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A system is disclosed for converting visual information pertaining to a product into digital data for processing with suitable hardware in order to detect defects in the product.
English (United States)
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Defects Detection by Spacial Correlation of Images
A system is disclosed for converting visual information pertaining to a
product into digital data for processing with suitable hardware in order to detect
defects in the product.
The product used in the illustrated system is an integrated circuit module
which could have up to 72 pins, each having a preferred diameter of .020 inch.
For these modules to be satisfactorily inserted into a printed circuit, the pins must
be straight, must not be oversized as from solder buildup, and they must not be
missing or broken off. The disclosed system will identify if any of these defects
exist in the module.
With reference to Fig. 1, a vidicon camera views the top of the pins of the
product module. A signal representing the light shining from the pins is detected
by a video slicer which provides threshold level detection. The video slicer
produces a logic signal for each pin (1 in Figs. 1, 2 and 3), which is synchronized
with the camera. The camera is synchronized by a cathode ray tube controller
(CRTC). The CRTC also acts as a character generator and generates a signal
pattern corresponding to the maximum deviation allowable for the pins on the
circuit board under test (2 in Figs. 1, 2 and 3). Both signals 1 and 2 are
correlated and chopped into picture elements and totalized by counters (Fig. 2).
After a full video frame is loaded into random-- access memory (RAM), the
missing pin and oversized pin tests are performed by the...