CN101489020A - Image processing for enhanced print quality around edges - Google Patents
Image processing for enhanced print quality around edges Download PDFInfo
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- CN101489020A CN101489020A CNA2009100029085A CN200910002908A CN101489020A CN 101489020 A CN101489020 A CN 101489020A CN A2009100029085 A CNA2009100029085 A CN A2009100029085A CN 200910002908 A CN200910002908 A CN 200910002908A CN 101489020 A CN101489020 A CN 101489020A
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Abstract
The invention provides an image processing device for determining states of formation of dots in each printing pixel and improving the printing image quality. The image processing device determines to use the dots formation state during a plurality of sizes dots printing the image based on the image data of the iamge. The image processing device comprises an edge detection unit detecting, from among the pixels making up the image data, dot color edge pixels that are pixels of dot color used to print the image and that are situated at an edge in the image, and a dot assignment unit assigns dots of identical size to the dot color edge pixels.
Description
Technical field
The present invention relates to a kind of image processing that improves the print quality of the edge vicinity in the image.
Background technology
As on paper or various printed mediums such as cloth, film, forming the printing equipment that point prints image, known ink-jet printer.Ink-jet printer for example by spray blue-green (C), dark pinkish red (M), yellow (Y), each chromatic ink of black (K) to printed medium, forms ink dot (ink dot) on printed medium, thus image is printed on the printed medium.In ink-jet printer, for example can form as a little bigger (L point), mid point (M point), point (S point) the point of multiple size.
When ink-jet printer printing image, usually, carry out view data according to presentation video, determine the processing (being called as halftone process) (for example with reference to patent documentation 1) of the formation state of the point in each printed pixels.Here, the so-called formation state of determining the point in each printed pixels is a point (or not forming a little) of determining to form which kind of size of which kind of color in each printed pixels.
Patent documentation 1: the spy opens the 2007-118238 communique
When halftone process, ooze out etc. in order to suppress to produce look, the total quantity of ink to the per unit area of printed medium is provided with restriction sometimes.In this case, worry is for example in the printed pixels of the literal in composing images or the marginal portion in the line chart, mixing forms the point of different size or does not form a little in the part of this printed pixels, because of the sawtooth (jagged) or the shortcoming at edge, and causes print quality to reduce.
In addition, this problem is not limited to ink-jet printer printing image, the common issue with when being the formation state of the point in each printed pixels when determining to utilize point to print image.
Summary of the invention
The present invention makes for solving above-mentioned existing issue, and its purpose is to provide a kind of formation state of determining the point in each printed pixels, so that the technology that print quality improves.
For at least a portion that addresses the above problem, the present invention can be used as following mode or application examples realizes.
View data of [application examples 1] a kind of image that constitutes by a plurality of pixels according to expression, the image processing apparatus of the formation state of the point when determining to utilize the point of a plurality of sizes to print described image possesses:
The color pixel of the point of the printing that is used for described image from the pixel that constitutes described view data, detects in rim detection portion, is positioned at the color edges pixel of the point at edge in the promptly described image; With
Put dispenser, when described image prints described some color edges pixel distributed the point of same size.
In this image processing apparatus, owing to test point color edges pixel from the pixel of composing images data, during the image printing color edges pixel is distributed the point of same size, so can suppress the sawtooth or the shortcoming at edge, improve print quality.
[application examples 2] is the image processing apparatus of application examples 1 record,
The point of described same size is the point beyond the interior maximum sized point of the point of described a plurality of sizes.
In this image processing apparatus, can suppress oozing out or chap of marginal portion, further improve print quality.
[application examples 3] is the image processing apparatus of application examples 1 or application examples 2 records,
Described rim detection portion is from the pixel that constitutes described view data, detection is used for the color pixel of point of the printing of described image, and the distance apart from the edge in the promptly described image is the some color edges neighborhood pixels beyond the described some color edges pixel below the setting;
Described some dispenser distributed the point beyond the maximum sized point in the point of described a plurality of sizes to described some color edges neighborhood pixels when described image printing.
In this image processing apparatus, because test point color edges neighborhood pixels from the pixel of composing images data, in image when printing, distributed the point beyond the maximum sized point in the point of a plurality of sizes to a color edges neighborhood pixels, so can suppress oozing out or chap in the marginal portion better, further improve print quality.
[application examples 4] is the image processing apparatus of application examples 3 records,
Described a plurality of above size of 3 kinds that is of a size of;
When the printing of described image, than when the described image printing, big to the size of the point of described some color edges pixel to the size of the point of described some color edges neighborhood pixels.
In this image processing apparatus, can suppress oozing out or chap of marginal portion better, further improve print quality.
[application examples 5] is the image processing apparatus of application examples 3 records,
Described some dispenser comprises by halftone process, to the pixel of described some color edges pixel of the removal in the pixel that constitutes described view data and described some color edges neighborhood pixels, determines the halftone process portion of the formation state of point.
