Android Application Programming with OpenCV by Joseph Howse

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By Joseph Howse

Take a cellphone out of your pocket, and inside a couple of seconds, you could snap a photograph, control it, and proportion it with the area. you will have simply completed mass creation of picture info. With a working laptop or computer imaginative and prescient library similar to OpenCV, you could study and rework copious quantities of photo info in genuine time on a cellular machine. The upshot to this can be that you just, as builders, delivers cellular clients with many new different types of photographs, regularly highlighting convinced visible gains which are of creative or functional curiosity. Android is a handy platform for such experiments since it makes use of a high-level language (Java), it presents standardized interfaces for sharing photo info among purposes, and it truly is quite often open resource, so every person can learn its implementation.

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Extra info for Android Application Programming with OpenCV

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Also, to avoid seeing unnecessary warnings in Eclipse, we add the @SuppressLint("NewApi") annotation to the declaration of onCreate(). Several other activity lifecycle callbacks are also relevant to OpenCV. When the activity goes into the background (the onPause() callback) or finishes (the onDestroy() callback), the camera view should be disabled. When the activity comes into the foreground (the onResume() callback), the OpenCVLoader should attempt to initialize the library. disableView(); } } Note that, in onResume(), we re-enable menu interaction.

Let's start by looking at the onCreate() and onSaveInstanceState() callbacks. These methods, respectively, are called at the beginning and end of the activity lifecycle. The onCreate() callback typically sets up the activity's view hierarchy, initializes data, and reads any saved data that may have been written last time onSaveInstanceState() was called. For details about the Android activity lifecycle, see the official documentation at http://developer. com/reference/android/app/Activity. html#ActivityLifecycle.

We will use OpenCV functionality wherever feasible, even though we could just use the standard Android libraries to display a live camera feed, save a photo, and so on. OpenCV provides an abstract class called CameraBridgeViewBase, which represents a live camera feed. This class extends Android's SurfaceView class, so that its instances can be part of the view hierarchy. Moreover, a CameraBridgeViewBase instance can dispatch events to any listener that implements one of two interfaces, either CvCameraViewListener or CvCameraViewListener2.

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