MATLAB and reading data from multiple series

[fordanic]

In the current implementation of bfopen.m it is possible, and probably preferable, to input the parameters x, y, w, h to set an arbitrary image tile to be read from the file.

However, given that the file contains several series, e.g. both subsampled versions of the original image but also label, macro and thumbnail images, the parameters are not relevant for the other series contained in the file. For subsampled images the parameters could simply be scaled according to the scale factor and for label, macro and thumbnail images they should not be applied at all. So far so good.

When I have been playing around with a couple of images from Apeiro and Hamamatsu, download from openslide.org, I don't seem to find any metadata that I can use to determine what kind of image that is contained in the current series. So far it seems that the first series is the original image, and then comes a number of subsampled images and finally the label, macro and thumbnail images. But I cannot determine the number of subsampled images.

Any suggestions?

/Daniel

[sbesson]

Hi Daniel,

you are right. The propagation of the optional (x,y,w,h) tile input is not working well in the case of multi-series images. The main problem here is that the relationship between images in a multi-series file is very dependent of the image format.

You may be able to access information on the type of image using retrieval methods on the populated OME metadata. For instance, looking at the SVS specifications, you should be able to retrieve this information using getImageDescription():

Code: Select all

bfCheckJavaPath();
r = bfGetReader('CMU-1.svs')
r.getMetadataStore().getImageDescription(0)
r.getMetadataStore().getImageDescription(1)
r.getMetadataStore().getImageDescription(2)
r.getMetadataStore().getImageDescription(3)
r.getMetadataStore().getImageDescription(4)
r.getMetadataStore().getImageDescription(5)


or for VMS images, using the getImageName() method:

Code: Select all

bfCheckJavaPath();
r = bfGetReader('CMU-1-40x - 2010-01-12 13.24.05.vms')
r.getMetadataStore().getImageName(1)
r.getMetadataStore().getImageName(2)
r.getMetadataStore().getImageName(3)


Hope this helps,
Sebastien

[fordanic]

Ok, it seems to provide some sort of information that can be used. Cheers.

You refer to the specification of SVS as way of finding out which metadata to use. Is this something that is available for others or how can I know which tags to look at when working with various images?

Best,
Daniel

[sbesson]

Hi Daniel,

generally, the Supported formats section of the Bio-Formats documentation should contain some valuable information in terms of the available metadata.

For instance in the case of the Aperio SVS TIFF format, the Aperio SVS TIFF page gives you an overview of the format including the supported versions and the SVS Reader page lists all the metadata that can be retrieved from the MetadataStore.

Hope this answers your question,
Sebastien

[fordanic]

Once again, thank you so much for your help.

/Danne