Pattern check device

Claim 1

In a pattern checking device which receives scanning data obtained by scanning an object within defined window regions adjustable in size, shape and position with a photoelectric converter of the two-dimensional scanning type, and having means for converting the scanned data into pixel binary data representing characteristics of the object scanned, and having means for evaluating the binary data and for producing an output signal indicative of said evaluation, the improvement wherein the means for evaluating comprises: primary decision means for comparing the data from each window region from a group of window regions with upper and lower threshold limits, and for outputting a primary decision result signal when said data falls within the range of said upper and lower limits; secondary decision means for comparing primary decision result signals obtained from the data from the group of window regions with previously stored decision data for said group, and for outputting a pattern check signal indicating whether the pattern appearing in said group of window regions constitutes a good pattern in accordance with said stored decision data; and correlation operation-decision means comprising primary correlation decision means for comparing the data from predefined combinations of window regions with upper and lower threshold limits and for outputting a primary correlation decision result signal when said combined data is within the range of said upper and lower limits, and secondary correlation decision means for comparing the primary correlation decision result signals from predefined window region data and for outputting a correlation pattern check signal indicating whether a pattern appearing in said group of window regions constitutes a good pattern in accordance with previously stored correlation primary decision data.