In this image processing apparatus, because the pixel except a color edges pixel and some color edges neighborhood pixels is determined a little formation state by halftone process, so can restriction be set with regard to the total quantity of ink to the per unit area of printed medium beyond the edge neighbouring part, can suppress colorific oozing out, improve print quality.
[application examples 6] is the image processing apparatus of application examples 1 record,
Described image is only by the a kind image that constitute of white with the color of the point of the printing that is used for described image.
In this image processing apparatus, can when a kind of printing image of the color of only using white and the point that is used for the image printing, improve print quality.
[application examples 7] is the image processing apparatus of application examples 1 record,
Described image is only by the a kind image that constitute of black with the color of the point of the printing that is used for described image.
In this image processing apparatus, can when only using a kind of printing image of black and the some color that is used for the image printing, improve print quality.
[application examples 8] is the image processing apparatus of application examples 1 record,
The point of described a plurality of sizes is formed by a plurality of ink spray volumes.
In this image processing apparatus, the print quality the when point that can improve a plurality of sizes that utilization forms by a plurality of ink spray volumes prints.
[application examples 9] is the image processing apparatus of application examples 1 record,
The point of described a plurality of sizes is formed by a plurality of ink ejection number of times.
In this image processing apparatus, the print quality the when point that can improve a plurality of sizes that utilization forms by a plurality of inks ejection number of times prints.
[application examples 10] is the image processing apparatus of application examples 1 record,
Described some color edges pixel detects in described rim detection portion from the pixel according to the described view data of formation of the RGB color space.
In this image processing apparatus, because from according to test point color edges pixel the pixel of the described view data of formation of the RGB color space, during the image printing color edges pixel is distributed the point of same size,, improve print quality so can suppress the sawtooth or the shortcoming at edge.
In addition, but the present invention's accomplished in various ways, for example, the modes such as data-signal that can determine method and device, point data generation method and device, printing data generating method and device, printing process and device with image processing method and device, some formation state, realize computer program, the recording medium that writes down this computer program that these methods or apparatus function use, comprise this computer program, are embodied in the carrier wave realize.
Description of drawings
Fig. 1 is a structure key diagram of schematically representing the print system in the embodiment of the invention.
Fig. 2 is the flow chart of definite handling process of expression point formation state.
Fig. 3 is the key diagram of printing object image one example after the expression conversion of resolution is handled.
Fig. 4 is the structure key diagram of expression output buffer 32.
Fig. 5 is that correspondence is paid close attention to the plain position of picture and the key diagram of output buffer 32 states.
Fig. 6 is that correspondence is paid close attention to the plain position of picture and the key diagram of output buffer 32 states.
Fig. 7 is that correspondence is paid close attention to the plain position of picture and the key diagram of output buffer 32 states.
Fig. 8 is the flow chart of expression apart from the range estimation handling process at edge.
Fig. 9 is a key diagram of paying close attention to the relation of pixel, adjacent pixels, 2 pixel isolation pixels.
Figure 10 is the key diagram of expression according to an example of the definite some formation state of present embodiment.
Symbol description
10 application programs
20 printer drivers
21 conversion of resolution handling parts
22 rim detection portions
23 look conversion process portions
24 halftone process portions
26 dispenser
27 rasterisations (rasterizing) handling part
32 output buffers
40 printing object images
100 personal computers
110C PU
120 memories
130 input/output interface portions
200 printers
210 CPU
220 memories
230 input/output interface portions
240 unit controls circuit
250 head units
260 bracket unit
270 supply units
1000 print systems
Embodiment
Below, according to embodiment, embodiments of the present invention are described in the following order.
A embodiment:
The B variation:
A embodiment:
Fig. 1 is a structure key diagram of schematically representing the print system in the embodiment of the invention.Print system 1000 in the present embodiment possesses as the personal computer 100 of image processing apparatus with by the wired or wireless printer 200 that is connected in personal computer 100.
The program of application program 10 or printer driver 20 etc. has been installed in personal computer 100.Application program 10 or printer driver 20 are carried out by CPU110 under the operating system (not shown) of regulation.
As shown in Figure 1, printer driver 20 comprises: conversion of resolution handling part 21, rim detection portion 22, look conversion process portion 23, halftone process portion 24, some dispenser 26, rasterization process portion 27.Look conversion process portion 23, halftone process portion 24 and some dispenser 26 are equivalent to the some dispenser among the present invention.
Conversion of resolution handling part 21 is carried out and will be converted the conversion of resolution consistent with the printed resolution of printer 200 to from the resolution ratio of the view data of application program 10 outputs and handle.
