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Displaying non-linear images on linear displays

A non-linear, display technology, used in cathode ray tube indicators, static indicators, instruments, etc., can solve problems such as not providing optimal performance, and achieve the effect of image quality optimization and flexible design

Active Publication Date: 2008-09-10
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, traditional dithering techniques do not provide optimal performance in SLM-based displays

Method used

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  • Displaying non-linear images on linear displays
  • Displaying non-linear images on linear displays
  • Displaying non-linear images on linear displays

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Embodiment Construction

[0021] [0021] The present invention is described with reference to exemplary embodiments in a specific context, namely a video display system using a digital micromirror device (DMD) spatial light modulator. The invention can also be applied in other contexts such as other video display systems with linear response such as other SLM based systems including LCD, LCoS, deformable mirror based display systems and non-SLM based systems with limited bit precision .

[0022] [0022] FIGS. 1a and 1b illustrate the display of gamma corrected image and video signals on nonlinear and linear displays. Figure Ia shows the display of a gamma-corrected image 105 on a non-linear display 110, such as a CRT. As long as the gamma correction properly matches the characteristics of the CRT 110, the gamma corrected image 105 will display on the CRT 110 as intended. If the gamma correction does not properly match the characteristics of the CRT 110, the gamma corrected image 105 may not be displaye...

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Abstract

System and method for gray scale mapping for displaying non-linear images on linear displays (see figure 5). A preferred embodiment comprises applying a linearizing function to a non-linear image to produce a linear image (505), selecting a picture element in the line image (515), determining a First gray shade (520) and a second gray shade (525) based upon the picture element, computing a dither percentage (530), and selecting either the first gray shade (540) or the second gray shade (545) based upon the dither percentage and a threshold value. The dithering can reduce the presence of contouring, which reduces image quality, while non- linear spacing between gray shades permits the optimization of pulse width modulation sequences to reduce transition artifacts.

Description

technical field [0001] [0001] The present invention relates generally to systems and methods for image display systems, and more particularly, to systems and methods for displaying non-linear images on linear displays. Background technique [0002] [0002] Cathode ray tube (CRT) based displays have a non-linear response. Therefore, in order to display the image properly, a non-linear transfer function is applied to the image prior to display on the CRT based display. This nonlinear transfer function is often referred to as a gamma correction curve. Since CRT-based displays dominate the market, non-linear transfer functions are automatically applied to many image and video streams (such as broadcast television and video on videocassette and DVD). [0003] [0003] In order to properly display transformed images and video streams on linear displays, an inverse transfer function (often referred to as a de-gamma curve) must be applied to the transformed images and video streams, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G5/02
CPCG09G3/2051G09G3/346G09G2320/0276
Inventor J·M·肯普夫
Owner TEXAS INSTR INC