CN104469080B - A kind of two halftoning methods of the high-quality word output of laser printer - Google Patents
A kind of two halftoning methods of the high-quality word output of laser printer Download PDFInfo
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- CN104469080B CN104469080B CN201410802121.8A CN201410802121A CN104469080B CN 104469080 B CN104469080 B CN 104469080B CN 201410802121 A CN201410802121 A CN 201410802121A CN 104469080 B CN104469080 B CN 104469080B
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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
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- Multimedia (AREA)
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- Facsimile Image Signal Circuits (AREA)
- Record Information Processing For Printing (AREA)
Abstract
The invention discloses a kind of two halftoning methods of the high-quality word output of laser printer, using the file to be printed of user input as output source file, do and contrast for the first time with amplitude modulation threshold matrix, generation only has the halftoning file of two kinds of exposure status.Edge feature point is first taken before second of contrast, then the gray value of file to be printed relevant position and the intermediate value of tonal gradation do second of contrast, generate the halftoning file of four kinds of exposure status.Exported finally according to halftoning document control half-exposure laser printer.The present invention effectively improves the display effect at the word edge in output, and two halftoning method Adjustment effects are notable.
Description
Technical field
The invention belongs to digital image processing techniques field, and in particular to a kind of high-quality word output of laser printer
Two halftoning methods.
Background technology
Printer is after the order of mimeograph documents is received, by the amplitude modulation threshold matrix built in file and printer to be printed
Carry out a threshold comparison generation halftoning file.In the file for being usually used in printout, most of region of word is real
Step-wise transition is presented in ground, the gray scale in marginal portion.In threshold matrix, the generating mode of value arrangements mode, i.e. site,
For step-wise transition is presented toward surrounding from central point, therefore in halftoning file, the shape of half of site is easily presented in word edge
Shape.By this halftoning file printout output, " waveform " is presented in word edge, see Fig. 1., can be by suitable for this phenomenon
When increase or reduction exposure area so that good transition is realized at word edge, word output quality is improved.It is proposed by the present invention
Two halftoning methods, second of contrast of increase, generates two halftoning files, according to two on the basis of a threshold comparison
The exposure area of position halftoning document control half-exposure laser printer, adjustment word edge effectively improves word output quality.
In the prior art, two general halftoning methods are to reach that difference is dense by controlling the amount out of ink of ink powder
Light degree produces four state of value.Two halftoning algorithms of the present invention, the half-exposure laser printer of use is by control
Exposure position processed, is divided into two parts in left and right, respectively control exposure by an exposure point among a former halftoning, to realize
The change of four values.
The content of the invention
For lifting word edge output quality, the present invention proposes the two and half of the high-quality word output of a kind of laser printer
Tone method.
The technical solution adopted in the present invention is：A kind of two halftoning sides of the high-quality word output of laser printer
Method, it is characterised in that comprise the following steps：
Step 1：According to file to be printed A, first time contrast is carried out with amplitude modulation threshold matrix B first, generation is only complete to expose
Light and the halftoning file C for not exposing two states；
Step 2：Edge feature point is taken to do second of contrast in halftoning file C, edge feature point can be divided into left feature
Marginal point and right edge feature point；
Step 3：After contrasting twice, the halftoning file C of four kinds of exposure status is obtained, two and half are realized according to this
Tone method, is then exported according to this halftoning document control half-exposure laser printer.
Preferably, step 1 to implement flow as follows：
Judge whether the value A (x, y) of file to be printed is less than the corresponding value B (x%16, y%16) of threshold matrix, " % " table
Show that remainder is operated；
When the value A (x, y) of file to be printed is more than or equal to the corresponding value B (x%16, y%16) of threshold matrix, halftoning text
Part correspondence position C (x, y) exposure status are set to not expose；
When the value A (x, y) of file to be printed is less than the corresponding value B (x%16, y%16) of threshold matrix, halftoning file pair
Position C (x, y) exposure status are answered to be set to full exposure.
