[rbourke]

Jpap invented a new more efficient JPEG codec - even faster than hardware encoders that use less efficient codecs. Also I think you can optimize hardware usage of iOS devices at the assembler level - it is not as locked down as Android.

[Rebelgecko]

You can include assembly in Android apps (it might require the NDK). The bigger problem is that an Android device could be ARM, x86, or even MIPS.

[gbhn]

That matches my recollection as well. Also see http://www.gizmag.com/snappycam-iphone-app/28558/

A really nice technical achievement. Not at all simple or run-of-the-mill.