Merely upsampling does not give you super spatial resolution. If you just replicate pixels you have more pixels but the image is no clearer and you are not able to resolved smaller details in the scene.
If you want to look at super resolution though, check out http://iris.usc.edu/Vision-Notes/bibliography/contentsmotion-i.html#Motion%20Analysis%20--Low-Level,%20Image%20Level%20Analysis,%20Mosaic%20Generation,%20Super%20Resolution,%20Shape%20from%20Motion
18.4.3 Super Resolution or Superresolution
18.4.3.1 Single Image Super Resolution
18.4.3.2 Super Resolution Analysis Using Edges, Edge Analysis for Superresolution
18.4.3.3 Range Data Super Resolution, Depth Super Resolution
18.4.3.4 Creating Super Resolution Image from Video
18.4.3.5 Super Resolution for Face Images, Facial Image Super Resolution
18.4.3.6 Super Resolution using Wavelets
18.4.3.7 Super Resolution, Survey, Evaluation, Overviews
18.4.3.8 Image Manipulation -- Expansion, Zoom, Magnification
18.4.3.8.1 Image Manipulation, Image Interpolation -- Interpolation Operations
18.4.3.9 Image Manipulation -- Sampling, Reduction, Decimation, General Size Changes, Resizing
18.4.3.10 HDR, High Dynamic Range, Enhanced Dynamic Range from Multiple Images
18.4.3.11 Super Resolution and Restoration from Blurred Images, Motion Blur
18.4.3.12 Deblurring, Gaussian Blur
18.4.3.13 Super Resolution, Restoration, for Atmosphere Effects, Turbulence
18.4.3.14 Super Resolution for Remote Sensing Applications
18.4.3.15 Video Image Restoration and Enhancement
18.4.3.16 Video Super-Resolution, Resolution Enhancement
