CN101489020A - Image processing for enhanced print quality around edges - Google Patents

Image processing for enhanced print quality around edges Download PDF

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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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狩户信宏
林正树
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Seiko Epson Corp
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Abstract

本发明提供一种图像处理装置,可确定各印刷像素中的点的形成状态,以使印刷画质提高。图像处理装置根据表示图像的图像数据,确定利用多个尺寸的点印刷图像时的点的形成状态。图像处理装置具备:边缘检测部,从构成图像数据的像素中,检测出用于图像印刷的点的颜色的像素,即位于图像的边缘的点颜色边缘像素;和点分配部,对点颜色边缘像素分配相同尺寸的点。

Figure 200910002908

The present invention provides an image processing device capable of determining the formation state of dots in each printing pixel so as to improve the printing quality. The image processing device specifies a dot formation state when an image is printed with dots of a plurality of sizes based on image data representing an image. The image processing device is provided with: an edge detection unit, from the pixels constituting the image data, detects pixels of the color of the dots used for image printing, that is, dot color edge pixels located at the edge of the image; Pixels are assigned the same size as points.

Figure 200910002908

Description

可提高边缘邻近印刷画质的图像处理 Image processing to improve print quality near the edges

技术领域 technical field

本发明涉及一种可提高图像中的边缘邻近的印刷画质的图像处理。The present invention relates to image processing capable of improving print quality near edges in an image.

背景技术 Background technique

作为在纸或布、胶片等各种印刷介质上形成点来印刷图像的印刷装置,已知喷墨打印机。喷墨打印机例如通过向印刷介质喷射蓝绿色(C)、深品红(M)、黄色(Y)、黑色(K)各色墨水,在印刷介质上形成墨点(ink dot),由此将图像印刷在印刷介质上。在喷墨打印机中,可形成例如如大点(L点)、中点(M点)、小点(S点)那样,多种尺寸的点。Inkjet printers are known as printing devices for printing images by forming dots on various printing media such as paper, cloth, and film. Inkjet printers, for example, form ink dots on the printing medium by ejecting inks of cyan (C), magenta (M), yellow (Y), and black (K) onto the printing medium, thereby converting the image to the printing medium. Printed on print media. In an inkjet printer, it is possible to form dots of various sizes such as large dots (L dots), medium dots (M dots), and small dots (S dots).

在喷墨打印机印刷图像时,通常,进行根据表示图像的图像数据,确定各印刷像素中的点的形成状态的处理(被称为半色调处理)(例如参照专利文献1)。这里,所谓确定各印刷像素中的点的形成状态,是确定在各印刷像素中形成哪种颜色的哪种尺寸的点(或不形成点)。When an inkjet printer prints an image, processing (referred to as halftone processing) of specifying the formation state of dots in each printing pixel is generally performed based on image data representing the image (see, for example, Patent Document 1). Here, specifying the formation state of dots in each printing pixel means specifying which color and which size of dots are to be formed (or not formed) in each printing pixel.

专利文献1:特开2007-118238号公报Patent Document 1: JP-A-2007-118238

在半色调处理时,为了抑制产生色渗出等,有时对印刷介质的每单位面积的总墨水量设置限制。在这种情况下,担心有可能例如在构成图像中的文字或线图中的边缘部分的印刷像素中,混合形成不同尺寸的点、或在该印刷像素的一部分中未形成点,因边缘的锯齿(jagged)或欠缺,而导致印刷画质降低。In halftone processing, in order to suppress occurrence of color bleeding or the like, a limit may be placed on the total amount of ink per unit area of the printing medium. In this case, there is a concern that, for example, dots of different sizes may be mixedly formed in printed pixels constituting text in an image or an edge portion of a line drawing, or no dots may be formed in a part of the printed pixels, due to the Jagged or missing, resulting in reduced printing quality.

另外,该问题不限于喷墨打印机印刷图像,是在确定利用点来印刷图像时的各印刷像素中的点的形成状态时的共同问题。In addition, this problem is not limited to printing an image by an inkjet printer, but is a common problem when specifying the formation state of dots in each printing pixel when printing an image using dots.

发明内容 Contents of the invention

本发明为解决上述现有问题而作出,其目的在于提供一种可确定各印刷像素中的点的形成状态,以使印刷画质提高的技术。The present invention was made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a technology capable of specifying the formation state of dots in each printing pixel to improve the printing quality.

为了解决上述问题的至少一部分,本发明可作为以下方式或应用例实现。In order to solve at least part of the above problems, the present invention can be implemented as the following forms or application examples.

[应用例1]一种根据表示由多个像素构成的图像的图像数据,确定利用多个尺寸的点印刷所述图像时的点的形成状态的图像处理装置,具备:[Application example 1] An image processing device that specifies, based on image data representing an image composed of a plurality of pixels, a dot formation state when the image is printed with dots of a plurality of sizes, comprising:

边缘检测部,从构成所述图像数据的像素中,检测用于所述图像的印刷的点的颜色的像素,即所述图像中位于边缘的点的颜色边缘像素;和an edge detection section detecting, from among pixels constituting the image data, a pixel of a color of a dot used for printing of the image, that is, a color edge pixel of a dot positioned at an edge in the image; and

点分配部,所述图像印刷时对所述点颜色边缘像素分配相同尺寸的点。The dot allocation unit allocates dots of the same size to the edge pixels of the dot color when the image is printed.

在该图像处理装置中,由于从构成图像数据的像素中检测点颜色边缘像素,图像印刷时对点颜色边缘像素分配相同尺寸的点,所以可抑制边缘的锯齿或欠缺,提高印刷画质。In this image processing device, dot-color edge pixels are detected from pixels constituting image data, and dots of the same size are assigned to dot-color edge pixels during image printing, so that jaggedness or chipping of edges can be suppressed, and printing quality can be improved.

