topic Re: how to use OpenCL in OpenCV? in i.MX Processors

how to use OpenCL in OpenCV?

1019599657 — Wed, 20 Mar 2019 02:00:59 GMT

I am a green hand. i want to use OPENCL with opencv .I know that OpenCV support Intel's GPU default, And how I can use Imx8's GPU with OpenCV? If I need to compile with OpenCV source with OpenCL ? And I look for Information for Internet that when compile OpenCV with openCL, it need some .so ,like:

static const char *default_so_paths[] = {                                             "/system/lib64/libOpenCL.so",                                             "/system/vendor/lib64/libOpenCL.so",                                             "/system/vendor/lib64/egl/libGLES_mali.so"                                          };
However,I find libOpenCl.so and libGELSV1_CM_VIVANTE.so and libGLESv2_VIVANTE.so ,and others like libCLC.so libLLVM_vivo.so
libVSC.so libGAL.so ,whta i can need to used in the code above?

Re: how to use OpenCL in OpenCV?

Bio_TICFSL — Wed, 03 Apr 2019 15:26:01 GMT

Hi Li,

OpenCL and OpenCV are enable and comes by default in your yocto BSP for iMX8

Regards

Re: how to use OpenCL in OpenCV?

joanxie — Tue, 12 Jan 2021 07:45:28 GMT

you should find libOpenCL.so from <ROOTFS>/usr/lib, for more detailed information, pls refer to the Chapter 5 Graphics of enclosed file

Re: how to use OpenCL in OpenCV?

bernhardfink — Tue, 12 Jan 2021 11:01:18 GMT

Something to consider:

if you write native OpenCL code, then the GPU from the i.MX devices gets involved.
if you write OpenCV code, then the i.MX BSP uses the ARM NEON accelerators from the Cortex-A cores

This means that OpenCV based jobs may be executed much slower on i.MX, compared to platforms where OpenCV is supported by a GPU core.

Regards,
Bernhard.