CN110303764B - Overprinting method and system - Google Patents
Overprinting method and system Download PDFInfo
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- CN110303764B CN110303764B CN201910604902.9A CN201910604902A CN110303764B CN 110303764 B CN110303764 B CN 110303764B CN 201910604902 A CN201910604902 A CN 201910604902A CN 110303764 B CN110303764 B CN 110303764B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims description 40
- 238000004364 calculation method Methods 0.000 claims description 17
- 239000011159 matrix material Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/08—Print finishing devices, e.g. for glossing prints
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformations in the plane of the image
- G06T3/60—Rotation of whole images or parts thereof
- G06T3/608—Rotation of whole images or parts thereof by skew deformation, e.g. two-pass or three-pass rotation
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Abstract
The invention discloses a overprinting method and a system, which relate to the technical field of printing, the method provided by the invention stores pictures corresponding to various angles which may appear in advance and the angles corresponding to various pictures, the pictures to be overprinted can be called out immediately only by measuring the deflection angle of overprinted media, and then the position of the called out pictures is adjusted, so that the adjustment of the deflection angle of the images can be completed, the time for correction is greatly reduced, the overprinting speed is improved, and the overprinting production efficiency is improved.
Description
Technical Field
The invention relates to the technical field of printing, in particular to a overprinting method and system.
Background
Overprinting refers to a printing process of printing a secondary image on an image-printed medium, such as glazing a pre-printed pattern, and the like, by which the printing effect of the printed medium can be enhanced, and overprinting can be performed for the entire image or only a part of the image.
To achieve good overprint, the overprinted images need to be able to be accurately superimposed onto the original media at predefined locations. In practice, the media may be printed and transported to the imaging section with errors, which may include lateral and longitudinal offsets and angular rotations, which may result in the content to be overprinted not being accurately overprinted in the intended position, thereby affecting the overprinting effect. In the prior art, to solve the problem, a camera is generally used to photograph a medium reaching an imaging position each time, and the photographed image is compared with a photographed image, so that an offset and a rotation angle of the medium relative to a previous medium can be determined, and the image is corrected according to the offset and the rotation angle to obtain a new image, so that the new image can be accurately superimposed on an expected position.
However, the method adopted in the prior art usually needs to stop for several seconds to acquire the corrected image, and then the overprinting can be started, so that the overprinting speed is seriously influenced, one image needs to be printed every second, and the time for correcting the image often exceeds one second, so that the overprinting speed can only be reduced in the actual production, and the production efficiency is influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a overprinting method which improves the production efficiency of overprinting.
In order to achieve the purpose, the invention adopts the following technical scheme:
an overprinting method comprising the steps of:
step S100: acquiring an image to be overprinted;
step S110: acquiring different rotation images of the to-be-overprinted image relative to the standard image at different rotation angles, and enabling the rotation angles to correspond to the rotation images one by one;
step S120: marking a medium to be overprinted;
step S130: acquiring a mark image, and calculating a deflection angle and an offset displacement of the mark image relative to a standard image;
step S140: acquiring a rotation image corresponding to a rotation angle which is the same as the deflection angle;
step S150: adjusting the obtained rotating image according to the offset displacement to obtain a overprintable image;
step S160: the overprintable image is printed on a medium to be overprinted.
Further, the image to be overprinted, the rotated image, the standard image, the marked image and the overprintable image are all grating dot matrix images.
Preferably, in step S110, the rotation angle is-5 ° to +5 °.
Further, in the step S110, a rotation image is acquired every 0.1 °.
Preferably, in step S130, the offset displacement includes a lateral offset displacement and a longitudinal offset displacement with respect to the position of the standard image.
The method provided by the invention has the following beneficial effects:
for the correction of the offset of the overprinting in the printing field, the prior art has adopted a method of adjusting the direction and position of the image to be overprinted to be consistent with the direction and position of the overprinted medium to meet the printing quality requirement. This means that each time the image to be overprinted is printed, it needs to be adjusted once, and each adjustment takes time.