[应用例2]是应用例1记载的图像处理装置,[Application example 2] is the image processing device described in Application example 1,

所述相同尺寸的点是所述多个尺寸的点内的最大尺寸的点以外的点。The dots of the same size are dots other than the dot of the largest size among the dots of the plurality of sizes.

在该图像处理装置中,可抑制边缘部分的渗出或变粗,进一步提高印刷画质。In this image processing device, bleeding or thickening of the edge portion can be suppressed, and the print quality can be further improved.

[应用例3]是应用例1或应用例2记载的图像处理装置,[Application example 3] is the image processing device described in Application example 1 or Application example 2,

所述边缘检测部从构成所述图像数据的像素中,检测用于所述图像的印刷的点的颜色的像素,即所述图像中的距边缘的距离为规定值以下的所述点颜色边缘像素以外的点颜色边缘邻近像素;The edge detection unit detects, from pixels constituting the image data, pixels of a dot color used for printing the image, that is, the dot color edge in the image whose distance from the edge is equal to or less than a predetermined value. Point color edges other than pixels adjacent to pixels;

所述点分配部在所述图像印刷时对所述点颜色边缘邻近像素分配所述多个尺寸的点内的最大尺寸的点以外的点。The dot allocating unit allocates dots other than the largest dot among the dots of the plurality of sizes to the edge adjacent pixels of the dot color when the image is printed.

在该图像处理装置中,由于从构成图像数据的像素中检测点颜色边缘邻近像素,图像印刷时对点颜色边缘邻近像素分配多个尺寸的点内最大尺寸的点以外的点,所以可更好地抑制边缘部分中的渗出或变粗,进一步提高印刷画质。In this image processing device, since dot color edge adjacent pixels are detected from the pixels constituting the image data, dots other than the largest dot among dots of a plurality of sizes are assigned to the dot color edge adjacent pixels during image printing, so better Bleeding or thickening in the edge portion is effectively suppressed, and the printing quality is further improved.

[应用例4]是应用例3记载的图像处理装置,[Application Example 4] is the image processing device described in Application Example 3,

所述多个尺寸为3种类以上的尺寸;The multiple sizes are more than 3 types of sizes;

在所述图像的印刷时,对所述点颜色边缘邻近像素的点的尺寸比在所述图像印刷时,对所述点颜色边缘像素的点的尺寸大。When the image is printed, the dot size of the dot-color edge adjacent pixels is larger than the dot size of the dot-color edge pixels when the image is printed.

在该图像处理装置中,可更好地抑制边缘部分的渗出或变粗,进一步提高印刷画质。In this image processing device, bleeding or thickening of the edge portion can be more suppressed, and the printing quality can be further improved.

[应用例5]是应用例3记载的图像处理装置,[Application Example 5] is the image processing device described in Application Example 3,

所述点分配部包含通过半色调处理,对构成所述图像数据的像素内的去除所述点颜色边缘像素和所述点颜色边缘邻近像素的像素,确定点的形成状态的半色调处理部。The dot allocating unit includes a halftone processing unit for specifying a dot formation state for pixels excluding the dot color edge pixel and the dot color edge adjacent pixel among the pixels constituting the image data by halftone processing.

在该图像处理装置中,由于对除了点颜色边缘像素和点颜色边缘邻近像素以外的像素通过半色调处理来确定点的形成状态,所以可就边缘邻近部分以外对印刷介质的每单位面积的总墨水量设置限制,可抑制产生颜色的渗出,提高印刷画质。In this image processing apparatus, since the dot formation state is determined by halftone processing for pixels other than the dot-color edge pixel and the dot-color edge-adjacent pixel, it is possible to calculate the total amount per unit area of the printing medium except for the edge-adjacent portion. The amount of ink is limited, which can suppress the bleeding of the color and improve the printing quality.

[应用例6]是应用例1记载的图像处理装置,[Application Example 6] is the image processing device described in Application Example 1,

所述图像是仅由白色和用于所述图像的印刷的点的颜色的1种构成的图像。The image is an image composed of only one of white and the color of dots used for printing the image.

在该图像处理装置中,可在只使用白色和用于图像印刷的点的颜色的1种印刷图像时,提高印刷画质。In this image processing device, when an image is printed using only one of white and the color of dots used for image printing, the print quality can be improved.

[应用例7]是应用例1记载的图像处理装置,[Application Example 7] is the image processing device described in Application Example 1,

所述图像是仅由黑色和用于所述图像的印刷的点的颜色的1种构成的图像。The image is an image composed of only one of black and the color of dots used for printing the image.

在该图像处理装置中,可在只使用黑色和用于图像印刷的点颜色的1种印刷图像时,提高印刷画质。In this image processing device, when an image is printed using only one of black and dot colors used for image printing, the print quality can be improved.

[应用例8]是应用例1记载的图像处理装置,[Application example 8] is the image processing device described in Application example 1,

所述多个尺寸的点由多个墨水喷出量形成。The dots of the plurality of sizes are formed by the plurality of ink ejection amounts.

在该图像处理装置中,可提高利用由多个墨水喷出量形成的多个尺寸的点来印刷时的印刷画质。In this image processing device, it is possible to improve the print quality when printing is performed using dots of a plurality of sizes formed by a plurality of ejection amounts of ink.

[应用例9]是应用例1记载的图像处理装置,[Application example 9] is the image processing device described in Application example 1,

所述多个尺寸的点由多个墨水喷出次数形成。The dots of the plurality of sizes are formed by a plurality of ink ejection times.

