Apparatus and method for compensating image signal
AssigneeLG Electronics Inc.
InventorSang Yeon Kim
Life of this patent
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Abstract
An apparatus and method for eliminating noise of a received image and compensating its sharpness is provided. A common circuit is used in a structure for eliminating noise based on a double smoothing method and a structure for making the outline sharp based on an unsharp masking method. Noise elimination and sharpness enhancement are processed for a difference signal between an original signal of the image and its low pass filtered signal, thereby compensating the original signal. Thus, an image having an improved picture quality can be provided in a product which transmits/receives or displays image data, and high competitiveness of the product can be obtained by simplifying the user interface.
Claims12
An apparatus for compensating an image signal comprising:
- a first filter for low pass filtering an input signal;
- a subtractor for obtaining a difference signal between the input signal and the low pass filtered signal;
- a noise eliminating unit for eliminating noise while preserving high frequency components of an image from the difference signal;
- a multiplier for multiplying an output of the noise eliminating unit by a constant (α+1);
- and
- an adder for adding the low pass filtered signal to the output of the multiplier.
A method for compensating an image signal comprising the steps of:
- low pass filtering an input signal;
- obtaining a difference signal between the input signal and the low pass filtered signal;
- eliminating noise only while preserving high frequency components of an image from the difference signal;
- multiplying the difference signal having no noise by a constant (α+1);
- and
- adding the low pass filtered signal to the multiplied signal.
Dependencies are inferred from the claim text.