Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Reexamination Certificate
1999-04-23
2001-07-10
Luu, Matthew (Department: 2672)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
C345S182000, C345S428000, C358S445000
Reexamination Certificate
active
06259427
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to image signal processing and to systems for displaying images. More particularly, this invention relates to scaling image signals from a first resolution to a second resolution.
2. Description of the Background Art
Various resolutions are utilized to display digital images. For computer monitors, common display resolutions currently include VGA (video graphics array), XGA (extended graphics array), SVGA (super video graphics array), and other display standards. VGA displays typically have a resolution of 640×480 (horizontal x vertical) pixels. SVGA displays typically have a resolution of 800×600 pixels. XGA displays typically have a resolution of 1024×768 pixels. SXGA displays typically have a resolution of 1280×1024 pixels.
It often occurs in computer-related applications that a digital image must be scaled from one resolution to another resolution. Scaling an image from one resolution to another resolution may be thought of as changing the sampling rate of the image. Scaling of an image signal would be necessary, for example, when a change is made in the resolution at which a display monitor is being operated. For instance, a computer user may change (by way of a function in the Windows operating system) the display resolution from VGA to XGA (or vice-versa) in the middle of a session. Another example where such scaling would be necessary is when an image having a certain resolution is to be printed on a printer having a different resolution.
SUMMARY OF THE INVENTION
The present invention provides a particularly efficient and effective method for scaling image signals from a first resolution to a second resolution. In accordance with the present invention, an image or other multi-dimensional data set may have its sampling rate changed by determining weighting factors for the values of points in the original (input) data set used to calculate the value of a point in the new (output) data set. The weighting factors are determined using a function, such as a Gaussian function, that takes as input the relative location of the point in the new data set with respect to the locations of surrounding (neighboring) points in the original data set. The values of the points in the original data set are multiplied by the weighting factors, and the resultant products are added (or combined by another function) to give a value of the point in the new data set. In particular, when the input and output data sets are regularly spaced, such as with pixels for computer displays, the locations of the surrounding points and thus their weights repeat periodically. This results in increased efficiency because the surrounding points and their weights need to be determined only for a subset of the output data set.
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Martin Russel A.
Tan Ken-Sue
Fenwick & West LLP
Havan Thu-Thao
Luu Matthew
Silicon Image Inc.
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