{"id":5564,"date":"2020-01-24T14:43:35","date_gmt":"2020-01-24T09:13:35","guid":{"rendered":"https:\/\/www.innovationm.com\/blog\/?p=5564"},"modified":"2026-01-14T11:47:38","modified_gmt":"2026-01-14T06:17:38","slug":"capture-image-on-eye-blink","status":"publish","type":"post","link":"https:\/\/www.innovationm.com\/blog\/capture-image-on-eye-blink\/","title":{"rendered":"Capture Image on Eye Blink"},"content":{"rendered":"

The Mobile Vision AP<\/strong>I provides a framework for recognizing objects in photos and videos. The framework includes\u00a0detectors<\/b>, which locate and describe visual objects in images or video frames, and an event-driven API<\/strong> that tracks the position of those objects in video.<\/p>\n

The objects that can be tracked by Mobile Vision API<\/strong> include facial features, text and bar codes.<\/p>\n

For our purpose, we will be doing real-time tracking of face objects using a custom camera. So let’s get started.<\/p>\n

First, create a new project and add the following dependencies in your app level build.gradle<\/strong> file which is available at location:\u00a0app\/build.gradle<\/strong>.<\/p>\n

dependencies {\r\n    \/*... other dependencies ...*\/\r\n    implementation 'com.google.android.gms:play-services-vision:17.0.2'\r\n}<\/pre>\n
Now open strings.xml<\/strong> file at location res\/values\/strings.xml<\/strong> and add the following in it.<\/p>\n
<string name=\"take_photo\">Blink your eyes to capture photo<\/string>\r\n<string name=\"permission_required\">Permission Required<\/string>\r\n<string name=\"permission_message\">You must grant permission to access camera to run this application.<\/string>\r\n<string name=\"permission_warning\">All permissions are required.<\/string><\/pre>\n
Now let’s build our layout file. So open activity_main.xml<\/strong> file and add the below code.<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<FrameLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n    android:layout_width=\"match_parent\"\r\n    android:layout_height=\"match_parent\"\r\n    android:orientation=\"vertical\">\r\n\r\n    <SurfaceView\r\n        android:id=\"@+id\/surfaceView\"\r\n        android:layout_width=\"match_parent\"\r\n        android:layout_height=\"match_parent\"\r\n        android:visibility=\"gone\" \/>\r\n\r\n    <TextView\r\n        android:id=\"@+id\/tv_capture\"\r\n        android:layout_width=\"wrap_content\"\r\n        android:layout_height=\"wrap_content\"\r\n        android:layout_gravity=\"center_horizontal|bottom\"\r\n        android:background=\"#8cffffff\"\r\n        android:padding=\"20dp\"\r\n        android:text=\"@string\/take_photo\"\r\n        android:textStyle=\"bold\"\r\n        android:visibility=\"gone\" \/>\r\n<\/FrameLayout><\/pre>\n
Here SurfaceView is used for the camera instance that we will be creating in the latter part of this post.<\/p>\n
Now in the MainActivity.java<\/strong>, add the below code<\/p>\n
package com.test.camerademo.ui;\r\n\r\nimport android.Manifest;\r\nimport android.app.AlertDialog;\r\nimport android.content.DialogInterface;\r\nimport android.content.Intent;\r\nimport android.content.pm.PackageManager;\r\nimport android.graphics.Bitmap;\r\nimport android.graphics.BitmapFactory;\r\nimport android.os.Bundle;\r\nimport android.os.Handler;\r\nimport android.os.Looper;\r\nimport android.support.annotation.NonNull;\r\nimport android.support.v4.app.ActivityCompat;\r\nimport android.support.v4.content.ContextCompat;\r\nimport android.support.v7.app.AppCompatActivity;\r\nimport android.util.Log;\r\nimport android.view.SurfaceHolder;\r\nimport android.view.SurfaceView;\r\nimport android.view.View;\r\nimport android.widget.Toast;\r\n\r\nimport com.google.android.gms.vision.CameraSource;\r\nimport com.google.android.gms.vision.face.FaceDetector;\r\nimport com.google.android.gms.vision.face.LargestFaceFocusingProcessor;\r\nimport com.test.camerademo.R;\r\n\r\nimport java.io.IOException;\r\nimport java.util.ArrayList;\r\n\r\nimport static android.Manifest.permission.CAMERA;\r\n\r\npublic