Image signal converting apparatus

Details Image signal converting apparatus Image signal converting apparatus

1997-03-27

1999-08-17

Lee, Michael

Television

Format conversion

348458, 348421, 348399, H04N 701, H04N 1120

Patent

active

059401320

ABSTRACT:
An input digital image signal (SD signal) is converted into a high resolution digital video signal (HD signal). A considered pixel is categorized as a class corresponding to a one-dimensional, two-dimensional, or three-dimensional level distribution of a plurality of reference pixels of the SD signal. A predicted value of the considered pixel is generated by linear combination of values of a plurality of pixels of the SD signal adjacent to the considered pixel of the HD signal and predicted coefficients that have been learnt. In the learning process, predicted coefficients are determined by linear combination of the values of pixels of the SD signal and the predicted coefficients so that the sum of squares of the predicted value and the true value is minimized. Instead of the predicted coefficients, representative values may be determined for each class. In this case, the representative values are used as predicted values corresponding to the class of the input SD signal. Examples of the representative values are a base value of a block and a value normalized by dynamic range DR.

REFERENCES:
patent: 5469216 (1995-11-01), Takahashi et al.
patent: 5495297 (1996-02-01), Fujimori et al.
patent: 5666164 (1997-09-01), Kondo et al.

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