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| Paper Hole Defect Detection Based on Depth of Field Imaging |
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| DOI：10.11981/j.issn.1000-6842.2016.03.45 |
| Key Words:depth of field； calibration； paper hole defect； aberration； detection |
| Fund Project:河南省科技厅鉴定项目(预科鉴委字［2014］第663号)。 |
| Author Name | Affiliation | | 张慧宁 | 黄河水利职业技术学院,河南开封,475004 | | 王 磊 | 黄河水利职业技术学院,河南开封,475004 |
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| Abstract: |
| In order to overcome the limitations of traditional optical method for detecting the hole defect on the paper, the depth of field imaging method was proposed. First, measurement models were established, which included optical depth of field model and imaging geometric model. Then through CCD imaging measurement process deduction, video output signal was related to the depth of defect point only. Finally residual factor of aberration model was used to improve accuracy of measurement. Experimental result showed that the measure results were more close to the real size of the paper hole, the accuracy of measurement was higher than traditional optical and manual measurements. |
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