Video signal processor and TV receiver using the same

A video signal processor comprising:

• a first motion detection unit for finding a difference between a luminance signal included in a predetermined composite video signal in a current frame and a luminance signal included in a composite video signal in a past frame having a predetermined time interval and outputting a first motion detection signal in accordance with the difference;
• a second motion detection unit for extracting luminance signals included in three composite video signals in said current frame based on three composite video signals having a predetermined interval in a vertical direction in said current frame and three predetermined composite video signals in the vertical direction at the same position in said past frame, detecting the correlation of color signal components remaining in the extracted video signals, and outputting a second motion detection signal in accordance with the result of the detection;
• a color signal difference calculating means for calculating a difference of absolute values of color signals in the current frame calculated based on said three composite video signals in said current frame and color signals in the past frame calculated based on the composite video signals of said past frame;
• a first selecting means for selecting the difference of said color signals calculated by said color signal difference calculating means when said first motion detection signal indicates that there is motion and selecting an intended first value indicating that there is no motion when said first motion detection signal indicates that there is no motion;
• a second selecting means for selecting an intended second value indicating that there is motion when said second motion detection signal indicates that there is motion and selecting the output signal of said first selecting means when said second motion detection signal indicates that there is no motion;
• and
• a motion coefficient generating means for outputting the motion coefficient indicating motion in accordance with the value selected by said second selecting means.

A TV receiver for judging motion of an image in accordance with a motion coefficient generated based on a composite video signal, separating a luminance signal and a color signal from said composite video signal by using a frame comb filter for a still image having no motion, separating a luminance signal and a color signal from said composite video signal by using a band pass filter or a two-dimensional comb filter for a moving picture having motion and reproducing a video signal, comprising:

• a first motion detection unit for finding a difference between a luminance signal included in a predetermined composite video signal in a current frame and a luminance signal included in a composite video signal in a past frame having a predetermined time interval and outputting a first motion detection signal in accordance with the difference;
• a second motion detection unit for extracting luminance signals included in three composite video signals in said current frame based on three composite video signals having a predetermined interval in a vertical direction in said current frame and three predetermined composite video signals in the vertical direction at the same position in said past frame, detecting the correlation of color signal components remaining in the extracted video signals, and outputting a second motion detection signal in accordance with the result of the detection;
• a color signal difference calculating means for calculating a difference of absolute values of color signals in the current frame calculated based on said three composite video signals in said current frame and color signals in the past frame calculated based on the composite video signals of said past frame;
• a selecting means for selecting the difference of said color signals calculated by said color signal difference calculating means when either of said first motion detection signal or said second motion detection signal indicates that there is motion and selecting an intended value indicating that there is no motion when both of said first motion detection signal and said second motion detection signal indicate that there is no motion;
• and
• a motion coefficient generating means for outputting a motion coefficient indicating motion in accordance with the value selected by said selecting means.

A TV receiver for judging motion of an image in accordance with a motion coefficient generated based on a composite video signal, separating a luminance signal and a color signal from said composite video signal by using a frame comb filter for a still image having no motion, separating a luminance signal and a color signal from said composite video signal by using a band pass filter or a two-dimension comb filter for a moving picture having motion and reproducing the video signal, comprising:

• a first motion detection unit for finding a difference between a luminance signal included in a predetermined composite video signal in a current frame and a luminance signal included in a composite video signal in a past frame having a predetermined time interval and outputting a first motion detection signal in accordance with the difference;
• a second motion detection unit for extracting luminance signals included in a plurality of composite video signals in said current frame based on a plurality of composite video signals having a predetermined interval in a vertical direction in said current frame and a plurality of predetermined composite video signals in the vertical direction at the same position in said past frame, detecting the correlation of color signal components remaining in the extracted video signals, and outputting a second motion detection signal in accordance with the result of the detection;
• a color signal difference calculating means for calculating a difference of absolute values of color signals in the current frame calculated based on said three composite video signals in said current frame and color signals in the past frame calculated based on the composite video signals of said past frame;
• a first selecting means for selecting the difference of said color signals calculated by said color signal difference calculating means when said first motion detection signal indicates that there is motion and selecting an intended first value indicating that there is no motion when said first motion detection signal indicates that there is no motion;
• a second selecting means for selecting an intended second value indicating that there is motion when said second motion detection signal indicates that there is motion and selecting the output signal of said first selecting means when said second motion detection signal indicates that there is no motion;
• and
• a motion coefficient generating means for outputting a motion coefficient indicating motion in accordance with the value selected by said second selecting means.