = imfinfo([video_dir],'jpg');

Because you didn't give imfinfo a legitimate file name...it's simply looking for a filename that is just a directory name with '.jpg' appended.

There's no indication in the doc's that imfinfo can work on multiple files at a time via wildcard expansion, use dir for that and the process the resulting structure.

Answer 2

[Ben11]

It looks like you try to open a directory instead of an image. I tried your syntax and got the same error.

What if you try something like this:

imfinfo(strcat(video_dir,'/YourImageName.jpg'))

[David Young]

Better to use fullfile than strcat.