Video content classifier

An Inception-v3 CNN is daisy-chained to an LSTM RNN in order to classify videos into one of 6 categories:

1. Safe
2. Violence
3. Gun
4. Cold_Arms
5. Smoking
6. Kissing

A .ipynb file is also included which takes care of dataset prep and training the models. It can be used exclusivly to get the weight files but must be used along with Google Drive if using Google Colab.

Requirements

This code requires you have Keras 2 and TensorFlow 1 or greater installed. Please see the requirements.txt file. To ensure you're up to date, run:

pip install -r requirements.txt
apt install gpac
pip install tqdm

You must also have ffmpeg installed in order to extract the video files. If ffmpeg isn't in your system path (ie. which ffmpeg doesn't return its path, or you're on an OS other than *nix), you'll need to update the path to ffmpeg in data/extract_files.py.

Getting the data

Download the datasets and place the zip files in the data folder:
http://mvig.sjtu.edu.cn/research/adha/download.html
https://www.kaggle.com/mohamedmustafa/real-life-violence-situations-dataset
http://kt.agh.edu.pl/~grega/guns/

Next, create folders (still in the data folder) with:
mkdir train test sequences checkpoints demo
cd ./test/ && mkdir Safe Violence Gun Cold_Arms Smoking Kissing
cd ./train/ && mkdir Safe Violence Gun Cold_Arms Smoking Kissing

Move the contents of the specified directories from the ADHA dataset into the train directories:

Safe

brush_hair
pour
pick
dive
talk
shake_hands
hug
climb_stairs
stand
pullup
wave
chew
sit
eat
walk
clap
drink
run

Violence

punch
hit

Gun

shoot_gun

Cold_Arms

sword
sword_exercise
draw_sword

Smoking

smoke

Kissing

kiss

Now, from the data directory run:
./data_prep

Now you can run the script in the data folder to extract frames from the videos and make the CSV file for the rest of the code references.
python extract_files.py

Training models

The Inception CNN is trained first using the train_cnn.py script.

Before you can run the LSTM , you need to extract features from the images with the CNN. This is done by running extract_features.py.

The LSTM is trained using the train.pyscript.

The LSTM is defined in models.py. Reference that file to see the model you are training in train.py.

Training logs are saved to CSV and also to TensorBoard files. To see progress while training, run tensorboard --logdir=data/logs from the project root folder.

The weight files are in the data/checkpoints directory.

Demo/Using models

First place the videos that are to be classified into the demo directory present in the data directory. After ensuring the appropriate weight files are set in the demo.py script run it.

Video files should be in AVI format

Please Note: Due to a lack of adequate training data for the last 3 classes, the model is not able to generalize very well for them. An improvement could be to include more training data for the same.

Dataset Citation

Action clips dataset

Pang, Bo, Kaiwen Zha, and Cewu Lu. "Human Action Adverb Recognition: ADHA Dataset and A Three-Stream Hybrid Model." Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition Workshops. 2018. http://mvig.sjtu.edu.cn/research/adha/download.html

Violence clips dataset

Real Life Violence Situations Dataset
https://www.kaggle.com/mohamedmustafa/real-life-violence-situations-dataset

Gun clips dataset

Grega, Michał, Seweryn Łach, and Radosław Sieradzki. "Automated recognition of firearms in surveillance video." 2013 IEEE International Multi-Disciplinary Conference on Cognitive Methods in Situation Awareness and Decision Support (CogSIMA). IEEE, 2013 .
http://kt.agh.edu.pl/~grega/guns/