- Super-resolution
Super-resolution (SR) are techniques that in some way enhance the resolution of an
imaging system. There are different views as to what is considered an SR-technique: some consider only techniques that break the diffraction-limit of systems, while others also consider techniques that merely break the limit of the digital imaging sensor as SR.There are both single-frame and multiple-frame variants of SR, where multiple-frame are the most useful. Algorithms can also be divided by their domain: frequency or space domain. By fusing together several low-resolution (LR) one enhanced-resolution image is formed.
The necessity of aliasing
In the most common SR
algorithm s, the information that was gained in the SR-image was embedded in the LR images in the form ofaliasing . This requires that the capturingsensor in the system is weak enough so that aliasing is actually happening. A diffraction-limited system contains no aliasing, for example, or a system where the total systemModulation Transfer Function is filtering outhigh-frequency content.Breaking the diffraction limit
There are also SR techniques that extrapolate the image in the frequency domain, by assuming that the object on the image is an
analytic function , and that we can exactly know the function values in someinterval . This method is severely limited by the noise that is ever-present in digital imaging systems, but it can work forradar ,astronomy or microscopy.See also
*
hyperacuity
*optical resolution
*Anti-Lamenessing Engine References
*G.T. Clement, J. Huttunen, and K. Hynynen, "Superresolution ultrasound imaging using back-projected reconstruction" Journal of the Acoustical Society of America, Volume 118, Issue 6, pp. 3953-3960, 2005.
*V. Cheung, B. J. Frey, and N. Jojic. "Video epitomes". In Proc. IEEE Conf. on Computer Vision and Pattern Recognition (CVPR), 2005.
*M. Bertero and P. Boccacci. "Super-resolution in computational imaging". Micron, 34:265–273, October 2003.
*S. Borman and R. Stevenson. "Super-resolution from image sequences — a review". Technical report, University of Notre Dame, 1998.
*S. C. Park, M. K. Park, and M. G. Kang., "Super-resolution image reconstruction: a technical overview", IEEE Signal Processing Magazine, 20(3):21–36, May 2003.
*S. Farsiu, D. Robinson, M. Elad, and P. Milanfar. "Advances and Challenges in Super-Resolution", International Journal of Imaging Systems and Technology, Volume 14, no 2, pp. 47-57, August 2004
* M. Elad and Y. Hel-Or, "Fast Super-Resolution Reconstruction Algorithm for Pure Translational Motion and Common Space-Invariant Blur ", IEEE Trans. on Image Processing, Vol 10, No 8, pp. 1187–1193, August 2001.
* M. Irani and S. Peleg, "Super Resolution From Image Sequences" ICPR, 2:115--120, June 1990
* F. Sroubek, G. Cristobal, and J. Flusser, "A Unified Approach to Superresolution and Multichannel Blind Deconvolution", IEEE Trans. Image Processing, vol. 16, pp. 2322-2332, 2007External links
Images
* [http://www.soe.ucsc.edu/~milanfar/SR-Software.htm MDSP RESOLUTION ENHANCEMENT SOFTWARE] — An implementation of several algorithms on Color and B&W data sets.
* [http://photoacute.com/ PhotoAcute] — A SR Software implementing superresolution algorithm based on correlating several digital images and optical system-dependent interpolation for Windows, Mac and Linux (under WINE).
* [http://www.download.com/QE-SuperResolution/3000-2169_4-10392417.html?tag=lst-1 QE SuperResolution 0.1.0.550] —Freeware implementation (only for Windows).
* [http://www.ece.lsu.edu/ipl/Demos.html SR GUI in Matlab] — Super-resolution software that includes both geometric and photometric registration (only for Windows).Video
* [http://www.psi.toronto.edu/~vincent/videoepitome.html Video super-resolution using video epitomes] .
* [http://cognitech.com/ Cognitech Video Investigator] — for law enforcement
* [http://www.salientstills.com/products/index.html Salient Stills VideoFOCUS]
* [http://www.letitwave.com/index.php?rubrique=3%20PRODUCTS&page=video_upconversion.htm Let It Wave] —NTSC /PAL toHDTV upconverter
* [http://www.motiondsp.com/ MotionDSP] — MotionDSP’s software re-constructs a high-resolution video from low-resolution video, enabling mobile phones, webcams, and security cameras to deliver higher-quality video, and enable a viewing experience that is far more satisfying.
* [http://www.soe.ucsc.edu/~milanfar/SR-Software.htm MDSP] — a MATLAB package for super resolution reconstruction from video.
* [http://www.thedeemon.com/articles/what_is_super_resolution.html What is super-resolution?] – an article with step-by-step example of 4x video upsizing using super resolution approach.
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