Rim detection portion 22 judges with regard to each pixel of composing images data, whether be black border pixel, black border neighborhood pixels and neither the black border pixel neither the black border neighborhood pixels one of pixel (hereinafter referred to as " processed pixels usually ").Here, the black border pixel in the so-called present embodiment is a black picture element, is the pixel that is arranged in the black border of image.In addition, to be positioned at the pixel of black border be that the upper and lower, left and right that are adjacent to this pixel, upper right, bottom right, adjacent pixels upper left, at least 1 direction in lower-left are the color pixel beyond the black to what is called.In addition, in the present embodiment, it is 1 that the black border pixel shows as apart from the distance of black border.In addition, so-called black border neighborhood pixels is the pixel of black and is pixel beyond the black border pixel below the setting apart from the distance of black border.In the present embodiment, setting is set at 2.That is, the black border neighborhood pixels is the pixel of the black beyond the pixel of black border, is the pixel that is adjacent to the black border pixel.In the present embodiment, to show as apart from the distance of black border be 2 to the black border neighborhood pixels.
Look conversion process portion 23 with in the pixel of composing images data, usually processed pixels (promptly be not the black border pixel, neither the black border neighborhood pixels pixel) be object, carry out the look conversion process.The printer that the printer 200 that uses in the present embodiment is to use blue-green (C), magenta (M), yellow (Y), each chromatic ink of black (K) to print.Therefore, look conversion process portion 23 will convert the CMYK value with the pixel value that rgb value is represented to each object pixel.
The printer 200 of present embodiment is to form the ink-jet printer that ink dot prints image on printed medium.Printer 200 possesses: by executive program carry out CPU210, stored program or the data/information of the integral body control of printer 200 or various processing memory 220, and be connected in input/output interface (I/F) portion 230 that carries out data or information exchange between the outside personal computer 100, according to indication from CPU210, control unit controls circuit 240, head unit 250, bracket unit 260 and the supply unit 270 of each unit.
If user's indicating image printing on application program 10 is then sent print command from application program 10 to printer driver 20.Be included in the view data (RGB data) of editor on the application program 10 in this print command.
In the printer driver 20 of receiving print command, conversion of resolution handling part 21 becomes consistent with printed resolution with the conversion of resolution of the view data that comprises in the print command.Then, rim detection portion 22 judges whether each pixel of composing images data is one of black border pixel, black border neighborhood pixels and common processed pixels.For being judged to be the pixel of common processed pixels, by determining a little formation state based on the look conversion process of look conversion process portion 23 and based on the halftone process of halftone process portion 24.For being judged to be the pixel of black border pixel and black border neighborhood pixels, determine the formation state of point by a dispenser 26.With the formation state recording of the point determined in output buffer 32.Processing for the formation state of determining point is described in detail in the back.Rasterization process portion 270 generates point data according to the formation state of the point in each printed pixels that is recorded in output buffer 32, simultaneously, by the order that should be sent to printer 200, the ordering point data, the printed data that will contain point data by input/output interface portion 130 exports printer 200 to.
If printer 200 is received printed data from personal computer 100, then carry out printing treatment.At first, CPU210 receives printed data by input/output interface portion 230 from personal computer 100, resolves the content of the various instructions that comprise in the printed data of receiving.CPU210 is according to analysis result, by unit controls circuit 240 control supply units 270.By this control, the paper that supply unit 270 should print (printed medium) is supplied in the printer 200, and paper is positioned at the printing starting position.
Then, CPU210 is by unit controls circuit 240 control bracket unit 260.By this control, bracket unit 260 makes the carriage of boarded head move along main scanning direction.And CPU210 comes control head unit 250 by unit controls circuit 240 and according to printed data.By this control, the head of head unit 250 from moving along main scanning direction sprays ink intermittently according to printed data,, forms a little on paper on paper by the ink droplet land of spraying.And CPU210 controls supply unit 270, and paper is carried along throughput direction, and relatively moves with respect to head.Thus, head can form a little on the position different with the position of the point of previous formation.Like this, before the data of printing usefulness do not have, repeat processing such as a formation or conveying, the image that printing is made of point on paper.Afterwards, if the data of printing usefulness have not had, then printing treatment finishes.
Fig. 2 is the flow chart of definite handling process of expression point formation state.Definite processing of some formation state is the view data after handling according to conversion of resolution, determines the formation state of the point in each printed pixels, and is recorded in the processing of output buffer 32.
In addition, Fig. 3 is the key diagram of printing object image one example after the expression conversion of resolution is handled.Below, the example that carries out printing treatment according to the printing object image shown in Fig. 3 40 is described.Printing object image 40 shown in Fig. 3 comprises line chart A.Line chart A is made of horizontal 6 * vertical 14 black picture elements.The pixel of part all is a white pixel beyond the line chart A of printing object image 40.That is, printing object image 40 is to be the monochrome image that black constitutes by white with as a kind of ink dot look only.In addition, in Fig. 3, * mark is represented concerned pixel described later, and solid arrow is paid close attention to the track that pixel moves.
