Subpixel rendering

About: Subpixel rendering is a research topic. Over the lifetime, 3885 publications have been published within this topic receiving 82789 citations.

Unsupervised Subpixel Mapping of Remotely Sensed Imagery Based on Fuzzy C-Means Clustering Approach

Abstract: Subpixel mapping (SPM) is a technique to obtain a land cover map with finer spatial resolution than the original remotely sensed imagery. An image-based SPM model that directly uses the original image data as input by integrating both the spectral and spatial information has been demonstrated as a promising SPM model. However, all existing image-based SPM models are based on a supervised approach, since the spectral term in these SPM models is composed of a supervised unmixing method. The endmembers and training samples for different land cover classes must be determined before implementing these supervised SPM algorithms. In this letter, a novel unsupervised image-based SPM model based on the fuzzy c-means (FCM) clustering approach (usFCM_SPM) was proposed. By incorporating the unsupervised unmixing criterion of the FCM clustering algorithm and the maximal land cover spatial-dependence principle, the proposed usFCM_SPM can generate a subpixel land cover map without any prior endmember information. Both synthetic multispectral image and real IKONOS image experiments demonstrate that the usFCM_SPM can generate higher accuracy subpixel land cover maps than the traditional unsupervised pixel-scale classification approaches and the unsupervised pixel-swapping model.

Image display device, display panel, and terminal device

Abstract: A subpixel 4 S has a parallelogram aperture, which is equivalent upon rotation by 180 degrees in a XY plane and asymmetric about a line R-R′ or L-L′ parallel to the Y-axis and passing through the center Or or Ol of the subpixel. The subpixels 4 S adjacent to each other in the X-axis direction in a unit of display 4 U are point-symmetric about the center Ou of the unit of display 4 U. The apertures of a right-eye pixel 4 R and left eye pixel 4 L have the centers Or and Ol around the intersections of the diagonals of their respective parallelograms, respectively. The centers Or and Ol are shifted from a line E-E′ to be away from each other in the Y-axis direction.

Super resolution: an overview

Abstract: : Super-resolution algorithms produce a single high-resolution image from a set of several, low-resolution images of the desired scene. The low-resolution frames are shifted differently with respect to the high resolution frame with subpixel increments. This paper presents first a theoretical overview of super-resolution algorithms. The most important methods, namely, the iterative back-projection, projection onto convex sets, and maximum a posteriori estimation are then compared within the same framework of implementation.

Method and apparatus for anti-aliasing using floating point subpixel color values and compression of same

Abstract: The present invention provides a method and apparatus for data compression that includes representing each sub-pixel of each pixel with a pointer corresponding to an attribute of the sub-pixel, the attribute being a floating point binary number. An overall attribute of each pixel is then determined. The determining of the overall attribute of each tile may include any one of assigning the attribute of the sub-pixels to the overall attribute of the pixel when the sub-pixels are represented by an identical pointer, and resolving the overall attribute of the tile by the attributes of the sub-pixels when the sub-pixels are represented by non-identical pointers of the pixel.

A Unified Method for Crosstalk Reduction in Multiview Displays

Abstract: The slanted lenticular sheet-based multiview display usually suffers both extrinsic crosstalk resulting from fabrication errors or assembling errors and intrinsic crosstalk originating from the leaked light from the two closest neighboring views. In this paper, a unified method is proposed to eliminate the extrinsic crosstalk and alleviate the intrinsic crosstalk simultaneously by adjusting the predefined view index (i.e., the corresponding viewpoint number) and grayscale intensity of each LCD subpixel. Two sets of patterns are utilized: structured light patterns are applied for building the correspondence between LCD subpixels and the captured photos pixels, and intensity test images are used for determining the brightness of LCD subpixels observed at given viewing points. Then the optimal view index for each LCD subpixel can be obtained for extrinsic crosstalk elimination according to the calculated correspondence and the estimated subpixel brightness. Moreover, the crosstalk coefficients for each subpixel can also be computed according to the correspondence and brightness, which are used for intrinsic crosstalk reduction. Experimental results prove the effectiveness of our method.