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Python Platform PyTorch License Topprism

视频广告检测器

这是一个使用多模态大模型(Google Gemma 3N)自动检测视频中是否包含已知广告素材的工具。

功能特性

  • AI驱动: 利用先进的多模态大模型 google/gemma-3n 理解视频帧内容。
  • 高效预处理: 在进行AI分析前,使用感知哈希算法对视频帧进行图像聚类,有效去除冗余和重复的帧,仅将代表性场景提交给AI,大幅提升处理效率。
  • 语义理解与描述: 将视频关键帧转换为富有语义的文本描述,作为其内容的“语义指纹”。
  • 精准片段检测: 通过对代表性帧进行语义相似度比对,精确识别实拍视频中包含广告内容的具体片段和时间点。
  • 自动化深度报告: 如果检测到匹配的广告,能自动生成包含详尽分析的PDF报告,其核心亮点包括:
    • 并排证据对比: 将“实拍视频截图”与“源素材截图”并排展示,证据一目了然。
    • 精确时间戳: 在每一组对比图下方,都清晰标注了镜头在各自视频中的时间点。
    • 时长分析: 在报告中明确对比“源素材总时长”与“广告在实拍视频中累计出现的总时长”。
  • 批量处理: 支持一次性上传和分析多个视频。

工作原理

项目的工作流程分为两个阶段:

  1. 素材入库 (add_material):

    • 用户通过界面上传已知的广告“素材视频”。
    • 系统自动从素材视频中提取关键帧(如第一帧、中间帧、最后一帧)。
    • 对每个关键帧,系统利用 LM Studio 提供的 Gemma 3N 多模态模型生成详细的语义描述
    • 这些语义描述被存储在本地数据库中,作为比对基准。
  2. 广告检测 (detect_ad):

    • 用户通过界面提交一个或多个需要检测的“实拍视频”。
    • 系统对每个实拍视频进行批量抽帧
    • 使用感知哈希算法 (imagehash) 对所有抽取的帧进行聚类,为每个视觉上相似的场景组推选出一个代表帧
    • 对每个代表帧,系统利用 Gemma 3N 多模态模型生成其语义描述
    • 将代表帧的语义描述与数据库中所有素材的语义描述进行语义相似度计算(通过文本嵌入向量的余弦相似度)。
    • 当语义相似度超过预设阈值时,系统会记录下这个匹配的时间点。
    • 检测完成后,系统会整理所有匹配数据,并调用报告模块生成包含并排对比图、时间戳和时长分析的最终PDF报告。

技术栈

  • 核心框架: Python
  • AI模型: google/gemma-3n (多模态理解,通过 LM Studio API)
  • 文本嵌入: nomic-ai/nomic-embed-text-v1.5 (语义相似度计算,通过 LM Studio API)
  • 图像聚类: ImageHash
  • 机器学习: PyTorch, scikit-learn
  • 视频/图像处理: OpenCV, Pillow
  • 报告生成: ReportLab
  • Web界面: Streamlit

安装与配置

  1. 克隆本项目:

    git clone https://github.com/guohongbin-git/video_ad_detection.git
    cd video_ad_detection
  2. 创建并激活虚拟环境:

    python3 -m venv .venv
    source .venv/bin/activate
  3. 安装依赖:

    pip install -r requirements.txt
  4. LM Studio 配置:

    • 安装并运行 LM Studio: 确保您已安装 LM Studio 并正在运行。
    • 下载并加载模型: 在 LM Studio 中下载并加载 gemma-3n 系列的多模态模型。
    • 核对模型标识符: 确保 video_ad_detector/config.py 文件中的 LM_STUDIO_CHAT_MODEL_NAME 与您在 LM Studio 中为模型设置的模型标识符完全一致。
    • 启用 OpenAI 兼容 API: 确保 LM Studio 的 OpenAI 兼容 API 服务已开启(通常在 http://localhost:1234)。
    • 配置嵌入模型: 在 LM Studio 中下载并加载一个文本嵌入模型(例如 nomic-ai/nomic-embed-text-v1.5),并确保 config.py 中的 LM_STUDIO_EMBEDDING_MODEL_NAME 与之匹配。

使用方法

  1. 激活虚拟环境:

    source .venv/bin/activate
  2. 启动应用:

    streamlit run run_gui.py
  3. 操作:

    • 在打开的网页界面中,使用侧边栏的“Add New Ad Material”功能录入广告素材。
    • 使用“Detect Ad in Videos”功能上传一个或多个待检测视频。
    • 结果会直接显示在主界面上,并可以生成PDF报告。

项目结构

.
├── video_ad_detector/
│   ├── __init__.py
│   ├── ad_detector.py       # 核心检测逻辑:语义分析、片段匹配
│   ├── app.py               # 命令行程序的入口点 (当前主要使用GUI)
│   ├── config.py            # 配置文件(API、模型、阈值等)
│   ├── database.py          # 数据库操作
│   ├── feature_extractor.py # 调用AI模型进行描述生成和文本嵌入
│   ├── gui.py               # Streamlit Web界面代码
│   ├── reporter.py          # 生成PDF报告
│   ├── video_processor.py   # 视频处理:抽帧、图像聚类
│   └── ...
└── README.md

Python Platform PyTorch License Topprism

Video Ad Detector

This is a tool that uses a multimodal large model (Google Gemma 3N) to automatically detect whether a video contains known ad materials.

