CN116494644A - Resolution-adjustable gravure halftone amplitude modulation screening method - Google Patents
Resolution-adjustable gravure halftone amplitude modulation screening method Download PDFInfo
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- CN116494644A CN116494644A CN202310011900.5A CN202310011900A CN116494644A CN 116494644 A CN116494644 A CN 116494644A CN 202310011900 A CN202310011900 A CN 202310011900A CN 116494644 A CN116494644 A CN 116494644A
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- image
- halftone
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- net
- adjustable
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012216 screening Methods 0.000 title claims abstract description 18
- 238000007639 printing Methods 0.000 claims abstract description 31
- 238000005457 optimization Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 12
- 238000013507 mapping Methods 0.000 claims description 12
- 238000004220 aggregation Methods 0.000 claims description 3
- 230000002776 aggregation Effects 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000007646 gravure printing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F9/00—Rotary intaglio printing presses
Abstract
The invention discloses a resolution-adjustable gravure halftone amplitude modulation screening method. The user obtains halftone images meeting different requirements through self-defining output resolution, self-defining net wall parameters, self-defining net hole shapes and the like. The method mainly comprises the following steps: parameter definition, net wall image generation, net point growth model definition, model optimization, tone optimization of an image to be processed and halftone processing. Compared with the prior art, the method and the device have the advantages that the pixel blocks of the halftone image (m) are mapped through the pixel blocks of the original image (n x n), the defect of outputting fixed resolution images is overcome, and the actual printing effect is improved through optimizing the image tone. The method has the advantages of low operation complexity, good effect and the like, and has extremely high value in actual printing.
Description
Technical Field
The invention relates to the field of printing, in particular to a resolution-adjustable gravure halftone amplitude modulation screening method.
Background
Gravure printing is one of four traditional printing modes in printing, is also one of the main current printing modes, wherein halftoning is a key technology of image printing output, and the invention provides a halftoning amplitude modulation screening method for gravure printing with adjustable resolution aiming at the current situation that only a plurality of resolution outputs are supported at present.
In the aspect of solving dynamic resolution output, the invention obtains the corresponding halftone image based on the mode of mapping the pixel blocks of the halftone image (m) by the pixel blocks of the original image (n x n), thereby changing the general single-to-multiple mapping mode. So that the user can obtain a corresponding halftone image according to the actual printing requirements and printer capabilities. And the printing quality of the image is improved under the condition of not increasing the complexity of the algorithm.
The invention is based on the principle, and designs a whole set of algorithm to obtain a halftone image, comprising the following steps: parameter definition, net wall image generation, net point growth model definition, model optimization, tone optimization of an image to be processed and halftone processing.
Disclosure of Invention
The invention aims to meet the actual printing requirement and provides a resolution-adjustable gravure halftone amplitude modulation screening method.
The technical scheme adopted for solving the technical problems is as follows:
the method changes the defect of outputting fixed resolution images by mapping half-tone image (m) pixel blocks of original image (n x n) pixel blocks, and plays a role in improving actual printing effect by optimizing image tone.
(1) Defining parameters;
(2) Generating a net wall image;
(3) Defining a net point growth model;
(4) Model optimization;
(5) Optimizing the tone of the image to be processed;
(6) Halftone processing;
further, a corresponding halftone image is obtained by mapping the pixel blocks of the halftone image (m) with the pixel blocks of the original image (n×n).
Further, the specific implementation method of the resolution-adjustable gravure printing halftone amplitude modulation screening method comprises the following steps:
(1) Parameter definition
According to the actual printing output requirement, the user designates corresponding output resolution, net wall, net hole shape and other parameters;
(2) Net wall image generation
Mathematical modeling is carried out on parameters such as the shape of the net wall, the shape of the net hole and the like, and a designated net wall image is generated;
(3) Mesh point growth model definition
And (3) separating the single net hole model layer by adopting a specific method, and carrying out spiral assignment from inside to outside to ensure that the net hole model has a good shape-preserving effect.
