HandProcessor
Hand processor
Hand processor estimates 21 2D and 3D hand keypoints, it locates the hand region-of-interest (ROI) and predicts the pose keypoints providing smooth, stable and accurate pose estimation fot the hand. 2D pixel hand keypoints - points in the screen coordinate space. X and Y coordinates are normalized screen coordinates (scaled by width and height of the input image), while the Z coordinate is depth within orthographic projection space, it has the same scale as X coordinate (normalized by image width). 2D points can be used for 2D overlays, math analyzes, or when using orthographic camera. 3D metric points - points within 3D space of perspective camera located at the space origin and pointed in the negative direction of the Z-axis. These points can be used for 3D model overlays or virtual try-on. Rigged and skinned models can be rendered on top of the pose aligning skeleton/armature joints with 3D keypoints. 3D and 2D points are perfectly aligned, projections of 3D points coincide with 2D pixel coordinates within the perspective camera. Additionally hand processor detects wrist 2D position and direction. Wrist detection provides 3 lines in the screen coordinate space. Middle line defines 2D wrist base/center point and unit direction vector of the wrist. Two more lines define wrist edges by 2D screen points at the end of the wrist along transversal section through the base point and associated direction vectors. Wrist detection provides for virtual try-on of accessories like watches and bands.
Extends
Section titled “Extends”Constructors
Section titled “Constructors”Constructor
Section titled “Constructor”new HandProcessor():
HandProcessor
Constructor
Returns
Section titled “Returns”HandProcessor
Inherited from
Section titled “Inherited from”Properties
Section titled “Properties”cameraAngle
Section titled “cameraAngle”cameraAngle:
number
Camera vertical angle in radians
Inherited from
Section titled “Inherited from”cameraAngleBase
Section titled “cameraAngleBase”
readonlycameraAngleBase:number
View angle of perspective camera along smallest side
cameraRatio
Section titled “cameraRatio”cameraRatio:
number
Camera aspect ratio
Inherited from
Section titled “Inherited from”optimalSize
Section titled “optimalSize”optimalSize:
number
Recommended maximum size of input
Inherited from
Section titled “Inherited from”params
Section titled “params”
protectedparams:Partial<HandParams>
Processor parameters
Inherited from
Section titled “Inherited from”videoRatio
Section titled “videoRatio”
protectedvideoRatio:number
Aspect ratio of input video
Inherited from
Section titled “Inherited from”videoSize
Section titled “videoSize”
protectedvideoSize:Size
Resolution of input video
Inherited from
Section titled “Inherited from”Methods
Section titled “Methods”addListener()
Section titled “addListener()”addListener<
E>(event,listener):this
Adds the listener function to the end of the listeners array
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
listener
Section titled “listener”ProcessorEvents[E]
The callback function
Returns
Section titled “Returns”this
This EventEmitter
Inherited from
Section titled “Inherited from”dispose()
Section titled “dispose()”dispose():
void
Dispose processor object
Releases resources and instances allocated by processor. Processor object cannot be used after calling dispose().
Returns
Section titled “Returns”void
Overrides
Section titled “Overrides”emit()
Section titled “emit()”emit<
E>(event, …args):boolean
Synchronously calls each of the listeners registered for the event
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
…Args<ProcessorEvents[E]>
Arguments passed to the listeners
Returns
Section titled “Returns”boolean
True if the event had listeners, False otherwise
Inherited from
Section titled “Inherited from”eventNames()
Section titled “eventNames()”eventNames(): (
string|symbol)[]
List of emitter’s events
Returns
Section titled “Returns”(string | symbol)[]
List of emitter’s events
Inherited from
Section titled “Inherited from”getMaxListeners()
Section titled “getMaxListeners()”getMaxListeners():
number
Maximum number of listeners per event
Returns
Section titled “Returns”number
Maximum number of listeners per event
Inherited from
Section titled “Inherited from”init()
Section titled “init()”init(
params,size?,ratio?):Promise<boolean>
Initialize processor
Prepares all resources required for pose estimation.
Parameters
Section titled “Parameters”params
Section titled “params”Processor parameters
Resolution of input video
ratio?