class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback, CameraSource.PictureCallback {\r\n\r\n    public static final int CAMERA_REQUEST = 101;\r\n    public static Bitmap bitmap;\r\n    private SurfaceHolder surfaceHolder;\r\n    private SurfaceView surfaceView;\r\n    private String[] neededPermissions = new String[]{CAMERA};\r\n    private FaceDetector detector;\r\n    private CameraSource cameraSource;\r\n\r\n    @Override\r\n    protected void onCreate(Bundle savedInstanceState) {\r\n        super.onCreate(savedInstanceState);\r\n        setContentView(R.layout.activity_main);\r\n\r\n        surfaceView = findViewById(R.id.surfaceView);\r\n\r\n        detector = new FaceDetector.Builder(this)\r\n                .setProminentFaceOnly(true) \/\/ optimize for single, relatively large face\r\n                .setTrackingEnabled(true) \/\/ enable face tracking\r\n                .setClassificationType(\/* eyes open and smile *\/ FaceDetector.ALL_CLASSIFICATIONS)\r\n                .setMode(FaceDetector.FAST_MODE) \/\/ for one face this is OK\r\n                .build();\r\n\r\n        if (!detector.isOperational()) {\r\n            Log.w(\"MainActivity\", \"Detector Dependencies are not yet available\");\r\n        } else {\r\n            Log.w(\"MainActivity\", \"Detector Dependencies are available\");\r\n            if (surfaceView != null) {\r\n                boolean result = checkPermission();\r\n                if (result) {\r\n                    setViewVisibility(R.id.tv_capture);\r\n                    setViewVisibility(R.id.surfaceView);\r\n                    setupSurfaceHolder();\r\n                }\r\n            }\r\n        }\r\n    }\r\n\r\n    private boolean checkPermission() {\r\n        ArrayList<String> permissionsNotGranted = new ArrayList<>();\r\n        for (String permission : neededPermissions) {\r\n            if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {\r\n                permissionsNotGranted.add(permission);\r\n            }\r\n        }\r\n        if (!permissionsNotGranted.isEmpty()) {\r\n            boolean shouldShowAlert = false;\r\n            for (String permission : permissionsNotGranted) {\r\n                shouldShowAlert = ActivityCompat.shouldShowRequestPermissionRationale(this, permission);\r\n            }\r\n            if (shouldShowAlert) {\r\n                showPermissionAlert(permissionsNotGranted.toArray(new String[permissionsNotGranted.size()]));\r\n            } else {\r\n                requestPermissions(permissionsNotGranted.toArray(new String[permissionsNotGranted.size()]));\r\n            }\r\n            return false;\r\n        }\r\n        return true;\r\n    }\r\n\r\n    private void showPermissionAlert(final String[] permissions) {\r\n        AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this);\r\n        alertBuilder.setCancelable(true);\r\n        alertBuilder.setTitle(R.string.permission_required);\r\n        alertBuilder.setMessage(R.string.permission_message);\r\n        alertBuilder.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {\r\n            public void onClick(DialogInterface dialog, int which) {\r\n                requestPermissions(permissions);\r\n            }\r\n        });\r\n        AlertDialog alert = alertBuilder.create();\r\n        alert.show();\r\n    }\r\n\r\n    private void requestPermissions(String[] permissions) {\r\n        ActivityCompat.requestPermissions(MainActivity.this, permissions, CAMERA_REQUEST);\r\n    }\r\n\r\n    @Override\r\n    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {\r\n        if (requestCode == CAMERA_REQUEST) {\r\n            for (int result : grantResults) {\r\n                if (result == PackageManager.PERMISSION_DENIED) {\r\n                    Toast.makeText(MainActivity.this, R.string.permission_warning, Toast.LENGTH_LONG).show();\r\n                    setViewVisibility(R.id.showPermissionMsg);\r\n                    checkPermission();\r\n                    return;\r\n                }\r\n            }\r\n            