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51.发明授权Electrooptic TIR light modulator image bar having multiple electrodes per pixel 失效每个像素具有多个电极的电光TIR光调制器图像条
公开(公告)号：US5189548A
公开(公告)日：1993-02-23
申请号：US816452
申请日：1991-12-31
申请人： David L. Hecht
发明人： David L. Hecht
CPC分类号： G02F1/0327 , G02F1/315 , G02F2202/20 , G02F2203/12
摘要： Increasing the addressing capability of an optical image bar having a particular pixel center-to-center spacing (pixel pitch) is accomplished by employing a plurality of N electrodes per pixel. Compared to an optical image bar with one electrode per pixel, this provides N times as many locations for the electric potential transition which establishes the center of the pixel. The provision of multiple electrodes per pixel interval can be used to implement interlacing.
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公开(公告)号：US5138340A
公开(公告)日：1992-08-11
申请号：US624117
申请日：1990-12-06
申请人： Robert A. Sprague , Mark S. Bernstein , Robert P. Kowalski , David L. Hecht , David L. Steinmetz , David E. Kizer , Robert L. Thornton
发明人： Robert A. Sprague , Mark S. Bernstein , Robert P. Kowalski , David L. Hecht , David L. Steinmetz , David E. Kizer , Robert L. Thornton
IPC分类号： G06K15/12
CPC分类号： G06K15/12
摘要： A technique for producing pixel patterns at different selected wavelengths. A diode laser is repeatedly pulsed and has its temperature changed from pulse to pulse, which causes the output wavelength to change. This allows pixel patterns to be interlaced by the use of dispersive elements such as prisms in the optical train. A temperature shift of about 15.degree. C. provides a wavelength shift of about 30 angstroms, which is usable. A temperature shift of 20.degree. C.-30.degree. C. or more is preferable. The temperature shifts may be accomplished by supplying specific currents below threshold and above threshold. For two-wavelength operation, the laser is driven at a first bias current below threshold for a first non-illumination interval, at a first pulse current above threshold for a first illumination interval, at a second bias current below threshold for a second non-illumination interval, and a second pulse current above threshold for a second illumination interval. The bias currents are sufficiently different so as to establish different operating temperatures for the illumination intervals. The temperature shifts may also be accomplished at least in part by use of an auxiliary heater.
摘要翻译： 用于产生不同选定波长的像素图案的技术。 二极管激光器被反复脉冲并且其温度从脉冲变为脉冲，这导致输出波长改变。 这允许像素图案通过使用诸如光学列中的棱镜的色散元件来隔行扫描。 约15℃的温度偏移提供约30埃的波长位移，这是可用的。 温度变化优选为20℃-30℃以上。 温度漂移可以通过提供低于阈值和高于阈值的特定电流来实现。 对于双波长操作，对于第一非照明间隔，激光器以低于第一非照明间隔的第一偏置电流被驱动，在第一照明间隔的第一脉冲电流高于阈值时，在第二非 - 照明间隔和第二脉冲电流高于第二照明间隔的阈值。 偏置电流充分不同，从而为照明间隔建立不同的工作温度。 至少部分地通过使用辅助加热器也可以实现温度漂移。
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公开(公告)号：US06982821B2
公开(公告)日：2006-01-03
申请号：US10443725
申请日：2003-05-22
申请人： David L. Hecht
发明人： David L. Hecht
IPC分类号： G02F1/33
CPC分类号： G02F1/0121 , G02F1/33 , G02F2201/58
摘要： A directed beam position sensing system and method includes a beam source configured to emit a beam. A satellite beam generator is aligned to receive the beam and to transmit a main beam portion and to generate a pair of symmetrically positioned satellite beams. A first detector arrangement is positioned to detect a first satellite beam of the pair and to generate a first detector signal. A second detector arrangement is positioned to detect a second satellite beam of the pair, and to generate a second detector signal, wherein the first detector signal and the second detector signal are used to determine a position of the main beam.In accordance with another aspect of the present application, further provided is a second pair or satellite beams, wherein the first pair of satellite beams is generated at one of an x axis or a y axis, and the second pair of satellite beams is generated in the other axis. The first pair of satellite beams and second pair of satellite beams being perpendicular to each other and including third and fourth detectors to detect the position of the satellite beams.In a further embodiment of the present application, a beam position sensing system includes a beam source configured to generate a directed beam. A satellite beam generator is aligned to receive the directed beam and to transmit a main beam and generate a single-sided satellite beam at a known position. A detector arrangement positioned to detect the satellite beam generates a detector signal. The detector signal is then used to determine the position of the main beam.In accordance with another aspect of the present application, the satellite beam generator is a scanning satellite beam generator which scans the satellite beams, while transmitting a main beam substantially undisturbed.
