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Method for detecting and compensating for defective printing nozzles in an inkjet printing machine using a threshold calculation based on weighting factors
Method for detecting and compensating for defective printing nozzles in an inkjet printing machine using a threshold calculation based on weighting factors
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机译:使用基于加权因子的阈值计算来检测和补偿喷墨打印机中不良打印喷嘴的方法
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摘要
A method for detecting and compensating defective printing nozzles in an inkjet printing machine includes periodically printing at least one printing nozzle test chart having horizontal rows of equidistant vertical lines underneath one another, with only nozzles contributing to the test chart in every row corresponding to horizontal rows, and printing an area coverage element geometrically associated with the test chart. Both elements are recorded by an image sensor and evaluated by a computer. The computer identifies print defects by evaluating the area coverage element and allocates the defects to defective nozzles. The computer evaluates the test chart based on thresholds to detect defective nozzles and compensate detected defective nozzles. The computer compares the detected defective nozzles from the area coverage element and the test chart to identify detected defective nozzles causing defects in only one element and calculates the thresholds based thereon to minimize the detected defective nozzles.
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