在该图像处理装置中,可提高利用由多个墨水喷出次数形成的多个尺寸的点来印刷时的印刷画质。In this image processing device, it is possible to improve the printing quality when printing with dots of multiple sizes formed by multiple times of ink ejection.

[应用例10]是应用例1记载的图像处理装置,[Application example 10] is the image processing device described in Application example 1,

所述边缘检测部从根据RGB色空间的构成所述图像数据的像素中,检测所述点颜色边缘像素。The edge detection unit detects the dot color edge pixels from among pixels constituting the image data according to an RGB color space.

在该图像处理装置中,由于从根据RGB色空间的构成所述图像数据的像素中检测点颜色边缘像素,图像印刷时对点颜色边缘像素分配相同尺寸的点,所以可抑制边缘的锯齿或欠缺,提高印刷画质。In this image processing device, since the dot color edge pixels are detected from the pixels constituting the image data based on the RGB color space, dots of the same size are allocated to the dot color edge pixels during image printing, so that jaggedness or lack of edges can be suppressed. , Improve printing quality.

另外,本发明可以各种方式实现,例如,可以以图像处理方法及装置、点形成状态确定方法及装置、点数据生成方法及装置、印刷数据生成方法及装置、印刷方法及装置、实现这些方法或装置功能用的计算机程序、记录该计算机程序的记录介质、包含该计算机程序、体现于载波内的数据信号等方式实现。In addition, the present invention can be realized in various forms, for example, it can be implemented as an image processing method and device, a dot formation state determination method and device, a dot data generation method and device, a print data generation method and device, a printing method and device, these methods or a computer program for device functions, a recording medium recording the computer program, or a data signal embodied in a carrier wave including the computer program.

附图说明 Description of drawings

图1是示意地表示本发明实施例中的印刷系统的结构说明图。FIG. 1 is an explanatory diagram schematically showing the structure of a printing system in an embodiment of the present invention.

图2是表示点形成状态的确定处理流程的流程图。FIG. 2 is a flowchart showing the flow of determination processing of the dot formation state.

图3是表示分辨率转换处理后的印刷对象图像一例的说明图。FIG. 3 is an explanatory view showing an example of an image to be printed after resolution conversion processing.

图4是表示输出缓冲器32的结构说明图。FIG. 4 is an explanatory diagram showing the configuration of the output buffer 32 .

图5是对应表示关注像的素位置和输出缓冲器32状态的说明图。FIG. 5 is an explanatory diagram showing a correspondence between the pixel position of the target image and the state of the output buffer 32 .

图6是对应表示关注像的素位置和输出缓冲器32状态的说明图。FIG. 6 is an explanatory diagram showing the correspondence between the pixel position of the target image and the state of the output buffer 32 .

图7是对应表示关注像的素位置和输出缓冲器32状态的说明图。FIG. 7 is an explanatory diagram showing a correspondence between the pixel position of the target image and the state of the output buffer 32 .

图8是表示距边缘的距离判定处理流程的流程图。FIG. 8 is a flowchart showing the flow of a distance determination process from an edge.

图9是表示关注像素、邻接像素、2像素隔离像素的关系的说明图。FIG. 9 is an explanatory diagram showing the relationship between a pixel of interest, an adjacent pixel, and a pixel separated by two pixels.

图10是表示根据本实施例确定的点形成状态的一例的说明图。FIG. 10 is an explanatory diagram showing an example of the dot formation state determined according to the present embodiment.

符号说明Symbol Description

10      应用程序10 applications

20      打印机驱动器20 Printer driver

21      分辨率转换处理部21 Resolution conversion processing unit

22      边缘检测部22 Edge detection department

23      色转换处理部23 Color conversion processing department

24      半色调处理部24 Halftone Processing Department

26      点分配部26 point distribution department

27      光栅化(rasterizing)处理部27 rasterizing processing unit

32      输出缓冲器32 output buffer

40        印刷对象图像40 Print object image

100       个人计算机100 personal computers

110C      PU110C PU

120       存储器120 memory

130       输入输出接口部130 Input and output interface part

200       打印机200 printers

210       CPU210 CPU

220       存储器220 memory

230       输入输出接口部230 Input and output interface part

240       单元控制电路240 unit control circuit

250       头单元250 head unit

260       托架单元260 bracket units

270       输送单元270 Conveyor unit

1000      印刷系统1000 printing system

具体实施方式 Detailed ways

下面,根据实施例,按以下顺序说明本发明的实施方式。Hereinafter, embodiments of the present invention will be described in the following order based on examples.

A实施例:A embodiment:

B变形例:B modification example:

A实施例:A embodiment:

图1是示意地表示本发明实施例中的印刷系统的结构说明图。本实施例中的印刷系统1000具备作为图像处理装置的个人计算机100、和通过有线或无线连接于个人计算机100的打印机200。FIG. 1 is an explanatory diagram schematically showing the structure of a printing system in an embodiment of the present invention. The printing system 1000 in this embodiment includes a personal computer 100 as an image processing device, and a printer 200 connected to the personal computer 100 by wire or wirelessly.

个人计算机100具备:通过执行程序来进行各种处理或控制的CPU110、存储程序或数据/信息的存储器120、在与连接于外部的外围设备之间进行数据或信息交换的输入输出接口(I/F)部130。存储器120具有后述的点形成状态的确定处理所使用的输出缓冲器32。个人计算机100还可进一步具备键盘或定点设备等输入装置、显示器等显示装置、CD-ROM驱动装置等记录再现装置等。The personal computer 100 includes: a CPU 110 for performing various processes or controls by executing programs, a memory 120 for storing programs or data/information, and an input/output interface (I/O) for exchanging data or information with external peripheral devices. F) Part 130. The memory 120 has an output buffer 32 used in a process of specifying a dot formation state to be described later. The personal computer 100 may further include an input device such as a keyboard or a pointing device, a display device such as a monitor, a recording/reproducing device such as a CD-ROM drive, and the like.

