Television – Format conversion – Conversion between standards with different aspect ratios
Patent
1995-05-04
1997-04-15
Burgess, Glenton B.
Television
Format conversion
Conversion between standards with different aspect ratios
348451, 348452, 348458, 348563, H04N 5278
Patent
active
056214693
ABSTRACT:
A scan converting apparatus receives an NTSC signal which is scan converted and which has a changed aspect ratio. The subtitle domain, which is vertically overscaned out of the screen and cannot be observed, is extracted and superimposed on the scan converted image. Scanning lines of a brightness output signal of a brightness/chrominance signal separator are interpolated at a scanning line interpolator and are converted to a system which has more scanning lines at a scanning line converter. An odd/even field discriminator prevents deterioration of the resolution of the subtitle letters which is caused by an interchange of the positions between two adjacent scanning lines when the subtitle is transferred to a different field. By stopping the writing of data to a field memory in the subtitle signal processor when a subtitle is transferred, a subtitle transfer can be accomplished even when there is no subtitle on the image.
REFERENCES:
patent: 4636857 (1987-01-01), Achiha et al.
patent: 4954882 (1990-09-01), Kamemoto
patent: 5029001 (1991-07-01), Tanaka et al.
Matsuura Ryuji
Monta Hiroki
Burgess Glenton B.
Matsushita Electric - Industrial Co., Ltd.
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