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    Method and apparatus to scan randomly oriented two-dimensional bar code symbols
    1.
    发明授权
    Method and apparatus to scan randomly oriented two-dimensional bar code symbols 失效
    扫描随机取向的二维条形码符号的方法和装置

    公开(公告)号：US5523552A

    公开(公告)日：1996-06-04

    申请号：US327531

    申请日：1994-10-19

    申请人： Stephen J. Shellhammer ,  Joseph Katz ,  Ron Goldman

    发明人： Stephen J. Shellhammer ,  Joseph Katz ,  Ron Goldman

    IPC分类号： G06K7/015 ,  G06K7/10

    CPC分类号： G06K7/10871

    摘要： Disclosed are methods and apparatus for automatically aligning the field of view of a two dimensional bar code reading device with a randomly oriented two-dimensional bar code symbol wherein the symbol comprises a unique pattern located contiguously on at least one side thereof. One method is implemented in a laser based embodiment by scanning the symbol with a laser scan line extending through the border pattern (which is a PDF417 start codeword), measuring the length of the start codeword detected by the scan line, and rotating the laser scan line by a predetermined amount. This is repeated for a predetermined number of times, and the rotation angle at which the codeword length is smallest is determined by performing a least squares fit of the measured codeword lengths and rotation angles. The raster pattern is then rotated to the determined rotation angle so as to be aligned with the symbol for subsequent scanning and decoding. In the alternative, a sequential least squares fit can be performed after each start codeword measurement is made rather than waiting for all measurements to be made. An alternative embodiment implements a discrete radial CCD array comprised of linear CCD arrays which enables angular scanning of the target symbol, wherein a two-dimensional CCD array is then rotated either physically or logically by the calculated skew angle in order to be aligned with the symbol for imaging and subsequent processing and decoding.

    摘要翻译： 公开了用于将二维条形码读取装置的视野自动对准随机取向的二维条形码符号的方法和装置，其中符号包括在其至少一侧上连续定位的唯一图案。 一种方法在基于激光的实施例中通过用延伸穿过边界图案的激光扫描线（其是PDF417起始码字）扫描符号，测量由扫描线检测的起始码字的长度，以及旋转激光扫描 行预定量。 这被重复预定次数，并且通过执行测量的码字长度和旋转角度的最小二乘拟合来确定码字长度最小的旋转角度。 然后将光栅图案旋转到所确定的旋转角度，以便与用于后续扫描和解码的符号对齐。 在替代方案中，可以在进行每个开始码字测量之后执行顺序的最小二乘拟合，而不是等待进行所有测量。 一个替代实施例实现了由线性CCD阵列组成的离散径向CCD阵列，其能够对目标符号进行角度扫描，其中二维CCD阵列然后物理或逻辑地旋转所计算的偏斜角，以便与符号对齐 用于成像和后续处理和解码。

    Laser projection display
    2.
    发明授权
    Laser projection display 有权
    激光投影显示

    公开(公告)号：US07369584B2

    公开(公告)日：2008-05-06

    申请号：US10883479

    申请日：2004-06-30

    申请人： Ron Goldman ,  Paul Dvorkis ,  Joseph Katz ,  Narayan Nambudiri ,  Miklos Stern ,  Chinh Tan ,  Carl Wittenberg ,  Frederick F. Wood ,  Dmitriy Yavid

    发明人： Ron Goldman ,  Paul Dvorkis ,  Joseph Katz ,  Narayan Nambudiri ,  Miklos Stern ,  Chinh Tan ,  Carl Wittenberg ,  Frederick F. Wood ,  Dmitriy Yavid

    IPC分类号： H01S3/10

    CPC分类号： H04N9/3129

    摘要： A method and apparatus are provided for controlling the operation of a Laser Projection Display (LPD). Generally, the LPD is comprised of a laser, an optical system and a controller. The laser is adapted to emit a beam of laser light. The optical system is adapted to scan the beam of laser light on a display surface in a two-dimensional raster pattern. The controller is adapted to control the rate at which the laser beam is scanned to produce regions of varying resolution on the display surface. The controller is also adapted to present laser light onto the display surface within only selected portions of the two-dimensional raster scan pattern so that spaced apart image regions may be created.

    摘要翻译： 提供了一种用于控制激光投影显示器（LPD）的操作的方法和装置。 通常，LPD由激光器，光学系统和控制器组成。 激光器适于发射激光束。 光学系统适于以二维光栅图案扫描显示表面上的激光束。 控制器适于控制激光束被扫描的速率，以在显示表面上产生不同分辨率的区域。 该控制器还适于在仅在二维光栅扫描图案的选定部分内的显示表面上呈现激光，使得可以产生间隔开的图像区域。