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Detect and Classify Numbers in Real-World Images

This prject is written for Udacity machine leanring nanodegree capstone project that intended to solve the detiction problem with number digits in real-world images. Given a real-world image that contains any amount of number digits with any font, color, and/or size exist anywhere in the image. The project is trying to identify the location and the class of each of the digits. It breaks down the problem into two sub-problems. First, it uses state of the art OverFeat for region proporal of digit regions. Second, it uses neural network to classify each proposed region for the digit. Special thanks to Russell Stewart for open source the implementaion of Overfeat in TensorFlow, TensorBox.

Alt text

Number Detection With Pre-trained Model

Make sure you have TensorFlow installed on your computer befroe you start. You may also need to install numpy, scipy, PIL, and verious of python libraries if you don't already have them.

  1. Clone this repository.
  2. Download googlenet.pb, classification_model.ckpt, and overfeat_checkpint.ckpt into data directory via runing download_models.sh.
  3. Put the your image(s) in images_input folder.
  4. If you only have one image to evaluate, enter python evaluation.py <image.jpg> in Terminal. Make sure to replace <image.jpg> with the file name of your image and to include the filename extension.
  5. If you want to evaluate on all images in the folder, simply enter python evaluation.py in Terminal.
  6. There are already 21 images in the images_input folder that you can try it out yourself.
  7. The Terminal will show the average time used for each image evaluation once all the images are evaluated. The results will be in the images_output folder. A .json file with all detected digits will also be generated in data folder.

Training on New Data

Here I will go through the steps to train on the SVHN dateset. You can replace the data with your own dataset.

Download and Preprocess Datasets

  1. Download and extract train.tar.gz, and test.tar.gz into the root of this repository.
  2. If you have Matlab installed on your computer, you can copy mat_to_txt.m into train and test directory to convert digitStruct.mat to txt file.
  3. You can also get my generated verson from train and test. Move each txt into their corresponding folder. If you are interested in training on bigger set, I also have extra available.
  4. Run overfeat_data_processing.py in the SVHN folder of this repository. It will automaticlly generate resized images, .idl, and .json for TensorBox to train on.
  5. Copy overfeat_rezoom.json from the root of this repository into TensorBox's hypes folder and copy SVHN folder from this repository into TensorBox's data folder. You should be ready to train with TensorBox.
  6. Run character_classification_data_processing.py in this repository, it should automaticlly generate the pickle files of image data and labels for our classification networks.

Training and Perpare for Evaluation

  1. Region proposal will be trained using TensorBox. Please refer to TensorBox for more detail.
  2. After TensorBox is trained, rename the .ckpt file with overfeat_checkpint.ckpt and copy it into the data folder of this repository.
  3. Run classification_networks.py in this repository to train the classification networks.
  4. The check point file will be stored in /tmp folder. Rename the .ckpt file with classification_model.ckpt and copy it into the data folder in this repository.
  5. If you don't already have googlenet.pb in the data folder of this repository, download it from here.
  6. After all files are trained and in place, run python evaluation.py to evluate all images in images_input folder or python evaluation.py <image.jpg> for a specific image. Results will be shown in images_output folder.