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Mapping samples of foreground/background color image data to pixel sub-components
| Details |
Inventors: Hill, William; Duggan, Michael; Keely, Jr., Leroy B.; Hitchcock, Gregory C.; Whitted, J. Turner;
Assignee: Microsoft Corporation (Redmond, WA)
Primary Examiner: Hjerpe; Richard
Assistant Examiner: Tran; Henry N.
Attorney, Agent or Firm: Workman, Nydegger & Seeley
Methods and apparatus are described for sampling image data that includes foreground/background color information and mapping the samples to pixel sub-components which form a pixel element of an LCD display so that each pixel sub-component has a different portion of the image mapped thereto. The methods can be used with conventional color LCD displays that include pixels consisting of three non-overlapping red, green and blue rectangular pixel sub-elements or sub-components. The separately-controllable nature of individual RGB pixel sub-components is used to effectively increase a screen's resolution in the dimension perpendicular to the dimension in which the screen is striped. A scan conversion process maps samples of the image data to individual pixel sub-components, resulting in each of the pixel sub-components representing a different portion of the image. The color values are independently generated for each of the red, green, and blue pixel sub-components based on different portions of the image, rather than the color values for the entire pixel being generated based on a single sample or the same portion of the image. |
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DETAILED DESCRIPTION The present invention is directed to methods and apparatus for displaying image data that includes foreground/background color information by representing different portions of the image on each of multiple pixel sub-components, rather than on entire pixels.
The inventors of the present application recognize the well-known principle that human eyes are much more sensitive to edges of luminance, where light intensity changes, than to edges of chrominance, where color intensity changes.
This is why it is very difficult to read red text on a green background, for example.
They also recognize the well-known principle that the eye is not equally sensitive to the colors of red, green and blue.
In fact, of 100 percent luminous intensity in a fully white pixel the red pixel sub-component contributes approximately 30% to the overall perceived luminance, green 60% and blue 10%.
Various features of the present invention are directed to utilizing the individual pixel sub-components of a display as independent luminous intensity sources thereby increasing the effective resolution of a display by as much as a factor of 3 in the dimension perpendicular to the direction of the RGB striping.
This allows for a significant improvement in visible resolution.
While the methods of the present invention may result in some degradation in chrominance quality as compared to known display techniques, as discussed above the human eye is more sensitive to edges of luminance than of chrominance.
Accordingly, the present invention can provide significant improvements in the quality of images, compared to known rendering techniques, even when taking into consideration the negative impact the techniques of the present invention may have on color quality.
As discussed above, known monitors tend to use vertical striping.
Because character stems occur in the vertical direction the ability to accurately control the thickness of vertical lines when rendering horizontally flowing text tends to be more important than the ability to control the thickness of horizontal lines
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Image Analysis 
