CN104469080A - High-quality character output two-bit halftone method for laser printer - Google Patents
High-quality character output two-bit halftone method for laser printer Download PDFInfo
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- CN104469080A CN104469080A CN201410802121.8A CN201410802121A CN104469080A CN 104469080 A CN104469080 A CN 104469080A CN 201410802121 A CN201410802121 A CN 201410802121A CN 104469080 A CN104469080 A CN 104469080A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
- H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
- H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/58—Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction
Abstract
The invention discloses a high-quality character output two-bit halftone method for a laser printer. The method includes the steps that a file to be printed, which is input by a user, is used as an output source file to conduct primary comparison with an amplitude modulation threshold matrix, so that a halftone file which only has two exposure states is generated; before secondary comparison is conducted, feature edge points are selected first, then, secondary comparison is conducted on the grey value of the corresponding position of the file to be printed and the mid-value of the grey level, so that a halftone file with four exposure states is generated; at last, a half-exposure laser printer is controlled to conduct outputting according to the halftone file. By means of the high-quality character output two-bit halftone method for the laser printer, the character edge display effect is effectively improved in the outputting process, and the adjusting effect of the two-bit halftone method is obvious.
Description
Technical field
The invention belongs to digital image processing techniques field, be specifically related to two halftoning methods that a kind of laser printer high-quality word exports.
Background technology
File to be printed and the built-in AM threshold value matrix of printer, after the order receiving mimeograph documents, are carried out a threshold comparison and generate halftoning file by printer.Be usually used in the file printed out, most of region of word is on the spot, presents step-wise transition in the gray scale of marginal portion.In threshold matrix, value arrangements mode, the i.e. generating mode of site, for presenting step-wise transition from central point toward surrounding, therefore in halftoning file, word edge easily presents the shape of half site.This halftoning file printout exported, word edge presents " waveform ", asks for an interview Fig. 1.For this phenomenon, by suitably increasing or reducing exposure area, word edge can be made to realize good transition, improves word output quality.Two halftoning methods that the present invention proposes, the basis of a threshold comparison increases second time contrast, generates two halftoning files, according to the exposure area of two halftoning document control half exposed laser printers, adjustment word edge, effectively improves word output quality.
In the prior art, two general halftoning methods are, reach different shades produce four state of value by the amount out of ink controlling ink powder.Two halftoning algorithms of the present invention, half exposed laser printer of employing is by controlling exposure position, an exposure point in the middle of a former halftoning is divided into two parts in left and right, controls exposure respectively, to realize the change of four values.
Summary of the invention
For promoting word edge output quality, the present invention proposes two halftoning methods that a kind of laser printer high-quality word exports.
The technical solution adopted in the present invention is: two halftoning methods that a kind of laser printer high-quality word exports, and it is characterized in that, comprises the following steps:
Step 1: according to file to be printed A, first carry out first time contrasts with AM threshold value matrix B, generates the halftoning file C only having full exposure and do not expose two states;
Step 2: get edge feature point and do second time contrast in halftoning file C, edge feature point can be divided into left edge feature point and right edge feature point;
Step 3: after twice contrast, obtains the halftoning file C of four kinds of exposure status, realizes two halftoning methods according to this, then exports according to this halftoning document control half exposed laser printer.
As preferably, the specific implementation flow process of step 1 is as follows:
Judge whether the value A (x, y) of file to be printed is less than value B (x%16, y%16) corresponding to threshold matrix, and " % " represents that remainder operates;
When the value A (x, y) of file to be printed is more than or equal to value B (x%16, y%16) corresponding to threshold matrix, the exposure status of halftoning file correspondence position C (x, y) is set to not expose;
When the value A (x, y) of file to be printed is less than value B (x%16, y%16) corresponding to threshold matrix, the exposure status of halftoning file correspondence position C (x, y) is set to full exposure.