在个人计算机100中安装了应用程序10或打印机驱动器20等的程序。应用程序10或打印机驱动器20在规定的操作系统(未图示)下由CPU110执行。Programs such as the application program 10 and the printer driver 20 are installed in the personal computer 100 . The application program 10 or the printer driver 20 is executed by the CPU 110 under a predetermined operating system (not shown).

应用程序10例如是实现图像编辑功能用的程序。用户可通过应用程序10提供的用户接口,给予印刷由应用程序10编辑的图像的指示。若应用程序10从用户接收印刷指示,则向打印机驱动器20输出构成印刷对象的图像数据。另外,在本实施例中,图像数据输出为RGB数据。The application program 10 is, for example, a program for realizing an image editing function. The user can give an instruction to print the image edited by the application 10 through the user interface provided by the application 10 . When the application 10 receives a print instruction from the user, it outputs image data constituting a print target to the printer driver 20 . In addition, in this embodiment, image data is output as RGB data.

打印机驱动器20是用于实现根据从应用程序10输出的图像数据生成印刷数据的功能的程序。将打印机驱动器20存储于CD-ROM等各种存储介质(计算机可读取的记录介质等)来分配,或通过因特网等各种通信部件来配送。The printer driver 20 is a program for realizing a function of generating print data from image data output from the application program 10 . The printer driver 20 is distributed by being stored in various storage media (such as a computer-readable recording medium) such as a CD-ROM, or distributed via various communication means such as the Internet.

打印机驱动器20从应用程序10接收图像数据,根据图像数据生成印刷数据,将生成的印刷数据输出至打印机200。这里,印刷数据是打印机200可解释形式的数据,包含各种指令数据和点数据。指令数据是指示打印机200执行特定动作用的数据。点数据是表示构成印刷的图像(印刷图像)的像素(印刷像素)中的点的形成状态的数据,具体地,是表示在各印刷像素中形成哪种颜色的哪种尺寸的点(或不形成点)的数据。这里,所谓「点」指从打印机200喷射的墨水着落于印刷介质后形成的1个区域。The printer driver 20 receives image data from the application program 10 , generates print data based on the image data, and outputs the generated print data to the printer 200 . Here, the print data is data in a format interpretable by the printer 200 and includes various command data and dot data. The command data is data for instructing the printer 200 to execute a specific operation. The dot data is data indicating the formation state of dots in pixels (printing pixels) constituting a printed image (printing image), specifically, indicating which color and size of dots (or not) are formed in each printing pixel. form point) data. Here, a "dot" refers to an area formed after ink ejected from the printer 200 lands on a printing medium.

如图1所示,打印机驱动器20包含:分辨率转换处理部21、边缘检测部22、色转换处理部23、半色调处理部24、点分配部26、光栅化处理部27。色转换处理部23、半色调处理部24和点分配部26相当于本发明中的点分配部。As shown in FIG. 1 , the printer driver 20 includes a resolution conversion processing unit 21 , an edge detection unit 22 , a color conversion processing unit 23 , a halftone processing unit 24 , a dot allocation unit 26 , and a rasterization processing unit 27 . The color conversion processing unit 23 , the halftone processing unit 24 , and the dot allocating unit 26 correspond to the dot allocating unit in the present invention.

分辨率转换处理部21执行将从应用程序10输出的图像数据的分解率转换成与打印机200的印刷分辨率一致的分辨率转换处理。The resolution conversion processing unit 21 performs resolution conversion processing for converting the resolution ratio of the image data output from the application program 10 to match the printing resolution of the printer 200 .

边缘检测部22判定就构成图像数据的各像素而言,是否是黑色边缘像素、黑色边缘邻近像素和既不是黑色边缘像素也不是黑色边缘邻近像素的像素(以下称为「通常处理像素」)之一。这里,所谓本实施例中的黑色边缘像素是黑色像素,是位于图像中的黑色边缘的像素。另外,所谓位于黑色边缘的像素是邻接于该像素的上、下、左、右、右上、右下、左上、左下至少1个方向的邻接像素为黑色以外的颜色的像素。另外,在本实施例中,黑色边缘像素表现为距黑色边缘的距离为1。另外,所谓黑色边缘邻近像素是黑色的像素且距黑色边缘的距离为规定值以下的黑色边缘像素以外的像素。在本实施例中,规定值设定为2。即,黑色边缘邻近像素是黑色边缘像素以外的黑色的像素,是邻接于黑色边缘像素的像素。在本实施例中,黑色边缘邻近像素表现为距黑色边缘的距离为2。The edge detection unit 22 determines whether or not each pixel constituting the image data is a black edge pixel, a black edge adjacent pixel, or a pixel that is neither a black edge pixel nor a black edge adjacent pixel (hereinafter referred to as a "normally processed pixel"). one. Here, the so-called black edge pixels in this embodiment are black pixels, which are pixels located at the black edge in the image. In addition, a pixel on a black edge is a pixel in which adjacent pixels adjacent to the pixel in at least one direction of up, down, left, right, upper right, lower right, upper left, and lower left are of a color other than black. In addition, in this embodiment, the black edge pixels are represented as having a distance of 1 from the black edge. In addition, the so-called black edge adjacent pixels are black pixels other than black edge pixels whose distance from the black edge is equal to or less than a predetermined value. In this embodiment, the predetermined value is set to 2. That is, the black edge adjacent pixels are black pixels other than the black edge pixels, and are pixels adjacent to the black edge pixels. In this embodiment, pixels adjacent to the black edge appear to have a distance of 2 from the black edge.

