US 8,411,207 B1 · Device for outputting luminance signal and method thereof

Abstract

A device for outputting a luminance signal and a method thereof are disclosed. The device includes an image smoothing unit, a band pass filter unit, and a summing unit. The image smoothing unit receives a 2D luminance signal and decreases a signal intensity of a component of the 2D luminance signal within a frequency range with respect to a carrier frequency of a chrominance component. The band pass filter unit passes the component of the 2D luminance signal within the frequency range with respect to the carrier frequency. The summing unit sums the output of the image smoothing unit and the output of the band pass filter unit to generate a resultant luminance signal. The present invention is capable of avoiding the occurrence of saw-tooth or sparkling situation caused by inharmonious switching between a 1D comb filter and a 2D comb filter.

Claims16

Dependent claims

A device for outputting a luminance signal in an image processing system, in the system, a composite video signal having a chrominance component and a luminance component, a 2D comb filter receiving the composite video signal of a frame and outputting a 2D luminance signal based on the luminance component, the chrominance component being modulated onto a carrier frequency, the device comprising:

an image smoothing unit, receiving the 2D luminance signal and decreasing a signal intensity of a component of the 2D luminance signal within a frequency range with respect to the carrier frequency of the chrominance component;
a band pass filter unit, passing the component of the 2D luminance signal within the frequency range with respect to the carrier frequency while filtering out the other components of the 2D luminance signal;
and
a summing unit, summing the output of the image smoothing unit and the output of the band pass filter unit to generate a resultant luminance signal.

1 more element

A method for outputting a luminance signal in an image processing system, in the system, a composite video signal having a chrominance component and a luminance component, a 2D comb filter receiving the composite video signal of a frame and outputting a 2D luminance signal based on the luminance component, the chrominance component being modulated onto a carrier frequency, the method comprising:

decreasing a signal intensity of a component of the 2D luminance signal within a frequency range with respect to the carrier frequency of the chrominance component;
passing the component of the 2D luminance signal within the frequency range with respect to the carrier frequency while filtering out the other components of the 2D luminance signal;
and
summing the 2D luminance signal of which the signal intensity is decreased and the component of the 2D luminance signal within the frequency range with respect to the carrier frequency to generate a resultant luminance signal.

1 more element

Dependencies are inferred from the claim text.

Device for outputting luminance signal and method thereof

Life of this patent

Device for outputting luminance signal and method thereof

Life of this patent

Abstract

Claims16