Image editing using ArrayFire: Part 2

Pradeep Garigipati ArrayFire, Image Processing 10 Comments

A couple of weeks back, we did a post on a few image editing functions using ArrayFire library. Today, we shall be doing the second post in the series Image Editing using ArrayFire. We will be looking at the following operations today. Image distortion Noise addition Noise reduction Edge filters Boundary extraction Difference of gaussians Code and sample input/outputs corresponding to each operation are described below. Image distortion We will be looking at spread and pick filters in this section. Both of these filters are fundamentally the same, they replace each pixel in the original image with one of it’s neighboring pixels. How the neighbor is chosen is essentially the difference between spread and pick. Both of these functions use …

Image editing using ArrayFire

Pradeep Garigipati ArrayFire, Image Processing 2 Comments

In this post, we will be looking at the following simple image editing operations using the ArrayFire library. contrast modification brightness modification translation digital zoom alpha blending unsharp mask Code required to do each operation and the corresponding input/output sample are given below in their corresponding sections. All the operations are built using some existing image manipulation functions and the awesome element-wise operations in ArrayFire. Contrast modification /** * contrast value should be in the range [-1,1] **/ void changeContrast(array &in, const float contrast) { float scale = tan((contrast+1)*Pi/4); in = ((in/255.0f – 0.5f) * scale + 0.5f) * 255.0f; } Brightness modification /** * brightness value should be in the range [0,1] **/ void changeBrightness(array &in, const float brightness, …

ArrayFire on Tegra K1

Shehzan Mohammed ArrayFire 2 Comments

We’re pleased to announce the arrival of ArrayFire for NVIDIA Tegra K1! This version of ArrayFire comes with all the capabilities and features of our standard version of ArrayFire. It includes all ArrayFire CUDA functionality—with the exception of linear algebra support—as well as fully operational graphics support. ArrayFire for Tegra currently works with Tegra K1 processors running Linux for Tegra. We invite and encourage you to test it out on your boards and give us feedback; any bug fixes or performance improvements will be promptly resolved, as this is a separate branch of ArrayFire. If you’d like to deploy ArrayFire on Android, feel free to contact us for further support. We are open to partnering with anyone wishing to deploy ArrayFire in other …

Indexing with ArrayFire

Umar Arshad ArrayFire Leave a Comment

ArrayFire is a fantastic library when it comes to performance. One of the things that people overlook when looking into ArrayFire is it’s powerful indexing capabilities. The main data structure in the ArrayFire library is the array. The array stores the data in a column major order. This means that the following code: float a[] = {1, 2, 3, 4, 5, 6, 7, 8, 9}; array A(3, 3, a); Will produce the following matrix: Notice how the first three values of the a array make up the first column of A. When you want to perform an operation on every element of the array you can just use the variable name with the operation. The following command adds 5 to …

Image Processing Benchmarks on NVIDIA Jetson TK1

Pradeep Garigipati ArrayFire, Benchmarks, CUDA 7 Comments

In this post we will be looking at benchmarks of the following ArrayFire image processing functions on an ARM device. Erosion/Dilation Median filter Resize Histogram Bilateral filter Convolution We pitted the brand new compute 3.2 GPU on NVIDIA Jetson TK1 against a mobile NVIDIA GPU. The closest match to the GPU (from here on referred as TK1) on the Jetson board we have in our mobile card deck is a NVIDIA GT 650M. The GPU device properties that have critical effect on the function performance are listed below. Property Name / Device Name Jetson TK1 GK20A GT 650M Compute 3.2 3.0 Number of multiprocessors 1 2 Cores 192 384 Base clock rate 852 MHz 950 MHz Total global memory 1746 …

Joint Webinar with AMD: An Introduction to OpenCL Libraries

Scott Announcements, ArrayFire, Events, OpenCL Leave a Comment

Back by popular demand! You’re invited to join us for a second webinar held jointly with AMD to discuss productive OpenCL Programming – An Introduction to OpenCL Libraries. We had so many people attend the first one, we decided to hold a second webinar! The webinar will be held on Monday, May 19 at 9 am PT / 11 am CT / 12 pm ET. Join ArrayFire COO Oded Green as he demonstrates best practices to help you quickly get started with OpenCL programming.  Learn how to get the best performance from AMD hardware in various programming languages using the ArrayFire library. Oded will discuss the latest advancements in the OpenCL ecosystem, including cutting edge OpenCL libraries such as clBLAS, clFFT, clMAGMA and ArrayFire. …

Open Source Initiatives from ArrayFire

Pavan Yalamanchili Announcements, ArrayFire, CUDA, Fortran, Java, Open Source, OpenCL, OpenGL, R Leave a Comment

At ArrayFire we like to use a lot of Free/Open Source software. We use various Linux distributions, Jenkins, Gitlab, gcc, emacs, vim and numerous other FOSS tools on a daily basis. We also love the idea of developing software collaboratively and openly. Last year we started working with AMD on CL Math Libraries. Internally we’ve had numerous discussions about contributing to the GPGPU community. However, it’s neither simple nor straightforward to take a closed software Open Source. Earlier this year, we decided to take the first step and Open Source all of the ArrayFire library’s  tertiary projects. This includes all of our ArrayFire library’s language wrappers, examples, and source code used for our blog posts. All of our projects are hosted at our …

ArrayFire v2.1 Official Release

Aaron Taylor Announcements, ArrayFire, CUDA, OpenCL Leave a Comment

It’s that time again—we’re pleased to announce the release of our newest version of ArrayFire: ArrayFire v2.1. ArrayFire v2.1 is now bigger, faster, and stronger, thanks to some key function additions, API changes, feature improvements, and bug fixes. ArrayFire is a CUDA and OpenCL library designed for maximum speed without the hassle of writing time-consuming CUDA and OpenCL device code.  With ArrayFire’s library functions, developers can maximize productivity and performance. Each of ArrayFire’s functions has been hand-tuned by CUDA and OpenCL experts. Major Updates Support for CUDA 6.0 Support for Mac OS X New language support (available on github)       ArrayFire for Java       ArrayFire for R!       ArrayFire for Fortran* ArrayFire Extras on Github       All language wrappers       …

New Look, Same Acceleration Gang

Aaron Taylor Announcements, ArrayFire Leave a Comment

We have officially rebranded from AccelerEyes to ArrayFire! Our rebranding includes a website redesign, improved documentation, and–bonus–an upcoming release of a new version of the ArrayFire software library. We have even more innovations waiting in the wings, and we are optimistic of a bright future under our new banner! Please don’t hesitate to contact us if you have any questions about this transition–we’re happy to help you find what you’re looking for and to assist in whatever ways we can. If you want faster code, you’ve come to the right place! -The ArrayFire Gang

ArrayFire-OpenGL Interop using CUDA

Shehzan Mohammed ArrayFire, CUDA, OpenGL Leave a Comment

A lot of ArrayFire users have been interested in the usage of ArrayFire in partnership with OpenGL for graphics computation. In the long run, we do plan to expand further on the interoperablilty and make it easier through ArrayFire. For now, we have developed a small example to expand on the usage of the CUDA-OpenGL interop API to assist in the interop operations between ArrayFire and OpenGL. Some of the advantage of direct ArrayFire-OpenGL interop are: Faster data transfers: Since the OpenGL buffers as well as ArrayFire data reside on the GPU, we can use a direct device to device copy rather than using the CPU as an intermediate and the relatively slow PCIe interface. Offscreen rendering: It is commonly …