opencv for desktop java

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I can't vote on my own question. I agree with Samuel on some points. Android port should be split into parts and developers should be able to embed only the necessary parts into their applications. I've found that OpenCV manager idea frustrating for a regular Android user.

Please don't mix things. OpenCV Manager is aimed to help you make your applications cross-platform and fast. You simply will not be able to achieve the same level of performance and power efficiency without it. Yes it takes 2 downloads (manager + package) before the first OpenCV application is run, but we hope to see the OpenCV Manager on every consumer device someday. It is even possible that it will be preinstalled by vendors. If you have any suggestions on how to make OpenCV Manager better, please let us know at OpenCV4Android google group.

And finally Java is not the best approach to build CV apps. You should prefer C++ for professional development. It allows you to develop/debug on desktop, and you can later reuse your code for other mobile platforms.

Please explain me, because I don't see how OpenCV manager makes applications fast and cross platform. The alternative is embedding OpenCV natives into the app, that way the app still uses same OpenCV libraries and hence performs the same. I agree size matters here, embedding almost 20M to each app is not acceptable, here comes splitting into the scene. Of course there are other issues, like updating all the apps vs updatind a single manager, but again for a regular user updating his app instead of updating a 'god knows what' manager makes more sense. Just my two cents.. Seeing OpenCV manager pre-installed by vendors should be great of course. But it won't happen tomorrow, right? Even then there will be non-confirming vendors, and we end up in the same place and should handle that too.

Today there are devices on armv5, armv7, armv7+NEON, x86, MIPS is coming, and more to come. If you're going to support all of them, 20M is probably not enough. OpenCV Manager gives you prebuilt OpenCV binary best suitable for your hardware. It will use NEON and SSE where available (3x on average), it will use some advanced optimizations on Tegra 3 platform (coming soon). Of course you can support all this zoo by yourself, but you can delegate it to the Manager. I really think that there is no way for us without it, so we should better discuss how can we make it better.