High speed defect detection apparatus having defect detection circuits mounted in the camera housing
August 8, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3920970 Monitoring and control of optical fiber diameters Non-woven fabric defect detecting device Mark signal amplifier Foreign matter detecting device Raster input scanner Data compression interface having parallel memory architecture Method for automatic optical inspection Inspecting device for print System for monitoring and analysis of a continuous process InventorsAssigneeApplicationNo. 794861 filed on 11/19/1991US Classes:382/141, Manufacturing or product inspection348/88, Web, sheet or filament348/133, With circuit detail356/430For flaws or imperfectionsExaminersPrimary: Mancuso, JosephAssistant: Prikockis, Larry J. Attorney, Agent or FirmForeign Patent References
International ClassesH04N 007/18G01N 021/89 AbstractA defect detection system includes a video camera with defect detection circuits for detecting defects in video signals being outputted by corresponding sections of an array sensor such as a TDI CCD two-dimensional array sensor. Each defect detection circuit includes a subtraction circuit for subtracting a prior stored pixel from an incoming pixel to generate a difference. Comparators compare the difference with positive and negative limits defining an acceptable range of difference values. The prior stored pixel is updated to the succeeding pixel only when the difference value is acceptable. Memories store the defect pixels from the respective detection circuits along with X-coordinates and end of line bits. The memories are sequentially read up to their end of line bits, and the defect pixel values along with coordinates expanded to include section indicating bits are transferred from the camera to further processing facilities.Field of SearchBY MONITORING OF WEBS OR THREADFor flaws or imperfections Flaw detector Of electronic circuit chip or board Of transparent container or content (e.g., bottle, jar, etc.) Of surface (e.g., texture or smoothness, etc.) With circuit detail Including line to line comparison Web, sheet or filament | |
