STN OCR
This repository contains the code for the paper: STN-OCR: A single Neural Network for Text Detection and Text Recognition
Please use the new code, if you want to experiment with FSNS like data and our approach. It should also be easy to redo the text recognition experiments with the new code, although we did not release any code for that.
The folder datasets
contains code related to datasets used in the paper. datasets/svhn
contains several scripts that can be used to create svhn based ground truth files as used in our experiments reported in section 4.2., please see the readme in this folder on how to use the scripts. datasets/fsns
contains scripts that can be used to first download the fsns dataset, second extract the images from the downloaded files and third restructure the contained gt files.
The folder mxnet
contains all code used for training our networks.
In order to use the code you will need the following software environment:
Install python3
(the code might work with python2, too, but this is untested)
it might be a good idea to use a virtualenv
install all requirements with pip install -r requirements.txt
clone and install warp-ctc
from here
go into the folder mxnet/metrics/ctc
and run python setup.py build_ext --inplace
clone the mxnet repository
checkout the tag v0.9.3
add the warpctc
plugin to the project by enabling it in the file config.mk
compile mxnet
install the python bindings of mxnet
You should be ready to go!
You can use this code to train models for three different tasks.
The file train_svhn.py
is the entry point for training a network using our purpose build svhn datasets. The file as such is ready to train a network capable of finding a single house number placed randomly on an image.
Example:
In order to do this, you need to follow these steps: 1. Download the datasets 2. Locate the folder generated/centered
3. open train.csv
and adapt the paths of all images to the path on your machine (do the same with valid.csv
) 4. make sure to prepare your environment as described in installation 5. start the training by issuing the following command:
`python train_svhn.py <path to train.csv> <path to valid.csv> --gpus <gpu id you want to use> --log-dir <where to save the logs> -b <batch size you want ot use> --lr 1e-5 --zoom 0.5 --char-map datasets/svhn/svhn_char_map.json`
6. Wait and enjoy.
If you want to do experiments on more challenging images you might need to update some parts of the code in train_svhn.py
. The parts you might want to update are located around line 40 in this file. Here you can change the max. number of house numbers in the image (num_timesteps
), the maximum number of characters per house number (labels_per_timestep
), the number of rnn layers to use for predicting the localization num_rnn_layers
and whether to use a blstm for predicting the localization or not use_blstm
.
A quite more challenging dataset is contained in the folder medium_two_digits
, or medium
in the datasets folder. Example:
If you want to follow our experiments with svhn numbers placed in a regular grid you'll need to do the following:
Download the datasets
Locate the folder generated/easy
open train.csv
and adapt the paths of all images to the path on your machine (do the same with valid.csv
)
set num_timesteps
and labels_per_timestep
to 4 in train_svhn.py
start the training using the following command: python train_svhn.py <path to train.csv> <path to valid.csv> --gpus <gpu id you want to use> --log-dir <where to save the logs> -b <batch size you want ot use> --lr 1e-5
If you are lucky it will work ;)
Following our text recognition experiments might be a little difficult, because we can not offer the entire dataset used by us. But it is possible to perform the experiments based on the Synth-90k dataset provided by Jaderberg et al. here. After downloading and extracting this file you'll need to adapt the groundtruth file provided with this dataset to fit to the format used by our code. Our format is quite easy. You need to create a csv
file with tabular separated values. The first column is the absolute path to the image and the rest of the line are the labels corresponding to this image.
To train the network you can use the train_text_recognition.py
script. You can start this script in a similar manner to the train_svhn.py
script.
In order to redo our experiments on the FSNS dataset you need to perform the following steps:
Download the fsns dataset using the download_fsns.py
script located in datasets/fsns
Extract the individual images using the tfrecord_to_image.py
script located in datasets/fsns/tfrecord_utils
(you will need to install tensorflow for doing that)
Use the transform_gt.py
script to transform the original fsns groundtruth, which is based on a single line to a groundtruth containing labels for each word individually. A possible usage of the transform_gt.py
script could look like this:
python transform_gt.py <path to original gt> datasets/fsns/fsns_char_map.json <path to gt that shall be generated>
Because MXNet expects the blank label to be 0
for the training with CTC Loss, you have to use the swap_classes.py
script in datasets/fsns
and swap the class for space
and blank
in the gt, by issuing:
python swap_classes.py <original gt> <swapped gt> 0 133
After performing these steps you should be able to run the training by issuing:
python train_fsns.py <path to generated train gt> <path to generated validation gt> --char-map datases/fsns/fsns_char_map.json --blank-label 0
We've added a nice script that makes it possible to see how well the network performs at every step of the training. This progress is normally plotted to disk for each iteration and can later on be used to create animations of the train progress (you can use the create_gif.py
and create_video.py
scripts located in mxnet/utils
for this purpose). Besides this normal plotting to disk it is also possible to directly see this progress while the training is running. In order to see this you have to do the following:
start the show_progress.py
script in mxnet/utils
start the training with the following additional command line params:
--send-bboxes --ip <localhost, or remote ip if you are working on a remote machine> --port <the port the show_progress.py script is running on (default is 1337)
enjoy!
This tool is especially helpful in determining whether the network is learning anything or not. We recommend that you always use this tool while training.
If you want to evaluate already trained models you can use the evaluation scripts provided in the mxnet
folder. For evaluating a model you need to do the following:
train or download a model
choose the correct evaluation script an adapt it, if necessary (take care in case you are fiddling around with the amount of timesteps and number of RNN layers)
Get the dataset you want to evaluate the model on and adapt the groundtruth file to fit the format expected by our software. The format expected by our software is defined as a csv
(tab separated) file that looks like that: <absolute path to image> t <numerical labels each label separated from the other by t>
run the chosen evaluation script like so
python eval_<type>_model.py <path to model dir>/<prefix of model file> <number of epoch to test> <path to evaluation gt> <path to char map>
You can use eval_svhn_model.py
for evaluating a model trained with CTC on the original svhn dataset, the eval_text_recognition_model.py
script for evaluating a model trained for text recognition, and the eval_fsns_model.py
for evaluating a model trained on the FSNS dataset.
This Code is licensed under the GPLv3 license. Please see further details in LICENSE.md.
If you are using this Code please cite the following publication:
@article{bartz2017stn, title={STN-OCR: A single Neural Network for Text Detection and Text Recognition}, author={Bartz, Christian and Yang, Haojin and Meinel, Christoph}, journal={arXiv preprint arXiv:1707.08831}, year={2017} }
The code contains a huge amount of workarounds around MXNet, as we were not able to find any easier way to do what we wanted to do. If you know a better way, pease let us know, as we would like to have code that is better understandable, as now.
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