2009/10/9 Stéfan van der Walt <stefan@sun.ac.za>
Hey Ralph
2009/10/9 Ralf Gommers <ralf.gommers@googlemail.com>:
where all PNGs are access only as necessary, and are cached once they've been read from disk. You can also index into or iterate over an ImageCollection (yielding the image arrays). It sounds like a multi-image could be interpreted as an ImageCollection.
That sounds like a good option. Let me know if you want me to test it / work on it / send you some multi-image files.
I'd appreciate it if you could investigate a bit further. The code I was referring to is at
As you can see, it is very simplistic. It also returns a bunch of Image objects, that we don't need. But the basic idea is there: a container over which you can iterate, that loads images on demand and keeps a cache as necessary. I've never played with loading of multi-layer images, so I hope you can get something going.
Thanks Stefan, that was a useful start. I added a MultiImg class which is quite similar to your ImgCollection. There are enough differences between a multi-image file and a collection of single image files to justify creating a separate class I think. The code is here: http://github.com/rgommers/scikits.image/blob/imgcollection/scikits/image/io... It works with my multi-frame TIFF files (only PIL trunk, not 1.1.6), and once I figure out how to create a correct TIFF header/file (does anyone have code for this?) I can add a self-contained example and tests. Things that would be useful to add: - caching a configurable number of frames (now 1 or all) - a dtype keyword - switch to the new IO plugin system once it's ready - add a MultiImgCollection - what else? Questions: - do you want to keep the Image class in that form? It seems either a plain ndarray or ndarray + tags dict is enough. - can I remove the EXIF stuff or move it to a subclass of Image? I don't think it belongs in the base Image class. - should imread be moved into io.py? I'd appreciate any feedback on the basic design and new feature suggestions. Cheers, Ralf
Cheers Stéfan