Chroma-key signal generator

Details Chroma-key signal generator Chroma-key signal generator

1997-05-16

1998-11-17

Tung, Kee M.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

348587, 348592, G09G 504

Patent

active

058383107

ABSTRACT:
Correspondingly to values stored in a plane memory in which the user can designate candidate pixels for a key color as desired, a data processor reads all items of pixel data indicative of the candidate pixels from a frame memory (memory for storing items of pixel data for one frame of an image) and calculates representative color data. A comparator compares the representative color data with the items of pixel data supplied in synchronism with a pixel clock signal to provide a chroma-key signal. The data processor receives new items of pixel data in a specified cycle, periodically recalculates and updates the representative color data, and supplies the updated representative color data to the comparator. As a result, an effective chroma-key signal is stably generated despite variations in background color.

REFERENCES:
patent: 5122865 (1992-06-01), Choi
patent: 5313275 (1994-05-01), Daly et al.

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