Image dataset that contains SIFT features

I have to test two component of a software: the first extracts SIFT features from an image and the second tags the same image starting from his extracted features.

I'm looking for a test-image-dataset that has

• at least 1k images


• SIFT descriptors and tags for each image

I found these huge dataset on http://ift.tt/T4Dz6Y that contains what I need, but the features files are corrupted.

1) If anyone worked with ImageNet: I've downloaded all features files for each synset, but I can't open *.vldsift.mat files, so I can't read and manipulate the features for each image. Files *.sbow.mat seems to be correct (MATLAB opens them) but I need to work with raw SIFT descriptors. MATLAB also opens correctly the "tags file" attrann.mat, so the only problem is to open *.vldsift.mat files. I tryed to read them in other ways, such using JMatIO library for java, but these files seem to be generated uncorrectly (found errors in the file compression, termination, etc.). I use MATLAB 2010a. Anyone can help me?

2)If not: Anyone knows a dataset like this? Thanks.