Android Application Programming with OpenCV Part-3

If the Auto Monitor Logcat window appears, select the Yes radio button and the verbose drop-down option, and click on OK. This option ensures that all the log output from the application will be visible in Eclipse.

Setting Up OpenCV [ 28 ] On the Android device you might get a message: OpenCV library package was not found! Try to install it? Make sure the device is connected to the Internet and then touch the Yes button on your device. The Play Store will open to show an OpenCV package. Install the package and then press the hardware back button to return to the sample application, which should be ready for use.

For OpenCV 2.4.3.2, the samples and tutorials have the following functionality:

                        Sample – 15 puzzle: It splits up a camera feed to make a sliding-block puzzle. The user may swipe blocks to move them.

                        Sample – color-blob-detection: It detects color regions in a camera feed. The user may touch anywhere to see the outline of a color region.

                        Sample – face-detection: It draws green rectangles around faces in a camera feed.

                        Sample – image-manipulations: It applies filters to a camera feed. The user may press the Android menu button to select from a list of filters.

                        Tutorial 1 – Add OpenCV: It displays a camera feed. The user may press the … menu to select a different camera feed implementation (Java or native C++).

                        Tutorial 2 – Use OpenCV Camera: It applies filters to a camera feed. The user may press the … menu to select from a list of filters.

                        Tutorial 3 – Add Native OpenCV: It draws red circles around interest points or features in a camera feed. Generally speaking, interest points or features lie along the high-contrast edges in an image. They are potentially useful in image recognition and tracking applications.

                        Tutorial 4 – Mix Java+Native OpenCV: It combines the functionality of Tutorial 2 and Tutorial 3. The user may press the … menu to select from a list of filters and a preview of interest points.

                        Tutorial 5 – Camera Control: It applies filters to a camera feed, which has a customizable resolution. The user may press the … menu to select from a list of filters and a list of resolutions.

Try these applications on your Android device! While an application is running, its log output should appear in the LogCat tab in Eclipse.

Feel free to browse the projects' source code via Package Explorer, to see how they were made. Alternatively, you might want to return to the official samples and tutorials later, after we have built our own project over the course of this book.

Finding documentation and help

The OpenCV Java API and C++ API are both relevant to Android. The Java API documentation is online at http://docs.opencv.org/java/. The C++ API documentation is online at http://docs.opencv.org/. The following documents, which mostly use C++ code, are also available as downloadable PDF files:

                        API reference: http://docs.opencv.org/opencv2refman.pdf

                        Tutorials: http://docs.opencv.org/opencv_tutorials.pdf

                        User guide (incomplete): http://docs.opencv.org/opencv_user.pdf 

If the documentation does not seem to answer your question, try talking to the OpenCV community. Here are some sites where you will find helpful people:

                        Official OpenCV forum: http://www.answers.opencv.org/questions/

                        Jay Rambhia's blog: http://jayrambhia.wordpress.com/

                        The support site for my OpenCV books: http://nummist.com/opencv/

Also, you can read or submit bug reports at http://code.opencv.org/projects/ opencv/issues?query_id=4. Finally, if you need to take your issue to the highest authority, you can email the OpenCV4Android developers at android@opencv.org.

Summary

By now, we should have an Android and OpenCV development environment that can do everything we need for the project described in this book. Depending on which approach we took, we might also have a set of tools that we can use to reconfigure and rebuild OpenCV for our future needs.

We know how to build the OpenCV Android samples in Eclipse. These samples cover a different range of functionality than this book's project, but they are useful as additional learning aids. We also know where to find documentation and help.

Complete The Chapter-1

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