| # Data dictionary |
|
|
| ## Images and ImageFolder rows |
|
|
| `data/test/metadata.jsonl` has one row per image. `file_name` is relative to |
| `data/test/`; the manifest uses paths relative to the repository root. |
|
|
| | Field | Meaning | |
| | ----------------------------- | --------------------------------------------------------- | |
| | `image_id` | Stable string identifier; join key across native files | |
| | `category` | `synthetic` or `trap`; both contain generated images | |
| | `width`, `height` | Original raster dimensions in pixels | |
| | `plausibility`, `naturalness` | Final ordinal ratings, integers 1–5 | |
| | `no_violation_detected` | True only for a usable negative | |
| | `method_id` | Ground-truth resolution method, e.g. `GT-004` | |
| | `objects.category_id` | List of integer class IDs, 1–97 | |
| | `objects.bbox` | Parallel list of normalised `[x, y, width, height]` boxes | |
|
|
| The loader exposes `image` as a decoded PIL image. Empty object lists are valid |
| negative examples. There is one evaluation `test` split, no training split. |
| `release/image_manifest.jsonl` adds the original image SHA-256 and byte count. |
|
|
| IDs and categories are strings; dimensions and class IDs are integers. Boxes |
| contain four floating-point values. Ratings are integers, and |
| `no_violation_detected` is a boolean. The two `objects` lists have the same |
| length: elements at the same index describe one instance. `category` records the |
| source grouping, not the final positive/negative judgement. |
|
|
| ## Native annotations |
|
|
| `annotations/ground_truth.json` is an array of records with `image_id`, `kind`, |
| `gold`, `base_annotator`, `source_annotators`, `adjudicated_by` and |
| `edit_summary`. `gold.violations` contains `use_case_id` (`U01`–`U97`) and |
| normalised XYWH `bbox`. It also contains the quality ratings and usable/negative |
| state. The complete resolution provenance is in `edit_summary.resolution`, |
| including `method_id`, name and version. `kind` alone does not identify how gold |
| was obtained. |
|
|
| `gold.reported` is false for every released final annotation. A usable negative |
| has an empty violation list and `no_violation_detected: true`; a positive has |
| one or more violations and `no_violation_detected: false`. Each violation |
| retains its class name. Bounding boxes have positive width and height, with all |
| edges inside the full-image range [0, 1]. |
|
|
| `agreement_at_gold` is an optional historical agreement snapshot, not a new |
| comparison of final labels. `base_annotator` and `adjudicated_by` can be null; |
| actor references are opaque pseudonyms, not sortable identities. For rating |
| meanings, use the [annotation rubric](annotation-protocol.md#the-rating-rubric). |
|
|
| `annotations/first_pass_annotations.json` is an array joined by `image_id`. |
| `first_pass` holds original per-annotator payloads; `n_first_pass` is their |
| count. Actor IDs remain pseudonyms. Administrative text, personnel timestamps |
| and local replay paths are nulled; free-form notes are emptied. Class labels, |
| box coordinates, ratings, state, record order and provenance identifiers are |
| preserved. The original local files have different hashes because these |
| administrative fields were removed. Source hashes are retained in provenance. |
|
|
| First-pass records also retain their original agreement snapshot and state |
| flags. A reported or unfinished submission must not be inferred to be a clean |
| negative merely because it has no boxes. `n_first_pass` is the actual number of |
| submissions; do not assume exactly two. Null administrative fields mean that |
| information is not distributed, rather than that the event never occurred. |
|
|
| ## COCO compatibility |
|
|
| COCO stands for Common Objects in Context, a widely used object-detection |
| annotation format. `ground_truth_coco.json` is a derived compatibility export: |
|
|
| - `images[].id` is a deterministic integer starting at 1, in sorted stable-ID |
| order. `images[].image_id` retains the native string join key. |
| - `images[].file_name` is relative to the dataset repository root. |
| - `annotations[].image_id` references that integer image ID. |
| - `category_id` 1 maps to `U01`, through 97 mapping to `U97`. |
| - `bbox` is **pixel** XYWH. Multiply native x/width by image width and native |
| y/height by image height. Coordinates are not rounded. |
| - `area` is pixel width × height, and `iscrowd` is 0. Segmentation is absent. |
|
|
| All images, including negatives with no annotation rows, occur in `images`. COCO |
| does not carry the full native rating and resolution provenance; use the native |
| file when those fields are required. |
|
|
| ## Results and provenance |
|
|
| `evaluation/dataset/` holds aggregate composition, first-pass agreement and |
| final rating distributions. `evaluation/models/synthetic11534/results.json` |
| holds valid/common scopes, coverage and per-class metrics; CSV is a summary. |
| Prediction JSONL stores `image_id`, `model_name`, `latency_ms`, `parse_status` |
| and `detections`. Each detection uses an integer `category_id` (1–97), a |
| normalised XYWH `bbox` and, where available, a `score`. Retained scores are |
| evidence and do not control evaluation. |
|
|
| `release/checksums.sha256` covers every publication file except itself. |
| `release/provenance.json` identifies the release, licence and original source |
| filenames and hashes. Source hashes identify the original artifacts before |
| administrative fields were removed; the checksum inventory covers the |
| distributed files. |
|
|
| ## Worked example |
|
|
| Suppose an image is 1,000 pixels wide and 800 pixels high. A native violation |
| with `use_case_id: "U03"` and `bbox: [0.10, 0.20, 0.30, 0.25]` is litter with |
| its top-left corner at pixel (100, 160), width 300 and height 200. The |
| equivalent COCO box is `[100, 160, 300, 200]`; its bottom-right corner is (400, |
| 360). This example is illustrative rather than an additional dataset record. |
|
|
| To trace a real example, take `image_id` from a loaded row, find the same key in |
| both native annotation arrays, and use `release/image_manifest.jsonl` to locate |
| its image. Join COCO annotations through the COCO integer `images[].id`; that |
| integer is not the native string ID. Class integer 3 maps to `U03` in every |
| representation. |
|
|
| A class can occur in several boxes on one image. Keep those instances for |
| localisation; deduplicate only the class IDs for image-level classification. |
|
|
