我正在尝试解决一个问题,需要将彩色图像转换为灰度图像。为此,我使用了CUDA并行处理的方法。
我在GPU上调用的内核代码如下。
__global__
void rgba_to_greyscale(const uchar4* const rgbaImage,
unsigned char* const greyImage,
int numRows, int numCols)
{
int absolute_image_position_x = blockIdx.x;
int absolute_image_position_y = blockIdx.y;
if ( absolute_image_position_x >= numCols ||
absolute_image_position_y >= numRows )
{
return;
}
uchar4 rgba = rgbaImage[absolute_image_position_x + absolute_image_position_y];
float channelSum = .299f * rgba.x + .587f * rgba.y + .114f * rgba.z;
greyImage[absolute_image_position_x + absolute_image_position_y] = channelSum;
}
void your_rgba_to_greyscale(const uchar4 * const h_rgbaImage,
uchar4 * const d_rgbaImage,
unsigned char* const d_greyImage,
size_t numRows,
size_t numCols)
{
//You must fill in the correct sizes for the blockSize and gridSize
//currently only one block with one thread is being launched
const dim3 blockSize(numCols/32, numCols/32 , 1); //TODO
const dim3 gridSize(numRows/12, numRows/12 , 1); //TODO
rgba_to_greyscale<<<gridSize, blockSize>>>(d_rgbaImage,
d_greyImage,
numRows,
numCols);
cudaDeviceSynchronize(); checkCudaErrors(cudaGetLastError());
}
我看到第一个像素行中有一排点。
我遇到的错误是
libdc1394错误:无法初始化libdc1394
位置51处的差异超过了5的容差
参考值:255
GPU : 0
我的输入/输出图像
有人能帮我解决吗?提前感谢。