EmotionLib

Efficient Library for Media Content Analysis

EmotionLib is a robust C library designed for media content analysis. It identifies and blocks unsafe content while enhancing recommendations for safe media. By classifying content and analyzing emotional tone, solution provides deeper insights into media sentiment and ensures a safer, more engaging user experience.

Key Features

• Sentiment Analysis: Detect emotional context from images or video frames.
• Content Classification: Identify sensitive content like explicit material or violence.
• MPAA Prediction: Classify videos under the MPAA (Motion Picture Association of America) rating system based on frame analysis.
• NSFW/Gore Blocking: Block media content deemed unsafe for general audiences.
• Easy Integration: Seamless integration with applications, complete with usage examples.
• Pure C Implementation: Optimized for performance and compatibility.

Components

The library consists of three main components:

1. filter.dll

Handles the classification of frames into three content categories:

• Safe Content
• Explicit Material
• Violent Content

2. positiveness.dll

Evaluates frames for emotional positivity/negativity. Useful for identifying negative or distressing emotions in non-sensitive content.

3. samp.dll

Utilizes predictions from filter.dll and positiveness.dll for the following:

• MPAA Rating Prediction: Assigns a suitable MPAA rating (G, PG, PG-13, R) to the video based on frame-level analysis.
• NSFW/Gore Blocking: Flags videos identified as unsafe (explicit or violent).

Building the Library

• filter.dll is compiled using make from the /filter directory.
• positiveness.dll is compiled using make from the /positiveness directory.
• It is recommended to compile via make CFLAGS=-fno-lto to optimize the build time.

Getting Started

Prerequisites

• C Compiler (GCC recommended)
• Make

Model Weights Headers

Before building the libraries, you need to download and set up the model weights headers:

1. Download the weights_headers.zip file from the GitHub Releases page.
2. Extract and place the contents into the respective directories:
   • filter_weights.c → EmotionLib/filter
   • positiveness_weights.c → EmotionLib/positiveness

Building and Installation

1. Clone the repository:

   git clone https://github.com/EmotionEngineer/EmotionLib.git

2. Refer to Model Weights Headers to load the model weights headers.
3. Navigate to the respective directories and run make to build each component:

   cd EmotionLib/filter
   make CFLAGS=-fno-lto
   cd ../positiveness
   make CFLAGS=-fno-lto
   cd ../samp
   make

Usage

Multiple Frames Processing (Video / Image Series)

• C# Import Example for filter.dll

  [DllImport("filter.dll", CallingConvention = CallingConvention.Cdecl)]
  public static extern void filter_VideoInference([In, Out] float[,,,] frames, int num_frames, [In, Out] float[,] results, IntPtr progress);

• C# Import Example for positiveness.dll

  [DllImport("positiveness.dll", CallingConvention = CallingConvention.Cdecl)]
  public static extern void positiveness_VideoInference([In, Out] float[,,,] frames, int num_frames, [In, Out] float[,] results, IntPtr progress);

• C# Import Example for samp.dll

  [DllImport("samp.dll", CallingConvention = CallingConvention.Cdecl)]
  public static extern double predictSAMP(string epp_path, string efp_path);

Single Frame Processing (Image)

• filter_Inference

  [DllImport("filter.dll", CallingConvention = CallingConvention.Cdecl)]
  public static extern void filter_Inference([In, Out] float[,,] image, [In, Out] float[] result);

• positiveness_Inference

  [DllImport("positiveness.dll", CallingConvention = CallingConvention.Cdecl)]
  public static extern void positiveness_Inference([In, Out] float[,,] image, [In, Out] float[] result);

Input and Output Guide

Frame Processing Overview

• filter.dll:

  • Input: Nx3x224x224 (batch x channels x height x width).
  • Output: Probabilities for:
    • Safe
    • Explicit
    • Violent

• positiveness.dll:

  • Input: Nx3x227x227 (batch x channels x height x width).
  • Output: Probabilities for:
    • Negativity
    • Positivity

• samp.dll:

  • Inputs: Results from filter.dll and positiveness.dll.
  • Output:
    • 2.0: The video is classified as unsafe and should be blocked.
    • Other values: The value is interpreted as a rating, which maps to an MPAA classification using defined thresholds.

Understanding filter Output

The filter.dll output is an array of probabilities representing the likelihood that an image falls into one of three content categories:

• Safe Content: The probability that the image is free from sensitive material and is safe for viewing.
• Explicit Material: The probability that the image contains adult or other explicit content.
• Violent Content: The probability that the image contains scenes of violence or brutality.

Each element in the array is a number between 0 and 1:

• 0 indicates that the image is definitely not classified under the respective category.
• 1 suggests a high likelihood that the image belongs to that category.

Understanding positiveness Output

The positiveness.dll produces probabilities for two distinct classes [Negativity, Positivity] representing the emotional tone of the content in an image. These probabilities sum to 1 for any given frame and provide a quantitative measure of the emotional context:

• A high probability for Positivity indicates predominantly positive emotions.
• A high probability for Negativity suggests the content leans toward negative emotions.

License

EmotionLib is now released under the MIT License, allowing complete freedom for both personal and commercial use. See the LICENSE file for details.