zero numpts return !!!

[james-ht-tech]

hi
i have a problem with cudasift on jetson orin , unfortunately return zero numpts, i dont know why??? is it related to gpu architecture (Ampere )or cuda version(Cuda compilation tools, release 11.4, V11.4.315)?? !!!!!
int devNum = 0;
SiftData siftData1;
cv::Mat limg;
InitSiftData(siftData1, 32768, true, true);
cv::imread("img1.png", 0).convertTo(limg, CV_32FC1);
std::cout << "Image size = (" << w << "," << h << ")" << std::endl;
std::cout << "Initializing data..." << std::endl;
InitCuda(devNum);
CudaImage img1;
img1.Allocate(w, h, iAlignUp(w, 128), false, NULL, (float*)limg.data);
img1.Download();
float initBlur = 1.0f;
ExtractSift(siftData1, img1, 5, initBlur, 3.5, 0.0f, false);
std::cout << "Number of original features: " << siftData1.numPts << std::endl;
FreeSiftData(siftData1);

outputs:
./mainSift
Image size = (1920,1080)
Initializing data...
Device Number: 0
Device name: Orin
Memory Clock Rate (MHz): 612
Memory Bus Width (bits): 128
Peak Memory Bandwidth (GB/s): 19.6
SIFT extraction time = 12.29 ms 0
Incl prefiltering & memcpy = 23.52 ms 0
Number of original features: 0

idont know why return 0 numpts!!!!