Invoke matlab through c#

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Hi
I am working on my final year project which have two parts
1, image processing in which i am classifying emotions through facial gesture
And 2 is c # parts in which on the basis of emotions we are performing different functionality automatically for eg if a person is sad then in background the sad playlist will play ,,
i have created Executable(exe) file of matlab code nd invoke through c# but its taking too much time to execute , round about 3 to 4 min ,please tell me if some one knows the other efficient method of calling matlab help me please email me on [email removed]

Posted 22-Dec-13 16:31pm

Member 10380349

Updated 22-Dec-13 16:41pm

Ron Beyer

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Ron Beyer 22-Dec-13 22:41pm

How can we possibly know if there is a "more efficient" method if we have no idea the method you are currently using? Also, don't post your email in a public forum unless you enjoy a full mailbox of spam.

Peter Leow 23-Dec-13 12:37pm

Let see if I understand you correctly. You have an image classifier built on matlab code and it has been trained on some historical data set. This trained classifier has been compiled into an exe. The role of c# code here is to send new image to this exe classifier which in turn classify this image and returns the result (say 'sad' or 'happy') to your c# code. It is working but takes too long. Am I correct?

How do you know the problem lies within c# code and not the matlab code. Have you tried classifying the same new image using the trained classifier in the MATLAB environment to compare its response time.

Member 10380349 25-Dec-13 22:39pm

thanks for your comment ,,
No its not like that you understand , different i m capturing live image from camera, and which give me mood sad or happy ,and the role of c#is that on the basis of mood my system performing different functionality through c# i define a timer of 5 min in c# after every five min system calls an exe of matlab through which i get new image ,matlab totaly consist of camera code only, when i run matlab script in matlab its just take 10sec only for completion , while when i call .exe of matlab code it take 3 to 4 min in execution ,i build .exe of matlab through mcc -m

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Peter Leow · Answer 1 · 2013-12-23T06:56:00

Let see if I understand you correctly. You have an image classifier built on matlab code and it has been trained on some historical data set. This trained classifier has been compiled into an exe. The role of c# code here is to send new image to this exe classifier which in turn classifies this image and returns the result (say 'sad' or 'happy') to your c# code. It is working but takes too long. Am I correct? How do you know the problem lies within c# code and not the matlab code. Have you tried classifying the same new image using the trained classifier in the MATLAB environment to compare their response time?

If you are still interested in 'other efficient method', there are three ways to integrate matlab code into a c#, briefly:
1. COM
2. .NET assembly
3. C Shared library

Read the details and demo from the MATLAB Central Integrating MATLAB with C#.

Albert Holguin · Answer 2 · 2013-12-23T05:32:00

Solution 1

Making something faster is usually application specific, or specific to what you are doing. We can't tell you how to make something faster without seeing what it is you are doing.

I assume you are doing a bunch of image processing with Matlab, did you make the algorithms yourself or are you using libraries? ...if you're using libraries, you'll likely have to rewrite portions of it yourself in order to make it work a lot faster.

In addition, if you happened to do it in a native language you'd be able to speed up the process by pre-allocating memory for the images before-hand (since your images are going to be the same size, you can preallocate then use the same memory) and then passing it to an independent thread for the image processing. The results could be fed back to an independent thread for result processing. In another words, if you had a bunch of independent mechanisms working at the same time along with better memory management, you'd likely get better performance. Again, the process of optimization will be specific to what it is you are doing with the data and the type of data you are using.

Posted 23-Dec-13 5:32am

Albert Holguin

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Member 10380349 25-Dec-13 22:45pm

thanks albert for your comment
Actually i have converted matlab .m file to .exe and when i execute .exe its take round about 3 to 4 min to execute ,,in my case matlab .exe is totaly independent it just call through c#

Albert Holguin 26-Dec-13 10:29am

Matlab exe? ...did you just "compile" the Matlab code? ...those compilers rarely work well.

Member 10380349 26-Dec-13 11:49am

when i run in matlab application its work very well takes 9 to 10 sec nd shows result,,,,normally how much time taken for execution ?? i have build my code exe using this command mcc -m coed file.m i think its need the matlab run time environment ,,,,

Albert Holguin 26-Dec-13 11:56am

Execution time of any program is completely specific to that program. mcc is a Matlab compiler, but again, usually those types of compilers that convert one script into a different executable don't tend to do a great job. What I meant when I said convert it to a native language I meant write a program that will compile natively yourself.

Member 10380349 26-Dec-13 12:47pm

how ?

Albert Holguin 26-Dec-13 13:06pm

What do you mean how? ...Matlab give you the ability to design an algorithm, the coding is completely independent of the algorithm.

Member 10380349 26-Dec-13 13:21pm

wht u preffer me actually i m beginner so i dont have much idea wht can i do and how to do i want an fast exe

Albert Holguin 26-Dec-13 13:28pm

Like I said before... Optimization is VERY application specific. What makes one application fast for one use, usually ends up either reducing its flexibility or making it slow for a different use. That's why only the designer can optimize an application well. Matlab is going to run relatively slow due to its flexibility, it was designed as a "modeling" tool that can do it all. If you want something REALLY fast, you need to bound the problem and reduce OS overhead as much as possible.