[meta-freescale] OpenCV OCL module Support on IMX6q

[Sébastien Taylor]

We have found that various issues with the Vivante OpenCL driver cause it to not be a great candidate for video processing.  The memory sharing is inconsistent and implicit copies have unreasonable CPU overhead.  Having said that we have implement a handful of algorithms using OpenGL shaders with good performance, again Vivante driver issues provide sub-optimal results but in this case they’re good enough to be worth the extra effort.

Freescale is aware of these issues, but I think they’re mostly at the mercy of Vivante providing fixes from my understanding.


On Nov 29, 2013, at 5:25 AM, Fikret Alim <fikret.alim at gmail.com> wrote:

> Dear Sebastian,
>  
> Thank you for your answer. The header is installed inside sysroot folder.
>  
> Actually, our purpose here is to use the GPU for some image/video processing tasks. We have tested OpenCV on IMX.6q, but for some algorithms, GPU usage will increase the performance. But, unfortunately, I couldn't find easy way to use the GPU. That's why I asked for OCL module.
>  
> Can I find some image processing examples created with OpenCL for IMX6? I searched from the web, but I couldn't find anything except hello world example.
>  
> Best Regards,
> Fikret
> On Thu, Nov 28, 2013 at 6:05 PM, Sébastien Taylor <me at staylor.ca> wrote:
> It is not supported no, as you mentioned it would require full profile and even then generally requires a pretty beefy GPU as well.  Is the header installed into the sysroot or just part of the sources?  You should be able to compile the OpenCL support as I’m not aware of host side differences between FP/EP but at run-time the kernels will fail to run and possibly fail to compile as well.
> 
> On Nov 28, 2013, at 6:56 AM, Fikret Alim <fikret.alim at gmail.com> wrote:
> 
>> Hello,
>> 
>> Does IMX6Q support OCL module of OpenCV for GPU programming? I have found ocl header insider opencv2/nonfree/ocl.hpp, but the ocl.hpp here includes opencv2/ocl/ocl.hpp which does not exist. There is no OCL folder inside opencv2 folder.
>> 
>> Is it supported? If yes, do I need to download from anywhere?
>> 
>> In the link below, it is mentioned that OpenCL version should be larger than 1.1 with FULL PROFILE in order to use OCL module. As far as I know, IMX6Q supports OpenCL 1.1 with Embedded Profile. It should not be supported according to the documentation, but I am confused for seeing ocl.hpp under nonfree folder.
>> 
>> OpenCL Module Introduction — OpenCV 2.4.7.0 documentation
>> 
>> Thanks&Best Regards,
>> 
>> Fikret
>> 
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> 

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