色转换处理部23以构成图像数据的像素内的、通常处理像素(即不是黑色边缘像素、也不是黑色边缘邻近像素的像素)为对象,进行色转换处理。本实施例中使用的打印机200是使用蓝绿色(C)、品红色(M)、黄色(Y)、黑色(K)各色墨水进行印刷的打印机。因此,色转换处理部23对每个对象像素,将以RGB值表示的像素值转换成CMYK值。The color conversion processing unit 23 performs color conversion processing on a normal processing pixel (that is, a pixel that is not a black edge pixel or a black edge adjacent pixel) among the pixels constituting the image data. The printer 200 used in this embodiment is a printer that performs printing using inks of cyan (C), magenta (M), yellow (Y), and black (K). Therefore, the color conversion processing unit 23 converts the pixel value represented by the RGB value into the CMYK value for each target pixel.

半色调处理部24根据基于色转换处理部23的色转换处理后的像素值进行半色调处理,确定对应于通常处理像素的印刷像素中的点的形成状态,记录于输出缓冲器32。在本实施例中,半色调处理部24对印刷介质的每单位面积的总墨水量设置限制的同时,通过基于抖动显示阵的阈值处理进行半色调处理。另外,本实施例中使用的打印机200是可形成小尺寸的小点(以下也称为「S点」)、中程度尺寸的中点(以下也称为「M点」)和大尺寸的大点(以下也称为「L点」)的3种类尺寸的点的打印机。因此,作为印刷像素中的点的形成状态,就各墨水颜色而言,存在不形成点,形成S点、形成M点、形成L点的共计4种选择分支。The halftone processing unit 24 performs halftone processing based on the pixel value after the color conversion processing by the color conversion processing unit 23 , specifies the dot formation state in the printing pixel corresponding to the normal processing pixel, and records it in the output buffer 32 . In the present embodiment, the halftone processing section 24 performs halftone processing by dither matrix threshold value processing while setting a limit on the total amount of ink per unit area of the printing medium. In addition, the printer 200 used in this embodiment is capable of forming small-sized small dots (hereinafter also referred to as "S dots"), medium-sized mid-sized dots (hereinafter also referred to as "M dots"), and large-sized large dots. A dot printer for 3 types of dot sizes (hereinafter also referred to as "L dots"). Therefore, as the formation state of the dots in the printing pixels, for each ink color, there are a total of four selection branches: no dots are formed, S dots are formed, M dots are formed, and L dots are formed.

点分配部26通过向构成图像数据的像素内的、与黑色边缘像素及黑色边缘邻近像素对应的印刷像素分配规定的点,确定与黑色边缘像素及黑色边缘邻近像素对应的印刷像素中的点的形成状态,记录于输出缓冲器32。基于点分配部26的点的分配方法在后面详述。The dot allocating unit 26 allocates predetermined dots to printing pixels corresponding to black edge pixels and black edge adjacent pixels among pixels constituting the image data, thereby specifying dots among printing pixels corresponding to black edge pixels and black edge adjacent pixels. The resulting state is recorded in the output buffer 32 . The method of allocating points by the point allocating unit 26 will be described in detail later.

光栅化处理部27根据记录于输出缓冲器32的各印刷像素中的点的形成状态生成点数据,并且,按应传送到打印机200的顺序,对点数据进行排序。The rasterization processing unit 27 generates dot data based on the formation state of dots recorded in each printing pixel in the output buffer 32 , and sorts the dot data in the order to be transmitted to the printer 200 .

本实施例的打印机200是在印刷介质上形成墨点来印刷图像的喷墨打印机。打印机200具备:通过执行程序来执行打印机200的整体控制或各种处理的CPU210、存储程序或数据/信息的存储器220、在与连接于外部的个人计算机100之间进行数据或信息交换的输入输出接口(I/F)部230、根据来自CPU210的指示,控制各单元的单元控制电路240、头单元250、托架单元260、和输送单元270。The printer 200 of this embodiment is an inkjet printer that forms ink dots on a printing medium to print an image. The printer 200 includes: a CPU 210 that executes overall control of the printer 200 or various processes by executing programs, a memory 220 that stores programs or data/information, and an input/output for exchanging data or information with an externally connected personal computer 100 The interface (I/F) part 230 controls the unit control circuit 240 of each unit, the head unit 250, the carriage unit 260, and the conveyance unit 270 according to the instruction|indication from CPU210.

头单元250具有向印刷介质喷射墨水用的头(未图示)。头具有多个喷嘴,从各喷嘴断续地喷射墨水。将该头搭载于托架(未图示),若托架沿规定的扫描方向(主扫描方向)移动,则头也沿主扫描方向移动。通过头在沿主扫描方向移动的期间断续地喷射墨水,在印刷介质上形成沿主扫描方向的点线(光栅线)。The head unit 250 has a head (not shown) for ejecting ink onto the printing medium. The head has a plurality of nozzles, and ink is ejected intermittently from each nozzle. The head is mounted on a carriage (not shown), and when the carriage moves in a predetermined scanning direction (main scanning direction), the head also moves in the main scanning direction. By intermittently ejecting ink while the head is moving in the main scanning direction, dot lines (raster lines) in the main scanning direction are formed on the printing medium.

