CN1542682A - Method for measuring print error of paper money sample - Google Patents
Method for measuring print error of paper money sample Download PDFInfo
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- CN1542682A CN1542682A CNA2003101031456A CN200310103145A CN1542682A CN 1542682 A CN1542682 A CN 1542682A CN A2003101031456 A CNA2003101031456 A CN A2003101031456A CN 200310103145 A CN200310103145 A CN 200310103145A CN 1542682 A CN1542682 A CN 1542682A
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- banknote
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Abstract
The present invention is banknote sample printing error measuring method and belongs to the field of printing technology. The method includes the first scanning the standard banknote pattern to obtain the standard digital image of standard pattern, scanning the banknote sample to be measured to obtain the digital image of the sample, selecting characteristic blocks in the digital image of the sample with abrupt color change and finding out the relative offset between each characteristic block and corresponding standard image position, shifting the image to be measured based on the relative offset to align the image to be measured and the standard image, and subtracting the chroma of all the corresponding pixels in these two images to obtain the chroma error. The said method can evaluate the print quality of the sample to be measured quantitatively and objectively.
Description
Technical field the present invention relates to a kind of assay method of banknote specimen page printing error, belongs to printing technology.
Background technology is in order to evaluate the printing quality of banknote specimen page, be whether its figure and color be in full accord with the standard specimen page, the general at present method that adopts is with the naked eye to check the difference of specimen page and standard specimen page by experienced checker, this detection method not only wastes time and energy, and can't provide the quantitative description of figure and color distinction, be subjected to the interference of human factor easily, thereby can not make definite evaluation printing quality.
Summary of the invention the objective of the invention is to propose a kind of assay method of banknote specimen page printing error, quantitatively obtain specimen page to be measured and the difference of standard specimen page on figure and color with the method for digital image processing, with this foundation as evaluation specimen page printing quality to be measured.
The assay method of the banknote specimen page printing error that the present invention proposes may further comprise the steps:
(1) the banknote standard pattern is scanned, obtain the standard digital image of standard pattern;
(2) banknote specimen page to be measured is scanned, obtain the digital picture of specimen page to be measured;
(3) on the digital picture of specimen page to be measured, select the violent characteristic block of a plurality of color change, obtain the relative displacement between the characteristic block on this characteristic block and the standard picture relevant position;
(4) according to above-mentioned relative displacement, mobile testing image makes testing image aim at standard picture;
(5) colourity of all the corresponding picture elements on two images is subtracted each other, obtain the error amount on the two colourity.
The assay method of the banknote specimen page printing error that the present invention proposes can be estimated the printing quality of specimen page to be measured quantitatively, objectively, saves time, laborsaving, has avoided the interference of human factor.And use this method to detect, and equipment needed thereby all is proven technique and product, checkout equipment is easy to purchase, operation and maintenance.
Embodiment
The assay method of the banknote specimen page printing error that the present invention proposes at first can be imported computing machine with the pattern of specimen page with the image conversion equipment with sufficiently high how much resolutions and color resolution, forms the standard digital image of banknote specimen page;
With the equipment of specification same as described above the pattern input computing machine of specimen page to be measured is formed the digital picture of banknote to be measured then;
On the digital picture of specimen page to be measured, select the violent characteristic block of a plurality of color change, can select 3 above characteristic blocks, these characteristic blocks are as far as possible near the Si Jiaochu of banknote, obtain the relative displacement between the characteristic block of relevant position on these characteristic blocks and the standard picture;
According to above-mentioned relative displacement, move image to be measured, promptly, image to be measured and reference image are aimed on the whole, i.e. whole as far as possible coincidence the on how much with regard to image rotation to be measured or translation;
The chromatic value of corresponding each picture element on above-mentioned image of having aimed on the whole to be measured and the reference image is subtracted each other, get final product the quantitative description of both difference on each picture element.Needs according to printing quality, set one and judge thresholding, and then evaluate the printing quality of specimen page to be measured quantitatively according to the size of thresholding, for example when the corresponding pixel point of image to be measured and reference image is gone up colour difference less than this thresholding, think that printing error is within allowed band, during greater than thresholding, regard as printing error and exceeded allowed band, thereby can not accept.
Image conversion equipment can adopt color scanner, simulation color video camera and color image capured keystroke, or color digital camera or the like.
The geometric properties of the image conversion equipment of same size can think in full accord, but the color conversion feature generally can respectively have difference, and can slowly change along with the time, need regularly the color conversion characteristic of scanner to be demarcated with the stable same set of color lump of color.
Claims (1)
1, a kind of assay method of banknote specimen page printing error is characterized in that this method may further comprise the steps:
(1) the banknote standard pattern is scanned, obtain the standard digital image of standard pattern;
(2) banknote specimen page to be measured is scanned, obtain the digital picture of specimen page to be measured;
(3) on the digital picture of specimen page to be measured, select the violent characteristic block of a plurality of color change, obtain the relative displacement between the characteristic block on this characteristic block and the standard picture relevant position;
(4) according to above-mentioned relative displacement, mobile testing image makes testing image aim at standard picture;
(5) colourity of the corresponding to some extent picture element on two images is subtracted each other, obtain the error amount on the two colourity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101031456A CN1542682A (en) | 2003-11-05 | 2003-11-05 | Method for measuring print error of paper money sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2003101031456A CN1542682A (en) | 2003-11-05 | 2003-11-05 | Method for measuring print error of paper money sample |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1542682A true CN1542682A (en) | 2004-11-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2003101031456A Pending CN1542682A (en) | 2003-11-05 | 2003-11-05 | Method for measuring print error of paper money sample |
Country Status (1)
| Country | Link |
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| CN (1) | CN1542682A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354144C (en) * | 2004-11-05 | 2007-12-12 | 中国印钞造币总公司 | Quality on-line detection device of value added tax receipt imprint |
| CN101529481B (en) * | 2006-09-06 | 2012-05-30 | 卡巴-诺塔赛斯有限公司 | Method for controlling the quality of printed documents based on pattern matching |
| CN102693442A (en) * | 2012-05-28 | 2012-09-26 | 南昌印钞有限公司 | Novel method and device for tracing corresponding relation between outer packing box and inner packed product |
| CN105741283A (en) * | 2016-01-28 | 2016-07-06 | 青岛易科锐自动化技术有限公司 | Computer color contrast quantitative evaluation method |
-
2003
- 2003-11-05 CN CNA2003101031456A patent/CN1542682A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354144C (en) * | 2004-11-05 | 2007-12-12 | 中国印钞造币总公司 | Quality on-line detection device of value added tax receipt imprint |
| CN101529481B (en) * | 2006-09-06 | 2012-05-30 | 卡巴-诺塔赛斯有限公司 | Method for controlling the quality of printed documents based on pattern matching |
| CN102693442A (en) * | 2012-05-28 | 2012-09-26 | 南昌印钞有限公司 | Novel method and device for tracing corresponding relation between outer packing box and inner packed product |
| CN102693442B (en) * | 2012-05-28 | 2015-02-25 | 南昌印钞有限公司 | Novel method and device for tracing corresponding relation between outer packing box and inner packed product |
| CN105741283A (en) * | 2016-01-28 | 2016-07-06 | 青岛易科锐自动化技术有限公司 | Computer color contrast quantitative evaluation method |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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