Spoof Detection

Active Spoof

Active spoof requires many steps and is an involved process. Therefore, please be sure to consult the sample code which comes shipped as part of the SDK bundle for a demonstration of proper usage.

SDK.check_spoof_image_face_size(self: tfsdk.SDK, face_box_and_landmarks: tfsdk.FaceBoxAndLandmarks, image_properties: tfsdk.ImageProperties, active_spoof_state: tfsdk.ACTIVESPOOFSTAGE) → tfsdk.ERRORCODE

Ensures that the face size meets the requirements for active spoof. Must check function return value! Active spoof works by analyzing the way a persons face changes as they move closer to a camera. The active spoof solution therefore expects the face a certain distance from the camera. In the far image, the face should be about 18 inches from the camera, while in the near image, the face should be 7-8 inches from the camera. This function must be called before calling tfsdk.SDK.detect_active_spoof().

Parameters

• face_box_and_landmarks - The face on which to run active spoof detection.

• image_properties - The properties of the image, obtained from tfsdk.SDK.get_image_properties().

• active_spoof_state - The stage of the image, either near stage or far stage.

Returns

The ERRORCODE. If ERRORCODE.NO_ERROR is returned, then the image is eligible for active spoof detection. If ERRORCODE.FACE_TOO_CLOSE or ERRORCODE.FACE_TOO_FAR is returned, the image is not eligible for active spoof detection.

SDK.detect_active_spoof(self: tfsdk.SDK, near_face_landmarks: List[tfsdk.Point[106]], far_face_landmarks: List[tfsdk.Point[106]]) → Tuple[tfsdk.ERRORCODE, float, tfsdk.SPOOFLABEL]

Detect if there is a presentation attack attempt. Must call tfsdk.SDK.check_spoof_image_size() on both input faces before calling this function.

Parameters

• near_face_landmarks - The face landmarks of the near face, obtained by calling tfsdk.SDK.get_face_landmarks().

• far_face_landmarks - The face landmarks of the far face, obtained by calling tfsdk.SDK.get_face_landmarks().

Returns

The ERRORCODE, the spoof score, and the tfsdk.SPOOFLABEL, in that order.

class tfsdk.ACTIVESPOOFSTAGE

Members:

NEAR : Near image

FAR : Far image

class tfsdk.SPOOFLABEL

Members:

FAKE : The image may be an attempted spoof

REAL : The face image is real

Passive Spoof

Warning

We are finding some limitations with a passive approach to spoof detection. Until we have an improved model we will mark this API method as deprecated. We will continue to support this implementation but want to make you aware that there will be an updated solution with different requirements.

Deprecated since version 0.17.

SDK.detect_spoof(self: tfsdk.SDK, face_box_and_landmarks: tfsdk.FaceBoxAndLandmarks, threshold: float = 0.5) → Tuple[tfsdk.ERRORCODE, tfsdk.SPOOFLABEL, float]

Detect if there is a spoof attempt. Returns the spoof score.

Parameters

• face_box_and_landmarks – tfsdk.FaceBoxAndLandmarks returned by tfsdk.SDK.detect_faces() or tfsdk.SDK.detect_largest_face().

• threshold – the spoof score threshold above which it is considered a spoof attempt (default = 0.5).

Returns

The ERRORCODE, the tfsdk.SPOOFLABEL, and the spoof score, in that order.