Preferably, the judgement of edge feature point described in step 2 and second of contrast flow are as follows：
(1) if halftoning file C optional position C (x, y) exposure status are full exposure, C (x, y-1) exposure status
Not expose, and C (x-dx, y+dy) exposure status are full exposure, and dx and dy herein is empirical value, then can determine that C (x, y)
For left edge feature point；Under the premise of herein, the related value checked in file to be printed A, if A (x, y) value is more than or equal to ash
The intermediate value of grade is spent, then C (x, y) exposure status are switched into right exposure by full exposure；If A (x, y) value is less than tonal gradation
Intermediate value and A (x, y-1) value be less than tonal gradation intermediate value, then C (x, y-1) exposure status are switched into the right side by not exposing
Exposure；
(2) if halftoning file C optional position C (x, y) exposure status are full exposure, C (x, y+1) exposure status
Not expose, and C (x+dx, y-dy) exposure status are full exposure, then can determine that C (x, y) is right edge feature point；Before this
Put, the related value checked in file to be printed A, if A (x, y) value be more than or equal to tonal gradation intermediate value, then by C (x,
Y) exposure status switch to left exposure by full exposure；If A (x, y) value is less than the intermediate value of tonal gradation and A (x, y+1) value
Less than the intermediate value of tonal gradation, then C (x, y+1) exposure status are switched into left exposure by not exposing.
Preferably, described empirical value dx and dy is as edge feature point Rule of judgment, its obtaining value method is：AM threshold
Adjacent amplitude centre distance on the screen angle direction formed after the median contrast of value matrix and tonal gradation is H and W,
H and W unit is respectively the row and column in amplitude modulation threshold matrix, and actual printout result is combined on the basis of H and W, micro-
H and W is adjusted to obtain empirical value dx and dy.
Two halftoning methods of the high-quality word output of laser printer proposed by the present invention, with user input wait beat
Printed text part does with amplitude modulation threshold matrix and contrasted for the first time as output source file, and generation only has the halftoning of two kinds of exposure status
File.Edge feature point is first taken before second of contrast, then in the gray value and tonal gradation of file to be printed relevant position
Value does second of contrast, generates the halftoning file of four kinds of exposure status.Finally according to halftoning document control half-exposure laser
Printer is exported.The present invention effectively improves the display effect at the word edge in output, two halftoning method adjustment
Effect is notable.
Brief description of the drawings
Fig. 1：For a halftoning file output character edge effect figure of background of invention.
Fig. 2：For not the exposing of half-exposure laser printer of the embodiment of the present invention, right exposure, left exposure and full exposure pair
The exposure inking part answered.
Fig. 3：For the flow chart of the embodiment of the present invention.
Fig. 4：For the shadow printout result figure before two halftoning methods adjustment of the present invention.
Fig. 5：For the shadow printout result figure after two halftoning methods adjustment of the present invention.
Fig. 6：For the high light printout result figure before two halftoning methods adjustment of the present invention.
Fig. 7：For the high light printout result figure after two halftoning methods adjustment of the present invention.
Fig. 8：For the lena printout result figures before two halftoning methods adjustment of the present invention.
Fig. 9：For the lena printout result figures after two halftoning methods adjustment of the present invention.
Figure 10：For the English printout partial result figure before two halftoning methods adjustment of the present invention.
Figure 11：For the English printout partial result figure after two halftoning methods adjustment of the present invention.
Figure 12：For the Chinese printout partial result figure before two halftoning methods adjustment of the present invention.
Figure 13：For the Chinese printout partial result figure after two halftoning methods adjustment of the present invention.
Figure 14：For second of contrast schematic diagram of the embodiment of the present invention 1.
Figure 15：For second of contrast schematic diagram of the embodiment of the present invention 2.
Figure 16：For second of contrast schematic diagram of the embodiment of the present invention 3.
Figure 17：For second of 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 the accompanying drawings and embodiment is to this hair
It is bright to be described in further detail, it will be appreciated that implementation example described herein is merely to illustrate and explain the present invention, not
For limiting the present invention.
