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METHOD, CODER AND DECODER FOR TRANSMITTING AND COMPATIBLY RECEIVING STANDARDIZED TELEVISION SIGNALS.
METHOD, CODER AND DECODER FOR TRANSMITTING AND COMPATIBLY RECEIVING STANDARDIZED TELEVISION SIGNALS.
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机译:传输和兼容接收标准电视信号的方法,编码器和解码器。
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摘要
In a system for generating a compatible television signal with a "letterbox" display format, groups of vertically arranged picture elements (pels) are subjected to vertical DCT transformation producing eight DCT coefficients. Intermediate sixth and seventh coefficients are placed in the letterbox bar regions. The remaining six coefficients, namely the first through fifth coefficients and the highest frequency eighth coefficient, are inverse DCT transformed and processed with the main image information. A standard aspect ratio receiver displays a letterbox image using only the remaining six coefficients. A wide aspect ratio receiver uses the six remaining coefficients with the two coefficients from the bar regions, after inverse DCT, to produce a full resolution wide aspect ratio image.
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