Television – Format conversion – Line doublers type
Reexamination Certificate
1998-09-14
2001-03-27
Lee, Michael (Department: 2714)
Television
Format conversion
Line doublers type
C348S443000, C348S449000, C348S450000, C348S451000, C348S452000, C348S458000
Reexamination Certificate
active
06208382
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to processing and display of television signals and, more particularly, to an improved method and apparatus for receiving an interlaced color video signal and processing the received signal to produce a progressively scanned video signal.
BACKGROUND OF THE INVENTION
In my Published PCT Patent Application WO 98/16068, there is disclosed a type of camera that uses two image sensors and can produce an output of 1920×1080 pixels in color progressively scanned at 60 frames per second. [see, also, W. E. Glenn, and J. W. Marcinka, “1920×1080 Pixel Color Camera With A Progressive Scan Output AT 60 FPS,” invited paper presented at SMPTE Technical Conference, New York, N.Y., Nov. 22, 1997.] This is the “top” format in the SMPTE 274M standard. Using progressive scan rather than interlace has been a long-term objective for program production for many years. Progressive scan is widely used in computers having high definition displays. As television and computer practices converge, progressive scan display becomes more desirable. Displays such as plasma panels and light valve systems require progressive scan if they are to have full brightness and optimum motion rendition. Such displays are becoming increasingly important for high definition television.
In operation of the referenced camera system, one sensor in the camera is a color stripe filter sensor that is scanned interlaced two lines at a time to produce the color signals and low resolution luminance. Within the camera, the top octave of detail is scanned out of a second sensor at 30 frames per second. An interlaced camera also takes {fraction (1/30)} second to produce the top octave of vertical detail. Both cameras produce all other spatial frequencies at 60 frames per second. Consequently, motion rendition for the referenced camera is the same as that of an interlaced camera. This was verified subjectively by comparing the two types of cameras at 525 lines where cameras were commercially available and progressively scanned at 60 frames per second. [See, W. E. Glenn, and J. W. Marcinka, “The Development Of 1080×1920 Pixel Color CCD Camera Progressively Scanned At 60 Frames Per Second,” invited paper presented at SMPTE Technical Conference, Los Angeles, Calif., Oct. 9, 1996.]
The 1080P image derived from the referenced camera system does not have the interlace artifacts, and there is no interline flicker or line crawl. The vertical resolution is 1000 lines on a test chart, as compared with 700 lines for an interlaced camera.
In order to transmit a video signal that is within existing ATSC transmission standards, the output of the referenced camera system can be converted to interlaced format (e.g. to 1080I).
It is among the objects of the present invention to provide a method and apparatus for processing an interlaced signal, such as the converted 1080I signal, to produce a progressively scanned video signal.
SUMMARY OF THE INVENTION
The present invention is directed to a method and apparatus for receiving an interlaced color video signal, and processing the signal to produce a progressively scanned video signal. An embodiment of the method of the invention includes the following steps: scan converting, by field combining and high pass filtering, the luminance component of the received signal, to obtain a progressively scanned high pass luminance component; deriving, from the luminance component of the received signal, a low pass luminance component; scan converting, by line rate conversion, to progressively scanned format, the chrominance components of the received signal and the low pass luminance component; and combining the progressively scanned low and high pass luminance components.
In a form of the invention, the step of deriving, from the luminance component of the received signal, a low pass luminance component, comprises scan converting the progressively scanned high pass luminance component to an interlaced scanned high pass luminance component, and subtracting the interlaced scanned high pass luminance component from the luminance component of the received signal to obtain the low pass luminance component.
In a preferred embodiment of the invention, the line rate conversion comprises repeating each line, or interpolated lines, two times at twice the original clock rate of the line. In this embodiment, the scan converting, by field combining, to progressive format, includes clocking out at a higher rate than is used for clocking in.
Also in a preferred embodiment of the invention, the received interlaced color signal includes received red and blue chrominance components, C
R
and C
B
, respectively, and a received luminance component, Y, and the progressively scanned video signal includes, as an output luminance component, the combined low pass and high pass luminance components, and, as output chrominance components, the scan converted red and blue chrominance components.
Further features and advantages of the invention will become more readily apparent from the following detailed description when taken in conjunction with the accompanying drawings.
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Florida Atlantic University
Lee Michael
Novack Martin
Yenke Brian P.
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