The technical scheme that the present invention is provided carries out two halftoning method adjustment for the file to be printed of user, and user is defeated
The span of the gray value of the file entered is [0,255].According to the file to be printed of user, carry out secondary contrast to generate phase
The two halftoning files answered.In contrasting for the first time, by the value of the optional position of file to be printed and corresponding amplitude modulation threshold value square
Value in battle array is compared, if less than the value in threshold matrix, the exposure status of the corresponding position of halftoning file are set to entirely
Exposure, is otherwise provided as not exposing.During second contrasts, edge feature point, edge feature point minute are first taken in halftoning file
Left edge feature point and right edge feature point.If the value of the left edge feature point position of correspondence is more than or equal to 128 in file to be printed,
The exposure status of the left edge feature point in two halftoning files are then switched into right exposure by full exposure；If in file to be printed
The value of left edge feature point position is corresponded to less than 128 and correspondingly the value of the left consecutive points of left edge feature point position is less than 128,
The exposure status of the left consecutive points of the left edge feature point in two halftoning files are then switched into right exposure by not exposing.If treating
The value of the right edge feature point position of correspondence is more than or equal to 128 in mimeograph documents, then by the right characteristic edge in two halftoning files
The exposure status of edge point switch to left exposure by full exposure；If the value of the right edge feature point position of correspondence is less than in file to be printed
128 and the values of the right consecutive points of the right edge feature point position of correspondence is less than 128, then by the right feature in two halftoning files
The exposure status of the right consecutive points of marginal point switch to left exposure by not exposing.The two halftoning texts generated after secondary contrast
There are four kinds of exposure status in part.Four kinds of exposure status of half-exposure laser printer, see Fig. 2.
See Fig. 3, it is the flow chart of the embodiment of the present invention, comprises the following steps：
Step 1, according to the printing demand of user, user sends file to be printed A print command to printer, to be printed
File A gray value span is [0,255], and it is done with amplitude modulation threshold matrix B and contrasted for the first time, generates halftoning file
C.The specific method for generating halftoning file C is as follows,
When file to be printed A optional position value A (x, y) value be less than corresponding threshold matrix B among B (x%16,
Y%16), " % " represents remainder operation, then the exposure status of the corresponding position C (x, y) of halftoning file C is set into full exposure
Light, is otherwise provided as not exposing；
Step 2, edge feature point is taken to do second of contrast in halftoning file C, edge feature point can be divided into left feature
Marginal point and right edge feature point.The judgement of edge feature point and second of contrast flow are as follows,
(1) when halftoning file C optional position C (x, y) exposure status are full exposure, C (x, y-1) exposure status
Not expose, and C (x-dx, y+dy) exposure status are full exposure, and dx, dy herein are empirical value, similarly hereinafter, then can determine that C
(x, y) is left edge feature point.Under the premise of herein, the related value checked in file to be printed A.If A (x, y) value be more than etc.
In 128, then C (x, y) exposure status are switched into right exposure by full exposure；If A (x, y) value is less than 128 and A (x, y-1)
Value be less than 128, then C (x, y-1) exposure status are switched into right exposure by not exposing；
(2) when halftoning file C optional position C (x, y) exposure status are full exposure, C (x, y+1) exposure status
Not expose, and C (x+dx, y-dy) exposure status are full exposure, then can determine that C (x, y) is right edge feature point.Before this
Put, the related value checked in file to be printed A.If A (x, y) value is more than or equal to 128, then by C (x, y) exposure status
Left exposure is switched to by full exposure；If the value that A (x, y) value is less than 128 and A (x, y+1) is less than 128, then by C's (x, y+1)
Exposure status switch to left exposure by not exposing.
Empirical value dx, dy herein is as edge feature point Rule of judgment, and its obtaining value method is as described below.Amplitude modulation threshold value square
The adjacent amplitude centre distance on screen angle direction that battle array is formed after being contrasted with the intermediate value 128 of tonal gradation is H and W, H
Unit with W is respectively the row and column in amplitude modulation threshold matrix, and actual printout result, fine setting are combined on the basis of H and W
H and W obtains empirical value dx and dy.
