Patent ID: 7548663

Claim:
An intra-field interpolation device for converting an interlaced video signal to a de-interlaced video signal, the device comprising: a gradient unit receiving an image field for determining a gradient of a first line above a target pixel in the image field and a second line below the target pixel in the image field; a first pixel difference unit receiving the image field of the interlaced video signal for determining a pair of pixel difference sets on either side of a normal axis of the target pixel in an alternate field of the interlaced video to thereby generate two candidate blending angles for the target pixel, wherein the first pixel difference unit is for generating the two candidate blending angles for the target pixel further according to the gradient; a second pixel difference unit receiving the image field for determining two reference pixel differences in the image field being along a reference angle on either side of the normal axis of the target pixel; an angle selection unit being coupled to the first pixel difference unit and the second pixel difference unit for determining an optimal blending angle according to the two candidate blending angles determined by the first pixel difference unit, and the two reference pixel differences determined by the second pixel difference unit; and a weighted blending unit being coupled to the angle selection unit and receiving the image field for blending a plurality of pixel values in the image field along the optimal blending angle to thereby generate the target pixel in the de-interlaced video signal.