Digital video processing apparatus and control method thereof

1. A digital video processing apparatus, comprising:

a signal receiving part for receiving a digital video signal;

a decoder for separating a luminance signal from the digital video signal;

a filtering part for filtering the luminance signal separated by the decoder to substantially remove an interference signal contained in the luminance signal; and

a controlling part for determining a gain variation of the luminance signal for each frame and controlling the filtering part such that a region of the luminance signal to filter is adjusted based on the determined gain variation.

2. The digital video processing apparatus according to claim 1 , further comprising:

a displaying part,

wherein the filtering part outputs the digital video signal based on the filtered luminance signal to the displaying part.

3. The digital video processing apparatus according to claim 2 , wherein the filtering part comprises at least one of a low pass filter and a notch filter.

4. The digital video processing apparatus according to claim 2 , wherein the filtering part comprises:

at least one of a low pass filter and a notch filter; and

a controlling part for determining a gain variation of the luminance signal for each frame and controlling one of the low pass filter and the notch filter included in the filtering part to filter the luminance signal based on the determined gain variation.

5. The digital video processing apparatus according to claim 4 , wherein the controlling part comprises:

a motion determining part for determining motion of an object between respective frames and the controlling part determines the gain variation of the luminance signal based on a result of the determination of the motion determining part.

6. The digital video processing apparatus according to claim 1 , wherein the controlling part comprises:

a motion determining part for determining motion of an object between respective frames and the controlling part determines the gain variation of the luminance signal based on a result of the determination of the motion determining part.

7. The digital video processing apparatus according to claim 1 , wherein the interference signal comprises a remaining color difference signal component contained in the luminance signal after separation in the decoder.

8. The digital video processing apparatus according to claim 7 , wherein the filtering part is configured to filter the color difference signal component from the luminance signal separated in the decoder to substantially remove the interference signal contained in the luminance signal.

9. A method of controlling a digital video processing apparatus, comprising:

receiving a digital video signal;

separating a luminance signal from the digital video signal; and

filtering the separated luminance signal to substantially remove an interference signal contained in the luminance signal;

wherein the filtering of the separated luminance signal comprises:

determining a gain variation of the luminance signal for each frame; and

adjusting a region of the luminance signal to filter based on the determined gain variation.

10. The method according to claim 9 , wherein the filtering of the separated luminance signal comprises:

passing only the luminance signal having a predetermined frequency.

11. The method according to claim 9 , wherein the filtering of the separated luminance signal comprises:

determining motion of an object between frames; and

determining the gain variation of the luminance signal based on the determined motion of the object.

12. The method according to claim 9 , wherein the interference signal comprises a remaining color difference signal component contained in the luminance signal after separation in the decoder.

13. The method according to claim 9 , wherein the filtering of the separated luminance signal comprises:

filtering the color difference signal component from the luminance signal separated in the decoder to substantially remove the interference signal contained in the luminance signal.

14. A method of controlling a digital video processing apparatus, comprising:

receiving a digital video signal;

separating a luminance signal from the digital video signal, wherein a remaining color difference signal component is contained in the luminance signal after separation; and

filtering the separated luminance signal to substantially remove the remaining color difference signal component contained in the luminance signal,

wherein the filtering of the separated luminance signal comprises:

determining a gain variation of the luminance signal for each frame; and

adjusting a region of the luminance signal to filter based on the determined gain variation.