Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
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.
Matsushita Electric - Industrial Co., Ltd.
Tung Kee M.
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