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    • 2. 发明授权
    • Integrated front projection system with distortion correction and associated method
    • 具有失真校正和相关方法的集成前置投影系统
    • US06520646B2
    • 2003-02-18
    • US09746808
    • 2000-12-22
    • Ernesto M. Rodriguez, Jr.Steven G. SaxePatricia H. DeLuca
    • Ernesto M. Rodriguez, Jr.Steven G. SaxePatricia H. DeLuca
    • G03B2114
    • G03B21/10G03B21/145H04N5/74H04N9/3185H04N9/3194
    • A front projection system and associated method are disclosed that correct distortion for a front projector device. The front projector device is characterized by off-axis optics and a throw-to-screen diagonal ratio of at most 1 which generate distortion including pincushion, keystone and anamorphic distortion components. Further, the projection device has an electronic distortion correction component operable to pre-distort an image prior to projection in order to correct for the pincushion, keystone and anamorphic distortion components of the projector device. Further, an associated method is also disclosed for correcting distortion generated in a projection system by a combination of optical and electronic correction. The method comprises setting a limit on the amount of image information that is acceptable to lose through the optical components, and selecting an optical solution is comprising optics having inherent distortion within the set limit. Then, an electronic correction component is selected that is operable to pre-distort an image to correct for remaining distortion not corrected by the optics of the optical solution.
    • 公开了一种前投影系统和相关方法,用于校正前投影仪装置的失真。 前置放映机装置的特征在于离轴光学元件和至多1的歪斜对角线比例,其产生包括枕形,梯形失真和变形失真分量的失真。 此外,投影装置具有电子失真校正部件,其可操作以在投影之前对图像进行预失真,以便校正投影仪设备的枕形,梯形失真和变形失真部件。 此外,还公开了一种用于通过光学和电子校正的组合校正投影系统中产生的失真的相关方法。 该方法包括设置通过光学部件损失的可接受的图像信息量的限制,并且选择光学解决方案包括在设定极限内具有固有失真的光学器件。 然后,选择电子校正组件,其可操作用于对图像进行预失真以校正未被光学解决方案的光学器件校正的剩余失真。
    • 3. 发明授权
    • Solid state optical reader with bi-directional protocol
    • 具有双向协议的固态光学读卡器
    • US5444230A
    • 1995-08-22
    • US159734
    • 1993-11-30
    • Dwight G. BaldwinJames K. KennedySteven G. Saxe
    • Dwight G. BaldwinJames K. KennedySteven G. Saxe
    • G06K7/14G06K7/10
    • G06K7/14
    • An apparatus for reading an optical bar code on a transparent film uses a linear array of light sources and a linear, solid-state sensor located parallel with array. LED's are energized selectively in groups to avoid overlapping shadows on the sensor. A novel algorithm is used to reconstruct the shadowgraphs or image segments by searching for a transition (mark/space edge in the bar code) in an overlap zone at the boundary of adjacent segments on the sensor. Conventional techniques are then used to decode the reconstructed electronic image of the bar code. The apparatus is particularly useful in an electronic presentation system wherein the numeric value of the bar code is an image reference number (IRN) which is used to access a host computer and display a graphic image associated with the IRN. A novel bi-directional protocol is also presented for providing communications between the optical reader and the host computer. The protocol directs the host computer to download all IRN's for a given presentation to the reader. The reader can then locally determine if a bar code on a card corresponds to a valid IRN in the current presentation. The protocol may be adapted to download certain display control information and send associated control signals to the host computer based on keyboard input at the reader.
    • 用于读取透明膜上的光学条形码的装置使用光源的线性阵列和与阵列平行的线性固态传感器。 LED组被选择性地分组,以避免传感器上的重叠阴影。 一种新颖的算法用于通过在传感器上的相邻段的边界处的重叠区域中搜索过渡(条形码中的标记/空格边缘)来重建阴影图像或图像段。 然后使用常规技术对条形码的重建电子图像进行解码。 该装置在电子呈现系统中特别有用,其中条形码的数值是用于访问主计算机并显示与IRN相关联的图形图像的图像参考号(IRN)。 还提出了一种新颖的双向协议,用于在光学读取器和主机之间提供通信。 该协议指示主机将给定演示的所有IRN下载给读卡器。 然后,读者可以在本地确定卡上的条形码是否对应于当前呈现中的有效IRN。 该协议可以适合于下载某些显示控制信息,并且基于在读取器处的键盘输入将关联的控制信号发送到主计算机。