After contrasting twice, the halftoning file C of four kinds of exposure status is obtained, two halftoning sides are realized according to this
Method, is then exported according to this halftoning document control half-exposure laser printer.
The test chart of the present invention is shadow image, high-key image, lena images, English image and Chinese image.In this hair
On the premise of bright used amplitude modulation threshold matrix, printout result figure such as Fig. 4-figure before and after two halftoning method adjustment
Shown in 13.From Fig. 4-Figure 13, technical scheme had both ensured the basic reduction of image contrast information, and word is realized again
High-quality output.
In embodiment 1, the present embodiment, according to the am screening matrix of use, empirical value dx values are that 4, dy values are 3,
The idiographic flow of embodiment is：
The value that the value that file to be printed A, certain point A (x, y) value are 145, A (x, y-1) is 160, A (x-dx, y+dy) is
In 10, threshold matrix B, the value that B (x%16, y%16) value is 175, 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 time contrast is carried out with amplitude modulation threshold matrix B first, generation is only complete to expose
Light and the halftoning file C for not exposing two kinds of exposure status, flow are as follows：
Judge file to be printed value A (x, y) whether be less than the corresponding value B (x%16, y%16) of threshold matrix, as a result for
It is that halftoning file correspondence position C (x, y) exposure status are set to full exposure；
Judge whether the value A (x, y-1) of file to be printed is less than the corresponding value B of threshold matrix (x%16, (y-1) %16),
As a result it is no, halftoning file correspondence position C (x, y-1) exposure status are set to not expose；
Judge whether the value A (x-dx, y+dy) of file to be printed is less than the corresponding value B of threshold matrix ((x-dx) %16, (y
+ dy) %16), as a result it is yes, halftoning file correspondence position C (x-dx, y+dy) exposure status are set to full exposure.
Step 2, edge feature point is taken to do second of contrast, edge feature point can be divided into left edge feature point and right characteristic edge
Edge point.The judgement of edge feature point and second contrast flow are as follows, and legend is see Figure 14, and numerical value is file to be printed in figure
The gray value of relevant position in A：
C (x, y) exposure status are full exposure in this halftoning file, and C (x, y-1) exposure status is do not expose, C
The exposure status of (x-dx, y+dy) are full exposure, then judge C (x, y) as left edge feature point.Check correspondence in file to be printed
The A (x, y) of position value 145, its value is more than 128, then C (x, y) exposure status is switched into right exposure by full exposure.
In embodiment 2, the present embodiment, according to the am screening matrix of use, empirical value dx values are that 4, dy values are 3,
The idiographic flow of embodiment is：
The value that the value that file to be printed A, certain point A (x, y) value are 70, A (x, y-1) is 120, A (x-dx, y+dy) is 5,
In threshold matrix B, the value that B (x%16, y%16) value is 82, 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 time contrast is carried out with amplitude modulation threshold matrix B first, generation is only complete to expose
Light and the halftoning file C for not exposing two kinds of exposure status, flow are as follows：
Judge file to be printed value A (x, y) whether be less than the corresponding value B (x%16, y%16) of threshold matrix, as a result for
It is that halftoning file correspondence position C (x, y) exposure status are set to full exposure；
Judge whether the value A (x, y-1) of file to be printed is less than the corresponding value B of threshold matrix (x%16, (y-1) %16),
As a result it is no, halftoning file correspondence position C (x, y-1) exposure status are set to not expose；
Judge whether the value A (x-dx, y+dy) of file to be printed is less than the corresponding value B of threshold matrix ((x-dx) %16, (y
+ dy) %16), as a result it is yes, halftoning file correspondence position C (x-dx, y+dy) exposure status are set to full exposure.
Step 2, edge feature point is taken to do second of contrast, edge feature point can be divided into left edge feature point and right characteristic edge
Edge point.The judgement of edge feature point and second contrast flow are as follows, and legend is see Figure 15, and numerical value is file to be printed in figure
The gray value of relevant position in A：
C (x, y) exposure status are full exposure in this halftoning file, and C (x, y-1) exposure status is do not expose, C
The exposure status of (x-dx, y+dy) are full exposure, then judge C (x, y) as left edge feature point.Check correspondence in file to be printed
The value 120 that the A (x, y) of position value 70 is less than 128 and A (x, y-1) is less than 128, then by C (x, y-1) exposure status by not
Exposure switchs to right exposure.
