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    • 30. 发明授权
    • Image generator for simulating the illumination effects of a
vehicle-mounted light source on an image displayed on a screen
    • 用于模拟车载光源对屏幕上显示的图像的照明效果的图像发生器
    • US5384719A
    • 1995-01-24
    • US960402
    • 1993-01-15
    • Stephen J. BakerKarl J. WoodGraham J. OliveJeffrey N. Smith
    • Stephen J. BakerKarl J. WoodGraham J. OliveJeffrey N. Smith
    • G09B9/32G06T15/50G09B9/30G06F15/60
    • G06T15/506G09B9/301
    • A method and apparatus for simulating the illumination effects of a vehicle-mounted light source in an image displayed on a screen. The image is intended to represent the appearance of a model defined in a database in world space coordinates from and eyepoint position in world space, the model being defined in terms of a plurality of features each having predetermined attributes. The vehicle-mounted light source is defined in terms of an origin and a direction in eyepoint space. For each feature potentially contributing to the image, the angular position of a point on that feature relative to the light source is calculated as the angle between the light source direction and a line drawn to that point from the light source. An illumination intensity for that point is determined by reference to the calculated angle, and the illumination intensity is reduced as a function of the distance from the eyepoint to the said point to provide a resultant intensity. The attributes of the feature at the said point are modulated as a function of the resultant intensity.
    • PCT No.PCT / GB91 / 00884 Sec。 371日期:1993年1月15日 102(e)日期1993年1月15日PCT Filed Jun。3,1991 PCT Pub。 公开号WO91 / 19280 日期1991年12月12日。一种用于模拟车载光源在屏幕上显示的图像中的照明效果的方法和装置。 该图像旨在表示在世界空间中的世界空间坐标和眼点位置的数据库中定义的模型的外观,该模型根据具有预定属性的多个特征来定义。 车载光源根据眼点空间中的原点和方向来定义。 对于潜在地对图像有贡献的每个特征,该特征相对于光源的点的角位置被计算为光源方向与从光源绘制到该点的线之间的角度。 通过参照计算出的角度确定该点的照明强度,并且照射强度作为从眼点到所述点的距离的函数减小以提供合成的强度。 所述点处的特征的属性作为合成强度的函数被调制。