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公开(公告)号：US4454507A
公开(公告)日：1984-06-12
申请号：US336751
申请日：1982-01-04
摘要： A system for writing cursors on a raster scanned television screen that uses the microprocessor in a display controller to produce blocks of data defining the parameters of vectors that compose the cursor. The blocks are put in a first-in first-out memory during a vertical blanking inerval or during active picture time. Each block specifies where writing of a cursor segment is to start and stop on a horizontal scan line and it also specifies a repeat count that indicates the number of lines on which the segment is to be written. Each block contains a delta value to indicate how much, if any each segment is to be displaced left or right from line to line so vertical and angulated vertical vectors can be produced. The blocks are read out of the memory consecutively by a circuit that converts the segment start and stop data to pixel counts. Pixel counters determine the writing start and stop points. When the number of horizontal lines on which segments are written equals the repeat count, the next block is processed.
摘要翻译： 用于在光栅扫描的电视屏幕上写入光标的系统，其使用显示控制器中的微处理器产生定义组成光标的向量参数的数据块。 在垂直消隐异常或激活的图像时间期间，这些块被置于先进先出的存储器中。 每个块指定在水平扫描行上开始和停止光标段的写入位置，并且还指定重复计数，该重复计数指示段要写入的行数。 每个块包含一个增量值，用于指示多少（如果有的话）每个段要从一行到另一个位移左或右，因此可以产生垂直和垂直的垂直向量。 通过将段开始和停止数据转换为像素数的电路连续地从存储器中读出块。 像素计数器确定写入起点和停止点。 当写入片段的水平线数等于重复计数时，处理下一个块。
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公开(公告)号：US4438495A
公开(公告)日：1984-03-20
申请号：US321008
申请日：1981-11-13
CPC分类号： G06T5/009 , G06T2207/10081 , G06T2207/10116 , Y10S378/901
摘要： Apparatus for applying a gamma correction to digital CT numbers at a selected level and within a window. A memory is loaded sequentially with the gamma correction lookup table. At the start a counter generates a sequence of addresses, in response to clock pulses. These are addresses to another memory. Simultaneously, a variable address generator addresses the gamma lookup table memory to effect transfer of the gamma correction data to the other memory (window-gamma lookup table) at locations that are represented by the ratio of the locations in the gamma lookup table to the address in the window-gamma table. To read out and produce an image, the window black value is subtracted from the stored CT numbers in sequence. The resulting differences constitute addresses to the window-gamma lookup table whose output is then the gamma corrected values for CT numbers in the window. This digitized data is converted to analog video signals for driving a television monitor that displays the image.
摘要翻译： 用于在选定的级别和窗口内对数字CT号码应用伽马校正的装置。 使用伽马校正查找表顺序加载存储器。 开始时，响应于时钟脉冲，计数器产生地址序列。 这些是另一个内存的地址。 同时，可变地址发生器寻址伽马查找表存储器，以在由伽马查找表中的位置与地址的比率表示的位置处，将伽马校正数据传送到另一个存储器（窗 - 伽马查找表） 在窗口-γ表中。 为了读出并产生图像，依次从存储的CT编号中减去窗口黑色值。 所得到的差异构成了窗口伽马查找表的地址，其输出是窗口中CT编号的伽马校正值。 该数字化数据被转换为模拟视频信号，用于驱动显示图像的电视监视器。
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公开(公告)号：US4680709A
公开(公告)日：1987-07-14
申请号：US670595
申请日：1984-11-13
CPC分类号： G06T11/005
摘要： Image reconstruction time in a CT scanner is enhanced by using a pipeline structure and interpolation techniques to identify each detector for use in back projection of radiation aborption measurements through each pixel in each view of the scanner. In a preferred embodiment, detectors are identified by calculation for a pixel in every third view with detectors for intermediate views obtained by interpolation of the calculated detectors. Similarly, detectors are identified for every other pixel in a view with the detector for the intermediate pixel identified by interpolation.
摘要翻译： 通过使用流水线结构和内插技术来增强CT扫描仪中的图像重建时间，以识别每个检测器用于通过扫描仪每个视图中的每个像素进行辐射吸收测量的反投影。 在优选实施例中，通过对每个第三视图中的像素的计算来识别检测器，其中通过对所计算的检测器进行插值而获得的用于中间视图的检测器。 类似地，对于通过内插识别的中间像素的检测器，在视图中为每个其他像素识别检测器。
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