Patent ID: 6771879
Filing Date: 2004-08-03
Classification: H04N

Abstract:
A video processor for processing video and key signals to be processed by a television production switcher for superimposing text on a background image, the video processor comprising:a key generator for receiving an input video signal and an input key signal and selecting one of the input video and key signals and shaping waveforms of the selected signal and producing an output signal; a first frame memory for receiving said input video signal and storing the received signal and reading the stored video signal according to a first control signal applied thereto; a second frame memory for receiving the output signal of said key generator and storing the received signal and reading the stored signal according to a second control signal applied thereto; a delay circuit for introducing a delay time corresponding to processing time of said key generator to said input video signal; a first switch for selecting one of an output signal of said delay circuit and an output signal of said first frame memory; and a second switch for selecting one of the output signal of said key generator and an output signal of said second frame memory.