Television – Image signal processing circuitry specific to television – Transition or edge sharpeners
Reexamination Certificate
2000-08-16
2003-12-02
Miller, John (Department: 2614)
Television
Image signal processing circuitry specific to television
Transition or edge sharpeners
C348S607000, C348S627000
Reexamination Certificate
active
06657677
ABSTRACT:
I. BACKGROUND OF THE INVENTION
A. Field of the Invention
The invention relates to the field of image enhancement.
B. Related Art
U.S. Pat. No. 5,666,164 shows an image enhancement technique for conversion from standard definition (“SD”) to high definition television (“HDTV”) signals.
II. SUMMARY OF THE INVENTION
It is an object of the invention to achieve further improvement with respect to image enhancement.
This object is achieved through a device that includes an edge detection unit, a non-linear enhancement unit for enhancing edges detected by the edge detection unit, and a linear enhancement device for enhancing non-edge areas identified by the edge detection unit.
Advantageously the linear device is a peaking unit. Also advantageously the non-linear device is an LTI unit.
Preferably the LTI unit is a sub-pixel level unit.
The device according to the invention can be used to improve SD to HDTV conversion.
Further objects and advantages will be apparent from the following.
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“Rational Unsharp Masking Technique”, by G. Ramponi et al., Journal of Electronic Imaging.
“Edge Detection”, by A.K. Jain, Fundmentals of Digital Image Processing.
“De-Interlacing- an Overview”, by G. de Haan et al., Proceedings of the IEEE.
US 000057, U.S. Ser. No. 09/519,548, Filed Mar. 6, 2000.
US 000010, Method and Apparatus for Edge Detection, filed concurrently herewith.
US 000058, System and Method for Improving the Sharpness of a Video Image, filed concurrently herewith.
He Haiyan
Janssen Johan Gerard Willem Maria
Gathman Laurie E.
Koninklijke Philips Electronics , N.V.
Miller John
Tran Trang U.
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