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1. 发明授权

US4757309A Graphics display terminal and method of storing alphanumeric data therein 失效
标题翻译：图形显示终端及其中存储字母数字数据的方法
公开(公告)号：US4757309A
公开(公告)日：1988-07-12
申请号：US748259
申请日：1985-06-24
申请人： Ronald J. Bowater , Michael I. Davis , Robert W. E. Farr , Colin V. Powell
发明人： Ronald J. Bowater , Michael I. Davis , Robert W. E. Farr , Colin V. Powell
IPC分类号： G06G7/163 , G09G5/06 , G09G1/28
CPC分类号： G09G5/06
摘要： The specification describes a method of storing alphanumeric characters in a graphics display terminal comprising a raster-scan display device and a refresh buffer including a plurality of bit planes each having a respective bit storage location corresponding to each addressable pel position on the screen of the display device. In the method, a first bit plane stores high resolution luminance data defining alphanumeric characters each as a selection of "on" bits within a respective n.times.m array where n is the width of the character box in the scan line direction, and at least one further bit plane stores low resolution color data for the characters. The attribute plane comprises a respective n-bit set of storage locations which corresponds to each n-bit wide by one pel deep portion of a character box in the luminance plane and defines at least the color and/or intensity of the foreground and background of the character for the width of the character box in respect of a single scan line. The specification also describes a graphics display terminal in which data in the luminance and attribute planes may be selectively decoded either as alphanumeric data stored as above, or as bit-mapped graphics data.
摘要翻译：本说明书描述了一种在图形显示终端中存储字母数字字符的方法，包括光栅扫描显示装置和包括多个位平面的刷新缓冲器，每个位平面具有对应于显示器屏幕上的每个可寻址像素位置的相应位存储位置设备。在该方法中，第一位平面存储定义字母数字字符的高分辨率亮度数据，每个字符数字字符作为在相应的nxm阵列内的“开”位的选择，其中n是扫描线方向上的字符框的宽度，并且至少另外一个位平面存储字符的低分辨率颜色数据。属性平面包括对应于亮度平面中的字符箱的每个n位宽乘以一个像素深部分的相应的n位存储位置集，并且至少定义了前景和背景的颜色和/或强度相对于单个扫描线的字符框宽度的字符。本说明书还描述了一种图形显示终端，其中亮度和属性平面中的数据可以被选择性地解码为如上所述存储的字母数字数据，或者作为位映射图形数据。

2. 发明授权

US4604614A Video display system employing pulse stretching to compensate for image distortion 失效
标题翻译：视频显示系统采用脉冲拉伸补偿图像失真
公开(公告)号：US4604614A
公开(公告)日：1986-08-05
申请号：US536116
申请日：1983-09-26
申请人： Robert W. E. Farr , Ian D. Judd
发明人： Robert W. E. Farr , Ian D. Judd
IPC分类号： G09G5/36 , G09G1/00 , G09G3/20 , G09G5/00 , G09G5/24 , G09G5/32 , G09G1/06
CPC分类号： G09G1/002 , G09G3/2014
摘要： In order to compensate for image distortion introduced into a digitally-controlled raster-scan CRT by the finite video amplifier rise and fall times, the digital video drive waveform is subject to selective pulse stretching to extend where possible the duration of pels which represent critical features of the image. This is achieved by decoding means for examining each pel at least in relation to its two immediate neighbors on either side in order to detect predetermined relationships between the values of the pels, and retiming means for selectively advancing or delaying the transitions between consecutive pels of different value in accordance with the relationships so detected.In one embodiment, suitable for multibit or single bit video, the decoding means comprises means (40, 25) for comparing each pel with its immediate successor, a shift register (26 to 28) for storing the result of each comparison together with the results of a plurality of immediately preceding comparisons, and a logic circuit (30 to 33) connected to the shift register stages, and the retiming means comprises a delay path (41 to 44) for the waveform having an output register (44) and means (34 to 39) responsive to the logic circuit for clocking the output register at a predetermined time in relation to non-selected transitions, earlier than the said predetermined time in relation to transitions selected for advancement, and later than the said predetermined time in relation to transitions selected for delay.
摘要翻译：为了通过有限的视频放大器上升和下降时间来补偿引入到数字控制的光栅扫描CRT中的图像失真，数字视频驱动波形经受选择性脉冲拉伸，以在可能的情况下延伸表示关键特征的像素的持续时间的图像。这通过解码装置来实现，用于至少相对于其两侧的两个立即邻居检查每个像素，以便检测像素的值之间的预定关系，以及重新定时装置，用于选择性地前进或延迟不同的连续像素之间的转换根据所检测的关系值。在一个实施例中，适用于多位或单位视频，解码装置包括用于将每个像素与其立即后继者进行比较的装置（40,25），用于将每个比较的结果与结果一起存储的移位寄存器（26至28）和与移位寄存器级连接的逻辑电路（30至33），并且重定时装置包括用于具有输出寄存器（44）的波形的延迟路径（41至44）和装置 34至39）响应于所述逻辑电路，用于在相对于未选择的转变的预定时间对所述输出寄存器进行计时，所述预定时间早于所选择的用于提前的转换，并且晚于所述预定时间选择延迟的转换。

3. 发明授权

US4835722A Curve generation in a display system 失效
标题翻译：显示系统中的曲线生成
公开(公告)号：US4835722A
公开(公告)日：1989-05-30
申请号：US118597
申请日：1987-11-09
申请人： David A. Clarke , Robert W. E. Farr
发明人： David A. Clarke , Robert W. E. Farr
IPC分类号： G06T11/00 , G06T11/20 , G09G1/08 , G09G5/20
CPC分类号： G09G5/20 , G09G1/08
摘要： A curve generator for a display system with an arc generator has for generating an arc (10) of a circle (14) from data defining the locations of two end points P.sub.1 and P.sub.3 and an intermediate point P.sub.2 on the arc. The arc generator has an initializer (40) for calculating the angle subtended between a first vector (21), from a first of the end points, P.sub.1 to the intermediate point P.sub.2, and a second vector (32), from the second of the end points P.sub.3 to the intermediate point P.sub.2, and an arc plotter (44) for defining a succession of further vectors n1 from the first end point P.sub.1 and for calculating, for each further vector, its point of intersection P.sub.n with a counterpart vector 3n, from the second end point P.sub.3, with which it subtends the same angle, whereby a succession of further points P.sub.n are plotted on the circular arc.

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