Fig. 4 is the structure key diagram of expression output buffer 32 (with reference to Fig. 1).Constitute output buffer 32 and can write down some formation state in the printed pixels corresponding with each pixel of printing object image 40.32A shown in Fig. 4 partly is the part corresponding with the line chart A of printing object image 40.In addition, output buffer 32 may not constitute the some formation state that can write down in the printed pixels corresponding with each pixel of the integral body of printing object image 40, when carrying out printing treatment with band (printing object image 40 being divided into the split image of a plurality of belt-like zones) unit, if output buffer 32 constitute can write down with in the corresponding printed pixels of each pixel in some formation state.
In step S102 (Fig. 2), rim detection portion 22 (Fig. 1) reads in by conversion of resolution handling part 21 and carries out view data after conversion of resolution is handled.In step S104, rim detection portion 22 sets the top left pixel in the printing object image 40 as initial concerned pixel.Fig. 5 to Fig. 7 is that correspondence is paid close attention to the plain position of picture and the key diagram of output buffer 32 states.Epimere at Fig. 5 to Fig. 7, the position of the concerned pixel in the relation of the line chart A (with reference to Fig. 3) on expression and the printing object image 40 (with * symbolic representation), at hypomere, the state of the part 32A (with reference to Fig. 4) that expression is corresponding with line chart A in the output buffer 32.The point formation state that mark among the figure " S " expression " forms the S point ".Equally, the some formation state that the mark among the figure " M " expression " forms the M point ", the some formation state that mark " L " expression " forms the L point ".Along with effluxion, from the state of Fig. 5 left end (state a) is passed to the state (state e) of right-hand member, and, pass to the state (state j) of right-hand member from the state (state f) of Fig. 6 left end, and, pass to the state (state n) of right-hand member from the state (state k) of Fig. 7 left end.State when the state a shown in Fig. 5 represents that the top left pixel in the printing object image 40 is set at initial concerned pixel.
In step S106 (Fig. 2), rim detection portion 22 (Fig. 1) judges whether concerned pixel is black picture element.Because the part beyond the line chart A of the printing object image 40 that uses in the present embodiment all is a white, is not black picture element so be judged to be concerned pixel in the state a of Fig. 5.(step S106: not), look conversion process portion 23 (Fig. 1) carried out the look conversion process, and halftone process portion 24 carries out halftone process (step S108) when concerned pixel was not black picture element being judged to be.The result of halftone process, the some formation state of printed pixels that will be corresponding with concerned pixel is defined as the state of " not forming a little ".
Afterwards, in step S122 (Fig. 2), rim detection portion 22 judges whether concerned pixel is the pixel of printing object image 40 right-hand members.(step S122: not), rim detection portion 22 is with concerned pixel 1 amount of pixels (step S124) that moves right when judging that concerned pixel is not the pixel of printing object image 40 right-hand members.Afterwards, step S106 is returned in processing.In the state a of Fig. 5, if determined the some formation state of the printed pixels corresponding with concerned pixel, 1 amount of pixels (step S124) then moves right concerned pixel.Afterwards, in step S106, judge that once more concerned pixel is not a black picture element.Therefore, both just in this state, also carried out the look conversion process of look conversion process portion 23 and the halftone process (step S108) of halftone process portion 24, the some formation state of printed pixels that will be corresponding with concerned pixel is defined as the state of " not forming a little ".Repeat this processing, if concerned pixel among step S122s judges then that from the right-hand member that the state a of Fig. 5 moves to printing object image 40 concerned pixel is a right-hand member.At this moment, rim detection portion 22 judges whether concerned pixel is the pixel (step S126) of the lower end of image.(step S126: not), rim detection portion 22 moves to image left end (step S128) under 1 line with concerned pixel when judging that concerned pixel is not the pixel of lower end of image.Afterwards, step S106 is returned in processing.
Repeat above-mentioned processing,, judge in step S106 that then concerned pixel is a black picture element if concerned pixel moves to the shown position of state b of Fig. 5.At this moment, rim detection portion 22 carries out apart from the range estimation at edge and handles (step S110).Handling apart from the range estimation at edge is to judge whether the distance apart from the black border of concerned pixel is the processing of one of " 1 " " 2 " " greater than 2 ".That is, handling apart from the range estimation at edge is to judge whether concerned pixel is black border pixel, black border neighborhood pixels and the processing of one of processed pixels usually.
Fig. 8 is the flow chart of expression apart from the range estimation handling process at edge.In addition, Fig. 9 is a key diagram of paying close attention to the relation of pixel, adjacent pixels, 2 pixel isolation pixels.As shown in Figure 9, (P1～P8) is called adjacent pixels with 8 pixels being adjacent to the upper and lower, left and right of concerned pixel P0, upper right, bottom right, upper left, lower-left all directions.And, will from concerned pixel P0 up and down left and right sides all directions separate the pixel of 2 pixels (P9～P12) be called 2 pixel isolation pixels.
