Subpixel rendering

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

Moment-preserving edge detection and its application to image data compression

Abstract: In contrast to the numerous edge-detection techniques that detect edges either point by point or using overlapping circular windows, an edge detector using nonoverlapping rectangular windows is proposed. The detector examines the pixels within each rectangular window of an image, and decides whether an edge element is present or not in the window. Based on the gray and mass moment-preserving principles, the step edge is estimated locally to subpixel accuracy using analytical formulas. To apply the edge detection results to image compression, the detected edge elements are then tracked and grouped based on proximity and orientation. Using the line parameters of the grouped edge elements, region boundaries are approximated in a piecewise linear manner. This reduces the amount of data required to describe region shapes and is useful for compressing some types of images. Good experimental results of compressing character and trademark images are also included to show the feasibility of the proposed approach.

Liquid crystal panel and liquid crystal display device

Abstract: A vertical alignment liquid crystal panel based on a transverse electric field drive system is provided which shows few changes in color when looked squarely at. A liquid crystal panel (2) is a vertical alignment liquid crystal panel based on a transverse electric field drive system, which carries out a display by driving, with a transverse electric field, a liquid crystal layer (50) sandwiched between substrates (10, 20), and the substrate (10) is provided with an insulating layer (25) having at least two regions that are different in relative permittivity from each other in a pixel (6) composed of a red subpixel (6R), a green subpixel (6G), and a blue subpixel (6B). Those regions of the insulating layer (25) which correspond to the blue, green, and red subpixel (6B, 6G, 6R) in the liquid crystal panel (2) have relative permittivities of 3, 3 to 7, and 4 to 7, respectively.

Subpixel measurement of image features based on paraboloid surface fit

Abstract: A digiuil image processing inspection system is under development at Oak Ridge National Laboratory that will locateimage features on printed material and measure distances between them to accuracies of 0.001 in. An algorithm has beendeveloped for this system that can locate unique image features to subpixel accuracies. It is based on a least-squares fit ofa paraboloid function to the surface generated by correlating a reference image feature against a test image search area.Normalizing the correlation surface makes the algorithm robust in the presence of illumination variations and local flaws.Subpixel accuracies of better than 1/16 of a pixel have been achieved using a variety of different reference image features. 1. INTRODUCTIONAn algorithm has been developed at Oak Ridge National Laboratory (ORNL) that can be used to locate a variety offeatures or objects in a digitized image to subpixel accuracies. The algorithm uses a set of normalized correlation j1 generated by correlating a stored reference template against a test image search area that is believed to contain the feature

Resolution Enhancement in Multi-Image Stereo

Abstract: Under stereo settings, the twin problems of image superresolution (SR) and high-resolution (HR) depth estimation are intertwined. The subpixel registration information required for image superresolution is tightly coupled to the 3D structure. The effects of parallax and pixel averaging (inherent in the downsampling process) preclude a priori estimation of pixel motion for superresolution. These factors also compound the correspondence problem at low resolution (LR), which in turn affects the quality of the LR depth estimates. In this paper, we propose an integrated approach to estimate the HR depth and the SR image from multiple LR stereo observations. Our results demonstrate the efficacy of the proposed method in not only being able to bring out image details but also in enhancing the HR depth over its LR counterpart.

OLED device with improved power consumption

Abstract: A method for making an OLED device, comprising: providing a plurality of subpixels of different colors, including at least three gamut-defining subpixels, each subpixel requiring an operating voltage which is based on the maximum current density required by that subpixel; selecting the display operating voltage to be equal to or greater than the maximum required subpixel operating voltage; and selecting the area of the subpixels to reduce the maximum required subpixel operating voltage, thereby reducing the display operating voltage so as to reduce power consumption in the device.