Features

  • AI-Powered: Utilizes the advanced multimodal large model google/gemma-3n to understand video frame content.
  • Efficient Pre-processing: Employs perceptual hashing for image clustering of video frames before AI analysis. This effectively removes redundant frames, submitting only representative scenes to the AI and significantly boosting processing efficiency.
  • Semantic Understanding: Converts video keyframes into rich semantic descriptions, serving as their content "fingerprint."
  • Precise Segment Detection: Accurately identifies ad segments by performing semantic similarity comparison on representative frames.
  • Automated In-depth Reporting: Generates detailed PDF reports for matched ads, featuring:
    • Side-by-Side Evidence: Displays recorded video screenshots next to source material screenshots.
    • Precise Timestamps: Annotates each comparison with exact timestamps.
    • Duration Analysis: Compares source material duration with the total matched duration in the recorded video.
  • Batch Processing: Supports uploading and analyzing multiple videos at once.

How It Works

The project workflow is divided into two phases:

  1. Material Ingestion:

    • The user uploads known ad "material videos" via the UI.
    • The system extracts keyframes (e.g., first, middle, last).
    • For each keyframe, the Gemma 3N model (via LM Studio) generates a detailed semantic description.
    • These descriptions are stored in a local database as a baseline.
  2. Ad Detection:

    • The user submits one or more "recorded videos" for detection.
    • The system performs frame extraction for each video.
    • It then clusters all extracted frames using a perceptual hashing algorithm (imagehash), selecting a single representative frame for each visually similar group.
    • For each representative frame, the Gemma 3N model generates a semantic description.
    • The system calculates the semantic similarity (cosine similarity of text embeddings) between the representative frame's description and all material descriptions in the database.
    • When similarity exceeds a preset threshold, the match is recorded.
    • Finally, a PDF report is generated with side-by-side comparisons, timestamps, and duration analysis.

Tech Stack

  • Core Framework: Python
  • AI Model: google/gemma-3n (multimodal understanding, via LM Studio API)
  • Text Embedding: nomic-ai/nomic-embed-text-v1.5 (semantic similarity, via LM Studio API)
  • Image Clustering: ImageHash
  • Machine Learning: PyTorch, scikit-learn
  • Video/Image Processing: OpenCV, Pillow
  • Report Generation: ReportLab
  • Web Interface: Streamlit

Installation and Setup

  1. Clone this repository:

    git clone https://github.com/guohongbin-git/video_ad_detection.git
    cd video_ad_detection
  2. Create and activate a virtual environment:

    python3 -m venv .venv
    source .venv/bin/activate
  3. Install dependencies:

    pip install -r requirements.txt
  4. LM Studio Configuration:

    • Install and run LM Studio.
    • Download and load a gemma-3n series multimodal model in LM Studio.
    • Verify Model Identifier: Ensure the LM_STUDIO_CHAT_MODEL_NAME in video_ad_detector/config.py exactly matches the Model Identifier you set for the model in LM Studio.
    • Enable OpenAI Compatible API: Make sure the API server is running (typically at http://localhost:1234).
    • Configure Embedding Model: Download and load a text embedding model (e.g., nomic-ai/nomic-embed-text-v1.5) and ensure LM_STUDIO_EMBEDDING_MODEL_NAME in config.py matches.

Usage

  1. Activate the virtual environment:

    source .venv/bin/activate
  2. Launch the application:

    streamlit run run_gui.py
  3. Instructions:

    • Use the "Add New Ad Material" section in the sidebar to ingest ad materials.
    • Use the "Detect Ad in Videos" section to upload one or more videos for analysis.
    • Results will be displayed in the main area, with options to generate a PDF report.

Project Structure

.
├── video_ad_detector/
│   ├── __init__.py
│   ├── ad_detector.py       # Core detection logic: semantic analysis, segment matching
│   ├── app.py               # Entry point for CLI (GUI is primary)
│   ├── config.py            # Configuration (API, models, thresholds)
│   ├── database.py          # Database operations
│   ├── feature_extractor.py # AI model calls for descriptions and embeddings
│   ├── gui.py               # Streamlit Web UI code
│   ├── reporter.py          # PDF report generation
│   ├── video_processor.py   # Video processing: frame extraction, image clustering
│   └── ...
└── README.md

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