摘要翻译： 定向光束位置检测系统和方法包括被配置为发射光束的光束源。 对准卫星光束发生器以接收光束并传输主光束部分并产生一对对称定位的卫星光束。 第一检测器装置被定位成检测该对的第一卫星束并产生第一检测器信号。 第二检测器装置被定位成检测该对的第二卫星束，并且产生第二检测器信号，其中第一检测器信号和第二检测器信号用于确定主波束的位置。 根据本申请的另一方面，还提供了第二对或卫星波束，其中第一对卫星波束在x轴或ay轴之一处产生，并且第二对卫星波束在 其他轴。 第一对卫星光束和第二对卫星光束彼此垂直并且包括第三和第四检测器以检测卫星光束的位置。 在本申请的另一实施例中，光束位置检测系统包括被配置为产生定向光束的光束源。 对准卫星光束发生器以接收定向光束并发射主光束并在已知位置产生单面卫星光束。 定位成检测卫星束的检测器装置产生检测器信号。 然后检测器信号用于确定主梁的位置。 根据本申请的另一方面，卫星波束发生器是扫描卫星波束发生器，其扫描卫星波束，同时传输主波束基本上不受干扰。
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公开(公告)号：USRE38758E1
公开(公告)日：2005-07-19
申请号：US09884759
申请日：2001-06-18
CPC分类号： G06K19/06037 , G06K7/0166 , G06K7/143
摘要： This invention provides self-clocking glyph shape codes for encoding digital data in the shapes of glyphs that are suitable for printing on hardcopy recording media. Advantageously, the glyphs are selected so that they tend not to degrade into each other when they are degraded and/or distorted as a result, for example, of being photocopied, transmitted via facsimile, and/or scanned-in to an electronic document processing system. Moreover, for at least some applications, the glyphs desirably are composed of printed pixel patterns containing nearly the same number of ON pixels and nearly the same number of OFF pixels, such that the code that is rendered by printing such glyphs on substantially uniformly spaced centers appears to have a generally uniform texture. In the case of codes printed at higher spatial densities, this texture is likely to be perceived as a generally uniform gray tone. Binary image processing and convolution filtering techniques for decoding such codes also are disclosed, but this application focuses on the codes.
摘要翻译： 本发明提供了自适应字形形状代码，用于编码适合于在硬拷贝记录介质上打印的字形的数字数据。 有利地，字形被选择为使得当它们被降级和/或变形时，它们趋向于不会相互劣化，例如，被复印，通过传真和/或扫描传输到电子文档处理 系统。 此外，对于至少一些应用，字形理想地由包含几乎相同数量的ON像素和几乎相同数量的OFF像素的印刷像素图案组成，使得通过在基本均匀间隔的中心上打印这样的字形而呈现的代码 似乎具有大致均匀的质地。 在以更高的空间密度打印的代码的情况下，该纹理可能被认为是大致均匀的灰色调。 <？delete-start id =“DEL-S-00001”date =“20050719”？二进制图像处理和卷积滤波技术用于解码这些代码也被公开，但是这个应用集中在代码上。 =“DEL-S-00001”？>
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55.发明授权
公开(公告)号：US5694102A
公开(公告)日：1997-12-02
申请号：US577672
申请日：1995-12-21
申请人： David L. Hecht
发明人： David L. Hecht
摘要： To facilitate the recovery data from an embedded data pattern through the use of a appropriately sized capture window that is randomly positioned within the data pattern, the embedded data pattern is composed of a plurality of identical, one dimensionally or two dimensionally regularly tiled embedded data blocks which contain sufficient spatial addressing information to permit the logical reconstruction of a complete data block from any set of fragments that collectively provide a full cover for the surface area of any one tile. To this end, the capture window is sized to include a shape which is completely registered with the data pattern in which is capable of tiling the recording medium in accordance with the tiling vectors.
