Liveness Session Operations - Create Liveness Session

Reference

Service:: Azure AI Services

API Version:: v1.2

Create a new detect liveness session.
A session is best for client device scenarios where developers want to authorize a client device to perform only a liveness detection without granting full access to their resource. Created sessions have a limited life span and only authorize clients to perform the desired action before access is expired.

Permissions includes...

- Ability to call /detectLiveness/singleModal for up to 3 retries.
- A token lifetime of 10 minutes.

Note

Client access can be revoked by deleting the session using the Delete Liveness Session operation. To retrieve a result, use the Get Liveness Session. To audit the individual requests that a client has made to your resource, use the List Liveness Session Audit Entries.

POST {endpoint}/face/{apiVersion}/detectLiveness-sessions

URI Parameters

Name	In	Required	Type	Description
apiVersion	path	True	string	API Version
endpoint	path	True	string uri	Supported Cognitive Services endpoints (protocol and hostname, for example: https://{resource-name}.cognitiveservices.azure.com).

Request Body

Name	Required	Type	Description
livenessOperationMode	True	LivenessOperationMode	Type of liveness mode the client should follow.
authTokenTimeToLiveInSeconds		integer	Seconds the session should last for. Range is 60 to 86400 seconds. Default value is 600.
deviceCorrelationId		string	Unique Guid per each end-user device. This is to provide rate limiting and anti-hammering. If 'deviceCorrelationIdSetInClient' is true in this request, this 'deviceCorrelationId' must be null.
deviceCorrelationIdSetInClient		boolean	Whether or not to allow client to set their own 'deviceCorrelationId' via the Vision SDK. Default is false, and 'deviceCorrelationId' must be set in this request body.
enableSessionImage		boolean	Whether or not store the session image.
livenessModelVersion		LivenessModel	The model version used for liveness classification. This is an optional parameter, and if this is not specified, then the latest supported model version will be chosen

Responses

Name	Type	Description
200 OK	LivenessSession	A successful call create a session for a client device and provide an authorization token for use by the client application for a limited purpose and time.
Other Status Codes	FaceErrorResponse	An unexpected error response. Headers x-ms-error-code: string

Name

Type

Description

200 OK

LivenessSession

A successful call create a session for a client device and provide an authorization token for use by the client application for a limited purpose and time.

Other Status Codes

FaceErrorResponse

An unexpected error response.

Headers

x-ms-error-code: string

Security

Ocp-Apim-Subscription-Key

The secret key for your Azure AI Face subscription.

Type: apiKey
In: header

AADToken

The Azure Active Directory OAuth2 Flow

Type: oauth2
Flow: accessCode
Authorization URL: https://api.example.com/oauth2/authorize
Token URL: https://api.example.com/oauth2/token

Scopes

Name	Description
https://cognitiveservices.azure.com/.default

Examples

Create Liveness Session

Sample request

HTTP

POST {endpoint}/face/v1.2/detectLiveness-sessions

{
  "livenessOperationMode": "Passive",
  "deviceCorrelationIdSetInClient": false,
  "deviceCorrelationId": "your_device_correlation_id",
  "authTokenTimeToLiveInSeconds": 60
}

Sample response

Status code:: 200

{
  "sessionId": "b12e033e-bda7-4b83-a211-e721c661f30e",
  "authToken": "eyJhbGciOiJFUzI1NiIsIm",
  "status": "NotStarted",
  "modelVersion": "2024-11-15",
  "results": {
    "attempts": []
  }
}

Definitions

Name	Description
CreateLivenessSessionContent	Request model for creating liveness session.
FaceError	The error object. For comprehensive details on error codes and messages returned by the Face Service, please refer to the following link: https://aka.ms/face-error-codes-and-messages.
FaceErrorResponse	A response containing error details.
FaceRectangle	A rectangle within which a face can be found.
LivenessColorDecisionTarget	The target from color image used for liveness classification.
LivenessDecision	The outcome of the liveness classification.
LivenessDecisionTargets	The targets used for liveness classification.
LivenessError	The error of the liveness classification.
LivenessModel	The model version used for liveness classification.
LivenessOperationMode	The liveness operation mode to drive the client's end-user experience.
LivenessResult	The results of the liveness classification.
LivenessSession	Session result of detect liveness.
LivenessSessionAttempt	The liveness session attempt.
LivenessSessionResults	The results of the liveness session.
OperationState	The current status of the session.

