Method and apparatus for overlaying displayable information

Details Method and apparatus for overlaying displayable information Method and apparatus for overlaying displayable information

1991-12-03

1993-11-02

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, 345114, H04N 5272

Patent

active

052588432

ABSTRACT:
A video system is disclosed which is capable of receiving digital data from a source such as a video camera, and subsequently transferring the received data into a main frame buffer for display on a video display, where the data from the source can overlay a primary image stored in the main frame buffer. An auxiliary frame buffer, consisting of a bank of dual-port RAMs, receives the data of the overlay image via its serial port and transfers this data into the randomly accessible array therein. A direct-memory-access (DMA) operation performs the transfer from the auxiliary frame buffer into the main frame buffer, with the source and destination positions in the auxiliary and main frame buffers, respectively, independently selectable. The performance of the DMA operation can be enhanced by simultaneously performing a page mode read of the auxiliary frame buffer with a page mode write to the main frame buffer.

REFERENCES:
patent: 4218710 (1980-08-01), Kashigi
patent: 4360831 (1982-11-01), Kellar
patent: 4568981 (1986-02-01), Beaulier
patent: 4680630 (1987-07-01), Field
patent: 4907086 (1990-03-01), Truong
patent: 5099331 (1992-03-01), Truong

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