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Rev 121 Rev 122
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        labelLeft = labelRight;
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        labelLeft = labelRight;
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        labelRight = data[col];
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        labelRight = data[col];
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        // labels need to be non-background, and differ in exactly one bit
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        // labels need to be non-background, and differ in exactly one bit
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        if(labelLeft != -1 && labelRight != -1 && countBits(labelLeft^labelRight) == 1){
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        if(labelLeft != -1 && labelRight != -1 && (grayToBinary(labelRight) == grayToBinary(labelLeft)+1)){
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            int orderingRelation = (labelLeft << Nbits) + labelRight;
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            int orderingRelation = (labelLeft << Nbits) + labelRight;
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            // store left label column
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            // store left label column
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            edges.push_back(cv::Vec4i(col-1, labelLeft, labelRight, orderingRelation));
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            edges.push_back(cv::Vec4i(col-1, labelLeft, labelRight, orderingRelation));
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        }
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        }
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    }
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    }