5. Camera

To use ARGear, you must provide camera configuration information and video frames to ARGear. Based on that information, ARGear applies AR functions such as face tracking, segmentation, etc. on top of the received frames as configured in ARGInferenceConfig.Feature.
The sample code below describes an example of camera configuration and how to feed video frames to ARGear.
Java
Kotlin
Java
ReferenceCamera.CameraListener cameraListener = new ReferenceCamera.CameraListener() {
    @Override
    public void setConfig(int previewWidth, 
                                      int previewHeight, 
                                      float verticalFov, 
                                      float horizontalFov, 
                                      int orientation, 
                                      boolean isFrontFacing, 
                                      float fps) {
        argsession.setCameraConfig(new ARGCameraConfig(previewWidth,
                previewHeight,
                verticalFov,
                horizontalFov,
                orientation,
                isFrontFacing,
                fps));
    }
​
    // region - for camera api 1
    @Override
    public void updateFaceRects(Camera.Face[] faces) {
        // Send face related information from camera to ARGear
        argsession.updateFaceRects(faces);
    }
​
    @Override
    public void feedRawData(byte[] data) {
        // Send preview frame raw data from camera device to ARGear
        argsession.feedRawData(data);
    }
    // endregion
​
    // region - for camera api 2
    @Override
    public void updateFaceRects(int numFaces, int[][] bbox) {
        // Send face related information from camera to ARGear
        argsession.updateFaceRects(numFaces, bbox);
    }
​
    @Override
    public void feedRawData(Image data) {
        // Send preview frame image from camera device to ARGear
        argsession.feedRawData(data);
    }
    // endregion
};
Kotlin
private var cameraListener: ReferenceCamera.CameraListener = object : ReferenceCamera.CameraListener {
    override fun setConfig(
        previewWidth: Int,
        previewHeight: Int,
        verticalFov: Float,
        horizontalFov: Float,
        orientation: Int,
        isFrontFacing: Boolean,
        fps: Float
    ) {
        argsession.setCameraConfig(
            ARGCameraConfig(
                previewWidth,
                previewHeight,
                verticalFov,
                horizontalFov,
                orientation,
                isFrontFacing,
                fps
            )
        )
    }
​
    // region - for camera api 1
    override fun updateFaceRects(faces: Array<Camera.Face>?) {
        argsession.updateFaceRects(faces)
    }
​
    override fun feedRawData(data: ByteArray?) {
        argsession.feedRawData(data)
    }
    // endregion
​
    // region - for camera api 2
    override fun updateFaceRects(numFaces: Int, bbox: Array<IntArray>?) {
        argsession.updateFaceRects(numFaces, bbox)
    }
​
    override fun feedRawData(data: Image?) {
        argsession.feedRawData(data)
    } 
   // endregion
}
Sample code of a camera class that calls updateFaceRects and feedRawData functions is written below.
Camera API 1 Sample Code
Java
Kotlin
Java
<Camera API 1 Sample Code>
private class FaceDetecionCallBack implements FaceDetectionListener {
    @Override
    public void onFaceDetection(Face[] faces, Camera camera) {
        listener.updateFaceRects(faces);
    }
}
​
private class CameraPreviewCallback implements Camera.PreviewCallback {
    @Override
    public void onPreviewFrame(byte[] data, Camera camera) {
        listener.feedRawData(data.array());
    }
}
Kotlin
private inner class FaceDetecionCallBack :
    FaceDetectionListener {
    override fun onFaceDetection(
        faces: Array<Face>,
        camera: Camera
    ) { 
        listener?.updateFaceRects(faces)
    }
}
​
private inner class CameraPreviewCallback : PreviewCallback {
    override fun onPreviewFrame(
        data: ByteArray,
        camera: Camera
    ) {
        listener?.feedRawData(data?.array())
    }
}
​
Camera API 2 Sample Code
Java
Kotlin
Java
<Camera API 2 Sample Code>
private CameraCaptureSession.CaptureCallback mCaptureCallback
        = new CameraCaptureSession.CaptureCallback() {
    private void process(CaptureResult result) {
        Integer mode = result.get(CaptureResult.STATISTICS_FACE_DETECT_MODE);
        Face[] faces = result.get(CaptureResult.STATISTICS_FACES);
        if(faces != null && mode != null) {
            if (faces.length > 0) {
                int[][] bbox = new int[MAXFACE][4];
                Rect rect;
                for (int i = 0; i < faces.length; ++i) {
                    rect = faces[i].getBounds();
                    bbox[i][0] = rect.left*mPreviewSize[0]/mCameraSensorResolution.getWidth();
                    bbox[i][1] = rect.top*mPreviewSize[1]/mCameraSensorResolution.getHeight();
                    bbox[i][2] = rect.right*mPreviewSize[0]/mCameraSensorResolution.getWidth();
                    bbox[i][3] = rect.bottom*mPreviewSize[1]/mCameraSensorResolution.getHeight();
                }
                listener.updateFaceRects(faces.length, bbox);
            }
        }
    }
​
    @Override
    public void onCaptureProgressed(CameraCaptureSession session,
                                    CaptureRequest request,
                                    CaptureResult partialResult) {
        process(partialResult);
    }
​
    @Override
    public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                   @NonNull CaptureRequest request,
                                   @NonNull TotalCaptureResult result) {
        process(result);
    }
};
​
​
private final ImageReader.OnImageAvailableListener mOnImageAvailableListener
    = new ImageReader.OnImageAvailableListener() {
    @Override
    public void onImageAvailable(final ImageReader reader) {
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                final Image image = reader.acquireLatestImage();
                if (image != null) {
                    listener.feedRawData(image);
                    image.close();
                }
            }
        });
    }
};
Kotlin
private val mCaptureCallback: CaptureCallback = object : CaptureCallback() {
    private fun process(result: CaptureResult) {
        val mode = result.get(CaptureResult.STATISTICS_FACE_DETECT_MODE)
        val faces =
            result.get(
                CaptureResult.STATISTICS_FACES
            )
        if (faces != null && mode != null) {
            if (faces.isNotEmpty()) {
                //Log.e(TAG, "face detected = " + faces.length);
                val bbox = Array(faces.size) { IntArray(4) }
                var rect: Rect
                for (i in faces.indices) {
                    rect = faces[i].bounds
                    bbox[i][0] = rect.left * previewSize[0] / cameraSensorResolution!!.width
                    bbox[i][1] = rect.top * previewSize[1] / cameraSensorResolution!!.height
                    bbox[i][2] = rect.right * previewSize[0] / cameraSensorResolution!!.width
                    bbox[i][3] = rect.bottom * previewSize[1] / cameraSensorResolution!!.height
                }
                listener.updateFaceRects(faces.size, bbox)
            }
        }
    }
​
    override fun onCaptureProgressed(
        session: CameraCaptureSession,
        request: CaptureRequest,
        partialResult: CaptureResult
    ) {
        process(partialResult)
    }
​
    override fun onCaptureCompleted(
        session: CameraCaptureSession,
        request: CaptureRequest,
        result: TotalCaptureResult
    ) {
        process(result)
    }
}
​
​
private val mOnImageAvailableListener =
    OnImageAvailableListener { reader ->
        handler?.post {
            val image = reader.acquireLatestImage()
            if (image != null) {
                listener.feedRawData(image)
                image.close()
            }
        }
    }
​
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4. ARGSession
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6. Rendering
Last updated 9 months ago