setViewVisibility(R.id.tv_capture);\r\n            setViewVisibility(R.id.surfaceView);\r\n            setupSurfaceHolder();\r\n        }\r\n        super.onRequestPermissionsResult(requestCode, permissions, grantResults);\r\n    }\r\n\r\n    private void setViewVisibility(int id) {\r\n        View view = findViewById(id);\r\n        if (view != null) {\r\n            view.setVisibility(View.VISIBLE);\r\n        }\r\n    }\r\n\r\n    private void setupSurfaceHolder() {\r\n        cameraSource = new CameraSource.Builder(this, detector)\r\n                .setFacing(CameraSource.CAMERA_FACING_FRONT)\r\n                .setRequestedFps(2.0f)\r\n                .setAutoFocusEnabled(true)\r\n                .build();\r\n\r\n        surfaceHolder = surfaceView.getHolder();\r\n        surfaceHolder.addCallback(this);\r\n    }\r\n\r\n    public void captureImage() {\r\n        \/\/ We add a delay of 200ms so that image captured is stable.\r\n        new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {\r\n            @Override\r\n            public void run() {\r\n                runOnUiThread(new Runnable() {\r\n                    @Override\r\n                    public void run() {\r\n                        clickImage();\r\n                    }\r\n                });\r\n            }\r\n        }, 200);\r\n    }\r\n\r\n    private void clickImage() {\r\n        if (cameraSource != null) {\r\n            cameraSource.takePicture(null, this);\r\n        }\r\n    }\r\n\r\n    @Override\r\n    public void surfaceCreated(SurfaceHolder surfaceHolder) {\r\n        startCamera();\r\n    }\r\n\r\n    private void startCamera() {\r\n        try {\r\n            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {\r\n                return;\r\n            }\r\n            cameraSource.start(surfaceHolder);\r\n            detector.setProcessor(new LargestFaceFocusingProcessor(detector,\r\n                    new GraphicFaceTracker(this)));\r\n        } catch (IOException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n\r\n    @Override\r\n    public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {\r\n    }\r\n\r\n    @Override\r\n    public void surfaceDestroyed(SurfaceHolder surfaceHolder) {\r\n        cameraSource.stop();\r\n    }\r\n\r\n    @Override\r\n    public void onPictureTaken(byte[] bytes) {\r\n        bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);\r\n        \/\/ Save or Display image as per your requirements. Here we display the image.\r\n        Intent intent = new Intent(this, PictureActivity.class);\r\n        startActivity(intent);\r\n    }    \r\n}<\/pre>\n
Here we create a custom Tracker, i.e, GraphicFaceTracker<\/strong> which tracks the facial features. We use this to track the blinking of the eyes.<\/p>\n
Below is the code for\u00a0GraphicFaceTracker.java.<\/strong><\/p>\n
package com.test.camerademo.ui;\r\n\r\nimport android.util.Log;\r\n\r\nimport com.google.android.gms.vision.Tracker;\r\nimport com.google.android.gms.vision.face.Face;\r\nimport com.google.android.gms.vision.face.FaceDetector;\r\n\r\npublic class GraphicFaceTracker extends Tracker<Face> {\r\n\r\n    private static final float OPEN_THRESHOLD = 0.85f;\r\n    private static final float CLOSE_THRESHOLD = 0.4f;\r\n    private final MainActivity mainActivity;\r\n    private int state = 0;\r\n\r\n    GraphicFaceTracker(MainActivity mainActivity) {\r\n        this.mainActivity = mainActivity;\r\n    }\r\n\r\n    private void blink(float value) {\r\n        switch (state) {\r\n            case 0:\r\n                if (value > OPEN_THRESHOLD) {\r\n                    \/\/ Both eyes are initially open\r\n                    state = 1;\r\n                }\r\n                break;\r\n            case 1:\r\n                if (value < CLOSE_THRESHOLD) {\r\n                    \/\/ Both eyes become closed\r\n                    state = 2;\r\n                }\r\n                break;\r\n            case 2:\r\n                if (value > OPEN_THRESHOLD) {\r\n                    \/\/ Both eyes are open again\r\n                    Log.i(\"Camera Demo\", \"blink has occurred!