托架单元260是使搭载头的托架沿主扫描方向往复移动用的驱动装置。在托架上,除头外,还可装卸地保持收容墨水的墨盒。The carriage unit 260 is a driving device for reciprocating the carriage of the mounting head in the main scanning direction. In addition to the head, an ink cartridge for storing ink is detachably held on the carriage.

输送单元270是将印刷介质送入可印刷的位置,通过印刷时沿规定的输送方向以规定的输送量输送印刷介质,来进行副扫描用的驱动装置。输送单元270例如由给纸辊、输送马达、输送辊、滚筒和排纸辊(未图示)等构成。The transport unit 270 is a driving device for performing sub-scanning by transporting the printing medium to a printable position and transporting the printing medium by a predetermined transport amount in a predetermined transport direction during printing. The transport unit 270 is composed of, for example, a paper feed roller, a transport motor, transport rollers, drums, and paper discharge rollers (not shown).

若用户在应用程序10上指示图像印刷,则从应用程序10向打印机驱动器20发出印刷命令。该印刷命令中包含在应用程序10上编辑的图像数据(RGB数据)。When the user instructs image printing on the application 10 , a print command is issued from the application 10 to the printer driver 20 . Image data (RGB data) edited on the application program 10 is included in this print order.

在收到印刷命令的打印机驱动器20中,分辨率转换处理部21将印刷命令中包含的图像数据的分辨率转换成与印刷分辨率一致。接着,边缘检测部22判定构成图像数据的各像素是否是黑色边缘像素、黑色边缘邻近像素和通常处理像素之一。对判定为通常处理像素的像素而言,通过基于色转换处理部23的色转换处理及基于半色调处理部24的半色调处理来确定点的形成状态。对判定为黑色边缘像素及黑色边缘邻近像素的像素而言,通过点分配部26确定点的形成状态。将确定的点的形成状态记录于输出缓冲器32。对于确定点的形成状态的处理在后面详述。光栅化处理部270根据记录于输出缓冲器32的各印刷像素中的点的形成状态生成点数据,同时,按应传送到打印机200的顺序,排序点数据,通过输入输出接口部130将含有点数据的印刷数据输出至打印机200。In the printer driver 20 that has received the print command, the resolution conversion processing unit 21 converts the resolution of the image data included in the print command to match the print resolution. Next, the edge detection unit 22 determines whether or not each pixel constituting the image data is one of black edge pixels, black edge adjacent pixels, and normal processing pixels. For a pixel determined to be a normal processing pixel, the dot formation state is specified by the color conversion processing by the color conversion processing unit 23 and the halftone processing by the halftone processing unit 24 . For pixels determined to be black edge pixels and black edge adjacent pixels, the dot formation state is determined by the dot allocating unit 26 . The determined dot formation state is recorded in the output buffer 32 . The processing for specifying the formation state of dots will be described in detail later. The rasterization processing unit 270 generates dot data based on the formation state of dots recorded in each printing pixel in the output buffer 32, and at the same time, sorts the dot data in the order to be transmitted to the printer 200, and transfers the dot data containing dots through the input/output interface unit 130. The print data of the data is output to the printer 200 .

若打印机200从个人计算机100收到印刷数据,则执行印刷处理。首先,CPU210通过输入输出接口部230从个人计算机100收到印刷数据,解析收到的印刷数据中包含的各种指令的内容。CPU210根据解析结果,通过单元控制电路240控制输送单元270。通过该控制,输送单元270将应印刷的纸(印刷介质)供给至打印机200内,将纸定位在印刷开始位置。When the printer 200 receives print data from the personal computer 100, it executes print processing. First, CPU 210 receives print data from personal computer 100 via input/output interface unit 230 , and analyzes the contents of various commands included in the received print data. CPU 210 controls transport unit 270 through unit control circuit 240 based on the analysis result. Through this control, the transport unit 270 supplies the paper (print medium) to be printed into the printer 200 and positions the paper at the printing start position.

接着,CPU210通过单元控制电路240控制托架单元260。通过该控制,托架单元260使搭载头的托架沿主扫描方向移动。并且,CPU210通过单元控制电路240、并根据印刷数据来控制头单元250。通过该控制,头单元250从沿主扫描方向移动的头,根据印刷数据断续地喷射墨水,通过喷射的墨水滴着落于纸上,在纸上形成点。并且,CPU210控制输送单元270,使纸沿输送方向输送,并相对于头相对地移动。由此,头可在与先前形成的点的位置不同的位置上形成点。这样,印刷用的数据没有之前,重复点形成或输送等处理,在纸上印刷由点构成的图像。之后,如果印刷用的数据没有了,则印刷处理结束。Next, CPU 210 controls cradle unit 260 through unit control circuit 240 . Through this control, the carriage unit 260 moves the carriage of the mounting head in the main scanning direction. Further, CPU 210 controls head unit 250 through unit control circuit 240 based on print data. Through this control, the head unit 250 intermittently ejects ink from the head moving in the main scanning direction according to the print data, and the ejected ink drops land on the paper to form dots on the paper. Further, the CPU 210 controls the conveyance unit 270 to convey the paper in the conveyance direction and move it relative to the head. Thus, the head can form dots at positions different from those previously formed. In this way, before data for printing is available, processes such as dot formation and transport are repeated, and an image composed of dots is printed on paper. After that, if the data for printing is gone, the printing process ends.

图2是表示点形成状态的确定处理流程的流程图。点形成状态的确定处理是根据分辨率转换处理后的图像数据,确定各印刷像素中的点的形成状态,并记录于输出缓冲器32的处理。FIG. 2 is a flowchart showing the flow of determination processing of the dot formation state. The dot formation state specifying process is a process of specifying the dot formation state in each printing pixel based on the image data after the resolution conversion process, and recording it in the output buffer 32 .

