NetherlandsForensicInstitute/vuurwerkverkenner-data

Vuurwerkverkenner

This dataset is used by the Vuurwerkverkenner, an application for linking snippets of exploded (heavy) fireworks to the type of firework that they originate from. You may find the application at www.vuurwerkverkenner.nl. The dataset consists of different types of fireworks that were investigated in casework by the Netherlands Forensic Institute.

Categories

If firework wrappers are very similar in their visual appearance, they may be grouped into categories. In most cases, a wrapper is not similar to any other wrapper, and a category simply consists of one unique wrapper.

Contents

The dataset consists of 185 categories, containing 332 unique wrappers in total. The dataset is organized as follows:

vuurwerkverkenner-data 
└───fireworks_0 
  └─── wrappers 
    └─── 0 
      └─── wrapper.jpg 
      └─── compleet exemplaar.jpg
      └─── gedemonteerd.jpg
    └─── 1 
      └─── wrapper.jpg 
      └─── compleet exemplaar.jpg 
      └─── gedemonteerd.jpg 
└───fireworks_1 
  └─── wrappers 
    └─── 0 
      └─── wrapper.jpg 
└───meta.json.gz 

The first level of folders (fireworks_0, fireworks_1, ...) corresponds to the category. The third level (0, 1, ...) corresponds to the wrappers within the category. For each wrapper, one or multiple images may be present. In each case, wrapper.jpg should be present, which is a scan of the full wrapper. Additionally, other images may be present as well, such as the entire fireworks article or a schematic drawing of its contents.

In meta.json.gz, we store both metadata and reference embeddings for the firework categories. It has the following structure:

{ 
  0: {
    "embeddings": [[...], [...], ...], 
    "wrappers": [ 
      0: {
        "wrapper_text": "abcdef", 
        "article_name": "abc",
        ... 
      }, 
      1: {...},
      2: {...} 
    ] 
  }, 
  1: {...} 
} 

The first level (meta[0], meta[1], meta[2] ...) indicates the fireworks category, which corresponds to the first level of the photo folders (i.e. meta[0] matches the folder fireworks_0).
Each category contains the reference embeddings and the metadata for each wrapper.
The third level, e.g. meta[0]['wrappers’][0], indicates the wrapper within the category and corresponds to the photo folder of that wrapper (e.g. fireworks_0/wrappers/0).

Reference embeddings

For each category, reference embeddings are provided. They are constructed by an AI model that is trained to create embeddings for (photos of) firework wrappers and snippets of exploded wrappers. When fed to this model, photos of snippets that belong to a given category should have similar embeddings to the ones for the wrappers. For more details about the model, see (here)[https://huggingface.co/NetherlandsForensicInstitute/vuurwerkverkenner].

Metadata

For each wrapper, metadata is provided. The fields are described below.

Field	Description
text	The full text that is 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.