Y/C separation with 3D comb filter

A Y/C separation with a three-dimension (hereafter abbreviated as 3D) comb filter comprising:

• acquiring a two-dimension (hereafter abbreviated as 2D) chrominance signal, which is formed by separating a plurality of chrominance signals of every scan-line in a same image frame, band-pass filtering every scan line and every two adjacent scan-lines, color demodulating, difference comparing to get a minimum value and to mix by a ratio;
• acquiring a 3D chrominance signal and calculating a chrominance variation value, which are formed by separating a plurality of chrominance signals of the scan-lines at the same positions of two adjacent image frames, band-pass filtering, color demodulating, and difference comparing to get a minimum value and the chrominance variation value of the same positions of the two adjacent image frames;
• resolving an actual chrominance signal of the current scan-line by taking the chrominance variation value as a mixture ratio value to perform ratio mixing on the 2D chrominance signal and the 3D chrominance signal to output a near-actual chrominance signal;
• and
• separating an actual luminance signal of the current scan-line by deducting the near-actual chrominance signal from a plurality of signals of the current scan-line to restore the luminance signal.