\");\r\n                    state = 0;\r\n                    mainActivity.captureImage();\r\n                }\r\n                break;\r\n            default:\r\n                break;\r\n        }\r\n    }\r\n\r\n    \/**\r\n     * Update the position\/characteristics of the face within the overlay.\r\n     *\/\r\n    @Override\r\n    public void onUpdate(FaceDetector.Detections<Face> detectionResults, Face face) {\r\n        float left = face.getIsLeftEyeOpenProbability();\r\n        float right = face.getIsRightEyeOpenProbability();\r\n        if ((left == Face.UNCOMPUTED_PROBABILITY) ||\r\n                (right == Face.UNCOMPUTED_PROBABILITY)) {\r\n            \/\/ One of the eyes was not detected.\r\n            return;\r\n        }\r\n\r\n        float value = Math.min(left, right);\r\n        blink(value);\r\n    }\r\n}<\/pre>\n
Now once the image has been clicked, we display it in the PictureActivity.java<\/strong>.<\/p>\n
Below is the code for activity_picture.xml<\/strong>.<\/p>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\r\n<RelativeLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n    xmlns:tools=\"http:\/\/schemas.android.com\/tools\"\r\n    android:layout_width=\"match_parent\"\r\n    android:layout_height=\"match_parent\"\r\n    tools:context=\".ui.PictureActivity\">\r\n\r\n    <ImageView\r\n        android:id=\"@+id\/img\"\r\n        android:layout_width=\"match_parent\"\r\n        android:layout_height=\"match_parent\"\r\n        android:scaleType=\"fitXY\"\r\n        android:src=\"@mipmap\/ic_launcher\" \/>\r\n\r\n<\/RelativeLayout><\/pre>\n
And the code for PictureActivity.java<\/strong> is below.<\/p>\n
package com.test.camerademo.ui;\r\n\r\nimport android.os.Bundle;\r\nimport android.support.v7.app.AppCompatActivity;\r\nimport android.view.View;\r\nimport android.widget.ImageButton;\r\nimport android.widget.ImageView;\r\n\r\nimport com.test.camerademo.R;\r\n\r\npublic class PictureActivity extends AppCompatActivity {\r\n    private ImageView imageView;\r\n\r\n    @Override\r\n    protected void onCreate(Bundle savedInstanceState) {\r\n        super.onCreate(savedInstanceState);\r\n        setContentView(R.layout.activity_picture);\r\n\r\n        imageView = findViewById(R.id.img);\r\n        imageView.setImageBitmap(MainActivity.bitmap);\r\n    }\r\n}<\/pre>\n
Now on running this code, we can see that on blinking our eyes, an image will be captured and displayed.<\/p>\n
InnovationM is a globally renowned\u00a0Mobile app development company<\/a>\u00a0that caters to a strong & secure Android app development, iOS app development, hybrid app development services. Our commitment & engagement towards our target gives us brighter in the world of technology and has led us to establish success stories consecutively which makes us the best\u00a0iOS app development company.<\/p>\n
That’s all for this post. Hope you enjoyed learning. \ud83d\ude42<\/p>\n","protected":false},"excerpt":{"rendered":"
The Mobile Vision API provides a framework for recognizing objects in photos and videos. The framework includes\u00a0detectors, which locate and describe visual objects in images or video frames, and an event-driven API that tracks the position of those objects in video. The objects that can be tracked by Mobile Vision API include facial features, text […]<\/p>\n","protected":false},"author":1,"featured_media":5801,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,71],"tags":[],"class_list":["post-5564","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-android","category-mobile"],"yoast_head":"\nCapture Image on Eye Blink - InnovationM - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.innovationm.com\/blog\/capture-image-on-eye-blink\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Capture Image on Eye Blink - InnovationM - Blog\" \/>\n<meta property=\"og:description\" content=\"The Mobile Vision API provides a framework for recognizing objects in photos and videos. 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