Taking a printing format with a resolution of 600DPI and a format of 520mm × 720mm as an example, the image size is about 24MB, the algorithm for correcting the deviation in the direction of the image X, Y is simple and can be performed in real time at high speed, and the correction of the rotation angle of the image requires recalculation of each pixel point. This is a very time consuming operation, usually in seconds, which requires waiting for the rotation and offset calculation of the image to be completed before a new image is obtained to start printing, and therefore usually requires a pause of several seconds to obtain the corrected image, which inevitably results in slow and inefficient overprinting.
The printing method provided by the application adopts a technical concept completely different from the prior art, the pictures corresponding to various possible angles and the angles corresponding to the various pictures are stored in advance, the picture to be overprinted can be called out immediately only by measuring the deflection angle of the overprinted medium, then the position of the called out picture is adjusted, the time-consuming process of correcting the rotation angle of the picture and recalculating each pixel point is avoided, the adjustment of the deflection angle of the picture is realized in the modes of pre-storing and calling in real time, and the offset correction which can be carried out at high speed in real time is carried out on the called out picture, so that the time for correction is greatly shortened, the overprinting speed is improved, and the overprinting production efficiency is improved.
The present invention therefore enables the person skilled in the art to overcome the ubiquitous knowledge of deviation from objective facts and thus overcome technical prejudices with respect to the technical problem of the correction of the overprint deviations.
In addition, the present invention also provides a overprinting system, comprising:
an asynchronous calling system, the system comprising:
an overprinting system, comprising:
the image acquisition module is used for acquiring a mark image or acquiring the mark image and an image to be overprinted;
the image calculation module is used for acquiring different rotation images of the to-be-overprinted image relative to the standard image at different rotation angles;
the image storage module is used for storing the standard image, different rotating images under different rotating angles and the corresponding relation between the rotating angles and the rotating images, or storing the image to be overprinted, the standard image, the different rotating images under different rotating angles and the corresponding relation between the rotating angles and the rotating images;
the deviation calculation module is used for calculating the deflection angle and the offset displacement of the marked image relative to the standard image;
the adjusting module is used for acquiring a rotating image corresponding to the calculated deflection angle according to the calculated deflection angle and adjusting the rotating image according to the offset displacement;
and the printing module is used for printing the adjusted rotating image on a printing medium to be printed.
Further, the overprinting system also comprises an image conversion module which is used for converting the image to be overprinted and the mark image into a grating dot matrix image.
Preferably, the image calculation module acquires the rotated image at a rotation angle of-5 ° to +5 °.
Further, the image calculation module acquires a rotation image every 0.1 °.
Preferably, the offset displacement calculated by the deviation calculation module includes a lateral offset displacement and a longitudinal offset displacement with respect to a position where the standard image is located.
The overprinting system provided by the invention is similar to the beneficial effect reasoning process of the overprinting method, and is not repeated herein.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings. The best mode or means of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. In addition, the features, elements and components appearing in each of the following and in the drawings are plural and different symbols or numerals are labeled for convenience of representation, but all represent components of the same or similar construction or function.
[ description of the drawings ]
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of a first embodiment of the present invention;
[ detailed description ] embodiments
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Reference in the specification to "one embodiment" or "an example" means that a particular feature, structure or characteristic described in connection with the embodiment itself may be included in at least one embodiment of the patent disclosure. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a superimposition method, including the following steps:
step S100: acquiring an image to be overprinted;
in this step, the image to be overprinted is an image to be printed on the medium to be overprinted, and the image to be overprinted can be captured by a camera or stored in advance, which is not limited herein. And after the image to be overprinted is obtained, converting the image to be overprinted into a grating dot matrix image.
Step S110: acquiring different rotation images of the to-be-overprinted image relative to the standard image at different rotation angles, and enabling the rotation angles to correspond to the rotation images one by one;
in this step, since the rotation angle that may be generated during the overprinting process is small, the rotation angle is set to-5 ° to +5 °, wherein the full overlap of the image to be overprinted and the standard image is 0 °, and the clockwise direction is positive, the counterclockwise direction is negative, or the clockwise direction is negative, and the counterclockwise direction is positive, which is not limited herein. Meanwhile, in view of the accuracy of the superimposition, the smaller the step between two rotations of the image to be superimposed, the higher the accuracy, and it is preferable to take the rotation image every 0.1 ° in the present embodiment. Since the image to be overprinted has already been converted into a raster dot matrix image in step S100, the rotated image after rotation is still a raster dot matrix image. For comparison, the standard image is also a raster dot matrix image. And after all the rotation images are acquired, storing the rotation images, enabling each rotation image to be in one-to-one correspondence with the rotation angle when the rotation image is stored, and storing the corresponding relation.
