I'm aware that Sikulix uses Jython and OpenCV for it's template matching, but I'm interested in performing some more complicated image processing tasks. Is it possible to directly access OpenCV in Sikulix/Jython, and are there any examples of how one would do this?
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I have written a script for sequence classification using TensorFlow in Python. I would like to port this code to Android. I have seen the example on the TensorFlow github page regarding Android but that is for images.
Is there any way to directly port my TensorFlow Python code on Android?
The typical way to do this is to build (and train) your model using Python, save the GraphDef proto to a file using tf.train.write_graph(), and then write an app using the JNI to call the C++ TensorFlow API (see a complete example here).
When you build your graph in Python, you should take note of the names of the tensors that will represent (i) the input data to be classified, and (ii) the predicted output values. Then you will be able to run a step by feeding a value for (i), and fetching the value for (ii).
One final concern is how to represent the model parameters in your exported graph. There are several ways to do this, including shipping a TensorFlow checkpoint (written by a tf.train.Saver) as part of your app, and running the restore ops to reload it. One method, which has been used in the released InceptionV3 model is to rewrite the graph so that the model parameters are replaced with "Const" nodes, and the model graph becomes self contained.
There is QPython or Kivy.
QPython - Android Apps on GooglePlay. It's a script engine that runs Python on android devices. It lets your android device run Python scripts and projects. It contains the Python interpreter and some other stuff like pip, but there's no compiler available, so only pure-python packages will work.
Python for Android - lets you compile a Python application into an Android APK together with additional packages both pure-python and those that need compiling.
We're moving to Windows Phone 8. But since many good libraries out there are in pure C. So what is the best way for Windows Phone C# application to consume this C library?
Place C code in WP Static library. Then reference it from WP Runtime
component
Place C code in WP Runtime component
What is the best practice ?
There isn't any real difference between the two approaches. A static library is nothing but a collection of .obj files, the exact same kind of .obj files that you'll get from approach #2. After the linker is done, there won't be any difference in the result.
That's when everything is perfect, an ideal that can be very difficult to achieve when you use open source C code. An advantage of a static .lib is that it improves build time, not having to re-generate the .obj files. But that's also their disadvantage, you'll shoot your foot if you use a .lib that was created by somebody else and he didn't use the same compiler version or compile options. The simplest example of such a trap is building your Debug version and the .lib was built for Release. Or if it uses winapi functions that are verboten in a Phone app, pretty common. So #3 is the best way to avoid problems, build the .lib yourself so you can control all the compile and link settings. Do beware however that it can be very difficult to get open source C code to build, it often comes with a very extensive configuration script, designed to deal with the differences between the many architecture and Unix variants.
Is there any way to use the library of other language in Action Script 3 ?
For C/C++
I learned that we can use Alchemy: http://labs.adobe.com/technologies/alchemy/
But for other languages (here I mean Ruby or Java), can I use their libs via AS3 ?
Alchemy is a cross-compiler from LLVM to ABC, if the language you are interested in can compile to LLVM, then, in theory, you can compile to ABC. So, Alchemy supports (with some tweaks) also C# or Java (but you will have to spend some time getting them to work together, there's no out of the box solution).
AIR (which is a desktop variant of Flash) can use something called "NativeProcess" which means that granted the operating system can execute the code in the library, then you can do so by creating a new process that calls the function from the library you need.
In AIR, again, there's a new feature called ANE (AIR Native Extensions) - this allows you to bind AIR more tightly to the native code. But, it doesn't need to be native as in object files only, it should be something the underlying system can execute. But I have to confess, I never tried creating any such extension, so my knowledge of it is theoretical.
No you can not use Ruby or Java code/libraries in Flash. Alchemy only allows you to use C and C++ libraries. The only way is to port those libraries to ActionScript, or maybe the library you want to use has already been ported to AS3.
It is also possible that there is something similar in AS3. You could ask another question here or on an Flash forum if anyone knows if the library you need has an equivalent in flash.
I have a situation where I need to generate SWF from the FLA that user uploads on to the server. We use python and bash scripts, and work on Ubuntu Server 10.04 (64bit), any help on how to generate the SWF would be a great help.
Thanks.
Flash needs Flash IDE for compilation.
You probably can compile code using flex AS3 compiler on linux, but if there are graphical elements in Flash, you cannot compile them.
However, we had a similar situation, which we fixed by installing Flash in a MAC OS X Snow Leopard(10.6) and then wrote some php, some shell script, some applescript and made a command line compilation mechanism for AS3.
Mac OS X is a unix based os, so the command line is similar to any other unix. it comes with built in php, so you don't have to install anything.
Basically using script we dynamically generate something called .jsfl file. the jsfl contains the details of the .fla that needs to be compiled. these jsfl files can be executed by Flash IDE. so we invoke the flash IDE and pass on the generated .jsfl file. (http://gskinner.com/blog/archives/2004/08/jsfl_fla_batch.html)
This gskinner process works in windows also, but using mac we can make it command line. so that users can just ssh to the mac and execute the command to build the file.
FLA file format has changed significantly in the latest version of Flash. New FLAs are archives containing source files and assets, so you might be able to write a script unpacking a FLA and assembling an SWF from it. Prior versions of FLA contained proprietary format, not documented and there were no tools to process it in an automatic fashion, not on Linux for certain.
Depending on ActionScript version and your requirement to resource handling (by resources I mean images, fonts, sound tracks, videos etc) there are several options available:
Flex SDK, the material found in the blog post #ntidote refers to is somewhat dated, but it's OK / should work. You would need to consult MXMLC usage documentation to find out all available options (and some new required ones, not covered in the blog post). This is what you can do, if your goal is to compile AS3. This does not include video transcoding and you might find it challenging to embed vector graphics. MXMLC is, however, capable of compiling a large subset of SVG. It can also compile FXG - a new interchange graphic format that can describe vector shapes and text.
ActionScript 2 can also be compiled, but Flex doesn't offer a compiler for that. There is a very good, in fact a much better than the one written by Adobe, compiler for AS2: http://tech.motion-twin.com/mtasc.html .
There are other tools that are capable of generating SWFs - all depends on what exactly you need to do. Here's a good collection of different utilities: http://www.swftools.org/
Haxe is a whole other programming language that can compile to SWF. It also has its own linkers and ways of managing resources. http://haxe.org/
There is this project, which allows you to compile complex vector graphics and even animations from XML descriptions: http://code.google.com/p/hxswfml/
I'm interested in using CUSP library for CUDA (available here). However, I'm either having trouble getting this library to work with my application linking with CUDA and/or CUBLAS static libraries. I'm assuming from glancing through the header and source files that I either use the kernels by building the related files as a static library file (using nvcc compiler) to be used in my application (which is built using MS Visual Studio compiler), or use the kernels directly in my application (which I don't know how it's going to work out). The CUSP library also uses METIS library as well, which I also have trouble figuring out how to install it in Windows. What would be your suggestions on the best way of using CUSP features in my application? Thanks in advance.
After a quick look through the CUSP source, it seems that CUSP follows the same model as (and even makes use of) Thrust. These are template-based libraries that only make use of header files (with some #included inline code), like most of the STL and boost libraries. Take dia_matrix.h for example. The 'implementation' is in dia_matrix.inl, which is #included at the bottom of dia_matrix.h.
Take a look at the Thrust and CUSP examples for how to use these libraries in your own code. It should be nothing more than a matter of including the correct header files and working with the data types they provide. The CUDA kernels will be generated at compile time for you and you shouldn't need to worry about those details.