In step S202 (Fig. 8), rim detection portion 22 (Fig. 1) judges whether the adjacent pixels of concerned pixel (exists white pixel among the P1 of Fig. 9～P8).When having white pixel in the adjacent pixels of judging concerned pixel (step S202: be), establishing apart from the distance of black border is 1 (step S204).This judgement is because concerned pixel is a black picture element, and adjacent pixels is a white pixel.Apart from the distance of black border is 1 to mean that concerned pixel is the black border pixel.
On the other hand, (step S202: not), rim detection portion 22 judges whether the 2 pixel isolation pixels (P9 of Fig. 9) of concerned pixel top are white pixel (step S206) when not having white pixel in being judged to be the adjacent pixels of concerned pixel.When 2 pixel isolation pixels above being judged to be concerned pixel are white pixel (step S206: be), rim detection portion 22 judges whether the adjacent pixels (P2 of Fig. 9) of concerned pixel top is black picture element (step S208).When the adjacent pixels above being judged to be concerned pixel is black picture element (step S208: be), establishing apart from the distance of black border is 2 (step S210).Such judgement is because the adjacent pixels of concerned pixel and top is a black picture element, and 2 pixel isolation pixels of top are white pixel.Apart from the distance of black border is 2 to mean that concerned pixel is the black border neighborhood pixels.When the adjacent pixels above being judged to be concerned pixel is not black picture element (step S208: be), handle entering step S212.
Below, with the judgement carried out among above-mentioned steps S206 and S208 top whether be that the black border neighborhood pixels is identical, whether respectively to left, right-hand, below, carrying out concerned pixel is the judgement of black border neighborhood pixels.Promptly, in step S212 and S214,2 pixel isolation pixels (P10 of Fig. 9) at the left of concerned pixel are white pixel (step S212: be), and when the adjacent pixels of concerned pixel left (P4 of Fig. 9) is black picture element (step S214: be), if the distance apart from the black border is 2 (being that concerned pixel is the black border neighborhood pixels) (steps 210). and, in step S216 and S218, the 2 pixel isolation pixels (P11 of Fig. 9) right-hand at concerned pixel are white pixel (step S216: be), and when right-hand adjacent pixels (P5 of Fig. 9) of concerned pixel is black picture element (step S218: be), also establishing apart from the distance of black border is 2 (being that concerned pixel is the black border neighborhood pixels) (step S210).In addition, in step S220 and S222,2 pixel isolation pixels (P12 of Fig. 9) below concerned pixel are white pixel (step S220: be), and when the adjacent pixels (P7 of Fig. 9) of concerned pixel below is black picture element (step S222: be), also establishing apart from the distance of black border is 2 (being that concerned pixel is the black border neighborhood pixels) (step S210).
With regard to one of top, left, right-hand, below, be judged to be concerned pixel when not being the black border neighborhood pixels, also establish distance apart from the black border greater than 2 (step S224).Distance apart from the black border means that greater than 2 concerned pixel is common processed pixels.
Being judged to be apart from the distance of black border by the range estimation processing (the step S110 of Fig. 2) apart from the edge shown in Fig. 8 is 1 o'clock (step S112: be), and some dispenser 26 (Fig. 1) is distributed S point (step S114) to concerned pixel.During owing to the position shown in the state b that is positioned at Fig. 5 at concerned pixel, being judged to be apart from the distance of black border is 1 (being that concerned pixel is the black border pixel), so some dispenser 26 writes down the formation state of the point of " forming the S point " in the zone corresponding with concerned pixel of output buffer 32.Afterwards, repeat concerned pixel move and based on according to the determining of the some formation state of the method for the result of determination of concerned pixel, the state of output buffer 32 moves as state c, the state d of Fig. 5 illustrates.
When concerned pixel moved to position shown in the state e of Fig. 5, handling judgement in (the step S110 of Fig. 2) in the range estimation at distance edge was 2 (step S116: be) apart from the distance of black border.At this moment, some dispenser 26 (Fig. 1) is distributed the M point to concerned pixel, the formation state (step S118) of the point that record in the zone corresponding with concerned pixel of output buffer 32 " forms the M point ".Afterwards, repeat concerned pixel move and based on according to the determining of the some formation state of the method for the result of determination of concerned pixel, the state of output buffer 32 moves as state f, state g, state h, the state i of Fig. 6 illustrates.
When concerned pixel moves to position shown in the state j of Fig. 6, handle the distance that is judged to be in (the step S110 of Fig. 2) apart from the black border greater than 2 in the range estimation at distance edge.That is, be judged to be apart from the distance of black border neither 1 neither 2 (step S112 and S116: not).At this moment, concerned pixel becomes common processed pixels, carries out the look conversion process of look conversion process 23 and the halftone process (step S120) of halftone process portion 24.In the halftone process result, when concerned pixel is for example distributed the S point, the formation state (with reference to the state j of Fig. 6) of the point that record in the zone corresponding with concerned pixel of output buffer 32 " forms the S point ".Afterwards, repeat concerned pixel move and based on according to the determining of the some formation state of the method for the result of determination of concerned pixel, the state of output buffer 32 moves as state k, state 1, state m, the state n of Fig. 7 illustrates.After the state n, if concerned pixel moves to the bottom righthand side of printing object image 40 (Fig. 3), then being judged to be concerned pixel in the step S126 of Fig. 2 is the image lower end, and processing finishes.
