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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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It may only be the filter will get removed due to this lack of support, for having a low image quality and being bound to a specific hardware and an external library. The function in question Mirroris np known performance issue that we will improve in a future release.

Maybe the NPP version works better for older devices. The default stream ID is 0. Before the results of an operation are clamped to the valid output-data range by multiplying them with. One can see the effect here in a montage of various combinations of hardware and software scalers and encoders. I’ve found better libraries out there for doing Npp image processing.

cuda-npp 9.0.252-1

In cases where the results exceed the original range, these functions clamp the result values back to the valid range. No, there is more than one duda. Post as a guest Name. Opened 2 years ago. All the code in ffmpeg does it passing the interpolation-method on to libnpp. Stack Overflow works best with JavaScript enabled. I personally like ArrayFire’s image processing selection and have found it to be fast, accelereyes.

The minimum scratch-buffer size for a given primitive e. Tunacode in Pakistan has some stuff too. This integer data is usually a fixed point fractional representation of some physical magnitue e.

We have a realistic goal of providing libraries with a useful speedup over a CPU equivalent, that are are tested on all of our GPUs and supported OSes, and that are actively improved and maintained.


If an application intends to use NPP with multiple streams then it is the responsibility of the application to call nppSetStream whenever it wishes to change stream IDs. Many NPP functions require converting floating-point values to integers. I’m not saying it should be removed. The following command on Linux is suggested:. I got maximum speedup in 16 bit Nnpp channel image of size xwhich was For details please see http: After getting some info from the Nvidia forums and further reading is this the situation as it presents itself to me: And if the shift was 1.

It does so by using the following cufa formula to select source pixels for interpolation: These allow to specify filter matrices, which I interpret as a sign of quality improvement and a confession on the poor quality of the ResizeSqrPixel?

See TracTickets for help on using tickets. Transfer input data from the host to device using cudaMemCpy The replacements cannot be found in either CUDA 7. For example the data-type information “8u” would imply that the primitive operates on Npp8u data. A subset of NPP functions performing rounding as part of their functionality do allow the user to specify which rounding mode is used through a parameter of the NppRoundMode type. It also allows developers who invoke the same primitive repeatedly to allocate the scratch only once, improving performance and potential device-memory fragmentation.

After reading the Nvidia forums did I notice a dev saying there were bugs The result would be clamped to be If I had to guess I’d say there is an optimization going wrong or the scaler could be running into a hardware limitation. The square of which would be clamped to if no result scaling is performed.

This allows for reuse of the same scratch buffers with any primitive require scratch memory, as long as it is sufficiently sized.

Not all primitives in NPP that perform rounding as part of their functionality allow the user to specify the round-mode used.


Last edited 2 years ago by sdack previous diff. Further does it say: Some primitives of NPP require additional device memory buffers scratch buffers for calculations, e. Last modified 2 years ago. Each picture shows the name of the algorithm, an encoder setting and the resulting file size of the video. Primitives with result scaling have the “Sfs” suffix in their name and provide a parameter “nScaleFactor” that controls the amount of scaling.

I’d like to wait for a response by Nvidia. What was the difference, in percent? It would be great if you could send us an example of a failure case.

Intel have provided replacement functions with IPP v7, which users should be using instead. Depending on the host operating system, some additional libraries like pthread or dl might be needed on the linking line. Intel have marked the corresponding function and variations as deprecated as of IPP v7.

# (filter “scale_npp” fails to select correct algorithm (Nvidia CUDA/NPP scaler)) – FFmpeg

The final result for a signal value of being squared and scaled would be:. To avoid the level of cud information due to clamping most integer primitives allow for result scaling. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

A naive implementation may be close to optimal on newer devices. Linking to only the sub-libraries that contain functions that your application uses can significantly improve load time and runtime startup performance.