ocv3 ocl gpu acceleration on android ?

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hi all

even after replacing Mat by UMat, i don't get opencl gpu accerlation with opencv3.0(gold) on samsung s6/android 5.02 , what did i forgot ?

can i get faster gpu accelerated opencv if i use the SOC specific opencv Libs, rather than the generic openCL gpu acceleration ? (detecting at run time which opencv lib to load based on SOC name testing)

thank you.