Definite processing of the some formation state by above explanation, the some formation state of printed pixels that will be corresponding with the part of the line chart A of printing object image 40 (with reference to Fig. 3) be specified to shown in the state n of Fig. 7 like that.Under this state, when printer 200 printing images, in the printed pixels corresponding, form the S point with the black border pixel, in the printed pixels corresponding, form the M point with the black border pixel.And, determine by common halftone process greater than the some formation state of the corresponding printed pixels of 2 common processed pixels with the distance of distance black border.
Figure 10 is the key diagram of expression according to definite some formation state one example of present embodiment.In Figure 10 (a), the some formation state the when line chart of the width W 1 that is equivalent to printed pixels 7 amount of pixels is printed in expression, in Figure 10 (b), the some formation state the when line chart of the width W 2 that is equivalent to printed pixels 1 amount of pixels is printed in expression.The point formation state that the mark of Figure 10 " S " expression " forms the S point ".Equally, the some formation state that mark " M " expression " forms the M point ", the some formation state that mark " L " expression " forms the L point ".In the present embodiment, owing to distribute the point (being the S point in the present embodiment) of same size to whole printed pixels corresponding with the black border pixel, so suppressed the sawtooth or the shortcoming at the edge in the printing image, print quality improves.And shown in Figure 10 (b), owing to when the line chart of the thin width of printing, also to the printed pixels distributing point corresponding with whole black border pixels, can't produce shortcoming a little, when the line chart of the thin width of printing, print quality also improves.
And, in the present embodiment, owing to the point (being the S point in the present embodiment) in addition of maximum sized point (L point) in the point of a plurality of sizes that are used in printing to the printed pixels branch corresponding with the black border pixel, so be suppressed at oozing out or chap in the marginal portion, print quality further improves.In addition, in the present embodiment, because also maximum sized point (L point) point (being the M point in the present embodiment) in addition in the printed pixels branch corresponding with the black border neighborhood pixels is used in the point of a plurality of sizes of printing, so suppress oozing out or chap in the marginal portion better, print quality further improves.In addition, in the present embodiment, since to the printed pixels assignment sizes corresponding with the black border neighborhood pixels than being dispensed to the point also big (being the M point in the present embodiment) with the point (being the S point in the present embodiment) of the corresponding printed pixels of black border pixel, so suppress oozing out or chap in the marginal portion better, print quality further improves.
B: variation
In addition, the invention is not restricted to the foregoing description or execution mode, can in breaking away from its aim scope, not implement in every way, for example following variation can be arranged.
B1 variation 1:
In the above-described embodiments, to the printed pixels corresponding with the black border pixel distribute minimum dimension point, be the S point, if but all distribute the point of same size to the printed pixels corresponding with the black border pixel, then also can distribute M point or L point.Because when whole printed pixels corresponding with the black border pixel distributed M point (or L point), suppressed the sawtooth or the shortcoming at the edge in the printing image, and, shortcoming a little do not produced, so print quality improves yet.In addition, if the point (S point or M point) beyond the printed pixels corresponding with the black border pixel distributed maximum sized point, then owing to would suppressing oozing out or chap in the marginal portion, so more preferred.
In addition, in the above-described embodiments, distribute the M point to the printed pixels corresponding with the black border neighborhood pixels, but as long as distribute maximum sized point (L point) point in addition to the printed pixels corresponding with the black border neighborhood pixels, for example, both can distribute the S point, also can distribute the M point, distribute the S point to a remaining part to the part of the printed pixels corresponding with the black border neighborhood pixels to whole printed pixels corresponding with the black border neighborhood pixels.
And in the above-described embodiments, it is black border pixel, black border neighborhood pixels and common processed pixels 3 kinds that each pixel of composing images data is differentiated, and is black border pixel and common processed pixels 2 kinds but also can differentiate.At this moment, also printed pixels that can be just corresponding with common processed pixels is all distributed the S point by the state that forms of look conversion process and the definite point of halftone process to the printed pixels corresponding with the black border pixel.Even like this, owing to suppressed the sawtooth at the edge in the printing image or shortcoming, and do not produce shortcoming a little, and then oozing out or chap in the inhibition marginal portion is so print quality also improves.Perhaps, at this moment, also can all distribute M point (or L point) to the printed pixels corresponding with the black border pixel.Even like this, because the sawtooth at the edge in suppressing the printing image or shortcoming, and do not produce a little shortcoming, so print quality also improves.In addition, it is black border pixel, black border neighborhood pixels and common processed pixels 3 kinds that each pixel of composing images data is differentiated, if distribute maximum sized point (L point) point in addition to the printed pixels corresponding with the black border neighborhood pixels, then owing to suppressing oozing out or chap in the marginal portion well, so more preferred.
