LabelMore Essentials

The Essentials plugin package provides the necessary tools to start up the LabelMore Annotation Tool.

Note: The Essentials is a core package and cannot be removed from the tool.

What's New

• Added Keypoint Annotation Support

Contents

• Encoders
  • JSON Encoder
• Label Types
  • Bounding Box
  • Contour Label
  • Polyline Label
• Panels
• Sources
• Tools
• Wizards
• Settings

---

Encoders

These are used to export the annotation project into a target format

JSON Encoder

Exports the annotation in a JSON format. The JSON encoder by default doesn't contain any export formats. Format for each label type can be registered using the registerFormat method of the encoder.

Note: The format registered must be a proper COCO JSON format.

The format must contain the following informations:

• name String : name of the annotation label
• description Object : any extra information related to the annotation
• classTitle String : name of the annotation class. E.g. Car, Pedestrian etc.
• attributes Object : label attributes E.g. Occluded, Truncated etc.
• points Object : spacial information of the annotation (co-ordinate points)

JSON Format Example

{
    "name": "Car_1562909220502",
    "description": {
        "type": "types.default.bndbox"
    },
    "classTitle": "Car",
    "attributes": {},
    "points": {
        "exterior": [
            [
                220.71155595996362,
                242.18926296633305
            ],
            [
                326.2729754322112,
                312.9262966333031
            ]
        ],
        "interior": []
    }
}

Registering a JSON Format

A new format is registered to JSON Encoder by using an EncoderFormat object. An EncoderFormat object is a javascript object with an encode method.

A common method to create a format is to:

1. Create a format class implementing the encode method.
2. Create an instance of the class and register it to JSON encoder.

Example: Registering bounding box format

boundbox.json.format.ts

export class BoundboxJsonFormat {

    constructor(private labeller: LabelManager) {}

    /**
     * @param label - label to encode
     * @param class_ - class of the label
     */
    encode(label: Label<BoundboxProps>, class_: LabelClass) {

        /*
        * return a js object defining the json export format for boundbox label
        */
        return {
            name: this.labeller.getName(label),
            description: {
                type: label.type
            },
            classTitle: class_.name,
            attributes: label.attributes || {},
            points: {
                exterior: [[label.props.xmin, label.props.ymin], [label.props.xmax, label.props.ymax]],
                interior: []
            }

        }
    }
}

boundbox.label.ts

// import BoundboxJsonFormat from boundbox.json.format.ts

export class BoundboxLabel extends SimpleLabelType<BoundboxProps> {

    // ....
    constructor(projectManager: ProjectManager, /*...other dependencies*/) {

        //...

        if (projectManager.hasEncoder('encoders.default.json')) {

            const jsonEnc = <JsonEncoder>projectManager.getEncoder('encoders.default.json')

            if (!jsonEnc.hasFormat(DEFAULT_LABEL_TYPES.boundbox)) {

                jsonEnc.registerFormat(DEFAULT_LABEL_TYPES.boundbox, new BoundboxJsonFormat(labeller))

                // DEFAULT_LABEL_TYPES.boundbox is constant giving the registered name of default bounding box label type
                // this should be replaced with the registered name of the label type for which the format is registered
            }
        }

        //...
    }
}

Label Types

The Essentials package contains BoundingBox, Contour and Polyline labels.

Bounding Box Label

The default bounding box label, implements the BoundboxProps. Represents a rectangular bounding box.

To draw a boundbox label into workspace:

• The type should be set as types.default.bndbox (Note: The type name of default boundbox can be accessed using the constant DEFAULT_LABEL_TYPES.boundbox)
• The props should have:
  • xmin Number : X co-ordinate of top left point
  • ymin Number : Y co-ordinate of top left point
  • xmax Number : X co-ordinate of bottom right point
  • ymax Number : Y co-ordinate of bottom right point

Example : Adding a bounding box label to workspace

// adding boundbox label
// code block from the boundbox tool

this.labeller.add({
    type: DEFAULT_LABEL_TYPES.boundbox,
    props: {
        xmin: this.preview.bounds.left,
        ymin: this.preview.bounds.top,
        xmax: this.preview.bounds.right,
        ymax: this.preview.bounds.bottom
    }
})

Contour Label

The default contour or polygon label, implements the ContourProps. Represents a closed polygon shape.

To draw a contour label into workspace:

• The type should be set as types.default.contour (Note: The type name of default contour can be accessed using the constant DEFAULT_LABEL_TYPES.contour)
• The props should have:
  • points Array : Array of co-ordinate points

Example : Adding a contour label to workspace

// adding contour label
// code block from the contour tool

this.labeller.add({
    type: DEFAULT_LABEL_TYPES.contour,
    props: {
        points: this.points.map(p => ({x: p.x, y: p.y}))
    }
})

Polyline Label

The default polyline label, implements the PolylineProps. Represents an open polyline shape.

