Method for adaptively selecting filters to interpolate video data

A method for adaptively selecting filters to interpolate video data, comprising:

• receiving the video data encoded by a 4:2:2 sampling format;
• adaptively selecting filters to convert the color components in the video data to a 4:4:4 sampling format based on differences of luminance and color components among a pixel P, a pixel P_1 on the left of the pixel P, a pixel P_2 on the left of the pixel P_1, a pixel P_3 on the left of the pixel P_2, a pixel P1 on the right of the pixel P, a pixel P2 on the right of the pixel P1, and a pixel P3 on the right of the pixel P2 in the video data, comprising:
• determining whether a difference between the color components of the pixels P1 and P_1 is larger than a first threshold;
• if larger than the first threshold, determining whether a difference between the luminances of the pixels P and P1 is smaller than a second threshold;
• if smaller than the second threshold, using a full left enhancing filter or a full right enhancing filter to convert the video data;
• if not smaller than the second threshold, using a center-to-left enhancing filter or a center-to-right enhancing filter to convert the video data;
• if not larger than the first threshold, determining whether a difference between the luminances of the pixels P and P_1 or the pixels P and P1 is larger than a third threshold;
• if larger than the third threshold, determining whether a difference between a variation of the luminances among pixels P_2 to P and a variation of the luminances among pixels P to P2 is larger than a forth threshold;
• if larger than the forth threshold, using the center-to-left enhancing filter or the center-to-right enhancing filter to convert the video data;
• if not larger than the forth threshold, using a center-to-left loosing filter or a center-to-right loosing filter to convert the video data;
• and
• if not larger than the third threshold, using a central averaging filter to convert the video.