Cosine transform computing devices, and image coding devices and

Details Cosine transform computing devices, and image coding devices and Cosine transform computing devices, and image coding devices and

1986-05-05

1988-06-28

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

364725, 364826, G06K 900, G06F 15332

Patent

active

047544910

ABSTRACT:
The invention provides cosine transform computing devices and image decoding devices and coding devices comprising such computing devices. One embodiment of a device for calculating monodimensional cosine transforms by blocks of 16 values comprises: three elementary computing devices for carrying out operations of the addition or subtraction type; two elementary computing devices for carrying out operations of the multiplication and accumulation type; a coupling device; and control means. The number of elementary computing devices is equal to the minimum number required for carrying out the transform calculations at the timing imposed by the arrival of the values to be transformed. Each elementary computing device is reused several times for the calculation of each transform. The coupling device is controlled by the control means for connecting the elementary computing devices in series in an order which varies at each step of the succession of calculations. The coupling device comprises three fixed delay devices for delaying the transmission of certain digital values.

REFERENCES:
patent: 4196448 (1980-04-01), Whitehouse et al.
patent: 4449194 (1984-05-01), Wilhelm

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