(Sometimes sample_data became bad because the buffer with its values was deallocated early).

On some platforms sin and cos are calculated in single precision resulting in
diversity of results.

String checking and range cheching added.

Problems with Android 2.3.3 (API level 10) fixed;
Android 2.2 does not work due to unsupported camera frame format (known android-2.2 emulator issue).

The size of temporary files is an issue on mobile platforms.