Question

我正在尝试实现一个OpenCL项目，它应该输入两个“灰色”通道图像并返回一个“灰色”通道缓冲区

我的OpenCL代码：

 __kernel void motion_detection(__global uchar* bgImage, __global uchar* motionImage,__global uchar* outputImage)
{
  int i = get_global_id(0);
  int tsh = 7;
  uchar bgEl = bgImage[i];
  uchar motionEl = motionImage[i];


float bg = convert_float(bgEl);
float mo = convert_float(motionEl);
float temp = fabs(bg-mo);

if(temp>tsh){temp=255.0;
 }else
       {temp=0.0;
     }

outputImage[i] = convert_uchar(bg);
}

我的主人：

// get width and height of input image
height = inputImage->rows;
width = inputImage->cols;

// get the pointer to pixel data
cl_uchar* inputImageData = inputImage->data;
cl_uchar* motionImageData = motionImage->data;
cl_uchar* outputImageData = outputImage->data;

设置缓冲区后：

// Create memory object for input Image
inputImageBuffer = clCreateBuffer(
    context,
    CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR,
    width * height * greyPixelSize,
    inputImageData,
    &status);
CHECK_OPENCL_ERROR(status, "clCreateBuffer failed. (inputImageBuffer)");

motionImageBuffer = clCreateBuffer(
    context,
    CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR,
    width * height * greyPixelSize,
    motionImageData,
    &status);
CHECK_OPENCL_ERROR(status, "clCreateBuffer failed. (inputImageBuffer)");


// Create memory objects for output Image
outputImageBuffer = clCreateBuffer(
    context,
     CL_MEM_READ_WRITE,
    width * height * greyPixelSize,
    0,
    &status);

设置参数并执行OpenCL内核：

// input buffer image
status = clSetKernelArg(
    kernl,
    0,
    sizeof(cl_mem),
    &inputImageBuffer);
CHECK_OPENCL_ERROR(status, "clSetKernelArg failed. (inputImageBuffer)");

status = clSetKernelArg(
    kernl,
    1,
    sizeof(cl_mem),
    &motionImageBuffer);
CHECK_OPENCL_ERROR(status, "clSetKernelArg failed. (inputImageBuffer)");

    // outBuffer imager
    status = clSetKernelArg(
    kernl,
    2,
    sizeof(cl_mem),
    &outputImageBuffer);
CHECK_OPENCL_ERROR(status, "clSetKernelArg failed. (outputImageBuffer)");

status = clEnqueueNDRangeKernel(
    commandQueue,
    kernl,
    1,
    NULL,
    globalThreads,
    localThreads,
    0,
    NULL,
    &ndrEvt);
clFinish(commandQueue);

这是我的问题，当执行此指令时，它将outputImageData返回为“\ 0”而不是其他内容：

status = clEnqueueReadBuffer(
    commandQueue,
    outputImageBuffer,
    CL_TRUE,
    0,
    width * height * greyPixelSize,
    outputImageData,
    0,
    NULL,
    NULL);
CHECK_OPENCL_ERROR(status, "clEnqueueReadBuffer failed.");

clEnqueueReadBuffer返回一个void缓冲区

0 个答案: