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Intra-macroblock DC and AC coefficient prediction for interlaced digital video
| Details |
Inventors: Eifrig, Robert O.; Chen, Xuemin; Luthra, Ajay;
Assignee: General Instrument Corporation (Horsham, PA)
Primary Examiner: Tadayon; Bijan
Assistant Examiner:
Attorney, Agent or Firm: Lipsitz; Barry R., Hoppin; Ralph F.
DC and AC DCT transform coefficients of an INTRA coded block are differentially encoded by selecting predictor DC and AC coefficients from a left-hand neighboring block and a top neighboring block. Each block is coded according to a frame mode, a reordered field mode, and a non-reordered field mode. The AC predictor block is selected according to the respective coding modes of the blocks, and the block in which a DC predictor resides. The top block is selected as an AC predictor when the top block and current block are both reordered field mode, or both frame mode and/or non-reordered field mode, and the DC predictor resides in the top block. Zeroed AC spatial transform coefficients are used in place of the AC spatial transform coefficients from the selected block when the selected block is not INTRA coded, or does not reside in the same Video Object Plane (VOP) as the current block. DC coefficients may be non-linearly quantized. |
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DETAILED DESCRIPTION In accordance with the present invention, a method and apparatus are presented for selecting predictor coefficients for differentially coding the coefficients of a current INTRA coded block.
A method for coding spatial transform coefficients of a current, INTRA coded block in a digital video image includes the step of identifying an adjacent left-hand block, an adjacent top block, and a top, left block which is adjacent to the left-hand block and the top block.
The left-hand block, top block, and top, left block each have a DC spatial transform coefficient and a plurality of AC spatial transform coefficients.
Additionally, each of the blocks is coded in a coding mode according to a frame mode, a reordered field mode, or a non-reordered field mode.
Predictor AC spatial transform coefficients are selected from the left-hand block or the top block for use in differentially encoding the AC spatial transform coefficients of the current block.
The selecting step considers the coding mode of the current block and the top block.
In particular, the AC spatial transform coefficients may be selected from the left-hand block when the top block is coded according to the frame mode or the non-reordered field mode, and the current block is coded according to the reordered field mode.
The AC spatial transform coefficients may be selected from the left-hand block when the current block is coded according to the frame mode or the non-reordered field mode, and the top block is coded according to the reordered field mode.
The DC spatial transform coefficient for use in differentially encoding the DC spatial transform coefficient of the current block may be selected from the left-hand block or the top block according to a gradient between the DC spatial transform coefficients of the left block and the top, left block, and a gradient between the DC spatial transform coefficients of the top block and the top, left block.
The AC spatial transform coefficients may be selected from the left-hand block or the top block according to the selected DC spatial transform coefficient
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Image Analysis 
