对于Nvidia GTX480 GPU,使用驱动程序版本275.50和280.19重新采样图像,灰度值几乎没有变化.也许这是一个插值问题.除了OpenCL 1.1版的实现之外,我无法确定新版本中的更改.仅使用OpenCL 1.0,灰度值的变化相同.
在下面的代码中,驱动程序版本275.50和280.19之间给出了不同的结果:
success oclInitImgData(struct _Image2d *image)
{
cl_image_format volume_format;
volume_format.image_channel_order = CL_R;
volume_format.image_channel_data_type = CL_UNORM_INT16;
size = len[0] * sizeof(unsigned short);
img_h = clCreateImage2D(Ocl._GPUContext, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR,
&volume_format, len[0], len[1], size, data, &error);
resampledImg_h = clCreateBuffer(Ocl._GPUContext, CL_MEM_READ_WRITE, size, NULL, &error);
oclResampleImg(Ocl._GPUCommandQueue[posSet], Ocl._pGPUKernels[posSet][K_IMG_RESAMPLE], img_h, resampledImg_h , Size, PixelSize, mm_per_p, vm_h);
}
__kernel void resampleImage( __read_only image2d_t IN image, __global uint OUT *resampledImage)
{
//get resampled position
int2 posResampledImg = (int2)(get_global_id(0), get_global_id(1));
//get dimension of the image
int2 …