In embodiment 3, the present embodiment, according to the am screening matrix of use, empirical value dx values are that 4, dy values are 3,
The idiographic flow of embodiment is：
The value that the value that file to be printed A, certain point A (x, y) value are 140, A (x, y+1) is 179, A (x+dx, y-dy) is
In 20, threshold matrix B, the value that B (x%16, y%16) value is 224, 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 time contrast is carried out with amplitude modulation threshold matrix B first, generation is only complete to expose
Light and the halftoning file C for not exposing two kinds of exposure status, flow are as follows：
Judge file to be printed value A (x, y) whether be less than the corresponding value B (x%16, y%16) of threshold matrix, as a result for
It is that halftoning file correspondence position C (x, y) exposure status are set to full exposure；
Judge whether the value A (x, y+1) of file to be printed is less than the corresponding value B of threshold matrix (x%16, (y+1) %16),
As a result it is no, halftoning file correspondence position C (x, y+1) exposure status are set to not expose；
Judge file to be printed value A (x+dx, y-dy) whether be less than the corresponding value B of threshold matrix ((x+dx) %16,
(y-dy) %16), as a result it is yes, halftoning file correspondence position C (x+dx, y-dy) exposure status are set to full exposure.
Step 2, edge feature point is taken to do the contrast of the second wheel, edge feature point can be divided into left edge feature point and right characteristic edge
Edge point.The judgement of edge feature point and second contrast flow are as follows, and legend is see Figure 16, and numerical value is file to be printed in figure
The gray value of relevant position in A：
C (x, y) exposure status are full exposure in this halftoning file, and C (x, y+1) exposure status is do not expose, C (x
+ dx, y-dy) exposure status be full exposure, then judge C (x, y) as right edge feature point.Check correspondence position in file to be printed
The A (x, y) put value 140, its value is more than 128, then C (x, y) exposure status is switched into left exposure by full exposure.
In embodiment 4, the present embodiment, according to the am screening matrix of use, empirical value dx values are that 4, dy values are 3,
The idiographic flow of embodiment is：
The value that the value that file to be printed A, certain point A (x, y) value are 60, A (x, y+1) is 100, A (x+dx, y-dy) is
In 45, threshold matrix B, the value that B (x%16, y%16) value is 62, 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 time contrast is carried out with amplitude modulation threshold matrix B first, generation is only complete to expose
Light and the halftoning file C for not exposing two kinds of exposure status, flow are as follows：
Judge file to be printed value A (x, y) whether be less than the corresponding value B (x%16, y%16) of threshold matrix, as a result for
It is that halftoning file correspondence position C (x, y) exposure status are set to full exposure；
Judge whether the value A (x, y+1) of file to be printed is less than the corresponding value B of threshold matrix (x%16, (y+1) %16),
As a result it is no, halftoning file correspondence position C (x, y+1) exposure status are set to not expose；
Judge file to be printed value A (x+dx, y-dy) whether be less than the corresponding value B of threshold matrix ((x+dx) %16,
(y-dy) %16), as a result it is yes, halftoning file correspondence position C (x+dx, y-dy) exposure status are set to full exposure.
Step 2, edge feature point is taken to do the contrast of the second wheel, edge feature point can be divided into left edge feature point and right characteristic edge
Edge point.The judgement of edge feature point and second contrast flow are as follows, and legend is see Figure 17, and numerical value is file to be printed in figure
The gray value of relevant position in A：
C (x, y) exposure status are full exposure in this halftoning file, and C (x, y+1) exposure status is do not expose, C (x
+ dx, y-dy) exposure status be full exposure, then judge C (x, y) as right edge feature point.Check correspondence position in file to be printed
The value 100 that the A (x, y) put value 60 is less than 128 and A (x, y+1) is less than 128, then by C (x, y+1) exposure status by not exposing
Light switchs to left exposure.