B2 variation 2:
In the above-described embodiments, illustrated that the image only to be made of white and black is an object, the definite processing that makes the print quality in the vicinity of black border improve the some formation state of usefulness, but the present invention also applicable to only by white with to be used for the image that a kind (for example blue-green or magenta, yellow) of the some color of image printing constitute be object, the definite processing that makes the edge of this color print quality in contiguous improve the some formation state of usefulness.Promptly, with regard to each pixel of composing images data, detect the edge pixel or the edge neighborhood pixels of this color, the printed pixels corresponding with edge pixel that detects or edge neighborhood pixels is by the point of distribution provisions, but not common halftone process, can be same as the previously described embodiments, print quality is improved.
And the present invention is a white situation in addition applicable to the color of printed medium also.Promptly, the present invention also applicable to only by the color (for example black) of printed medium with to be used for the image that a kind (for example blue-green or magenta, yellow) of the some color of image printing constitute be object, the definite processing that makes the contiguous print quality in edge of this color improve the some formation state of usefulness.
B3 variation 3:
In the above-described embodiments, in the integral body of printing object image 40, carry out a definite processing that forms state with identical method, but also can only the text filed as object of literal or line chart (mark, figure, curve etc.) will be comprised in the printing object image 40, utilize the method for the foregoing description, carry out determining of a formation state.At this moment, for example both can be text filed according to the rgb value detection of view data, can detect text filed according to the brightness value of pixel again.
B4 variation 4:
In the above-described embodiments, view data is the RGB data, but view data may not be the RGB data.And, in the above-described embodiments, printer 200 is by using the ink of CMYK4 kind color, the point that forms 3 kind sizes prints, but both printable machine 200 uses the ink of other colors beyond the CMYK to print, and also can print by the point that forms 2 kinds (or more than 4 kinds) size.
In addition, in the above-described embodiments, the point that printer 200 forms a plurality of sizes can realize ink jet amount difference by the size according to the point that forms.For example,, prepare the waveform of the ink of corresponding with the point of a plurality of sizes respectively ink jet amount of injection, spray ink, the point of formation desired size by using the waveform corresponding with the size of the point that forms as the waveform of the drive signal of controlling ink jet.Perhaps, also can use the nozzle corresponding to spray ink, form the point of desired size thus by the mutually different nozzle of ink jet amount is set on head with the size of the point that forms.And, also can make ink jet number of times difference by size according to the point that forms, realize the formation of the point of a plurality of sizes.And, also ink can be pressurizeed, spray the fluid column of ink continuously, utilize if with this fluid column with heater heats then column separation become the principle of point, change by the timing that makes heating pulse, realize forming the point of a plurality of sizes.
In addition, in the above-described embodiments, look conversion process portion 23 with common processed pixels (neither the black border pixel, pixel that neither the black border neighborhood pixels) for object carries out the look conversion, but but also look conversion process portion 23 carry out the look conversion of the pixel beyond the common processed pixels.For example, but also 23 pairs of whole pixels of look conversion process portion carry out from the RGB data to the conversion of the look of cmyk data.At this moment, but also rim detection portion 22 use cmyk datas to carry out the edge to judge.
And, in the above-described embodiments, will be from the view data of application program 10 output as the RGB data, but the also data of other colorimeter systems such as cmyk data of view data.When view data was the data of other colorimeter systems such as cmyk data, rim detection portion 22 also can use the data of these other colorimeter systems to carry out the edge to judge.
B5 variation 5:
In the above-described embodiments, image processing apparatus is constituted personal computer 100, but the present invention also determines the image processing apparatus of the image processing of some formation state applicable to the carrying out beyond the personal computer 100.For example, also image processing apparatus can be constituted printer 200.
And, in the above-described embodiments, also the part by hard-wired structure can be replaced to software, on the contrary, also the part of the structure that can be realized by software replaces to hardware.
B6 variation 6:
In the above-described embodiments, a printer that moves along main scanning direction with the head of using to printed medium injection ink is that example illustrates, but also applicable to head is a plurality of along the main scanning direction alignment arrangements, the linear head printer that head does not move.
And in the above-described embodiments, head has a plurality of nozzles, but also can have only 1 nozzle by head.
In addition, in the above-described embodiments, personal computer 100 has output buffer 32, and the data record of the formation state of the point that expression is definite is in output buffer 32, but personal computer 100 needn't have output buffer 32.Can adopt with having or not output buffer 32 to have nothing to do, the data of the formation state of the point that expression is definite are not recorded in output buffer 32 and the streamed structure of inflow printer 200 yet.
And, in the above-described embodiments, has illustrated and used the example of paper, but the present invention is also applicable to the printing of the various printed mediums beyond paper or cloth, film, circuit substrate this class paper as printed medium.
And the selecting sequence of the concerned pixel in the foregoing description can at random change.