Step S120: marking a medium to be overprinted;
in this step, the medium to be overprinted is marked for subsequent acquisition, calculation of the offset angle of the medium to be overprinted with respect to the standard image.
Step S130: acquiring a mark image, and calculating a deflection angle and an offset displacement of the mark image relative to a standard image;
in this step, the marker image is also converted to a raster dot matrix image for comparison. And the offset displacement comprises transverse offset displacement and longitudinal offset displacement, namely, relative to the position of the standard image, the offset displacement in the direction of the X coordinate axis is transverse offset displacement, and the offset displacement in the direction of the Y coordinate axis is longitudinal offset displacement. The calculated deflection angle and deflection displacement are the angle and displacement by which the medium to be overprinted is deflected relative to the standard image.
Step S140: acquiring a rotation image corresponding to a rotation angle which is the same as the deflection angle;
in this step, a rotated picture with the same deflection angle as the medium to be overprinted is found out according to the deflection angle calculated in the previous step and the corresponding relationship between the rotation angle and the rotated picture stored in step S110.
Step S150: adjusting the obtained rotating image according to the offset displacement to obtain a overprintable image;
in the previous step, only the rotation image with the rotation angle equal to the deflection angle of the medium to be overprinted is found out, but the offset displacement of the medium to be overprinted on the X axis and the offset displacement of the medium to be overprinted on the Y axis still exist, so that in the step, the offset displacement of the medium to be overprinted on the X axis and the offset displacement of the medium to be overprinted on the Y axis are adjusted, the angle and the position of the medium to be overprinted and the adjusted rotation image are completely identical, and thus, the overprintable image which can be printed on the medium is obtained. Since each of the rotated images stored in the previous step is a raster dot matrix image, the overprintable image is also a raster dot matrix image.
Step S160: printing the overprintable image on the medium to be overprinted, finishing all printing if the printing is finished, returning to the step S130 if the printing is not finished, and repeating the steps S130 to S160 until the printing is finished.
For the correction of the offset of the overprinting in the printing field, the prior art has adopted a method of adjusting the direction and position of the image to be overprinted to be consistent with the direction and position of the overprinted medium to meet the printing quality requirement. This means that each time the image to be overprinted is printed, it needs to be adjusted once, and each adjustment takes time.
Taking a printing format with a resolution of 600DPI and a format of 520mm × 720mm as an example, the image size is about 24MB, the algorithm for correcting the deviation in the direction of the image X, Y is simple and can be performed in real time at high speed, and the correction of the rotation angle of the image requires recalculation of each pixel point. This is a very time consuming operation, usually in seconds, which requires waiting for the rotation and offset calculation of the image to be completed before a new image is obtained to start printing, and therefore usually requires a pause of several seconds to obtain the corrected image, which inevitably results in slow and inefficient overprinting.
The printing method provided by the embodiment adopts a technical concept completely different from the prior art, the pictures corresponding to various possible angles and the angles corresponding to the various pictures are stored in advance, the picture to be overprinted can be called out immediately only by measuring the deflection angle of the overprinted medium, and then the position of the called out picture is adjusted, so that the time-consuming process of correcting the rotation angle of the picture and recalculating each pixel point is avoided, the adjustment of the deflection angle of the picture is realized in the modes of storing in advance and calling in real time, and the offset correction which can be carried out at high speed in real time is carried out on the called out picture, so that the time for correction is greatly reduced, the overprinting speed is improved, and the overprinting production efficiency is improved.
Therefore, the embodiment enables the technical person in the field to overcome the ubiquitous knowledge of deviation from objective facts and further overcome the technical prejudice on the technical problem of the offset correction.
