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    • 99. 发明授权
    • Method and apparatus for filtering and caching data representing images
    • 用于过滤和缓存表示图像的数据的方法和装置
    • US06738526B1
    • 2004-05-18
    • US09364647
    • 1999-07-30
    • Claude BetriseyBodin DresevicJohn C. Platt
    • Claude BetriseyBodin DresevicJohn C. Platt
    • G06K940
    • G06T11/203G09G5/28G09G2320/0276G09G2320/0285G09G2340/0457G09G2340/10
    • Methods and apparatus for displaying images, e.g., text characters, on display devices which have multiple separately controllable luminance elements per pixel are described. Multiple alpha values are generated per pixel, e.g., one per pixel sub-component. Filtering is then performed to generate a filtered alpha value for each pixel sub-component. The filtering operation uses as its input multiple alpha values, e.g., 5 per pixel. The alpha values used for the filtering operation may come from neighboring pixels. Accordingly, in the case where character glyphs are combined to form larger images, e.g., text strings, the filtering operation performed on glyph edge pixels depends on the content of a neighboring character glyph. In one embodiment unfiltered alpha values used to represent character glyphs are stored in a glyph cache. After caching, the unfiltered alpha values from multiple glyphs are combined and then the filtering operation is performed. To avoid repeated filtering of character glyphs, in another embodiment, character glyphs are padded along their vertical edges, filtered and then stored in the glyph cache. Glyphs are output from the cache as required and then combined with filtered alpha values corresponding to overlapping image portions being summed. As a result of the summing processes, correct filtered alpha values are generated along glyph edges for the combined image corresponding to multiple glyphs.
    • 描述了在具有每个像素具有多个可单独控制的亮度元素的显示设备上显示图像(例如,文本字符)的方法和装置。 每像素生成多个α值,例如每像素一个子分量。 然后执行滤波以为每个像素子分量生成滤波的α值。 滤波操作用作其输入多个α值,例如每像素5个。 用于滤波操作的alpha值可能来自相邻像素。 因此,在字符字形被组合以形成较大图像(例如文本串)的情况下,对字形边缘像素执行的滤波操作取决于相邻字符字形的内容。 在一个实施例中,用于表示字符字形的未过滤的α值被存储在字形缓存中。 缓存后,将来自多个字形的未过滤的α值组合,然后进行过滤操作。 为了避免字符字形的重复过滤,在另一个实施例中,字符字形沿其垂直边缘被填充,被过滤并存储在字形缓存中。 字形根据需要从高速缓存输出,然后与对应于重叠图像部分相加的滤波的α值组合。 作为求和过程的结果,对应于多个字形的组合图像,沿着字形边缘生成正确的滤波的α值。
    • 100. 发明授权
    • Pen drawing computer input device
    • 笔绘电脑输入设备
    • US06380929B1
    • 2002-04-30
    • US08717435
    • 1996-09-20
    • John C. Platt
    • John C. Platt
    • G09G500
    • G06F3/0488
    • A method and system are provided for drawing or writing using an input device in computer systems. The system provides an absolute-coordinate drawing mode, in which the user may draw written strokes to which the computer system display is responsive, and a relative-coordinate repositioning mode, in which the user may figuratively “pick up the pen” and reposition the beginning of a following written stroke. The system enters the drawing mode in response to a user command, and remains in the drawing mode in response to continued written strokes. The system enters the cursor mode after a selected time period occurs with no written strokes, or in response to other user commands. In the drawing mode, a coordinate system for the touchpad is mapped to a coordinate system for a selected window on the display. The mapping is selected so that an initial position of a written stroke in the window corresponds to a final position selected during the cursor mode, so that the user is able to reposition the input device when it has (or is about to) “run off the edge” of an input tablet which is relatively smaller than the display. The system uses either a resistive touchpad input tablet, or a capacitive touchpad input tablet in conjunction with a passive stylus input device having a flexible conductive writing tip. The system alternatively provides a signature mode, in which the user is able to make a simple drawing, such as a handwritten signature.
    • 提供了一种使用计算机系统中的输入设备进行绘图或书写的方法和系统。 该系统提供绝对坐标绘制模式,其中用户可以绘制计算机系统显示器所响应的写入笔画,以及相对坐标重新定位模式,其中用户可以形象地“拿起笔”并重新定位 开始以下笔画。 系统响应于用户命令进入绘图模式,并响应于继续写入笔画而保持在绘图模式。 在没有写入笔画或响应其他用户命令的选定时间段之后,系统进入光标模式。 在绘图模式中,用于触摸板的坐标系被映射到显示器上所选窗口的坐标系。 选择该映射,使得窗口中的写入笔画的初始位置对应于在光标模式期间选择的最终位置,使得用户能够在输入设备(或将要)运行时重新定位输入设备 输入图形输入板的边缘“,其比显示器小。 该系统使用电阻式触摸板输入平板电脑或电容式触摸板输入平板电脑与具有柔性导电写入尖端的被动触控笔输入装置。 系统交替地提供签名模式,其中用户能够进行简单的绘图,例如手写签名。