http://www.cs.unc.edu/~ccwu/siftgpu/ - Changchang Wu
SIFT Implementation
SiftGPU is an implementation of SIFT [1] for GPU. SiftGPU processes pixels parallely to build Gaussian pyramids and detect DoG Keypoints. Based on GPU list generation[3], SiftGPU then uses a GPU/CPU mixed method to efficiently build compact keypoint lists. Finally keypoints are processed parallely to get their orientations and descriptors.
SiftGPU is inspired by Andrea Vedaldi's sift++[2] and Sudipta N Sinha et al's GPU-SIFT[4] . Many parameters of sift++ ( for example, number of octaves, number of DOG levels, edge threshold, etc) are also available in SiftGPU. The shader programs are dynamically generated according to the parameters that user specified.
SiftGPU also includes a GPU exhaustive/guided sift matcher SiftMatchGPU. It basically multiplies the descriptor matrix on GPU and find closest feature matches on GPU. Both GLSL and CUDA implementations are provided.
Requirements
SiftGPU requires a high-end GPU (like nVidia 8800) that has a large graphic memory and supports dynamic branching. GLSL for OpenGL is used by default, and CUDA is provided as an alternative for nVidia graphic cards. Haven't fully tested on ATI, but the GLSL shaders did pass the AMD Shader Analyzer (Catalyst 8.12), it should be working.
SiftGPU uses GLEW 1.51, DevIL1.77 (can be disabled), GLUT(viewer only), and CUDA(optional). You'll need to make sure that your system has all the dependening libraries of corresponding versions. To update the libaries, you'll need to replace the header files in SiftGPU\Include\, and the corresponding binaries.
NOTE FOR CUDA : 1. The thread block setting is currently tuned on nVidia GTX 8800. It may not be optimized for other GPUs. 2. The CUDA version is not compiled by default. You need to define CUDA_SIFTGPU_ENABLED to the compiler and recompile the package. For VS2010 users, you can just use SiftGPU_CUDA_Enabled solution.
Download
SiftGPU-V371 (5.0MB; Including code, manual , windows binary and some test images) Want to cite SiftGPU?
You might be interested in the Matlab Versions mex'd by Adam Chapman and by Parag. K. Mital
SimpleSIFT.cpp gives some examples of using SiftGPU and SiftMatchGPU.
Previous versions of SiftGPU can be found through this link. A complete change list can be found here.
Some minor updates since V360
1. Converted the MSVC Solution to Visual Studio V2010 and tested CUDA4 (6/2011)
2. Automatic switching from OpenGL to CUDA when OpenGL is not supported (1/2011)
3. Dropped the indirect data transfer path CPU->GL->CUDA (1/2011)
4. Dropped the CG implementation to simplify maintance (1/2011)
Some previous changes
6. Added device selection for Multi-threading (Check the example at MultiThreadSIFT.cpp).
5. Used SSE to speedup the descriptor normalization step for the OpenGL implementation.
4. Added CUDA-based SiftGPU/SiftMatchGPU implementation. See Figure below for the speed.
3. Added OpenGL-based sift matching implementation, check example #7 in manual. (Thanks to Zach)
2. Added function to compute descriptors for user-specified keypoints, check example #6 in manual.
1. Improved speed by %50 compared with V293. Look here for experiment details and explanations
Evaluation
Below is the evaluation of the speed of V340 on different image sizes. "-fo -1" means using upsampled image. "-glsl" uses GLSL and "-cuda" uses CUDA (The experiment images are all resized from this image) . 
System : nVidia 8800GTX, 768MB, Driver 182.08, Windows XP, Intel 3G P4 CPU, 3.5G RAM. (V311 Speed)
Below is the comparision with Lowe's SIFT on box.pgm using the comparision code from Vedaldi's SIFT .
References
[1] D. G. Lowe. Distinctive image features from scale-invariant keypoints . International Journal of Computer Vision, November 2004.
[2] A. Vedaldi. sift++, http://vision.ucla.edu/~vedaldi/code/siftpp/siftpp.html.
[3] G. Ziegler, et al. GPU point list generation through histogram pyramids. In Technical Report, June 2006.
[4] Sudipta N Sinha, Jan-Michael Frahm, Marc Pollefeys and Yakup Genc, "GPU-Based Video Feature Tracking and Matching ",
EDGE 2006, workshop on Edge Computing Using New Commodity Architectures, Chapel Hill, May 2006
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