Integral. Given an input image $pSrc$ and the specified value $nVal$, the pixel value of the integral image $pDst$ at coordinate (i, j) will be computed as. NVIDIA continuously works to improve all of our CUDA libraries. NPP is a particularly large library, with + functions to maintain. We have a realistic goal of. Name, cuda-npp. Version, Summary. Description, CUDA package cuda-npp. Section, base. License, Proprietary. Homepage. Recipe file.
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For example, on Linux, to compile a small application foo using NPP against the dynamic library, the following command can be used:. With a large library to support on a large and growing hardware base, the work to optimize it is never done! A mpp implementation may be close to optimal on newer devices. If it turns out to be with Nvidia then who knows when or if this gets fixed.
NVIDIA Performance Primitives (NPP): NVIDIA Performance Primitives
For this reason it is recommended that cudaDeviceSynchronize or at least cudaStreamSynchronize be called before making an nppSetStream call to change to a new stream ID. It would be great if you could send us an example of a failure case.
The replacements cannot be found in either CUDA 7. If I had to guess I’d say there is an optimization going wrong or the scaler could be running into a hardware limitation. I got maximum speedup in 16 bit Single channel image of size xwhich was To be safe in all cases however, this may require that you increase the memory allocated for your source image by 1 in both width and height.
It isn’t hard to beat standard sorting methods, if you know a lot about your data and are willing to bake those assumptions into the code. You can get the memory bandwidth stats for your kernel from the profiler and compare them to the maximum for your device.
In short, this function is a sinking ship. The final result for a signal value of being squared and scaled would be:.
The issue can be cuxa with CUDA 7.
NVIDIA Performance Primitives | NVIDIA Developer
The current release is IPP v9. To improve loading and runtime performance when using dynamic libraries, NPP recently replaced it with a full set of nppi sub-libraries.
In order to map the maximum value of to in the result, one would specify an integer result scaling factor of 8, i.
I’m not saying it should be removed.
Visit the Trac open source project at http: After getting some info from the Nvidia forums and further reading is this the situation as it presents itself to me: Although one can influence the result with a different pixel shift and thereby produce distinguishable images from the algorithms does this also cause a minor shift in the image itself, which isn’t acceptable.
I may have found something. So far the only response I got was to send in a feature request for Nvidia to provide the new functions, which I’ve done. NPP will evolve over time to encompass more of the compute heavy tasks in a variety of problem domains. Last modified 2 years ago. Tunacode in Pakistan has some stuff too. Primitives belonging to NPP’s image-processing module add the letter “i” to the npp prefix, i.
When you roll your own, you can use all the assumptions specific to your situation to speed things up.
One can see the effect here in a montage of various combinations of hardware and software scalers cua encoders. As an aside, I don’t think any library can ever be “fully optimized”.