Action_Recognition

This is an implementation of action recognition algorithm based on scene. The algorithm utilizes the Inception v3 model and the LSTM model and is implemented using the tensorflow platform. This algorithm is suitable for video containing individual actions. (Because it is an early implementation, the project may contain Chinese)
The overall process of the algorithm is as follows:

The process description: firstly, a video with variable length is sampled with the same number of frame images at different frame intervals to form the image sequence group of video.Each image is extracted by the Inception v3 convolutional neural network trained on the ImageNet dataset to obtain a feature sequence group for each video.Then input the feature sequence group of fixed length into LSTM network in time order, extract the spatio-temporal features of the sequence, and complete the action classification task through the full connection layer and the softmax layer.

Dependencies

python >= 3.5
tensorflow >= 1.12
In addition, please add the project folder to PYTHONPATH and pip install the following packages:

• glob
• tqdm

Also, you need to install ffmpeg to process video.

Data Preprocessing

Download the UCF101 dataset. Then extract them to data/.
Download the Inception_v3 model pretrained on ImageNet with the verification code ej0f to inception_v3/.
You need to execute the following steps successively to implement the data preprocessing:

• In data/ directory, you need to run move_files.py to split dataset into train and test, and move them to the appropriate folder.
• Then, in the same directory, you need to run extract_files.py to extract useful video information, such as video name, label, number of frames and so on.
• finally, in the project root directory, you need to run extract_cnn_features.py to extract cnn_feature of each images.

Training

You can adjust the parameters to specify the categories to be trained, and if you have sufficient computing resources, ignore the parameters for this problem. You can simply run train_lstm.py to train the model.

Test

You can simply run demo.py to test your model. By the way, you should select a model file to initialize model parameters. You can simply assign the path of the model file to the corresponding parameter.

Result

I randomly selected 10 classes in UCF101 dataset for training. Using the test dataset to test the model, the accuracy of video action prediction can reach more than 90%.