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    • 5. 发明授权
    • Apparatus for fixed-point graphics and method therefor
    • 用于定点图形的装置及其方法
    • US06559856B1
    • 2003-05-06
    • US09392835
    • 1999-09-09
    • Gordon Clyde FossumThomas Winters FoxBimal PoddarHarald Jean Smit
    • Gordon Clyde FossumThomas Winters FoxBimal PoddarHarald Jean Smit
    • G09G502
    • H03M7/24
    • Lighting parameters are received as floating-point numbers from a software application via an application programming interface (API). The floating-point numbers are converted to a fixed-point representation having a preselected number of bits. The number of bits is selected in accordance with a predetermined number of bits required by a frame buffer, which thus establishes the number of color values supported by the graphics display system. In order to preserve accuracy to within the number of bits in each value in the frame buffer, the representation in the fixed-point engine includes additional bits relative to the number of bits in the color values sent to the frame buffer. Floating-point values received via the graphics API are converted to fixed-point representations by first prescaling the floating-point values. The fixed-point operations generate a lighting signal value in accordance with a lighting model, and the number of bits therein is reduced to correspond to the number of bits in each data value required by the frame buffer, and the lighting data values are sent as color values to the frame buffer.
    • 照明参数通过应用程序编程接口(API)从软件应用程序接收为浮点数。 浮点数被转换成具有预选位数的定点表示。 根据帧缓冲器所需的预定位数来选择比特数,从而建立由图形显示系统支持的颜色值的数量。 为了将精度保持在帧缓冲器中的每个值的位数内,定点引擎中的表示包括相对于发送到帧缓冲器的颜色值中的位数的附加位。 通过首先对浮点值进行预分压,通过图形API接收的浮点值被转换为定点表示。 定点操作根据照明模型产生照明信号值,并且其中的比特数减少以对应于帧缓冲器所需的每个数据值中的比特数,并且点亮数据值被发送为 颜色值到帧缓冲区。
    • 10. 发明授权
    • Adaptive span computation during ray casting
    • 光线投射期间的自适应跨度计算
    • US07538767B2
    • 2009-05-26
    • US12037372
    • 2008-02-26
    • Gordon Clyde FossumBarry L Minor
    • Gordon Clyde FossumBarry L Minor
    • G06T15/50
    • G06T15/20
    • Adaptive span computation when ray casting is presented. A processor uses start point fractional values during view screen segment computations that start a view screen segment's computations a particular distance away from a down point. This prevents an excessive sampling density during image generation without wasting processor resources. The processor identifies a start point fractional value for each view screen segment based upon each view screen segment's identifier, and computes a view screen segment start point for each view screen segment using the start point fractional value. View screen segment start points are “tiered” and are a particular distance away from the down point. This stops the view screen segments from converging to a point of severe over sampling while, at the same time, providing a pseudo-uniform sampling density.
    • 射线投射时的自适应跨度计算。 处理器在视图屏幕段计算期间使用起始点分数值,该计算开始视图屏幕段的计算距离下降点的特定距离。 这防止了图像生成过程中的过度采样密度,而不会浪费处理器资源。 处理器基于每个视图屏幕段的标识符来识别每个视图屏幕段的开始点分数值,并且使用起始点分数值来计算每个视图屏幕段的视图屏幕段开始点。 查看屏幕段开始点是“分层”的,距离下降点是特定的距离。 这样就可以阻止观看屏幕段收敛到严重过采样点,同时提供一个伪均匀的采样密度。