Example two:
the present embodiment provides a overprinting system, including:
the image acquisition module is used for acquiring a mark image or acquiring the mark image and an image to be overprinted;
the image calculation module is used for acquiring different rotation images of the to-be-overprinted image relative to the standard image at different rotation angles, wherein the rotation angle of the rotation image acquired by the image calculation module is-5 degrees to +5 degrees, and the rotation image is acquired every 0.1 degree;
the image storage module is used for storing the standard image, different rotating images under different rotating angles and the corresponding relation between the rotating angles and the rotating images, or storing the image to be overprinted, the standard image, the different rotating images under different rotating angles and the corresponding relation between the rotating angles and the rotating images;
and the deviation calculation module is used for calculating the deflection angle and the offset displacement of the mark image relative to the standard image, and the offset displacement calculated by the deviation calculation module comprises a transverse offset displacement and a longitudinal offset displacement relative to the position of the standard image. (ii) a
The adjusting module is used for acquiring a rotating image corresponding to the calculated deflection angle according to the calculated deflection angle and adjusting the rotating image according to the offset displacement;
the printing module is used for printing the adjusted rotating image on a printing medium to be printed;
and the image conversion module is used for converting the image to be overprinted and the marked image into a grating dot matrix image.
While the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. An overprinting method, characterized in that it comprises the following steps:
step S100: acquiring an image to be overprinted;
step S110: acquiring different rotation images of the to-be-overprinted image relative to the standard image at different rotation angles, and enabling the rotation angles to correspond to the rotation images one by one;
step S120: marking a medium to be overprinted;
step S130: acquiring a mark image, and calculating a deflection angle and an offset displacement of the mark image relative to a standard image;
step S140: acquiring a rotation image corresponding to a rotation angle which is the same as the deflection angle;
step S150: adjusting the obtained rotating image according to the offset displacement to obtain a overprintable image;
step S160: the overprintable image is printed on a medium to be overprinted.
2. The overprinting method according to claim 1, wherein: the image to be overprinted, the rotating image, the standard image, the marking image and the overprintable image are all grating dot matrix images.
3. The overprinting method according to claim 1, wherein: in step S110, the rotation angle is-5 ° to +5 °.
4. The overprinting method according to claim 3, wherein: in step S110, a rotation image is acquired every 0.1 °.
5. The overprinting method according to claim 1, wherein: in step S130, the offset displacement includes a lateral offset displacement and a longitudinal offset displacement relative to the position of the standard image.
6. An overprinting system, comprising: the overprinting system includes:
the image acquisition module is used for acquiring a mark image or acquiring the mark image and an image to be overprinted;
the image calculation module is used for acquiring different rotation images of the to-be-overprinted image relative to the standard image at different rotation angles;
the image storage module is used for storing the standard image, different rotating images under different rotating angles and the corresponding relation between the rotating angles and the rotating images, or storing the image to be overprinted, the standard image, the different rotating images under different rotating angles and the corresponding relation between the rotating angles and the rotating images;
the deviation calculation module is used for calculating the deflection angle and the offset displacement of the marked image relative to the standard image;
the adjusting module is used for acquiring a rotating image corresponding to the calculated deflection angle according to the calculated deflection angle and adjusting the rotating image according to the offset displacement;
and the printing module is used for printing the adjusted rotating image on a printing medium to be printed.
7. The overprinting system of claim 6, wherein: the overprinting system also comprises an image conversion module which is used for converting the image to be overprinted and the mark image into a grating dot matrix image.
8. The overprinting system of claim 6, wherein: the rotation angle of the image rotation acquired by the image calculation module is-5 degrees to +5 degrees.
9. The overprinting system of claim 8, wherein: the image calculation module acquires a rotation image every 0.1 degrees.
10. The overprinting system of claim 6, wherein: the offset displacement calculated by the deviation calculation module comprises a transverse offset displacement and a longitudinal offset displacement relative to the position of the standard image.
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| CN110865778A (en) * | 2019-10-15 | 2020-03-06 | 江门市得实计算机外部设备有限公司 | Method, device and equipment for adjusting to-be-printed information of card machine and storage medium |
| CN114454636B (en) * | 2021-12-27 | 2022-12-09 | 深圳市汉森软件有限公司 | Method, device and equipment for printing images by color register offset positioning and storage medium |
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