As preferably, judgement and the second time contrast flow process of the edge feature point described in step 2 are as follows:
(1) if the optional position C (x of halftoning file C, y) exposure status is full exposure, C (x, y-1) exposure status is not for expose, and the exposure status of C (x-dx, y+dy) is full exposure, dx and dy is empirical value herein, then can judge that C (x, y) is as left edge feature point; Putting before this, checking the relevant value in file to be printed A, if the value of A (x, y) is more than or equal to the intermediate value of tonal gradation, then transferring the exposure status of C (x, y) to right exposure by full exposure; If the value of A (x, y) is less than the intermediate value of tonal gradation and the value of A (x, y-1) is less than the intermediate value of tonal gradation, then transfer the exposure status of C (x, y-1) to right exposure by not exposing;
(2) if the optional position C (x of halftoning file C, y) exposure status is full exposure, C (x, y+1) exposure status is not for expose, and C (x+dx, y-dy) exposure status is full exposure, then can judge that C (x, y) is as right edge feature point; Putting before this, checking the relevant value in file to be printed A, if the value of A (x, y) is more than or equal to the intermediate value of tonal gradation, then transferring the exposure status of C (x, y) to left exposure by full exposure; If the value of A (x, y) is less than the intermediate value of tonal gradation and the value of A (x, y+1) is less than the intermediate value of tonal gradation, then transfer the exposure status of C (x, y+1) to left exposure by not exposing.
As preferably, described empirical value dx and dy is as edge feature point Rule of judgment, its obtaining value method is: the adjacent amplitude centre distance on the screen angle direction formed after the median contrast of AM threshold value matrix and tonal gradation is H and W, the unit of H and W is respectively row in AM threshold value matrix and row, in conjunction with actual printout result on the basis of H and W, fine setting H and W obtains empirical value dx and dy.
Two halftoning methods that the laser printer high-quality word that the present invention proposes exports, using the file to be printed of user's input as output source file, do with AM threshold value matrix and contrast for the first time, generate the halftoning file only having two kinds of exposure status.First get edge feature point before second time contrast, then the gray value of file to be printed relevant position and the intermediate value of tonal gradation are done and are contrasted for the second time, generate the halftoning file of four kinds of exposure status.Finally export according to halftoning document control half exposed laser printer.The present invention improves the display effect at the word edge when exporting effectively, and two halftoning method Adjustment effect are remarkable.
Accompanying drawing explanation
Fig. 1: be a halftoning file output word edge effect figure of background technology of the present invention.
Fig. 2: be the exposure inking part that not the exposing of half exposed laser printer of the embodiment of the present invention, right exposure, left exposure and full exposure are corresponding.
Fig. 3: be the flow chart of the embodiment of the present invention.
Fig. 4: be the shadow printout result figure before two halftoning methods adjustment of the present invention.
Fig. 5: be the shadow printout result figure after two halftoning methods adjustment of the present invention.
Fig. 6: be the high light printout result figure before two halftoning methods adjustment of the present invention.
Fig. 7: be the high light printout result figure after two halftoning methods adjustment of the present invention.
Fig. 8: be the lena printout result figure before two halftoning methods adjustment of the present invention.
Fig. 9: be the lena printout result figure after two halftoning methods adjustment of the present invention.
Figure 10: be the English printout partial result figure before two halftoning methods adjustment of the present invention.
Figure 11: be the English printout partial result figure after two halftoning methods adjustment of the present invention.
Figure 12: be the Chinese printout partial result figure before two halftoning methods adjustment of the present invention.
Figure 13: be the Chinese printout partial result figure after two halftoning methods adjustment of the present invention.
Figure 14: be the second time contrast schematic diagram of the embodiment of the present invention 1.
Figure 15: be the second time contrast schematic diagram of the embodiment of the present invention 2.
Figure 16: be the second time contrast schematic diagram of the embodiment of the present invention 3.
Figure 17: be the second time contrast schematic diagram of the embodiment of the present invention 4.
Embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, below in conjunction with drawings and Examples, the present invention is described in further detail, should be appreciated that exemplifying embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Technical scheme provided by the invention carries out two halftoning method adjustment for the file to be printed of user, and the span of the gray value of the file of user's input is [0,255].According to the file to be printed of user, carry out secondary contrast and generate corresponding two halftoning files.In first time contrast, the value of the optional position of file to be printed compared with the value in corresponding AM threshold value matrix, if be less than the value in threshold matrix, then the exposure status of the corresponding position of halftoning file is set to full exposure, otherwise is set to not expose.In second time contrast, in halftoning file, first get edge feature point, edge feature point minute left edge feature point and right edge feature point.If the value of corresponding left edge feature point position is more than or equal to 128 in file to be printed, then transfer the exposure status of the left edge feature point in two halftoning files to right exposure by full exposure; If the value of corresponding left edge feature point position is less than 128 and the value of the left consecutive points of corresponding left edge feature point position is less than 128 in file to be printed, then transfer the exposure status of the left consecutive points of the left edge feature point in two halftoning files to right exposure by not exposing.If the value of corresponding right edge feature point position is more than or equal to 128 in file to be printed, then transfer the exposure status of the right edge feature point in two halftoning files to left exposure by full exposure; If the value of corresponding right edge feature point position is less than 128 and the value of the right consecutive points of corresponding right edge feature point position is less than 128 in file to be printed, then transfer the exposure status of the right consecutive points of the right edge feature point in two halftoning files to left exposure by not exposing.Four kinds of exposure status are had in two the halftoning files generated after secondary contrast.Four kinds of exposure status of half exposed laser printer, ask for an interview Fig. 2.
Ask for an interview Fig. 3, be the flow chart of the embodiment of the present invention, comprise the following steps:
Step 1, according to the printing demand of user, user sends the print command of file to be printed A to printer, and the gray value span of file to be printed A is [0,255], itself and AM threshold value matrix B is done and contrasts for the first time, generates halftoning file C.The concrete grammar generating halftoning file C is as follows,
As the value A (x of the optional position of file to be printed A, y) value is less than the B (x%16 in the middle of corresponding threshold matrix B, y%16), " % " represents that remainder operates, then by halftoning file C corresponding position C (x, y) exposure status is set to full exposure, otherwise is set to not expose;
Step 2, in halftoning file C, get edge feature point do second time contrast, edge feature point can be divided into left edge feature point and right edge feature point.Judgement and the second time contrast flow process of edge feature point are as follows,
(1) as the optional position C (x of halftoning file C, y) exposure status is full exposure, C (x, y-1) exposure status is not for expose, and the exposure status of C (x-dx, y+dy) is full exposure, dx, dy are herein empirical value, lower same, then can judge that C (x, y) is as left edge feature point.Putting before this, checking the relevant value in file to be printed A.If the value of A (x, y) is more than or equal to 128, then transfer the exposure status of C (x, y) to right exposure by full exposure; If the value of A (x, y) is less than 128 and the value of A (x, y-1) is less than 128, then transfer the exposure status of C (x, y-1) to right exposure by not exposing;
(2) as the optional position C (x of halftoning file C, y) exposure status is full exposure, C (x, y+1) exposure status is not for expose, and C (x+dx, y-dy) exposure status is full exposure, then can judge that C (x, y) is as right edge feature point.Putting before this, checking the relevant value in file to be printed A.If the value of A (x, y) is more than or equal to 128, then transfer the exposure status of C (x, y) to left exposure by full exposure; If the value of A (x, y) is less than 128 and the value of A (x, y+1) is less than 128, then transfer the exposure status of C (x, y+1) to left exposure by not exposing.
Empirical value dx, dy are herein as edge feature point Rule of judgment, and its obtaining value method is as described below.The adjacent amplitude centre distance that the intermediate value 128 of AM threshold value matrix and tonal gradation contrasts on the screen angle direction of rear formation is H and W, the unit of H and W is respectively row in AM threshold value matrix and row, in conjunction with actual printout result on the basis of H and W, fine setting H and W obtains empirical value dx and dy.
After twice contrast, obtain the halftoning file C of four kinds of exposure status, realize two halftoning methods according to this, then export according to this halftoning document control half exposed laser printer.
Resolution chart of the present invention is shadow image, high-key image, lena image, English image and Chinese image.Under the prerequisite of AM threshold value matrix of the present invention, the printout result figure before and after two halftoning method adjustment is as shown in Fig. 4-Figure 13.From Fig. 4-Figure 13, technical scheme of the present invention had both ensured the basic reduction of image contrast information, and the high-quality realizing again word exports.
