Apparatus and method for enhancing transient edge of video signal
First Claim
1. An apparatus for enhancing a transient edge of a video signal, comprising:
- transient edge detecting means for first degree-differentiating said video signal, comparing an absolute value of the first degree-differentiated video signal with a reference value, detecting the transient edge of the video signal in accordance with the compared result and outputting a resultant transient edge detection signal;
transient edge dividing means for second degree-differentiating the absolute value of the first degree-differentiated video signal from said transient edge detecting means, third degree-differentiating the second degree-differentiated value and outputting a resultant transient edge divide signal which is divided into interpolation and replacement intervals;
transient edge interpolating means for interpolating a value which is obtained by weighting and averaging start and end pixel values of the transient edge based on the transient edge detection signal from said transient edge detecting means into the transient edge of said video signal in the interpolation interval of the transient edge divide signal from said transient edge dividing means and for replacing start and end pixel values of the transient edge of said video signal with the start and end pixel values of the transient edge based on the transient edge detection signal from said transient edge detecting means in the replacement interval of the transient edge divide signal from said transient edge dividing means; and
mixing means for outputting said video signal in a non-transient edge interval and the interpolated or replaced video signal from said transient edge interpolating means in a transient edge interval.
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Abstract
An apparatus and a method for enhancing a transient edge of a video signal. The enhancement apparatus comprises a transient edge detecting circuit for first degree-differentiating the video signal inputted therein, comparing an absolute value of the first degree-differentiated video signal with a reference value and detecting the transient edge of the video signal in accordance with the compared result, a transient edge dividing circuit for second degree and third degree-differentiating the absolute value of the first degree-differentiated video signal and outputting the resultant transient edge divide signal, a transient edge interpolating circuit for interpolating a value which is obtained by weighting and averaging start and end pixel values of the transient edge based on a transient edge detection signal from the transient edge detecting circuit into the transient edge of the inputted video signal in an interpolation interval and for replacing start and end pixel values of the transient edge of the inputted video signal with the start and end pixel values of the transient edge based on the transient edge detection signal in a replacement interval, and a mixing circuit for outputting the inputted video signal in a non-transient edge interval and the interpolated or replaced video signal in a transient edge interval.
37 Citations
24 Claims
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1. An apparatus for enhancing a transient edge of a video signal, comprising:
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transient edge detecting means for first degree-differentiating said video signal, comparing an absolute value of the first degree-differentiated video signal with a reference value, detecting the transient edge of the video signal in accordance with the compared result and outputting a resultant transient edge detection signal; transient edge dividing means for second degree-differentiating the absolute value of the first degree-differentiated video signal from said transient edge detecting means, third degree-differentiating the second degree-differentiated value and outputting a resultant transient edge divide signal which is divided into interpolation and replacement intervals; transient edge interpolating means for interpolating a value which is obtained by weighting and averaging start and end pixel values of the transient edge based on the transient edge detection signal from said transient edge detecting means into the transient edge of said video signal in the interpolation interval of the transient edge divide signal from said transient edge dividing means and for replacing start and end pixel values of the transient edge of said video signal with the start and end pixel values of the transient edge based on the transient edge detection signal from said transient edge detecting means in the replacement interval of the transient edge divide signal from said transient edge dividing means; and mixing means for outputting said video signal in a non-transient edge interval and the interpolated or replaced video signal from said transient edge interpolating means in a transient edge interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method of enhancing a transient edge of an inputted video signal, comprising the steps of:
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(a) first degree-differentiating said inputted video signal, detecting an absolute value of the first degree-differentiated inputted video signal to form a first degree-differentiated absolute value and detecting the transient edge of the inputted video signal in accordance with the first degree-differentiated absolute value; (b) second degree-differentiating the first degree-differentiated absolute value to form a second degree-differentiated absolute value, third degree-differentiating the second degree-differentiated absolute value to form a third degree-differentiated absolute value and dividing the transient edge into interpolation and replacement intervals in accordance with the third degree-differentiated absolute value; (c) outputting the inputted video signal directly in a non-transient edge interval in which the transient edge is not detected at the step (a) ; (d) replacing start and end pixel values of the transient edge of the inputted video signal with start and end pixel values of the transient edge detected at the step (a) in the replacement interval of the transient edge divided at the step (b); and (e) interpolating a value which is obtained by weighting and averaging the start and end pixel values of the transient edge detected at the step (a) into the transient edge of the inputted video signal in the interpolation interval of the transient edge divided at the step (b).
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Specification