High speed defect detection apparatus having defect detection ci

Details High speed defect detection apparatus having defect detection ci High speed defect detection apparatus having defect detection ci

1991-11-19

1995-08-08

Mancuso, Joseph

Image analysis

Histogram processing

For setting a threshold

356430, 348133, 348 88, H04N 718, G01N 2189

Patent

active

054406480

ABSTRACT:
A 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.

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