CreateLivenessSessionContent

Request model for creating liveness session.

Name	Type	Default value	Description
authTokenTimeToLiveInSeconds	integer	600	Seconds the session should last for. Range is 60 to 86400 seconds. Default value is 600.
deviceCorrelationId	string		Unique Guid per each end-user device. This is to provide rate limiting and anti-hammering. If 'deviceCorrelationIdSetInClient' is true in this request, this 'deviceCorrelationId' must be null.
deviceCorrelationIdSetInClient	boolean		Whether or not to allow client to set their own 'deviceCorrelationId' via the Vision SDK. Default is false, and 'deviceCorrelationId' must be set in this request body.
enableSessionImage	boolean		Whether or not store the session image.
livenessModelVersion	LivenessModel		The model version used for liveness classification. This is an optional parameter, and if this is not specified, then the latest supported model version will be chosen
livenessOperationMode	LivenessOperationMode		Type of liveness mode the client should follow.

FaceError

The error object. For comprehensive details on error codes and messages returned by the Face Service, please refer to the following link: https://aka.ms/face-error-codes-and-messages.

Name	Type	Description
code	string	One of a server-defined set of error codes.
message	string	A human-readable representation of the error.

FaceErrorResponse

A response containing error details.

Name	Type	Description
error	FaceError	The error object.

FaceRectangle

A rectangle within which a face can be found.

Name	Type	Description
height	integer	The height of the rectangle, in pixels.
left	integer	The distance from the left edge if the image to the left edge of the rectangle, in pixels.
top	integer	The distance from the top edge if the image to the top edge of the rectangle, in pixels.
width	integer	The width of the rectangle, in pixels.

LivenessColorDecisionTarget

The target from color image used for liveness classification.

Name	Type	Description
faceRectangle	FaceRectangle	The face region where the liveness classification was made on.

LivenessDecision

The outcome of the liveness classification.

Name	Type	Description
realface	string	The algorithm has classified the target face as real.
spoofface	string	The algorithm has classified the target face as a spoof.
uncertain	string	The algorithm could not classify the target face as either real or spoof.

LivenessDecisionTargets

The targets used for liveness classification.

Name	Type	Description
color	LivenessColorDecisionTarget	The target from color image used for liveness classification.

LivenessError

The error of the liveness classification.

Name	Type	Description
code	string	The error code.
message	string	The error message.
targets	LivenessDecisionTargets	Targets used for liveness classification.

LivenessModel

The model version used for liveness classification.

Name	Type	Description
2024-11-15	string

LivenessOperationMode

The liveness operation mode to drive the client's end-user experience.

Name	Type	Description
Passive	string	Utilizes a passive liveness technique that requires no additional actions from the user. Requires normal indoor lighting and high screen brightness for optimal performance. And thus, this mode has a narrow operational envelope and will not be suitable for scenarios that requires the end-user's to be in bright lighting conditions. Note: this is the only supported mode for the Mobile (iOS and Android) solution.
PassiveActive	string	This mode utilizes a hybrid passive or active liveness technique that necessitates user cooperation. It is optimized to require active motion only under suboptimal lighting conditions. Unlike the passive mode, this mode has no lighting restrictions, and thus offering a broader operational envelope. This mode is preferable on Web based solutions due to the lack of automatic screen brightness control available on browsers which hinders the Passive mode's operational envelope on Web based solutions.

LivenessResult

The results of the liveness classification.

Name	Type	Description
digest	string	The server calculated digest for this request. If the client reported digest differs from the server calculated digest, then the message integrity between the client and service has been compromised and the result should not be trusted. For more information, see how to guides on how to leverage this value to secure your end-to-end solution.
livenessDecision	LivenessDecision	The liveness classification for the target face.
sessionImageId	string	The image ID of the session request.
targets	LivenessDecisionTargets	Targets used for liveness classification.