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post #1 of 4 Old 10-01-2002, 06:18 PM - Thread Starter
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Can I get an explanation of what the NEC tridigital technology does to improve blacks?


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post #2 of 4 Old 10-01-2002, 06:53 PM
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Hi Art:

Here are a few links and excerpts I copied regarding the technology. I think the press blurbs gloss over an incredibly complicated process. This process was originally developed for CRT and later completely redeveloped for DLP. I have spoken with engineers at NEC and only one was able to talk fluently about the subject.

Standard digital video is sometimes called 4:2:2 video, which means that the red and blue image components of the Y,Pb,Pr video signal are sampled are half the rate of the green (Y) signal. This means that while the overall image can look fine, the blue or red portions loose information and can look "washed out." However, a part of the NEC HD4K's tri-digital processing fixes that problem by turning 4:2:2 video signals into 4:4:4 RGB signals. NEC does that by using grayscale and sampling information contained in the green channel's information to re-interpret the red and blue channels' data. The results are realistic and impressive: grayscales and details appear where they were washed out before.


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NEC has engineered a replacement technology for the ordinary video decoder called TriDigital Image Processing. TriDigital Image Processing entails three key steps to optimally decode film transfer material for digital projection. First, the ColorBitâ„¢ Pre-Processor decodes incoming signals to satisfy the unique requirements for film based materials. The Deep BlackBitâ„¢ Decoder then extracts the maximum dynamic range of the original filmed image to produce deep, dark blacks that still exhibit the contrast and detail of the original film material. This is achieved without increasing the background noise level or producing detail contours inherent in conventional electronic projector systems that attempt to deliver dark area detail. Lastly, the Wide ColorBitâ„¢ Post-Processor manufactures an image that overcomes the RGB characteristics of the projector - characteristics that would otherwise make the image appear as video. This element of the process is crucial because film is not an RGB medium, but instead, dye particulates suspended in an emulsion that interact with the light from a traditional mechanical projector. This is the essence of the look and feel of film. The TriDigital Image Processing system strives to duplicate the "age-old" mechanical and optical/light interaction of film within the "new-age" digital domain.

In addition to the display of the highest fidelity of film based material, images from virtually any source can be displayed on the TriDigital HD4K. This would include private or open DSS satellite, DVD, VHS, video servers, DigiBeta decks and many other sources. The TriDigital HD4K can also display a multitude of video standards both analog and digital such as NTSC, PAL and SECAM, SDTV, HDTV in 4:3 and 16:9 aspects and an incredible assortment of computer generated images.
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post #3 of 4 Old 10-01-2002, 07:00 PM
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Also drop Doug an email. He's had a lot of experience with these and can go into detail.
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post #4 of 4 Old 10-01-2002, 10:33 PM
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It sounds like it's a way to restore full color bit depth and give a pleasing gamma curve. I don't see that it has a thing to do with black levels, which are set by the amount of light leakage.

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