Sextant Avionique

Olivier Pernia

Eric Filliatre

Miguel Urquia

Dominique Auger

Louis Montestrucq

A method and system for generating symbols in real time on a display screen. The method and system can be applied to generating symbols for assisting in aircraft piloting and navigation. For the plotted lines generated on a matrix screen such as a liquid crystal display screen, the visual appearance deteriorates since the eye is sensitive to the steps produced by the matrix array. To improve the appearance, the plotted lines are widened and they are modulated in luminosity and in color. This is done by replacing each point of a theoretical plotted line by a micro-zone of N.times.M points modulated in intensity according to a table of instructed-value coefficients. Coefficients are computed for each point of the widened plotted line on the basis of this table and on the basis of coefficients previously computed for the same points. Rather than recording the computed points in the memory at each time and reading them again in subsequent computations, only the definitively processed points are transmitted to the image memory.

Display system with line smoothing using pixel micro-zones and

A method for encoding of words of an image memory designed to be read periodically to refresh an image formed on the screen by set of pixels wherein the image includes surfaces having a uniform color and demarcated by a contour having a median line and the neighborhood of the median line including, on either side of this line, the pixels neighboring a pixel of the median line. The image further contains filar plotting features with one pixel of the screen being in a one to one correspondence with the memory cell containing a word and the reading of the current cell including at least a part of the information needed to write the corresponding pixel on the screen. The method involves recoding memory words in relation to the contours including not only the memory words related to the median lines of the contours but also the memory words related to the neighborhood of the contour. The code of each re-coded memory word includes two information bits concerning the circumstances of the writing of the recoded bits. These two bits enable the identification by the combination of four different possible values.

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Lormont, France

Olivier Pernia