To draw a polyline label into workspace:

• The type should be set as types.default.line (Note: The type name of default polyline can be accessed using the constant DEFAULT_LABEL_TYPES.line)
• The props should have:
  • points Array : Array of co-ordinate points

Example : Adding a polyline label to workspace

// adding polyline label
// code block from line tool

this.labeller.add({
    type: DEFAULT_LABEL_TYPES.line,
    props: {
        points: this.points.map(p => ({x: p.x, y: p.y}))
    }
})

Keypoint Label

The default keypoint label. Represents a keypoint skeleton.

To draw a keypoint label into workspace:

• The type should be set as types.default.keypoint
• The props should have:
  • boundbox Object : props of a boundbox label
    • xmin Number : X co-ordinate of top left point
    • ymin Number : Y co-ordinate of top left point
    • xmax Number : X co-ordinate of bottom right point
    • ymax Number : Y co-ordinate of bottom right point
  • keypoints Array : An array of object each of the form:
    • name String : name of the keypoint
    • point Object: coordinate of the point
      • x Number: x co-ordinate of the point
      • y Number: y co-ordinate of the point

Panels

The Essentials package contains the necessary panels for selecting label class, keypoint, scene attributes and class attributes

Sources

The essentials package contains the disk source which allows projects to use the disk storage for input and output.

Tools

The essentials package contains tools for basic annotation.

It contains:

Tool	Default Shortcut
Select	A
Boundbox	R
Contour	C
Polyline	W
Keypoint	X
Pan	D

Note: Default shortcuts are set in the tool in-built and cannot be changed. Note: Shortcuts can be changed for each project

Select Tool

Used to select annotation labels.

Actions

Trigger	Interaction	Action
Left Mouse	Click	Select annotation
Delete Key	Press	Delete selected annotation
Up Arrow Key	Press	Bring selected annotation forward
Down Arrow Key	Press	Take selected annotation backward

Boundbox Tool

Used for creating box annotations.

Actions

Trigger	Interaction	Action
Left Mouse	Click & Drag	Create annotation

Contour Tool

Used for creating polygon/contour annotations.

Actions

Trigger	Interaction	Action
Left Mouse	Click	Add a point while drawing
''	Alt + Click	Remove point from selected annotation
''	Shift + Click	Add point to selected annotation
Backspace	Press	Backtrack last point while drawing
Alt	Press & Hold	Enable snapping mode while drawing
Tab	Press	Snap points of selected annotation to nearby annotations

Polyline Tool

Used for creating polyline annotations.

Actions

Trigger	Interaction	Action
Left Mouse	Click	Add a point while drawing
''	Alt + Click	Remove point from selected annotation
''	Shift + Click	Add point to selected annotation
Backspace	Press	Backtrack last point while drawing

Keypoint Tool

Used for creating keypoint annotations

Boundbox Mode

Boundbox mode is active during the start of annotation. This mode is deactivated once boundbox is drawn.

Actions

Trigger	Interaction	Action
Left Mouse	Click & Drag	Create bounding box

Keypoint Mode

This mode is activated once boundbox is drawn. You can start adding keypoints in this mode.

Trigger	Interaction	Action
Left Mouse	Click	Add keypoint (A keypoint need to be selected)
''	Alt + Click	Remove a keypoint from selected annotation
''	Shift + Click	Add an extra keypoint to selected annotation
Backspace	Press	Remove last added point (or boundbox)
V	Alt + Click	Toggle visibility mode

Note:

• on pressing backspace, if no keypoint is added, the boundbox is deleted and the tool is set to Boundbox Mode.
• The visibility mode can be accessed from the store dependency as: store.state.globals['tools.default.keypoint.visibility']
  • The value 2 equals to visible
  • The value 1 equals to invisible
• The boundbox mode and keypoint mode cannot be set manually

Pan Tool

The pan tool is used to scroll through the workspace area.

Trigger	Interaction	Action
Left Mouse	Click & Drag	Scroll through the workspace view

Wizards

The essential package includes a basic localization annotation project.

Settings

The essentials package comes with its own settings.

Tool Settings

1. Preview Color : Stroke color of tool preview
2. Preview Stroke Width : Stroke thickness of tool preview
3. Preview Dashed : Whether stroke of tool preview is to be dashed or not
4. Hotspots : Enable hotspot info for tool

Boundbox Tool

5. Minimum Area : Minimum area required to finalize a label creation

Contour Tool

6. Minimum Close Distance : Minimum distance needed to trigger the auto-close circle
7. Minimum Sides : Minimum sides needed for the polygon (minimum value is 3)
8. Snap to Point : Snap to the closest point on the workspace (Useful when working with semantic segmentations)
9. Minimum Snap Distance : Minimum distance needed between the points for them to snap together

Label Settings

Contour Label

10. Show Vertex Points : Make vertex points visible for contour label

Keypoint Label

11. Keypoint Radius : Radius of the keypoint label
12. Skeleton : Show skeleton of the keypoints or not