Section titled “ratio?”number
Aspect ration of input video
Returns
Section titled “Returns”Promise<boolean>
Status of initialization
Overrides
Section titled “Overrides”listenerCount()
Section titled “listenerCount()”listenerCount<
E>(event):number
The number of listeners listening to the event
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
Returns
Section titled “Returns”number
Number of listeners
Inherited from
Section titled “Inherited from”listeners()
Section titled “listeners()”listeners<
E>(event):Function[]
Copy of the array of listeners for the event
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
Returns
Section titled “Returns”Function[]
Copy of the listeners array
Inherited from
Section titled “Inherited from”off<
E>(event,listener):this
Removes the listener from the listener array for the event
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
listener
Section titled “listener”ProcessorEvents[E]
The callback function
Returns
Section titled “Returns”this
This EventEmitter
Inherited from
Section titled “Inherited from”on<
E>(event,listener):this
Adds the listener function to the event
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
listener
Section titled “listener”ProcessorEvents[E]
The callback function
Returns
Section titled “Returns”this
This EventEmitter
Inherited from
Section titled “Inherited from”once()
Section titled “once()”once<
E>(event,listener):this
Adds a one-time listener function for the event
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
listener
Section titled “listener”ProcessorEvents[E]
The callback function
Returns
Section titled “Returns”this
This EventEmitter
Inherited from
Section titled “Inherited from”prependListener()
Section titled “prependListener()”prependListener<
E>(event,listener):this
Adds the listener function to the beginning of the listeners array
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
listener
Section titled “listener”ProcessorEvents[E]
The callback function
Returns
Section titled “Returns”this
This EventEmitter
Inherited from
Section titled “Inherited from”prependOnceListener()
Section titled “prependOnceListener()”prependOnceListener<
E>(event,listener):this
Adds a one-time listener function to the beginning of the listeners array
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
listener
Section titled “listener”ProcessorEvents[E]
The callback function
Returns
Section titled “Returns”this
Inherited from
Section titled “Inherited from”process()
Section titled “process()”process(
input,timestamp?):Promise<HandResult>
Process the image
Hand processor detects hand and predicts keypoints.
Parameters
Section titled “Parameters”Image
timestamp?
Section titled “timestamp?”number
Image timestamp
Returns
Section titled “Returns”Promise<HandResult>
Hand pose detections
Overrides
Section titled “Overrides”rawListeners()
Section titled “rawListeners()”rawListeners<
E>(event):Function[]
Copy of the array of listeners for the event including wrappers
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
Returns
Section titled “Returns”Function[]
Copy of the listeners array
Inherited from
Section titled “Inherited from”removeAllListeners()
Section titled “removeAllListeners()”removeAllListeners<
E>(event?):this
Removes all listeners, or those of the specified event
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”event?
Section titled “event?”E
The name of the event
Returns
Section titled “Returns”this
This EventEmitter
Inherited from
Section titled “Inherited from”removeListener()
Section titled “removeListener()”removeListener<
E>(event,listener):this
Removes the specified listener from the listener array
Type Parameters
Section titled “Type Parameters”E extends keyof ProcessorEvents
Parameters
Section titled “Parameters”E
The name of the event
listener
Section titled “listener”ProcessorEvents[E]
The callback function
Returns
Section titled “Returns”this
This EventEmitter
Inherited from
Section titled “Inherited from”reset()
Section titled “reset()”reset():
void
Reset processor
Resets all processing instances to the initial state.
Returns
Section titled “Returns”void
Overrides
Section titled “Overrides”setMaxListeners()
Section titled “setMaxListeners()”setMaxListeners(
n):this
Sets maximum number of listeners per event
Parameters
Section titled “Parameters”number
Maximum number of listeners
Returns
Section titled “Returns”this
This EventEmitter
Inherited from
Section titled “Inherited from”setupVideo()
Section titled “setupVideo()”setupVideo(
size,ratio?):void
Set resolution of the input video
Defines view angle according to resolution and aspect ratio. Hand processor fixes FoV for more accurate hand alignment.
Parameters
Section titled “Parameters”Resolution of input video
ratio?
Section titled “ratio?”number
Aspect ration of input video
Returns
Section titled “Returns”void