(4) Model optimization
Locally optimizing the established dot growth model to ensure that the obtained dots under each gray level meet the actual printing requirement; through grooves can be added at the dark tone parts according to the requirements to enhance the effect of the printed image;
(5) Tone optimization of images to be processed
In order to reduce the requirement of actual printing on the capability of printing equipment, the quality of a printed image is improved, and the gathering operation is carried out on the brightness-adjusted part of the image, so that the halftone image cannot generate too small dots;
(6) Halftoning
The corresponding halftone image is obtained by mapping the pixel blocks of the halftone image (m) by using the pixel blocks of the original image (n x n).
Further, for the network holes with holes, the interpolation sampling method is adopted to strip the network holes layer by layer, and the method of summation of the numerical values of the statistical field is adopted for strip the network holes with the general shapes.
Furthermore, the original image is subjected to tone adjustment, and pixel aggregation can be performed by using an error diffusion algorithm of a random distribution sequence from the designated tone according to the self-defined parameters.
Further, when halftone processing is performed on an image, it is necessary to perform dot random dithering on a pixel subjected to tone processing during halftone processing.
The beneficial effects brought by the invention are as follows:
in the aspect of solving dynamic resolution output, the invention obtains the corresponding halftone image based on the mode of mapping the pixel blocks of the halftone image (m) by the pixel blocks of the original image (n x n), thereby changing the general single-to-multiple mapping mode. So that the user can obtain a corresponding halftone image according to the actual printing requirements and printer capabilities. And the printing quality of the image is improved under the condition of not increasing the complexity of the algorithm.
Drawings
Fig. 1 is an algorithm flow chart of a resolution-adjustable gravure halftone amplitude modulation screening method in an example embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
An embodiment of the present invention provides a resolution-adjustable gravure halftone amplitude modulation screening method, in which a halftone image (m) pixel block is mapped by an original image (n×n) pixel block, so as to change the defect of outputting a fixed number of resolution images, and in which an actual printing effect is improved by optimizing an image tone, the method includes the following steps.
(1) Defining parameters;
(2) Generating a net wall image;
(3) Defining a net point growth model;
(4) Model optimization;
(5) Optimizing the tone of the image to be processed;
(6) Halftone processing;
in an embodiment of the present invention, a corresponding halftone image is obtained by mapping a pixel block of a halftone image (m) with a pixel block of an original image (n×n).
In an embodiment of the present invention, the specific implementation method of the resolution-adjustable gravure halftone amplitude modulation screening method includes the following steps:
(1) Parameter definition
According to the actual printing output requirement, the user designates corresponding output resolution, net wall, net hole shape and other parameters;
(2) Net wall image generation
Mathematical modeling is carried out on parameters such as the shape of the net wall, the shape of the net hole and the like, and a designated net wall image is generated;
(3) Mesh point growth model definition
And (3) separating the single net hole model layer by adopting a specific method, and carrying out spiral assignment from inside to outside to ensure that the net hole model has a good shape-preserving effect.
(4) Model optimization
Locally optimizing the established dot growth model to ensure that the obtained dots under each gray level meet the actual printing requirement; through grooves can be added at the dark tone parts according to the requirements to enhance the effect of the printed image;
(5) Tone optimization of images to be processed
In order to reduce the requirement of actual printing on the capability of printing equipment, the quality of a printed image is improved, and the gathering operation is carried out on the brightness-adjusted part of the image, so that the halftone image cannot generate too small dots;
(6) Halftoning
The corresponding halftone image is obtained by mapping the pixel blocks of the halftone image (m) by using the pixel blocks of the original image (n x n).
In one embodiment of the invention, the method of interpolation sampling is adopted to strip the network holes layer by layer, and the method of summation of statistical field values is adopted to strip the network holes with general shapes.
In an embodiment of the present invention, the original image is subjected to tone adjustment, and pixel aggregation can be performed by using an error diffusion algorithm of a random allocation sequence from a designated tone according to a user-defined parameter.
In one embodiment of the present invention, when halftone processing is performed on an image, it is necessary to perform landing random dithering on a pixel subjected to tone processing during the halftone processing.
The present invention will be described in further detail with reference to examples, but the present invention is not limited to the following examples.
