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Subpixel rendering

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


Papers
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Proceedings ArticleDOI
01 Jun 2000
TL;DR: A template-matching method in which a parametric template space is constructed from a given set of template images then quickly matched to a reference image that yields a high-precision estimation of the object position is proposed.
Abstract: We propose a template-matching method in which a parametric template space is constructed from a given set of template images then quickly matched to a reference image. In this method geometrical changes in an image object due to translation, rotation or scaling, and non-geometrical changes such as illumination variations or individual variation between objects are represented by template images in the parametric template space. The method also provides a subpixel matching scheme that yields a high-precision estimation of the object position. Experiments using real images have confirmed the effectiveness of the method.

38 citations

Journal ArticleDOI
TL;DR: The authors present a new approach to automated optical inspection (AOI) of circular features that combines image fusion with subpixel edge detection and parameter estimation that shows greatest improvement over traditional methods in cases where the feature size is small relative to the resolution of the imaging device.
Abstract: The authors present a new approach to automated optical inspection (AOI) of circular features that combines image fusion with subpixel edge detection and parameter estimation. In their method, several digital images are taken of each part as it moves past a camera, creating an image sequence. These images are fused to produce a high-resolution image of the features to be inspected. Subpixel edge detection is performed on the high-resolution image, producing a set of data points that is used for ellipse parameter estimation. The fitted ellipses are then back-projected into 3-space in order to obtain the sizes of the circular features being inspected, assuming that the depth is known. The method is accurate, efficient, and easily implemented. The authors present experimental results for real intensity images of circular features of varying sizes. Their results demonstrate that their algorithm shows greatest improvement over traditional methods in cases where the feature size is small relative to the resolution of the imaging device.

38 citations

Patent
22 Feb 2001
TL;DR: In this article, a liquid crystal display (LCD) element with defect repairing function and defect repairing method of the same is presented, where a pixel is associated with a plurality of scan lines and a plethora of data lines.
Abstract: A liquid crystal display (LCD) element with a defect repairing function and a defect repairing method of the same. In an embodiment of the invention, a pixel is associated with a plurality of scan lines and a plurality of data lines. Along with separate spare lines, melting connection can be obtained to form a circuit path and to compensate for broken wires. A single pixel can also have a plurality of subpixels with spare conduction ports and meltable joints so that defective electrodes can be separated. The spare conduction ports can be melted and connected so that other subpixels support and compensate for the defective subpixel to minimize pixel signal loss.

38 citations

Journal ArticleDOI
TL;DR: In this article, the inherent accuracy of the methods and the effects of various sources of error, such as noise, bias mismatch, and blurring, were evaluated and the best methods for shift measurements were based on the square difference function and the absolute difference function squared, with subpixel accuracy accomplished by use of two-dimensional quadratic interpolation.
Abstract: Context. Solar Shack–Hartmann wavefront sensors measure differential wavefront tilts as the relative shift between images from different subapertures. There are several methods in use for measuring these shifts. Aims. We evaluate the inherent accuracy of the methods and the effects of various sources of error, such as noise, bias mismatch, and blurring. We investigate whether Z-tilts or G-tilts are measured. Methods. We test the algorithms on two kinds of artificial data sets, one corresponding to images with known shifts and one corresponding to seeing with different r0. Results. Our results show that the best methods for shift measurements are based on the square difference function and the absolute difference function squared, with subpixel accuracy accomplished by use of two-dimensional quadratic interpolation. These methods measure Z-tilts rather than G-tilts.

38 citations

Journal ArticleDOI
TL;DR: The results suggest that subpixel water fractions can be accurately estimated when high-resolution satellite data or intensively interpreted training datasets are not available, which increases the ability to map small water bodies or small changes in lake size at a regional scale.
Abstract: Small bodies of water can be mapped with moderate-resolution satellite data using methods where water is mapped as subpixel fractions using field measurements or high-resolution images as training datasets. A new method, developed from a regression-tree technique, uses a 30 m Landsat image for training the regression tree that, in turn, is applied to the same image to map subpixel water. The self-trained method was evaluated by comparing the percent-water map with three other maps generated from established percent-water mapping methods: (1) a regression-tree model trained with a 5 m SPOT 5 image, (2) a regression-tree model based on endmembers and (3) a linear unmixing classification technique. The results suggest that subpixel water fractions can be accurately estimated when high-resolution satellite data or intensively interpreted training datasets are not available, which increases our ability to map small water bodies or small changes in lake size at a regional scale.

38 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202387
2022209
2021120
2020179
2019189
2018263