Claims (11)
1, a kind of image processing apparatus, the view data of the image that constitutes by a plurality of pixels according to expression, the formation state of the point when determining to utilize the point of a plurality of sizes to print described image possesses:
Rim detection portion from the pixel that constitutes described view data, detects the color pixel of the point of the printing that is used for described image, is positioned at the some color edges pixel at edge in the promptly described image; With
Put dispenser, when described image prints, described some color edges pixel distributed the point of same size.
2, image processing apparatus according to claim 1 is characterized in that:
The point of described same size is the point beyond the interior maximum sized point of the point of described a plurality of sizes.
3, image processing apparatus according to claim 1 and 2 is characterized in that:
Described rim detection portion is from the pixel that constitutes described view data, detection is used for the color pixel of point of the printing of described image, is some color edges neighborhood pixels beyond the described some color edges pixel below the setting apart from the distance at edge in the promptly described image;
Described some dispenser distributed the point beyond the maximum sized point in the point of described a plurality of sizes to described some color edges neighborhood pixels when described image printing.
4, image processing apparatus according to claim 3 is characterized in that:
Described a plurality of above size of 3 kinds that is of a size of;
When the printing of described image, than when the printing of described image, big to the size of the point of described some color edges pixel to the size of the point of described some color edges neighborhood pixels.
5, image processing apparatus according to claim 3 is characterized in that:
Described some dispenser comprises by halftone process, to the pixel except described some color edges pixel and described some color edges neighborhood pixels in the pixel that constitutes described view data, determines the halftone process portion of the formation state of point.
6, image processing apparatus according to claim 1 is characterized in that:
Described image is only by the a kind image that constitute of white with the color of the point of the printing that is used for described image.
7, image processing apparatus according to claim 1 is characterized in that:
Described image is only by the a kind image that constitute of black with the color of the point of the printing that is used for described image.
8, image processing apparatus according to claim 1 is characterized in that:
The point of described a plurality of sizes is formed by a plurality of ink spray volumes.
9, image processing apparatus according to claim 1 is characterized in that:
The point of described a plurality of sizes is formed by a plurality of ink ejection number of times.
10, image processing apparatus according to claim 1 is characterized in that:
Described rim detection portion detects described some color edges pixel from the pixel according to the described view data of formation of the RGB color space.
11, a kind of image processing method, the view data of the image that constitutes by a plurality of pixels according to expression, the formation state of the point when determining to utilize the point of a plurality of sizes to print described image possesses:
From the pixel that constitutes described view data, detect the color pixel of the point of the printing that is used for described image, be positioned at the operation of the some color edges pixel at edge in the promptly described image; With
When described image prints, described some color edges pixel distributed the operation of the point of same size.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008005470 | 2008-01-15 | ||
| JP2008005470 | 2008-01-15 | ||
| JP2008268395 | 2008-10-17 |
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| Publication Number | Publication Date |
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| CN101489020A true CN101489020A (en) | 2009-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100029085A Pending CN101489020A (en) | 2008-01-15 | 2009-01-12 | Image processing for enhanced print quality around edges |
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| JP (1) | JP2009194894A (en) |
| CN (1) | CN101489020A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076334A (en) * | 2013-01-25 | 2013-05-01 | 上海理工大学 | Method for quantitatively evaluating perceived quality of digital printed lines and texts |
| CN104660840A (en) * | 2013-11-18 | 2015-05-27 | 佳能株式会社 | Image processing apparatus, and method of controlling the same |
| CN109016866A (en) * | 2017-06-12 | 2018-12-18 | 精工爱普生株式会社 | Image processing apparatus and print system |
| CN112918116A (en) * | 2021-01-27 | 2021-06-08 | 北京印刷学院 | Method for improving printing precision of color printing system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110050525A1 (en) | 2009-08-26 | 2011-03-03 | Fujitsu Ten Limited | Radar device and antenna angle adjusting method |
-
2008
- 2008-10-17 JP JP2008268395A patent/JP2009194894A/en not_active Withdrawn
-
2009
- 2009-01-12 CN CNA2009100029085A patent/CN101489020A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076334A (en) * | 2013-01-25 | 2013-05-01 | 上海理工大学 | Method for quantitatively evaluating perceived quality of digital printed lines and texts |
| CN104660840A (en) * | 2013-11-18 | 2015-05-27 | 佳能株式会社 | Image processing apparatus, and method of controlling the same |
| CN104660840B (en) * | 2013-11-18 | 2018-04-03 | 佳能株式会社 | Image processing apparatus and its control method |
| CN109016866A (en) * | 2017-06-12 | 2018-12-18 | 精工爱普生株式会社 | Image processing apparatus and print system |
| CN112918116A (en) * | 2021-01-27 | 2021-06-08 | 北京印刷学院 | Method for improving printing precision of color printing system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009194894A (en) | 2009-08-27 |
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Application publication date: 20090722 |