Signal converter and signal conversion method

Television – Format conversion – Changing number of lines for standard conversion

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Details

348409, 348415, 348437, 348438, H04N 521

Patent

active

059661836

ABSTRACT:
The present invention relates to a signal converter and a signal conversion method in which an interpolated image is formed on the basis of suitable classification according to features of an input image signal to obtain a high-definition image signal. In a frequency characteristic determination section, frequency characteristics of an input image signal are classified and evaluated with respect to each of predetermined unit blocks. On the basis of the result of this classification, the desired one of a plurality of pixel patterns is selected with respect to each of the unit blocks of the input image signal, thereby setting a spatial class. In a classification section, the input image signal forming the selected pixel pattern undergoes data compression processing by the number of quantization bits according to the frequency characteristics, thereby forming a spatial class after compression. Interpolated pixels are formed from the input image signal by using prediction coefficients or predicted values based on the spatial class after compression.

REFERENCES:
patent: 4648119 (1987-03-01), Wingfield et al.
patent: 4684985 (1987-08-01), Nakagaki et al.
patent: 5010402 (1991-04-01), Nishibo et al.
patent: 5416857 (1995-05-01), Chen et al.
patent: 5638128 (1997-06-01), Hoogenboom et al.

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