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    • 1. 发明授权
    • Correction for scan period variation in optical image scanners
    • 光学图像扫描仪扫描周期变化的校正
    • US4369365A
    • 1983-01-18
    • US256597
    • 1981-04-22
    • John BedfordGraham M. Clarke
    • John BedfordGraham M. Clarke
    • H04N3/02G01B11/00G02B26/10G02B26/12G02B27/00H01J3/14
    • G02B27/0031G01B11/00G02B26/127
    • Correction for variations in scan period of optical image scanners includes measuring and storing the scan times at which optical events occur to cause image detector signals, detecting an optical marker near the end of the scan and the scan time of its detection, determining the difference between this scan time and a stored scan period, comprising the nominal scan time for marker detection, which difference represents the scan period error, dividing the difference by the stored scan period to provide a scan time unit error and multiplying each stored measured scan time by the unit error to provide a correction for each measured scan time, thereafter adding the correction to the stored measured scan time to give a corrected scan time.
    • 光学图像扫描仪的扫描周期变化的校正包括测量和存储发生光学事件的扫描时间,以引起图像检测器信号,检测在扫描结束附近的光学标记和其检测的扫描时间,确定 该扫描时间和存储的扫描周期包括用于标记检测的标称扫描时间,该差表示扫描周期误差,将差除以所存储的扫描周期以提供扫描时间单位误差,并将每个存储的测量扫描时间乘以 单位错误,以对每个测量的扫描时间提供校正,然后将校正添加到所存储的测量扫描时间以给出校正的扫描时间。
    • 2. 发明授权
    • Discrimination circuit arrangements
    • 歧视电路安排
    • US4155012A
    • 1979-05-15
    • US794511
    • 1977-05-06
    • Graham M. ClarkeJohn Bedford
    • Graham M. ClarkeJohn Bedford
    • G01N21/88G01N21/89G01N21/892G01N21/93G06T7/00H03K5/1252H04L25/06G01N21/32
    • H04L25/062G01N21/89
    • A discrimination circuit operable to discriminate between an input signal in the form of a pedestal and disturbance signals superimposed thereon has an A-D converter to digitize a disturbance-free reference pedestal signal, circulating shift register to store the digitized reference signal, a D-A converter to produce a pedestal signal from the reference signal, a controlling clock to shift the reference signal in the store in synchronism with the incoming signal such that the two pedestal signals are available together, and a comparator to compare the reference signal with the input signal to produce an output caused by differences due to disturbances. The circuit forms part of an optical surface inspection apparatus.
    • 用于区分基座形式的输入信号和叠加在其上的干扰信号之间的识别电路具有AD转换器,用于数字化无干扰参考基准信号,循环移位寄存器以存储数字化参考信号,DA转换器产生 来自参考信号的基座信号;控制时钟,用于与输入信号同步地移动存储器中的参考信号,使得两个基座信号一起可用;以及比较器,用于将参考信号与输入信号进行比较,以产生 输出由于扰动引起的差异。 该电路形成光学表面检查装置的一部分。