run opencl app on iMX6Q: openCV error

[Gavin]

we run the opencl test program(we want use GPU to accelate image processing speed) on the imx6q platform BSP Linux 3.14.52, and get the error infomation below(the same error happened in BSP Linux 4.1.15):
In image read [1520 x 932]
loops: 0, detect face using gpu...

OpenCV Error: Assertion failed (localThreads[0] * localThreads[1] * localThreads[2] <= kernelWorkGroupSize) in openCLVerifyKernel, file /home/tangb/yocto/imx-3.14.52-1.1.0_ga/build-fb/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/opencv/2.4.11+gitAUTOINC+2c9547e314-r0/git/modules/ocl/src/cl_operations.cpp, line 349
terminate called after throwing an instance of 'cv::Exception'
what(): /home/tangb/yocto/imx-3.14.52-1.1.0_ga/build-fb/tmp/work/cortexa9hf-vfp-neon-poky-linux-gnueabi/opencv/2.4.11+gitAUTOINC+2c9547e314-r0/git/modules/ocl/src/cl_operations.cpp:349: error: (-215) localThreads[0] * localThreads[1] * localThreads[2] <= kernelWorkGroupSize in function openCLVerifyKernel

Aborted
root@imx6qsabresd:~#

And we test function is:

void detect( Mat& img, vector<Rect>& faces,
ocl::OclCascadeClassifier& cascade,
double scale, bool calTime)
{
printf("detect face using gpu...\n\n");
ocl::oclMat image(img);
ocl::oclMat gray, smallImg( cvRound (img.rows/scale), cvRound(img.cols/scale), CV_8UC1 );
if(calTime) workBegin();
ocl::cvtColor( image, gray, CV_BGR2GRAY );
ocl::resize( gray, smallImg, smallImg.size(), 0, 0, INTER_LINEAR );
ocl::equalizeHist( smallImg, smallImg );

cascade.detectMultiScale( smallImg, faces, 1.1,
3, 0
|CV_HAAR_SCALE_IMAGE
, Size(30,30), Size(0, 0) );
printf("#### 6\n");
printf("detect %d faces:\n",faces.size());
for(int i = 0;i < faces.size();i++){
printf("face %d : (%d,%d,%d,%d)\n",i,faces[i].x,faces[i].y,faces[i].width,faces[i].height);
}
if(calTime) workEnd();
}

someone can tell us how to do?

[b36401]

Please look at this document regarding to face detection:
https://community.nxp.com/message/1026448

And this one is related to i.MX6:
http://imxcv.blogspot.com/2014/02/building-opencv-24x-for-freescales-imx6.html

Have a great day,
Victor

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