另外,图3是表示分辨率转换处理后的印刷对象图像一例的说明图。下面,说明根据图3示出的印刷对象图像40进行印刷处理的实例。图3示出的印刷对象图像40包含线图A。线图A由横向6×纵向14个黑色像素构成。印刷对象图像40的线图A以外部分的像素全部是白色像素。即,印刷对象图像40是仅由白色和作为墨点色1种即黑色构成的单色图像。另外,在图3中,×标记表示后述的关注像素,实线箭头表示关注像素移动的轨迹。In addition, FIG. 3 is an explanatory diagram showing an example of an image to be printed after resolution conversion processing. Next, an example of printing processing based on the print target image 40 shown in FIG. 3 will be described. The print target image 40 shown in FIG. 3 includes the line drawing A. As shown in FIG. Line image A is composed of 6 horizontal x 14 vertical black pixels. All the pixels in the portion of the image to be printed 40 other than the line drawing A are white pixels. That is, the print target image 40 is a monochrome image composed of only white and black which is one dot color. In addition, in FIG. 3 , x marks indicate a pixel of interest described later, and solid arrows indicate the trajectory of movement of the pixel of interest.

图4是表示输出缓冲器32(参照图1)的结构说明图。构成为输出缓冲器32可记录与印刷对象图像40的各像素对应的印刷像素中的点形成状态。图4示出的32A部分是与印刷对象图像40的线图A对应的部分。另外,输出缓冲器32未必构成为可记录与印刷对象图像40的整体的各像素对应的印刷像素中的点形成状态,在以带(将印刷对象图像40分割成多个带状区域的分割图像)单位执行印刷处理时,输出缓冲器32构成为只要可记录与带内的各像素对应的印刷像素中的点形成状态即可。FIG. 4 is an explanatory diagram showing the configuration of the output buffer 32 (see FIG. 1 ). The output buffer 32 is configured to be able to record the dot formation state in printing pixels corresponding to each pixel of the printing target image 40 . A portion 32A shown in FIG. 4 is a portion corresponding to the line drawing A of the print target image 40 . In addition, the output buffer 32 is not necessarily configured to be able to record the dot formation state in the printing pixels corresponding to the pixels of the entire printing target image 40. ) unit, the output buffer 32 may be configured as long as it can record the dot formation state in the printing pixels corresponding to each pixel in the band.

在步骤S102(图2)中,边缘检测部22(图1)读入由分辨率转换处理部21进行分辨率转换处理后的图像数据。在步骤S104中,边缘检测部22将印刷对象图像40中的左上像素设定作为最初的关注像素。图5至图7是对应表示关注像的素位置和输出缓冲器32状态的说明图。在图5至图7的上段,表示与印刷对象图像40上的线图A(参照图3)的关系中的关注像素的位置(以×符号表示),在下段,表示与输出缓冲器32中的线图A对应的部分32A(参照图4)的状态。图中的记号「S」表示「形成S点」的点形成状态。同样,图中的记号「M」表示「形成M点」的点形成状态,记号「L」表示「形成L点」的点形成状态。随着时间经过,从图5左端的状态(状态a)向右端的状态(状态e)推移,并且,从图6左端的状态(状态f)向右端的状态(状态j)推移,并且,从图7左端的状态(状态k)向右端的状态(状态n)推移。图5示出的状态a表示将印刷对象图像40中的左上像素设定为最初的关注像素时的状态。In step S102 ( FIG. 2 ), the edge detection unit 22 ( FIG. 1 ) reads the image data subjected to resolution conversion processing by the resolution conversion processing unit 21 . In step S104 , the edge detection unit 22 sets the upper left pixel in the print target image 40 as the first pixel of interest. FIG. 5 to FIG. 7 are explanatory diagrams showing correspondence between the pixel position of the image of interest and the state of the output buffer 32 . 5 to 7 show the position of the pixel of interest (indicated by an X) in relation to the line drawing A (see FIG. 3 ) on the print target image 40, and the positions in the output buffer 32 are shown in the lower section. The state of the portion 32A (refer to FIG. 4 ) corresponding to the line diagram A. The symbol "S" in the figure indicates the dot formation state of "S dot formation". Similarly, the symbol "M" in the figure represents the dot formation state of "M dots are formed", and the symbol "L" represents the dot formation state of "L dots are formed". As time passes, the state (state a) at the left end of FIG. The state (state k) at the left end of FIG. 7 transitions to the state (state n) at the right end. State a shown in FIG. 5 represents a state when the upper left pixel in the print target image 40 is set as the first pixel of interest.

在步骤S106(图2)中,边缘检测部22(图1)判定关注像素是否是黑色像素。由于本实施例中使用的印刷对象图像40的线图A以外的部分全部是白色,所以在图5的状态a中判定为关注像素不是黑色像素。在判定为关注像素不是黑色像素时(步骤S106:否),色转换处理部23(图1)进行色转换处理,并且,半色调处理部24进行半色调处理(步骤S108)。半色调处理的结果,将与关注像素对应的印刷像素的点形成状态确定为「不形成点」的状态。In step S106 ( FIG. 2 ), the edge detection unit 22 ( FIG. 1 ) determines whether or not the pixel of interest is a black pixel. Since all parts of the print target image 40 used in this embodiment other than the line drawing A are white, it is determined that the pixel of interest is not a black pixel in state a of FIG. 5 . When it is determined that the pixel of interest is not a black pixel (step S106: No), the color conversion processing unit 23 ( FIG. 1 ) performs color conversion processing, and the halftone processing unit 24 performs halftone processing (step S108 ). As a result of the halftone processing, the dot formation state of the printing pixel corresponding to the pixel of interest is determined as the state of "no dot formation".

