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US 7,548,663 B2Granted
Intra-field interpolation method and apparatus
AssigneeRealtek Semiconductor Corp.
InventorPo-Wei Chao
Life of this patent
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Abstract
An intra-field interpolation method and apparatus for generating a target pixel value. The method includes the following steps of: receiving a plurality of pixel values of an image field; generating a first pixel difference set from the received pixel values using a first pixel difference algorithm; generating a second pixel difference set from the received pixel values using a second pixel difference algorithm; and blending the received pixel values according to the first pixel difference set and the second pixel difference set, to generate the target pixel value.
Claims14
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.
3 more elements
An intra-field interpolation device for converting an interlaced video signal to a de-interlaced video signal, the device comprising:
- a first pixel difference unit receiving an image field of the interlaced video signal for determining a pair of pixel difference sets on either side of a normal axis of a target pixel in an alternate field of the interlaced video to thereby generate two candidate blending angles for the target pixel;
- 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;
- wherein the angle selection unit includes an angle voting unit for determining the optimal blending angle further according to two previously utilized blending angles;
- wherein the two previously utilized blending angles correspond to blending angles for two previous pixels that were interpolated prior to the target pixel.
4 more elements
An intra-field interpolation method of converting an interlaced video signal to a de-interlaced video signal, the method comprising:
- receiving an image field of the interlaced video signal;
- utilizing a gradient unit 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;
- utilizing a first pixel difference unit 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 two candidate blending angles for the target pixel are generated further according to the gradient;
- utilizing a second pixel difference unit 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;
- utilizing an angle selection unit for determining an optimal blending angle according to the two candidate blending angles and the two reference pixel differences;
- and
- utilizing a blending unit 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.
4 more elements
An intra-field interpolation method of converting an interlaced video signal to a de-interlaced video signal, the method comprising:
- receiving an image field of the interlaced video signal;
- utilizing a first pixel difference unit for determining a pair of pixel difference sets on either side of a normal axis of a target pixel in an alternate field of the interlaced video to thereby generate two candidate blending angles for the target pixel;
- utilizing a second pixel difference unit 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;
- utilizing an angle selection unit for determining an optimal blending angle according to the two candidate blending angles and the two reference pixel differences, and
- further according to two previously utilized blending angles;
- wherein the two previously utilized blending angles correspond to blending angles for two previous pixels that were interpolated prior to the target pixel;
- and
- utilizing a blending unit 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.
5 more elements
Dependencies are inferred from the claim text.