Embodiment 1, in the present embodiment, according to the am screening matrix adopted, empirical value dx value is 4, dy value is 3, and the idiographic flow of embodiment is:
File to be printed A, the value of certain some A (x, y) is 145, the value of A (x, y-1) is 160, A (x-dx, y+dy) value is 10, in threshold matrix B, and B (x%16, y%16) value is 175, the value of B (x%16, (y-1) %16) is 15, B ((x-dx) %16, (y+dy) %16) value be 12, the adjustment process based on two halftoning methods is as follows.
Step 1, according to file to be printed A, first carry out first time contrasts with AM threshold value matrix B, and generate the halftoning file C only having full exposure and do not expose two kinds of exposure status, flow process is as follows:
Judge whether the value A (x, y) of file to be printed is less than value B (x%16, y%16) corresponding to threshold matrix, and result is yes, and the exposure status of halftoning file correspondence position C (x, y) is set to full exposure;
Judge the value A (x of file to be printed, y-1) whether be less than value B corresponding to threshold matrix (x%16, (y-1) %16), result is no, the exposure status of halftoning file correspondence position C (x, y-1) is set to not expose;
Judge the value A (x-dx of file to be printed, y+dy) value B corresponding to threshold matrix ((x-dx) %16 whether is less than, (y+dy) %16), result is yes, the exposure status of halftoning file correspondence position C (x-dx, y+dy) is set to full exposure.
Step 2, get edge feature point and do second time contrast, edge feature point can be divided into left edge feature point and right edge feature point.Judgement and the second time contrast flow process of edge feature point are as follows, and legend asks for an interview Figure 14, and in figure, numerical value is the gray value of relevant position in file to be printed A:
In this halftoning file, the exposure status of C (x, y) is full exposure, C (x, y-1) exposure status is not for expose, and the exposure status of C (x-dx, y+dy) is full exposure, then judge that C (x, y) is as left edge feature point.Check the value 145 of the A (x, y) of correspondence position in file to be printed, its value is greater than 128, then transfer the exposure status of C (x, y) to right exposure by full exposure.
Embodiment 2, in the present embodiment, according to the am screening matrix adopted, empirical value dx value is 4, dy value is 3, and the idiographic flow of embodiment is:
File to be printed A, the value of certain some A (x, y) is 70, the value of A (x, y-1) is 120, A (x-dx, y+dy) value is 5, in threshold matrix B, and B (x%16, y%16) value is 82, the value of B (x%16, (y-1) %16) is 6, B ((x-dx) %16, (y+dy) %16) value be 9, the adjustment process based on two halftoning methods is as follows.
Step 1, according to file to be printed A, first carry out first time contrasts with AM threshold value matrix B, and generate the halftoning file C only having full exposure and do not expose two kinds of exposure status, flow process is as follows:
Judge whether the value A (x, y) of file to be printed is less than value B (x%16, y%16) corresponding to threshold matrix, and result is yes, and the exposure status of halftoning file correspondence position C (x, y) is set to full exposure;
Judge the value A (x of file to be printed, y-1) whether be less than value B corresponding to threshold matrix (x%16, (y-1) %16), result is no, the exposure status of halftoning file correspondence position C (x, y-1) is set to not expose;
Judge the value A (x-dx of file to be printed, y+dy) value B corresponding to threshold matrix ((x-dx) %16 whether is less than, (y+dy) %16), result is yes, the exposure status of halftoning file correspondence position C (x-dx, y+dy) is set to full exposure.
Step 2, get edge feature point and do second time contrast, edge feature point can be divided into left edge feature point and right edge feature point.Judgement and the second time contrast flow process of edge feature point are as follows, and legend asks for an interview Figure 15, and in figure, numerical value is the gray value of relevant position in file to be printed A:
In this halftoning file, the exposure status of C (x, y) is full exposure, C (x, y-1) exposure status is not for expose, and the exposure status of C (x-dx, y+dy) is full exposure, then judge that C (x, y) is as left edge feature point.Check that the value 70 of the A (x, y) of correspondence position in file to be printed is less than 128 and the value 120 of A (x, y-1) is less than 128, then transfer the exposure status of C (x, y-1) to right exposure by not exposing.
