Device and method for decoding television video signal

#1. Field of the Invention

#The present invention relates to device and method for decoding a television video signal which influences to a picture quality of a television video.

#2. Background of the Related Art

#The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention:

#In the drawings:

#FIG. 1 illustrates a diagram showing a system of a decoder having a tint control function in accordance with a preferred embodiment of the present invention;

#Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Decoder and decoding method for controlling a tint by using a CSC (Color Space Converter) of the present invention will be explained, with reference to FIGS. 1˜3. FIG. 1 illustrates a diagram showing a system of a decoder having a tint control function in accordance with a preferred embodiment of the present invention.

#Referring to FIG. 1, the decoder having a tint control function in accordance with a preferred embodiment of the present invention includes a tint controller 1 and a CSC 2. The tint controller 1 converts a plurality of original CSC coefficients into coefficients having a tint control taken into account by using the plurality of original CSC coefficients, sine theta values, and cosine theta values. The detailed operation of the tint controller 1 will be explained, later. On the other hand, the CSC 2 converts Y, Cb, Cr color space components to R, G, B color space components for display on a monitor. Functions of the tint controller 1 and the CSC 2 will be described more. Both the tint controller 1 and the CSC 2 use the fact that a digital televison video signal is processed into a luminance signal component Y and chrominance signal component C for easy compression and reproduction. The present invention utilizes this fact.

#Human eyes are sensitive to a luminance signal component Y more than a chrominance signal component ‘C’. Therefore, in processing the television video signal, more attention is paid to the luminance signal component ‘Y’ than the chrominance signal component ‘C’. Accordingly, in processing the digital television video signal, of numerous color spaces, a YCbCr color space is selected. In general, since a final output terminal of the monitor receives a RGB color space mostly, the television video signal processed in the YCbCr color space is converted into a video signal of the RGB color space component through the CSC 2. Equations (1), (2), and (3) below are according to ITU BT. 709 standards which are used widely as international standards.