Device and method for sharpening image signal

Details Device and method for sharpening image signal Device and method for sharpening image signal

2006-02-15

2009-08-18

Poon, King Y (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S002100, C358S003150, C358S532000, C382S254000, C382S199000, C382S266000

Reexamination Certificate

active

07576894

ABSTRACT:
A device for sharpening an image signal for receiving an image signal input, detecting and sharpening the object edge of the image signal input by using a detection period, and outputting an image signal output is provided. The image signal sharpening device determines the switching point of a maximum value signal and of a minimum value signal within the detection period through a switch-point generator and sharpens the image signal input through a signal processing unit. Therefore, the device can enhance the contrast of the edge of the object image and improve image sharpness without causing an overshoots or undershoots of the image amplitude. In addition, a confidence checking unit can be used to ensure the correct detection of the edge of the object image.

REFERENCES:
patent: 5926578 (1999-07-01), Fukase et al.
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patent: 6690429 (2004-02-01), Kim
patent: 6873741 (2005-03-01), Li
patent: 2004/0223662 (2004-11-01), Urano et al.

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