NetherlandsForensicInstitute/vuurwerkverkenner-application-data

Vuurwerkverkenner

This dataset is utilized by the Vuurwerkverkenner application to link fragments of exploded (heavy) fireworks to their originating firework types. You can explore the application at www.vuurwerkverkenner.nl. The dataset includes various firework types examined in casework by the Netherlands Forensic Institute.

Categories

Firework wrappers that closely resemble each other visually may be grouped into categories. Typically, a wrapper stands alone without resemblance to others, forming a category with one unique wrapper.

Contents

The dataset comprises 217 categories, featuring a total of 347 unique wrappers. It is organized as follows:

reference_data 
└───bigboy 
  └─── big boy xl 
    └─── wrapper.png 
    └─── compleet exemplaar.png
  └─── bigboy
    └─── wrapper.png 
    └─── compleet exemplaar.png
└───atomyc 
  └─── atomyc 3 
    └─── wrapper.png
    └─── compleet exemplaar.png
    └─── gedemonteerd.png
└───meta.json.gz 

The top-level folders (bigboy, atomyc, ...) indicate the firework categories. The next level (big boy xl, atomyc 3, ...) identifies specific wrappers within each category. For each wrapper, one or more images may be included. At a minimum, wrapper.png, a scan of the complete wrapper, is present. Additional images, like photographs of the whole firework article or schematic drawings of its internals, may also be available.

In meta.json.gz, both metadata and reference embeddings for each firework category are stored. It aligns in structure as follows:

{ 
  "bigboy": {
    "big boy xl": {
      "embeddings": [[...], [...], ...], 
      "wrappers": {
          "wrapper_text": "abcdef", 
          "article_name": "abc",
          ... 
        },
      }, 
    }, 
} 

The first level (meta['bigboy'], meta['butterfly'], ...) denotes the firework category corresponding to the top level of photo folders (e.g., meta[0] matches the folder bigboy). The second level (meta['bigboy']['big boy xl'], meta['bigboy']['bigboy'], ...) identifies individual wrappers within the category, aligning with the second level of photo folders (e.g., meta['bigboy']['big boy xl'] corresponds to bigboy/big boy xl). Each wrapper holds reference embeddings and metadata. The third level, such as meta['bigboy']['big boy xl']['wrappers'], aligns with a specific wrapper's photo folder (like bigboy/big boy xl/wrapper.png). Embeddings stored at this level are used to compare embeddings of uploaded images in the application with.

Reference embeddings

Reference embeddings are provided for each category. These are generated by an AI model trained to create embeddings for firework wrappers and exploded wrapper snippets. When snippets from a category are fed into the model, they should yield similar embeddings to those for the wrappers. For further details on the model, see here.

Metadata

Metadata for each wrapper includes various fields, described as follows:

Field	Description
text	Full text present on the wrapper (excluding non-Latin alphabets).
endangerment	The level of danger or risk associated with the firework.
article_name	The name of the item.
firework_type	The type of firework.
firework_category	The category or classification of the firework.
tube_length	The length of the tube.
tube_diameter	The diameter of the tube.
composition_burst_charge	The composition of the main charge of the firework.
composition_other_mixtures	The composition of other charges of the firework.
mass_burst_charge	The mass of the main charge.
mass_other_mixtures	The mass of other charges.