Television – Format conversion – Line doublers type
Reexamination Certificate
1999-08-31
2002-10-01
Miller, John (Department: 2614)
Television
Format conversion
Line doublers type
C348S441000, C348S448000
Reexamination Certificate
active
06459455
ABSTRACT:
BACKGROUND OF THE
1
INVENTION
1. Field of the Invention
The present invention relates to video display systems. More particularly, the present invention relates to a method of deinterlacing a video signal.
2. The Background
Displaying video content that was originally created for television, on a computer display would be a useful feature of a multi-media computer system. However, television video signals and the video formats of most computer displays are not the same.
Computers commonly use a noninterlaced video display format, also called a progressive scan. That is, an entire frame is scanned line-by-line, typically from top to bottom. The process repeats and re-scans the entire frame at a given refresh rate, for example, 75 Hz. In contrast, many sources of consumer video, such as television signals, use an interlaced display format. Interlaced systems interleave two or more fields to display an entire frame. A typical U.S. NTSC television signal uses two fields, each with video data for every other horizontal line of the entire frame, and consecutively scans the two fields 30 times per second. The viewer perceives the resulting image as a blend of the two individual fields with an effective refresh rate of 60 Hz. If instead, the entire frame was scanned progressively at 30 Hz, the viewer might perceive a flicker of the displayed image. The flicker is much less apparent with higher refresh rates such as 60 Hz. The interlaced format thus reduces flicker without requiring a doubling of the data transfer rate needed to update the entire frame at 60 Hz. Other interlaced video formats are also common, such as the 50 Hz phase alternation line (PAL) system used in Europe. All such interlaced formats use the technique of interleaving fields to create an entire frame, and the present invention is not intended to be limited to deinterlacing any particular interlaced video format.
Modern computer systems are not constrained by data transfer rates required for the noninterlaced format to the same extent as were early television systems. However, the use of interlaced display formats for many consumer video products is common and unlikely to disappear soon. In order to display this interlaced material on a noninterlaced computer display there is a need for deinterlacing.
SUMMARY OF THE INVENTION
A method and apparatus for deinterlacing video frames selects a location for deinterlacing, and measures motion at that location. A deinterlacing method is selected based on the measured motion. A pixel value is created for the location.
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Jiang Hong
Tran David Huu
Tsui Ernest Tinyork
Vasquez Maximino
Intel Corporation
Miller John
Thelen Reid. & Priest LLP
Tran Trang U.
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