Hello, I'm using Odroid-XU3.And I installed Opencv 3.0.0-rc1 on odroid-xu3 ubuntu 14.04.
I have two question.
First, In procedure installing opencv, there's no opencl sdk directory option.I just check 'WITH_OPENCL' and etc.But, Using OpenCL function is successful. Why??????
Second, I tested OpenCV with OpenCL.I referenced the website http://www.learnopencv.com/opencv-tra...However, With OpenCL running time is 400ms and without OpenCL running time is 152ms.I want to solve the weird problem.
Please help meThank you
Regarding your first question, can you give more information about what you mean?
You say you enable OpenCL when building OpenCV... and that it builds fine and runs... and that it indeed runs using OpenCL.
Can I ask what your question actually is here, if the above is true?
Or are you asking more generally about the OpenCL SDK itself? Please note that the SDK we provide is a collection of sample codes that you can run on an already OpenCL enabled platform. It is not a 'driver SDK' and is not needed to get the platform working with OpenCL.
Please let me know if that didn't answer your question.
Kind Regards,
Michael McGeagh
Thanks to your answer!
In addition to my first question, when compile opencv3 using cmake, result is below.
There's no OPENCL_ROOT_DIR. (I can't select Mali OpenCL SDK library to use opencv)
But, the function for example ocl::setUseOpenCL(true) is perpectly running.
However, when ocl::setUseOpenCL(true) is executed, cvtColor that opencv function is slower than normal.
I'm Sorry due to a lack of English proficiency.
Once again, Thank you for your answer.
Hi,
Looks like everything is working as expected: you don't need to link against the Mali OpenCL SDK to get OpenCL support in OpenCV.
Like Tim explained, the reason it's slower is that the API is synchronous which is not suitable for GPUs. Moreover the OpenCL kernels have been written for a scalar architecture whereas Mali is vector based.
I'll implement OpenCL function needed.
Thanks!
HeeJin Park