Topic
Subpixel rendering
About: Subpixel rendering is a research topic. Over the lifetime, 3885 publications have been published within this topic receiving 82789 citations.
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24 Mar 2008
TL;DR: The limit of intesimally small anomaly turns out to be well- defined, and provides a new parameter-free anomalous change detector which is effective over a range of subpixel anomalies, and continues to have reasonable power against the full-pixel case.
Abstract: A machine-learning framework for anomalous change detection is extended to the situation in which the anomalous change is smaller than a pixel. Although the existing framework can be applied to (and does have power against) the subpixel case, it is possible to optimize that framework for the subpixel case when the size of the anomalous change is known. The limit of intesimally small anomaly turns out to be well- defined, and provides a new parameter-free anomalous change detector which is effective over a range of subpixel anomalies, and continues to have reasonable power against the full-pixel case.
15 citations
TL;DR: A computationally inexpensive method for estimation of p from the raw data is proposed and illustrated with simulations, which results in an accurate p estimation for all the illumination patterns and subsequently improves the superresolution image recovery by a factor of 10 around sharp edges as compared to an integer pixel approach.
Abstract: Structured illumination microscopy is able to improve the spatial resolution of wide-field fluorescence imaging by applying sinusoidal stripe pattern illumination to the sample. The corresponding computational image reconstruction requires precise knowledge of the pattern's parameters, which are its phase (ϕ) and wave vector (p). Here, a computationally inexpensive method for estimation of p from the raw data is proposed and illustrated with simulations. The method estimates p through a selective discrete Fourier transform at tunable subpixel precision. This results in an accurate p estimation for all the illumination patterns and subsequently improves the superresolution image recovery by a factor of 10 around sharp edges as compared to an integer pixel approach. The technique as presented here is of major interest to the large variety of custom-build systems that are used. The feasibility of the presented method is proven in comparison with published data.
15 citations
TL;DR: A local-neighborhood pixel-based adaptive algorithm to track image features, both spatially and temporally, over a sequence of monocular images and it is shown how the algorithm has been used to extract the Focus of Expansion and to compute the time-to-contact using real image sequences of unstructured, unknown environments.
15 citations
TL;DR: In this article, the authors measured a root mean square charge cloud size of 1 to 2 /spl mu/m for X-rays of Y-L (1.9 keV), Ag-L and Ti-K (4.5 keV).
Abstract: The authors report here experimental results relating X-ray interaction location and event splitting. The X-ray interaction location can be localized at subpixel scale using the mesh technique. The authors found that the center of gravity of the split event is well-correlated with the X-ray interaction location. They analyzed the data using two models for the charge cloud shape: one is the rectangular model and the other is the Gaussian model. Although the authors could not distinguish between these models, they measured a root mean square charge cloud size of 1 to 2 /spl mu/m for X-rays of Y-L (1.9 keV), Ag-L (3.0 keV), and Ti-K (4.5 keV). When the X-rays enter near the pixel boundary, the charge splits into adjacent pixels, allowing determination of the X-ray interaction location with an accuracy of 1.5 to 2.2 /spl mu/m. The authors, therefore, expect that the X-ray CCD can function as an X-ray imager with subpixel resolution, which will be especially useful in applications involving very high spatial resolution optics.
15 citations
Patent•
23 Mar 2009TL;DR: In this article, a method for interpolating a subpixel at an interpolation position, which is situated in the chronological order between two source frames, is presented, where the calculation of the interpolated subpixel's value is based on the value of the pixels of the two source images and additional weighting coefficients, which are based on motion vectors correlating the two image frames.
Abstract: The present invention relates to a method for interpolating a subpixel at an interpolation position, which is situated in the chronological order between two source frames. Thereby the calculation of the interpolated subpixel's value is based on the value of the pixels of the two source frames and additional weighting coefficients, which are based on the motion vectors correlating the two source frames.
15 citations