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Organization of the Orobotech AOI Bitmap

June 25, 2021

Artwork recently created a reader for a bitmap said to be produced by an Orbotech optical inspection machine. However when we viewed the sample files provided to us, it was clear that the arrangment of pixels in this file were organized by "scan" and when stitched together did not represent what one would see when viewing the inspected region from above the board.

An optical inspection machine for printed circuit boards

It appears that the large bitmap is subdivided into sections (perhaps each section represents the scan or pass of the imaging head) and that these sections are "stitched" together vertically. Further, the width of each section does not seem to be identical.

VLBV can perform the following operations on this type of file:

  1. open and display1 the AOI file
  2. extract user defined windows from the AOI file
  3. perform XOR operations on two such AOI files


If you need to view such AOI files, or you need to extract or convert these files into other bitmap formats, then VLBV may be the ideal tool to help you do this.