It should be appreciated that the part that this specification is not elaborated belongs to prior art.
It should be appreciated that the above-mentioned description for preferred embodiment is more detailed, therefore it can not be considered to this
The limitation of invention patent protection scope, one of ordinary skill in the art is not departing from power of the present invention under the enlightenment of the present invention
Profit is required under protected ambit, can also be made replacement or be deformed, each fall within protection scope of the present invention, this hair
It is bright scope is claimed to be determined by the appended claims.
Claims (2)
1. a kind of two halftoning methods of the high-quality word output of laser printer, it is characterised in that comprise the following steps：
Step 1：According to file to be printed A, carry out first time contrast with amplitude modulation threshold matrix B first, the only full exposure of generation and
The halftoning file C of two states is not exposed；
Implement flow as follows：
Judge whether the value A (x, y) of file to be printed is less than the corresponding value B (x%16, y%16) of threshold matrix, " % " represents to take
Remaining operation；
When the value A (x, y) of file to be printed is more than or equal to the corresponding value B (x%16, y%16) of threshold matrix, halftoning file pair
Position C (x, y) exposure status are answered to be set to not expose；
When the value A (x, y) of file to be printed is less than the corresponding value B (x%16, y%16) of threshold matrix, halftoning file correspondence position
The exposure status for putting C (x, y) are set to full exposure；
Step 2：Edge feature point is taken to do second of contrast in halftoning file C, edge feature point can be divided into left edge feature
Point and right edge feature point；
The wherein judgement of edge feature point and second of contrast flow is as follows：
(1) if halftoning file C optional position C (x, y) exposure status are full exposure, C (x, y-1) exposure status is not
Exposure, and C (x-dx, y+dy) exposure status are full exposure, dx and dy herein is empirical value, then can determine that C (x, y) is a left side
Edge feature point；Under the premise of herein, the related value checked in file to be printed A, if A (x, y) value is more than or equal to gray scale etc.
The intermediate value of level, then switch to right exposure by C (x, y) exposure status by full exposure；If A (x, y) value is less than in tonal gradation
Be worth and A (x, y-1) value be less than tonal gradation intermediate value, then C (x, y-1) exposure status are switched into right exposure by not exposing
Light；
(2) if halftoning file C optional position C (x, y) exposure status are full exposure, C (x, y+1) exposure status is not
Exposure, and C (x+dx, y-dy) exposure status are full exposure, then can determine that C (x, y) is right edge feature point；In this premise
Under, the related value checked in file to be printed A, if A (x, y) value is more than or equal to the intermediate value of tonal gradation, then by C (x, y)
Exposure status left exposure is switched to by full exposure；If A (x, y) value is less than the intermediate value of tonal gradation and A (x, y+1) value is small
In the intermediate value of tonal gradation, then C (x, y+1) exposure status are switched into left exposure by not exposing；
Step 3：After contrasting twice, the halftoning file C of four kinds of exposure status is obtained, two halftonings are realized according to this
Method, is then exported according to this halftoning document control half-exposure laser printer.
2. two halftoning methods of the high-quality word output of laser printer according to claim 1, it is characterised in that：
Described empirical value dx and dy is as edge feature point Rule of judgment, and its obtaining value method is：Amplitude modulation threshold matrix and tonal gradation
Median contrast after adjacent amplitude centre distance on the screen angle direction that is formed be respectively for H and W, H and W unit
Row and column in amplitude modulation threshold matrix, combines actual printout result on the basis of H and W, and fine setting H and W obtains empirical value
Dx and dy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410802121.8A CN104469080B (en) | 2014-12-22 | 2014-12-22 | A kind of two halftoning methods of the high-quality word output of laser printer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410802121.8A CN104469080B (en) | 2014-12-22 | 2014-12-22 | A kind of two halftoning methods of the high-quality word output of laser printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104469080A CN104469080A (en) | 2015-03-25 |
| CN104469080B true CN104469080B (en) | 2017-07-11 |
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