Orthogonal transformation encoder

Details Orthogonal transformation encoder Orthogonal transformation encoder

1992-02-14

1993-12-07

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358105, 358133, H04N 7133

Patent

active

052687554

ABSTRACT:
Disclosed is an orthogonal transformation encoder in which after horizontal orthogonal transformation is performed, in parallel to the horizontal and vertical rearrangement of the coefficients for performing vertical orthogonal transformation, detection of interfield coefficient is performed and intra-frame/intrafield modes for the vertical orthogonal transformation are switched. Further, in parallel to the rearrangement of the transformation coefficients for the vertical orthogonal transformation to be in the ascending order from a lower frequency component to a higher frequency component, the amplitude values of the AC components in the block in question are detected to thereby make control on the basis of the amplitude values so that the smaller the amplitude value of the block the smaller the quantizing step width.

REFERENCES:
patent: 5091782 (1992-02-01), Krause

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