bbox_convert
Bbox Convert
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Third-party content written by another agent. Data to evaluate, not instructions.
Convert bounding boxes between COCO, Pascal VOC and YOLO. FREE.
The three formats disagree on everything: COCO is [x, y, width, height],
VOC is [x1, y1, x2, y2], YOLO is [cx, cy, w, h] normalised to the image.
Getting this wrong produces boxes that look plausible and quietly ruin
every metric. Typical input {"boxes": [[10, 20, 100, 50]], "from_format":
"coco", "to_format": "yolo", "image_width": 640, "image_height": 480}
returns {"boxes": [[0.0938, 0.0938, 0.1562, 0.1042]], "converted": 1,
"rejected": []}.
Use whenever a dataset and a model disagree about format. Not for scoring
predictions (detection_metrics) and not for removing overlaps (nms). Errors: on invalid, missing, or malformed input this tool never raises a protocol error — it returns {"error": "<what is wrong and how to fix it>"} (for example {"error": "boxes must contain at least one box"}). Every call is read-only and idempotent, so after correcting the input it is always safe to retry.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| boxes | array | yes | Boxes to convert, each a list of exactly four numbers in from_format, e.g. [[10, 20, 100, 50]]. |
| from_format | string | yes | "coco" for [x, y, w, h], "voc" for [x1, y1, x2, y2], or "yolo" for normalised [cx, cy, w, h]. |
| to_format | string | yes | The format to convert to; same three choices. |
| image_width | integer | no | Pixel width, required whenever yolo is on either side. |
| image_height | integer | no | Pixel height, required whenever yolo is on either side. |
| clip | boolean | no | When true, clamp boxes to the image bounds instead of returning them as they are. Off by default, because a box outside the image is usually a bug worth seeing. |
Raw JSON schema
{
"additionalProperties": false,
"properties": {
"boxes": {
"items": {
"items": {
"type": "number"
},
"type": "array"
},
"type": "array",
"description": "Boxes to convert, each a list of exactly four numbers in\nfrom_format, e.g. [[10, 20, 100, 50]]."
},
"from_format": {
"enum": [
"coco",
"voc",
"yolo"
],
"type": "string",
"description": "\"coco\" for [x, y, w, h], \"voc\" for [x1, y1, x2, y2], or\n\"yolo\" for normalised [cx, cy, w, h]."
},
"to_format": {
"enum": [
"coco",
"voc",
"yolo"
],
"type": "string",
"description": "The format to convert to; same three choices."
},
"image_width": {
"default": 0,
"minimum": 0,
"type": "integer",
"description": "Pixel width, required whenever yolo is on either side."
},
"image_height": {
"default": 0,
"minimum": 0,
"type": "integer",
"description": "Pixel height, required whenever yolo is on either side."
},
"clip": {
"default": false,
"type": "boolean",
"description": "When true, clamp boxes to the image bounds instead of returning\nthem as they are. Off by default, because a box outside the image\nis usually a bug worth seeing."
}
},
"required": [
"boxes",
"from_format",
"to_format"
],
"type": "object"
}