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Screen Expansion Method - Via to XGA Mapping Method

IP.com Disclosure Number: IPCOM000109876D
Original Publication Date: 1992-Sep-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Aruga, N: AUTHOR [+2]

Abstract

This method takes ergonomics into consideration. It is assumed that the human eye perceives the displayed characters or images by means of luminance energy not maximum luminance level. Therefore, if the total energy is equivalent, the screen image is perceived natural even though the luminance level is not continuous. This is also a starting point. This assumption will be proved correct by the figures.

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Screen Expansion Method - Via to XGA Mapping Method

       This method takes ergonomics into consideration.  It is
assumed that the human eye perceives the displayed characters or
images by means of luminance energy not maximum luminance level.
Therefore, if the total energy is equivalent, the screen image is
perceived natural even though the luminance level is not continuous.
This is also a starting point.  This assumption will be proved
correct by the figures.

      Consider herein at first is the most simple case with one
dimension.

      In Fig. 1, the following relations exist.
            E' = (W'+ W) x L
            E" = W x (L + L")
where      E  : Luminance energy in step 0.
            E' : Luminance energy in step 1.
            E" : Luminance energy in step 2.
            W  : pel width
            W' : expanded pel width

      The luminance level L" will be determined so that the energy E'
gets equivalent to E".  Therefore, as E'=E",
            W'x L = W x L"
Then,
            L" = W'/ W x L

      Herein, gamma characteristics should be considered.  And the
luminance level and the pel width are discrete.  If the coefficient
of gamma characteristic is g,
            L" = K x L x g
 where     g : gamma coefficient
           K : constant in proportion to W'/W
L" will take one of the corresponding gray scale levels...