TV graphic displays without quantizing errors from compact image

Details TV graphic displays without quantizing errors from compact image TV graphic displays without quantizing errors from compact image

1985-01-25

1987-04-07

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340747, 342185, G09G 100

Patent

active

046564675

ABSTRACT:
High-amplitude-resolution graphics for raster-scanned television systems are generated beginning with relatively low-amplitude-resolution sampled data from image memory affording spatial resolution approximately the same as that of the television signal, generally at least as large as that afforded by the number of lines per field and by the video bandwidth used in the television system. The sample-data raster scan used in the television system is converted to the coordinate system used for memory addressing. The whole-number portions of the memory address are used to access addressable sample data at points surrounding the point specified by the complete address including whole-number and fractional portions; and the fractional portions of the address are used to perform an interpolation between or among the accessed sample data. The interpolation result has high amplitude resolution despite the low amplitude resolution of sample data stored in memory, which high amplitude resolution arises from conversion of the spatial resolution in excess of that afforded by addressable locations in memory. Image memory can take the form of read-only memory mapping points in an area or in a line with its whole-number addressing, or may simply comprise one or more comparators, for example. The generation of complex, high-resolution displays can thus be supported by a small amount of digital memory.

REFERENCES:
patent: 4002827 (1977-01-01), Nevin et al.
patent: 4127850 (1978-11-01), Vallins
patent: 4360831 (1982-11-01), Kellar

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