(iii) said key signal processing system includes a microprocessor-controllable clipping circuit that selects from a plurality of different clipping characteristics (ii) said key signal processing system is configured to provide user-selectable randomized rounding of fractional values of the digital video signals to integers over different ranges of fractional values, with fractional values outside said different ranges being rounded to a closest digit (i) said key signal processing system includes a look-up table containing a plurality of user-selectable look-up table input/output characteristics, said key signal processing system being configured to allow selection of different look-up table input/output characteristics for a television frame to provide different outputs for different portions of the television frame Wherein said key signal processing system has at least one characteristic selected from the group consisting of: A digital image compositing system comprising:Ī plurality of digital video signal inputs Ī first plurality of crosspoint switches, coupling said plurality of digital video signal inputs to said key signal processing system and to said video image compositor Ī key input coupled through said plurality of crosspoint switches to said key signal processing system Ī plurality of digital video signal outputs andĪ second plurality of crosspoint switches, coupling said key signal processing system and said video image compositor to said plurality of digital video signal outputs The microprocessor (62) is also connected to a video editor at (68).ġ. A control keyboard and display (64) is connected to the microprocessor at (66). A microprocessor (62) is connected to provide control signals for all of the functional elements of the system (20). An analog output (58) is also connected to the busses (48), (22), (24), (52) and (28) by additional crosspoint switches (56) through D/A converter (60). A D1 auxiliary output (54) is connected to program bus (48), background bus (22), foreground bus (24), processed key bus (52) and mask bus (28) by crosspoint switches (56). A D1 key output (50) is connected to the output of key processing toolkit subsystem (42) on processed key bus (52). A D1 program output (46) is connected to the output of the compositor subsystem (44) on program bus ( 48). A compositor subsystem (44) is connected to the background and foreground busses (22) and (24) and to the output of the key processing toolkit subsystem (42). A key processing toolkit subsystem (42) is connected to the output of the frame stores (38) and (40). The key and mask busses (26) and (28) are respectively connected to frame stores (38) and (40). Four digital D1 video signal inputs (36) are connected to the busses (22-24) through additional crosspoint switches (34). An analog key input (30) is connected to the key and mask busses (26) and (28) through an analog/digital (A/D) converter (32) by crosspoint switches (34). A digital image compositing system (20) has background, foreground, key and mask busses (22), (24), (26), and (28).
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