摘要翻译： 为了通过使用随机位于数据模式内的适当大小的捕获窗口来从嵌入式数据模式中恢复数据，嵌入式数据模式由多个相同的一维或二维规则的嵌入式数据块组成 其包含足够的空间寻址信息，以允许从任何集合的片段的逻辑重建逻辑重建，这些片段共同为任何一个瓦片的表面区域提供完整的封面。 为此，捕获窗口的尺寸被设计成包括与能够根据平铺向量平铺记录介质的数据模式完全对准的形状。
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56.发明授权Electrooptic TIR light modulator image bar having illumination conditions for optimizing spatial frequency response 失效具有用于优化空间频率响应的照明条件的电光TIR光调制器图像条
公开(公告)号：US5218469A
公开(公告)日：1993-06-08
申请号：US815660
申请日：1991-12-31
申请人： David L. Hecht
发明人： David L. Hecht
CPC分类号： G02F1/0316 , G02F1/0327 , G02F1/315
摘要： A technique for reducing interpixel crosstalk by selecting particular illumination conditions and thus tailoring a portion of the spatial frequency response of an optical image bar. A desirable frequency response is one that approximates sin(.pi.Pf) for absolute values of f less than about 1/P, where f is the spatial frequency and P is the minimum pixel pitch. A skew angle of zero and a grazing angle that is approximately twice the interorder diffraction angle provides the desired cutoff of the response for absolute values of f above about 1/P. The desired frequency response for absolute values of f near zero can be achieved by selecting appropriate values for other physical parameters.
摘要翻译： 一种通过选择特定照明条件并因此调整光学图像条的空间频率响应的一部分来减少像素间串扰的技术。 期望的频率响应是对于f小于约1 / P的绝对值近似于sin（pi Pf）的f，其中f是空间频率，P是最小像素间距。 偏斜角为零，掠射角大约为二次衍射角的两倍，可提供高于约1 / P的f绝对值的响应的期望截止。 通过为其他物理参数选择合适的值，可以获得f接近零的绝对值的期望频率响应。
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公开(公告)号：US5128525A
公开(公告)日：1992-07-07
申请号：US560654
申请日：1990-07-31
CPC分类号： G06K7/143 , G06K19/06037 , G06K9/18
摘要： Weighted and unweighted convolution filtering processes are provided for decoding bitmap image space representations of self-clocking glyph shape codes and for tracking the number and locations of the ambiquities or "errors" that are encountered during the decoding. This error detection may be linked to or compared against the error statistics from an alternative decoding process, such as the binary image processing techniques that are described herein to increase the reliability of the decoding that is obtained.
摘要翻译： 提供加权和未加权卷积滤波处理，用于解码自定时字形形状码的位图图像空间表示，并用于跟踪在解码期间遇到的环境或“错误”的数量和位置。 该错误检测可以链接到来自替代解码过程的错误统计信号，或者与本文所述的二进制图像处理技术相比较以提高所获得的解码的可靠性。
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公开(公告)号：US4751659A
公开(公告)日：1988-06-14
申请号：US089480
申请日：1987-08-26
申请人： David L. Hecht
发明人： David L. Hecht
CPC分类号： G06K15/1271 , G06K15/1261 , H04N1/193
摘要： A discrete image bar having defective pixel generators redundantly addresses all pixel positions within an address space to produce an essentially defect free image. To that end, the footprint of the pixel generators of the image bar is shifted back and forth across an integer number of pixel positions widthwise of the address space as a function of time, and the input data for the image bar is synchronously countershifted in the opposite direction across an equal number of pixel generators, thereby sequentially bringing at least two different pixel generators into imaging alignment with each pixel position, without materially affecting the address space alignment of the input data. All of the defective pixel generators of the image bar are disabled, so the input data for them are shifted onto non-defective pixel generators after a suitable time delay, whereby the image corresponding to this shifted data is superimposed, sequentially in time, on the image corresponding to the unshifted data for the non-defective pixel generators. These partial images are recorded on a suitable recording medium, thereby causing them to incoherently spatially sum with each other to create an essentially defect free image of the spatial pattern represented by the input data.
摘要翻译： 具有缺陷像素发生器的离散图像条冗余地寻址地址空间内的所有像素位置，以产生基本上无缺陷的图像。 为此，图像条的像素生成器的占地面积作为时间的函数在地址空间的宽度方向上跨越整数个像素位置来回移动，并且图像条的输入数据被同步地在 从而顺序地使至少两个不同的像素发生器与每个像素位置进行成像对准，而不会实质上影响输入数据的地址空间对准。 图像条的所有有缺陷的像素生成器被禁用，因此在适当的时间延迟之后，它们的输入数据被移动到无缺陷像素生成器上，由此与该移位数据对应的图像在时间上依次叠加在 图像对应于无缺陷像素发生器的未移动数据。 这些部分图像被记录在合适的记录介质上，从而使它们彼此不相干空间地相加以产生由输入数据表示的空间模式的基本上无缺陷的图像。
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