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公开(公告)号：US4583123A
公开(公告)日：1986-04-15
申请号：US704360
申请日：1985-02-22
CPC分类号： H04N5/23212 , G02B7/36
摘要： In this circuit, video signals with a continuously increasing or decreasing amplitude are applied to the signal input of a threshold difference comparator at whose reference inputs selectively determined high and low threshold signals are applied. The output of the threshold difference comparator is applied at the first input of a threshold AND gate having a second input connected to a clock. The output of the threshold AND gate supplies a clock pulse sequence which has a duration corresponding with the time during which the input video signal has an amplitude which continuously increases or decreases from one of the threshold reference amplitudes to the other. The clock pulse sequences contained in successive measuring intervals have their respective pulses counted by a counter, and are stored in a buffer. A measurement series is performed corresponding to different focus settings, optimum focus adjustment being achieved when a minimum count of clock pulses in a clock pulse sequence is obtained.
摘要翻译： 在该电路中，具有连续增加或减小的幅度的视频信号被施加到阈值差分比较器的信号输入端，其中参考输入选择性地确定施加了高和低阈值信号。 阈值差分比较器的输出被施加在具有连接到时钟的第二输入的阈值AND门的第一输入端。 阈值与门的输出提供时钟脉冲序列，其具有与输入视频信号具有从阈值参考幅度之一连续增加或减小的幅度的时间相对应的持续时间。 连续测量间隔中包含的时钟脉冲序列具有由计数器计数的各自脉冲，并存储在缓冲器中。 对应于不同的焦点设置执行测量系列，当获得时钟脉冲序列中的时钟脉冲的最小计数时，实现最佳聚焦调整。
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公开(公告)号：US4570180A
公开(公告)日：1986-02-11
申请号：US498333
申请日：1983-05-26
申请人： Heinz Baier , Peter Kopp , Martin Schneiderhan , Hans-Peter Reimann , Hans Rosch , Erwin Pfeffer
发明人： Heinz Baier , Peter Kopp , Martin Schneiderhan , Hans-Peter Reimann , Hans Rosch , Erwin Pfeffer
IPC分类号： G01N21/88 , G01B11/24 , G01N21/956 , G01R31/28 , G01R31/309 , G06T7/00 , H04N7/18
CPC分类号： G06T7/001 , G01B11/24 , G01R31/2806 , G01R31/309 , G06T2207/30141 , G06T2207/30148
摘要： Method and apparatus for automatic optical inspection of a substantially two-dimensional pattern using digital image processing techniques are described. In a first processing step, all regions of a digitized stored image derived from the two-dimensional pattern are scanned for edges or lines, that is, transitions between regions having optically different characteristics. The scanned edge regions are marked in the image storage. In a subsequent second processing step all non-marked regions of the image storage are scanned and tested for the presence of permissible grey levels. A meander-shaped scanning track is used for scanning the edge or lined regions. The apparatus for implementing this method includes special latch circuitry for eliminating the further processing of marked regions, thus increasing the overall speed at which the two-dimensional pattern can be optically inspected.
摘要翻译： 描述了使用数字图像处理技术对基本上二维图案进行自动光学检查的方法和装置。 在第一处理步骤中，针对边缘或线扫描从二维图案导出的数字化存储的图像的所有区域，即具有光学不同特性的区域之间的转变。 扫描的边缘区域被标记在图像存储器中。 在随后的第二处理步骤中，图像存储器的所有未标记区域被扫描并测试是否存在允许的灰度级。 曲折形扫描轨道用于扫描边缘或内衬区域。 用于实现该方法的装置包括用于消除标记区域的进一步处理的特殊锁存电路，从而增加可以对二维图案进行光学检查的整体速度。
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