Scale Image Layers

“Layers” can be used to specify read-only boxes, lines, polygons, and/or cuboids to be pre-drawn on an image.

For instance, you can specify boxes around the cars of an image and instruct workers to only draw polygons around the currently boxed cars. Alternatively, you could instruct workers to only draw polygons around cars which don't already have boxes around them.

Layers are specified using a Layers object, which has the following keys:

• boxes (optional): an array of box objects
• lines (optional): an array of line objects
• cuboids (optional): an array of cuboid objects
• polygons (optional): an array of polygon objects
  Each of these objects is specified in the same format as the responses for their respective endpoints.

Layers for Image Annotation

To specify layers for imageannotation and categorization (if the attachment_type is image) tasks, pass a Layers object using the optional layers parameter in the request.

{
  ...
  "attachment": "https://i.imgur.com/iDZcXfS.png",
  "layers": {
    "boxes": [{ ... }],
    "lines": [{ ... }],
    "cuboids": [{ ... }],
    "polygons": [{ ... }]
  }
}

Layers for Video Annotation

To specify layers for videoannotation tasks, pass a Scale-accessible file containing an array of Layers objects (one for each frame of the video) using the optional layers.url parameter in the request. See https://scale-static-assets.s3.us-west-2.amazonaws.com/uploads/videoLayers.json for an example file corresponding to a video with two frames.

{
  ...
  "attachments": ["https://i.imgur.com/iDZcXfS.png"],
  "layers": {
    "url": "https://scale-static-assets.s3.us-west-2.amazonaws.com/uploads/videoLayers.json"
  ...
}