Read LevelDB format from Matlab

Question

I am working on Caffe. I already extract features using extract_features.bin, it will create a result as this figure below. It said that the feature will stored in LevelDB format. But, since I almost work in MATLAB, so I want to read this output on my MATLAB. But, I still cannot find a way how to do that. Anybody could help me?

score 2 · Answer 1 · answered Aug 10 '16 at 07:19

Alternatively, you can use python to read the leveldb, save it to mat-file and process it in Matlab.

For this workaround to work, you'll need py-leveldb (and python...)

In python

import leveldb      # for reading leveldb
import numpy as np  # for manipulating the data
import scipy.io     # for writing to mat file

data = []
db = leveldb.LevelDB('/path/to/output400_flickr_fc7')
for key, value in db.RangeIter():
    data.append( np.array(value) )

scipy.io.savemat('/path/to/output400_flickr_fc7.mat', {'data': np.hstack(data)})

Now you should be able to load in Matlab (should be stored to data variable)

>> load('/path/to/output400_flickr_fc7.mat');

Thank you @Shai, I will try this – nafilatur2724 Aug 10 '16 at 11:55 — nafilatur2724, Aug 10 '16 at 11:55

score 1 · Answer 2 · answered Aug 10 '16 at 06:45

1

Have you looked at this git project?
This project seems to implement a wrapper for reading leveldb datasets into matlab.

answered Aug 10 '16 at 06:45

Shai

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thank you for helping me. Ok, I will check that git project. – nafilatur2724 Aug 10 '16 at 06:47
1

thats project is designed for UNIX. But, now i am working on windows. So do you have any recommendation? – nafilatur2724 Aug 10 '16 at 07:00
the data is read from leveldb as string, how would you convert it to image? – dolbi Sep 11 '16 at 08:40

Read LevelDB format from Matlab

2 Answers2