Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1993-05-11
1994-06-21
Powell, Mark R.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348571, H04N 521
Patent
active
053232399
ABSTRACT:
A method for reducing the effect of a composite triple beat (CTB) of a visual image is obtained by digitizing the signal for the image frame, dividing the digital signal into a plurality of stripes extending perpendicular to the horizontal lines of the image to form subpictures and determining the average intensity of the signal in each of the horizontal lines of each of the subpictures. An average value for each of the lines in each of the subpictures is then obtained and the component of the signal forming the composite triple beat signal for each line of each subpicture is estimated. Then the estimated triple beat signal is subtracted from its corresponding portion of the digitized signal to provide corrected subpictures. The corrected subpictures are then recombined to form a clean signal providing the cleaned visual image. In a preferred arrangement plurality of consecutive frames are treated as above described to provide average corrections for each line based on the average for the corresponding lines in the subpictures in the plurality of frames and then the subpictures for the frame to be shown next are corrected using the average corrections values to provide an even clearer signal.
REFERENCES:
patent: 3898566 (1975-08-01), Switzer
patent: 4520507 (1985-05-01), Moon
patent: 4677390 (1987-06-01), Wagner
patent: 4995104 (1991-02-01), Gitlin
patent: 5073822 (1991-12-01), Gumm
patent: 5130664 (1992-07-01), Pavlic et al.
patent: 5162900 (1992-11-01), Citta
patent: 5172068 (1992-12-01), Childs
Shi Pingnan
Ward Rabab K.
Grant Chris
Powell Mark R.
Rowley C. A.
The University of British Columbia
LandOfFree
Signal correction for composite triple beat impairments does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal correction for composite triple beat impairments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal correction for composite triple beat impairments will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2224300