Abstract: Video systems generally include chroma processors. The chroma processor may be configured as a chroma keyer, a key signal generator or a color collector. The chroma processor includes dual input look-up tables which are loaded by a central processor. The dual input look-up tables may be read and written to simultaneously. The look-up tables are addressed by chrominance signals, luminance signals or key signals input into the chroma processor. The look-up tables provide an exceptionally fast apparatus and exceptionally flexible method of keying one or more simultaneous regions of the display based on one or more unique chroma/luma combinations, new key signals, chrominance signals, and luminance signals. The chroma processor receives color modification parameters from a software user interface. Preferably, the chroma processor utilizes Y luminance signals, and U and V chrominance signals.

Abstract: A system for providing remote locations with processed data relating to weather conditions or the like. A transmitter adapted to receive complex, real-time radar data, including azimuth, range and elevation from the National Weather Bureau (NWB) radar network is used to process the data into a four-range radar image and to append geographic overlay information for transmission over voice grade phone lines to remote receivers. In the receivers, the data from the phone lines is converted by a demodulator into digital data and stored into predetermined memory locations corresponding to the four-range categories from which the radar data had originally been acquired. Once stored, any one of the ranges can be individually and instantaneously selected for display in a six-color format representing six predetermined precipitation intensity levels established by the NWB.