Embodiment 3, in the present embodiment, according to the am screening matrix adopted, empirical value dx value is 4, dy value is 3, and the idiographic flow of embodiment is:
File to be printed A, the value of certain some A (x, y) is 140, the value of A (x, y+1) is 179, A (x+dx, y-dy) value is 20, in threshold matrix B, and B (x%16, y%16) value is 224, the value of B (x%16, (y+1) %16) is 67, B ((x+dx) %16, (y-dy) %16) value be 73, the adjustment process based on two halftoning methods is as follows.
Step 1, according to file to be printed A, first carry out first time contrasts with AM threshold value matrix B, and generate the halftoning file C only having full exposure and do not expose two kinds of exposure status, flow process is as follows:
Judge whether the value A (x, y) of file to be printed is less than value B (x%16, y%16) corresponding to threshold matrix, and result is yes, and the exposure status of halftoning file correspondence position C (x, y) is set to full exposure;
Judge the value A (x of file to be printed, y+1) whether be less than value B corresponding to threshold matrix (x%16, (y+1) %16), result is no, the exposure status of halftoning file correspondence position C (x, y+1) is set to not expose;
Judge the value A (x+dx of file to be printed, y-dy) value B corresponding to threshold matrix ((x+dx) %16 whether is less than, (y-dy) %16), result is yes, the exposure status of halftoning file correspondence position C (x+dx, y-dy) is set to full exposure.
Step 2, get edge feature point and do second and take turns contrast, edge feature point can be divided into left edge feature point and right edge feature point.Judgement and the second time contrast flow process of edge feature point are as follows, and legend asks for an interview Figure 16, and in figure, numerical value is the gray value of relevant position in file to be printed A:
In this halftoning file, the exposure status of C (x, y) is full exposure, C (x, y+1) exposure status is not for expose, and the exposure status of C (x+dx, y-dy) is full exposure, then judge that C (x, y) is as right edge feature point.Check the value 140 of the A (x, y) of correspondence position in file to be printed, its value is greater than 128, then transfer the exposure status of C (x, y) to left exposure by full exposure.
Embodiment 4, in the present embodiment, according to the am screening matrix adopted, empirical value dx value is 4, dy value is 3, and the idiographic flow of embodiment is:
File to be printed A, the value of certain some A (x, y) is 60, the value of A (x, y+1) is 100, A (x+dx, y-dy) value is 45, in threshold matrix B, and B (x%16, y%16) value is 62, the value of B (x%16, (y+1) %16) is 53, B ((x+dx) %16, (y-dy) %16) value be 57, the adjustment process based on two halftoning methods is as follows.
Step 1, according to file to be printed A, first carry out first time contrasts with AM threshold value matrix B, and generate the halftoning file C only having full exposure and do not expose two kinds of exposure status, flow process is as follows:
Judge whether the value A (x, y) of file to be printed is less than value B (x%16, y%16) corresponding to threshold matrix, and result is yes, and the exposure status of halftoning file correspondence position C (x, y) is set to full exposure;
Judge the value A (x of file to be printed, y+1) whether be less than value B corresponding to threshold matrix (x%16, (y+1) %16), result is no, the exposure status of halftoning file correspondence position C (x, y+1) is set to not expose;
Judge the value A (x+dx of file to be printed, y-dy) value B corresponding to threshold matrix ((x+dx) %16 whether is less than, (y-dy) %16), result is yes, the exposure status of halftoning file correspondence position C (x+dx, y-dy) is set to full exposure.
Step 2, get edge feature point and do second and take turns contrast, edge feature point can be divided into left edge feature point and right edge feature point.Judgement and the second time contrast flow process of edge feature point are as follows, and legend asks for an interview Figure 17, and in figure, numerical value is the gray value of relevant position in file to be printed A:
In this halftoning file, the exposure status of C (x, y) is full exposure, C (x, y+1) exposure status is not for expose, and the exposure status of C (x+dx, y-dy) is full exposure, then judge that C (x, y) is as right edge feature point.Check that the value 60 of the A (x, y) of correspondence position in file to be printed is less than 128 and the value 100 of A (x, y+1) is less than 128, then transfer the exposure status of C (x, y+1) to left exposure by not exposing.
Should be understood that, the part that this specification does not elaborate all belongs to prior art.
