API for android call

[StellaSong12]

Hello, I'm glad for building successfully in android mobile.
Then I hope to get the position (x, y) that eye blow stare at, or the direction it move to.
Is there any existing API for android jni to call? Or is there any documents and suggestion for me to read?

Really appreciate for your reply!

[headupinclouds]

There is no high level gaze API, but you can monitor the low level 2D models from the eye tracking over time in the SDK callbacks for simple relative gaze measurements here:

drishti/src/lib/drishti/drishti/ut/test-FaceTracker.cpp

Lines 224 to 230 in b9cadae

	drishti_request_t trigger(const drishti_face_tracker_result_t& faces, double timestamp)
	{
	m_logger->info("trigger: Received results at time {}}", timestamp);
	// if(some_condition_is_true(faces)) {
	return { 3, true, true, true, true }; // request last 3 images and textures
	// }
	}

You can register that callback to monitor estimated face + eye models in real-time, and if you find something of interest, you can optionally return a structure requesting a buffer of textures and/or frames at that point in time (grabbing textures is free, but GPU->CPU transfers are slower and should be a once-in-a-while operation). If relative gaze estimates are sufficient for your application, you can estimate them using changes in the pupil or eye center positions wrt a stable reference coordinate system. If you need some absolute gaze estimate, you will probably have to train an application specific model with an image based CNN approach.

[StellaSong12]

Thank you a lot!
It really helps!