Example 1 cellular, 5080 resolution gravure halftone image
Referring to fig. 1, the method comprises the steps of:
(1) Parameter definition
According to the actual printing output requirement, the user designates the corresponding output resolution as 5080dpi, the net wall, the net hole shape as honeycomb and other parameters;
(2) Net wall image generation
Mathematical modeling is carried out on parameters such as the shape of the net wall, the shape of the net hole and the like, and a designated net wall image is generated;
(3) Mesh point growth model definition
And (3) separating the single honeycomb net hole model layer by adopting a specific method, and performing spiral assignment from inside to outside to ensure that the honeycomb net hole model has a good shape-preserving effect.
(4) Model optimization
Locally optimizing the established dot growth model to ensure that the obtained dots under each gray level meet the actual printing requirement; through grooves can be added at the dark tone parts according to the requirements to enhance the effect of the printed image;
(5) Tone optimization of images to be processed
In order to reduce the requirement of actual printing on the capability of printing equipment, the quality of a printed image is improved, and the gathering operation is carried out on the brightness-adjusted part of the image, so that the halftone image cannot generate too small dots;
(6) Halftoning
The corresponding halftone image is obtained by mapping the pixel blocks of the halftone image (m) by using the pixel blocks of the original image (n x n).
Claims (6)
1. The resolution-adjustable intaglio printing halftone amplitude modulation screening method is characterized in that: the resolution-adjustable gravure halftone amplitude modulation screening method is a gravure screening method capable of defining resolution according to actual requirements, and comprises the following steps:
(1) Defining parameters;
(2) Generating a net wall image;
(3) Defining a net point growth model;
(4) Model optimization;
(5) Optimizing the tone of the image to be processed;
(6) And (5) halftone processing.
2. The resolution-adjustable gravure halftone amplitude modulation screening method according to claim 1, wherein the corresponding halftone image is obtained by mapping the original image (n×n) pixel blocks to the halftone image (m×m) pixel blocks according to the parameters.
3. The resolution-adjustable gravure halftone amplitude modulation screening method according to claim 1, characterized in that it comprises the steps of:
(1) Parameter definition
According to the actual printing output requirement, the user designates corresponding output resolution, net wall, net hole shape and other parameters;
(2) Net wall image generation
Mathematical modeling is carried out on parameters such as the shape of the net wall, the shape of the net hole and the like, and a designated net wall image is generated;
(3) Mesh point growth model definition
Separating single net hole models layer by adopting a specific method, and carrying out spiral assignment from inside to outside to ensure that the net hole models have good shape preserving effect;
(4) Model optimization
Locally optimizing the established dot growth model to ensure that the obtained dots under each gray level meet the actual printing requirement; through grooves can be added at the dark tone parts according to the requirements to enhance the effect of the printed image;
(5) Tone optimization of images to be processed
In order to reduce the requirement of actual printing on the capability of printing equipment, the quality of a printed image is improved, and the gathering operation is carried out on the brightness-adjusted part of the image, so that the halftone image cannot generate too small dots;
(6) Halftoning
The corresponding halftone image is obtained by mapping the pixel blocks of the halftone image (m) by using the pixel blocks of the original image (n x n).
4. A resolution-adjustable gravure halftone amplitude modulation screening method according to claim 1 or 3, wherein the layer-by-layer stripping of the holes is performed by interpolation sampling for holes, and the sum of statistical field values is used for the holes of a general shape.
5. A resolution-adjustable gravure halftone amplitude modulation screening method according to claim 1 or 3, wherein the original image is tone-adjusted, and pixel aggregation is performed by using an error diffusion algorithm of a random distribution sequence from a designated tone according to a custom parameter.
6. The resolution-adjustable gravure halftone amplitude modulation screening method according to claim 1 or 5, wherein when halftone processing is performed on an image, it is necessary to perform landing random dithering during the halftone processing for the gradation-processed pixels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310011900.5A CN116494644A (en) | 2023-01-05 | 2023-01-05 | Resolution-adjustable gravure halftone amplitude modulation screening method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310011900.5A CN116494644A (en) | 2023-01-05 | 2023-01-05 | Resolution-adjustable gravure halftone amplitude modulation screening method |
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| CN116494644A true CN116494644A (en) | 2023-07-28 |
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| CN202310011900.5A Pending CN116494644A (en) | 2023-01-05 | 2023-01-05 | Resolution-adjustable gravure halftone amplitude modulation screening method |
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| CN (1) | CN116494644A (en) |
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- 2023-01-05 CN CN202310011900.5A patent/CN116494644A/en active Pending
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