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Method and apparatus for encoding video signals in 3-D blocks without detecting image motion
| Details |
Inventors: Hatano, Yoshiko; Onishi, Ken; Asamura, Yoshinori; Itou, Takashi; Tsukamoto, Manabu;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Boudreau; Leo H.
Assistant Examiner: Johns; Andrew W.
Attorney, Agent or Firm:
A coding method and apparatus is for coding a digital video signal of interlaced type. Three-dimensional (horizontal, vertical and temporal directions) blocks are constructed for each of a plurality of picture elements, orthogonal transform is performed to each of the three-dimensional blocks and coefficients are coded. Coefficients non-effected by a pseudo-moving part are weighted with a low rate, and coefficients effected by a pseudo-moving part are weighted with high rate. After the vertical positions of picture elements of odd-number fields and those of even-number fields are coincided with each other by an intra-field picture element operation, the digital video signal is formatted and three-dimensional orthogonal transform is performed. |
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DETAILED DESCRIPTION One object of the present invention is to provide a coding method and a coding apparatus capable of effectively reducing redundancy of a video signal in interlaced scanning form.
Another object of the invention is to provide a coding method and a coding apparatus capable of reducing information content at the time of the moving picture without judging whether the picture is moving or still.
Still another object of the invention is to provide a coding method and a coding apparatus capable of reducing information content at the time of the moving picture without deterioration of image quality of a still picture at a decoding side.
A further object of the invention is to provide a coding method and a coding apparatus capable of more effectively reducing redundancy of video signals in interlaced scanning form by making spatial positions of picture elements in odd-number fields and those in even-number fields coincide with each other.
In one coding method of the invention, as to video signals in interlaced scanning form, a two-dimensional block is composed in each field, and the odd-number and the even-number fields are bundled in temporal direction to compose a three-dimensional block in every spatially adjacent picture element, and coding is performed by orthogonal transform on every 3-D block.
When compared with a conventional example, it has a more accurate signal composition in the temporal direction, being capable of reducing video signal.
In another coding method of the invention, quantizing is performed after weighting, on a coefficient by which a pseudo-moving part due to the effect of interlaced scanning does not appear, and quantizing is performed intact on a coefficient by which the pseudo-moving part appears.
At this time, in the case of still picture, as weighting is performed on a coefficient whose value is originally zero, data is not lost at all.
Further, there is no deterioration in image quality of still picture at the decoding side.
On the other hand, in the case of a moving picture, as the coefficient is converted into zero or a small number by weighting, the information content is reduced
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