Television – Image signal processing circuitry specific to television – Noise or undesired signal reduction
Patent
1998-01-15
2000-10-10
Powell, Mark R.
Television
Image signal processing circuitry specific to television
Noise or undesired signal reduction
348609, 348910, 348447, 348448, 345147, 345 58, 382254, 382272, 358160, 358167, H04N 701
Patent
active
061307238
ABSTRACT:
The present invention provides a method and system for reducing flicker within an interlaced image. The method and system comprises identifying an area of the interlaced image where flicker needs to be reduced and adaptively adjusting a pattern of pixels derived from a non-interlaced spatial relationship of the interlaced image within the area based upon characteristics of the image. A flicker filter is provided which utilizes an adaptive technique whereby pixel-blending characteristics are constantly changed within the image depending on particular image attributes. It is unique in that high vertical resolution is maintained for detailed image content such as text and most graphics, while flicker is effectively reduced on image content that is flicker prone. The filter is based on psycho-visual studies and simulations performed by the company as well as numerous prior flicker filter implementations. This has achieved the goal to maximize vertical resolution, enhancing text and graphics sharpness while still suppressing noticeable flicker. In the present invention, the flicker filter attributes are fully programmable allowing optimization for particular system configurations (screen size, display type, graphics resolutions, etc). The present invention is particularly useful for textual content which is generally not flicker prone yet requires high vertical resolution for comfortable reading.
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Innovision Corporation
Powell Mark R.
Sajous Wesner
LandOfFree
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