Should be understood that; the above-mentioned description for preferred embodiment is comparatively detailed; therefore the restriction to scope of patent protection of the present invention can not be thought; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that the claims in the present invention protect; can also make and replacing or distortion, all fall within protection scope of the present invention, request protection range of the present invention should be as the criterion with claims.
Claims (4)
1. two halftoning methods of laser printer high-quality word output, is characterized in that, comprise the following steps:
Step 1: according to file to be printed A, first carry out first time contrasts with AM threshold value matrix B, generates the halftoning file C only having full exposure and do not expose two states;
Step 2: get edge feature point and do second time contrast in halftoning file C, edge feature point can be divided into left edge feature point and right edge feature point;
Step 3: after twice contrast, obtains the halftoning file C of four kinds of exposure status, realizes two halftoning methods according to this, then exports according to this halftoning document control half exposed laser printer.
2. two halftoning methods of laser printer high-quality word output according to claim 1, is characterized in that: the specific implementation flow process of step 1 is as follows:
Judge whether the value A (x, y) of file to be printed is less than value B (x%16, y%16) corresponding to threshold matrix, and " % " represents that remainder operates;
When the value A (x, y) of file to be printed is more than or equal to value B (x%16, y%16) corresponding to threshold matrix, the exposure status of halftoning file correspondence position C (x, y) is set to not expose;
When the value A (x, y) of file to be printed is less than value B (x%16, y%16) corresponding to threshold matrix, the exposure status of halftoning file correspondence position C (x, y) is set to full exposure.
3. two halftoning methods of laser printer high-quality word output according to claim 1, is characterized in that: judgement and the second time contrast flow process of the edge feature point described in step 2 are as follows:
(1) if the optional position C (x of halftoning file C, y) exposure status is full exposure, C (x, y-1) exposure status is not for expose, and the exposure status of C (x-dx, y+dy) is full exposure, dx and dy is empirical value herein, then can judge that C (x, y) is as left edge feature point; Putting before this, checking the relevant value in file to be printed A, if the value of A (x, y) is more than or equal to the intermediate value of tonal gradation, then transferring the exposure status of C (x, y) to right exposure by full exposure; If the value of A (x, y) is less than the intermediate value of tonal gradation and the value of A (x, y-1) is less than the intermediate value of tonal gradation, then transfer the exposure status of C (x, y-1) to right exposure by not exposing;
(2) if the optional position C (x of halftoning file C, y) exposure status is full exposure, C (x, y+1) exposure status is not for expose, and C (x+dx, y-dy) exposure status is full exposure, then can judge that C (x, y) is as right edge feature point; Putting before this, checking the relevant value in file to be printed A, if the value of A (x, y) is more than or equal to the intermediate value of tonal gradation, then transferring the exposure status of C (x, y) to left exposure by full exposure; If the value of A (x, y) is less than the intermediate value of tonal gradation and the value of A (x, y+1) is less than the intermediate value of tonal gradation, then transfer the exposure status of C (x, y+1) to left exposure by not exposing.
4. two halftoning methods of laser printer high-quality word output according to claim 3, it is characterized in that: described empirical value dx and dy is as edge feature point Rule of judgment, its obtaining value method is: the adjacent amplitude centre distance on the screen angle direction formed after the median contrast of AM threshold value matrix and tonal gradation is H and W, the unit of H and W is respectively row in AM threshold value matrix and row, in conjunction with actual printout result on the basis of H and W, fine setting H and W obtains empirical value dx and dy.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110153562A (en) * | 2019-04-26 | 2019-08-23 | 深圳市金城保密技术有限公司 | A kind of laser image forming apparatus and laser printing method |
| CN116051490A (en) * | 2022-12-30 | 2023-05-02 | 北京辰光融信技术有限公司 | Document print quality detection method, printing device, electronic device, and storage medium |
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| CN110153562B (en) * | 2019-04-26 | 2021-07-06 | 深圳市金城保密技术有限公司 | Laser imaging device and laser printing method |
| CN116051490A (en) * | 2022-12-30 | 2023-05-02 | 北京辰光融信技术有限公司 | Document print quality detection method, printing device, electronic device, and storage medium |
| CN116051490B (en) * | 2022-12-30 | 2023-06-20 | 北京辰光融信技术有限公司 | Document print quality detection method, printing device, electronic device, and storage medium |
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