发明名称 |
Patch measurement device and method |
摘要 |
<p>In a patch measurement device, a data storage section stores printed-image data including a control strip on a printed material. Based on the pixel values constituting printed-image data stored in the data storage section, a patch position detection section detects the position of a patch. A color density measurement section measures the color density of the patch whose position has been detected by the patch position detection section. A correlation coefficient Ám between a key pattern x and subject data y which is calculated by a reference mark detection section is represented as Ám=([x]*[y])-([x] -1 *[y]), where [x]*[y] is a sum of multiplication products of corresponding elements of the two matrices. Matrix [x] -1 represents an inverted pattern of the key pattern x. Even if the subject data y is of an unrelated pattern resembling the key pattern x having different signal levels from those of the key pattern x, the resultant correlation coefficient Ám has a small value, thereby indicative of a low correlation. The resultant correlation coefficient Ám also becomes small if the subject data y is that of a solid patch, due to cancellation by a drastic subtraction.</p> |
申请公布号 |
EP1273444(A2) |
申请公布日期 |
2003.01.08 |
申请号 |
EP20020014638 |
申请日期 |
2002.07.02 |
申请人 |
DAINIPPON SCREEN MFG. CO., LTD. |
发明人 |
YAMAMOTO, TAKAHARU;OKUDA, TSUYOSHI |
分类号 |
B41F33/00;(IPC1-7):B41F33/00 |
主分类号 |
B41F33/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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