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Automatic visual inspection system (1)

建立日期：2018/02/21
  • 作者： Orbotech
  • 出處： USPTO-美國專利商標局
  • 內容： 本篇內容為Orbotech相當早期的專利，提出於1993年，獲證於June 30, 1998。在1993年提出此發明之後，Orbotech陸續提出改良，將於第二～四篇中介紹。

    下文為專利摘要，專利全文請連結參考網址，瀏覽專利全文所需看圖軟體請至 http://www.alternatiff.com/ 下載。

    A binary map of an object having edges is produced by first producing a digital grey scale image of the object with a given resolution, and processing the grey scale image to produce a binary map of the object at a resolution greater than said given resolution. Processing of the grey scale image includes the step of convolving the 2-dimensional digital grey scale image with a filter function related to the second derivative of a Gaussian function forming a 2-dimensional convolved image having signed values. The location of an edge in the object is achieved by finding zero crossings between adjacent oppositely signed values. Preferably, the zero crossings are achieved by an interpolation process that produces a binary bit map of the object at a resolution greater than the resolution of the grey scale image. The nature of the Gaussian function whose second derivative is used in the convolution with the grey scale image, namely its standard deviation, is empirically selected in accordance with system noise and the pattern of the traces on the printed circuit board such that the resulting bit map conforms as closely as desired to the lines on the printed circuit board.


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