之后,在步骤S122(图2)中,边缘检测部22判定关注像素是否是印刷对象图像40右端的像素。在判定关注像素不是印刷对象图像40右端的像素时(步骤S122:否),边缘检测部22将关注像素向右移动1像素量(步骤S124)。之后,处理返回步骤S106。在图5的状态a中,若确定了与关注像素对应的印刷像素的点形成状态,则将关注像素向右移动1像素量(步骤S124)。之后,在步骤S106中,再次判定关注像素不是黑色像素。因此,既便在该状态中,也执行色转换处理部23的色转换处理及半色调处理部24的半色调处理(步骤S108),将与关注像素对应的印刷像素的点形成状态确定为「不形成点」的状态。重复该处理,若关注像素从图5的状态a移动至印刷对象图像40的右端,则在步骤S122中判定关注像素为右端。这时,边缘检测部22判定关注像素是否是图像的下端的像素(步骤S126)。在判定关注像素不是图像的下端的像素时(步骤S126:否),边缘检测部22将关注像素移动至1线下的图像左端(步骤S128)。之后,处理返回步骤S106。Thereafter, in step S122 ( FIG. 2 ), the edge detection unit 22 determines whether or not the pixel of interest is a pixel at the right end of the print target image 40 . When it is determined that the pixel of interest is not the pixel at the right end of the print target image 40 (step S122: No), the edge detection unit 22 shifts the pixel of interest by one pixel to the right (step S124). Thereafter, the process returns to step S106. In state a of FIG. 5 , when the dot formation state of the printing pixel corresponding to the pixel of interest is specified, the pixel of interest is shifted to the right by 1 pixel (step S124 ). After that, in step S106, it is determined again that the pixel of interest is not a black pixel. Therefore, even in this state, the color conversion processing by the color conversion processing section 23 and the halftone processing by the halftone processing section 24 are executed (step S108), and the dot formation state of the printing pixel corresponding to the pixel of interest is determined as " Do not form a point" state. This process is repeated, and when the pixel of interest moves to the right end of the print target image 40 from state a in FIG. 5 , it is determined in step S122 that the pixel of interest is the right end. At this time, the edge detection unit 22 determines whether or not the pixel of interest is a pixel at the lower end of the image (step S126 ). When it is determined that the pixel of interest is not a pixel at the lower end of the image (step S126: No), the edge detection unit 22 moves the pixel of interest to the left end of the image one line below (step S128). Thereafter, the process returns to step S106.

重复上述处理,若关注像素移动至图5的状态b所示出的位置,则在步骤S106中判定关注像素为黑色像素。这时,边缘检测部22执行距边缘的距离判定处理(步骤S110)。距边缘的距离判定处理是判定关注像素的距黑色边缘的距离是否是「1」「2」「大于2」之一的处理。即,距边缘的距离判定处理是判定关注像素是否是黑色边缘像素、黑色边缘邻近像素和通常处理像素之一的处理。The above process is repeated, and when the pixel of interest moves to the position shown in state b in FIG. 5 , it is determined in step S106 that the pixel of interest is a black pixel. At this time, the edge detection unit 22 executes a distance determination process from the edge (step S110 ). The distance determination process from the edge is a process of determining whether the distance of the pixel of interest from the black edge is one of "1", "2" and "greater than 2". That is, the distance determination process from the edge is a process of determining whether the pixel of interest is one of a black edge pixel, a black edge adjacent pixel, and a normal processing pixel.

图8是表示距边缘的距离判定处理流程的流程图。另外,图9是表示关注像素、邻接像素、2像素隔离像素的关系的说明图。如图9所示,将邻接于关注像素P0的上、下、左、右、右上、右下、左上、左下各方向的8个像素(P1~P8)称为邻接像素。并且,将从关注像素P0向上下左右各方向分离2像素的像素(P9~P12)称为2像素隔离像素。FIG. 8 is a flowchart showing the flow of a distance determination process from an edge. In addition, FIG. 9 is an explanatory diagram showing the relationship between a pixel of interest, an adjacent pixel, and a pixel separated by two pixels. As shown in FIG. 9 , eight pixels (P1 to P8) adjacent to the pixel of interest P0 in each of the upper, lower, left, right, upper right, lower right, upper left, and lower left directions (P1 to P8) are referred to as adjacent pixels. In addition, the pixels ( P9 to P12 ) separated by 2 pixels from the pixel of interest P0 in each direction up, down, left, and right are referred to as 2-pixel separation pixels.

在步骤S202(图8)中,边缘检测部22(图1)判定关注像素的邻接像素(图9的P1~P8)中是否存在白色像素。在判定关注像素的邻接像素中存在白色像素时(步骤S202:是),设距黑色边缘的距离为1(步骤S204)。该判定是因为关注像素是黑色像素,且邻接像素是白色像素。距黑色边缘的距离为1意味着关注像素是黑色边缘像素。In step S202 ( FIG. 8 ), the edge detection unit 22 ( FIG. 1 ) determines whether or not there is a white pixel among pixels adjacent to the pixel of interest ( P1 to P8 in FIG. 9 ). When it is determined that there is a white pixel among the pixels adjacent to the pixel of interest (step S202: Yes), the distance from the black edge is set to 1 (step S204). This determination is because the pixel of interest is a black pixel and the adjacent pixel is a white pixel. A distance of 1 from the black edge means that the pixel of interest is a black edge pixel.

另一方面,在判定为关注像素的邻接像素中没有白色像素时(步骤S202:否),边缘检测部22判定关注像素上方的2像素隔离像素(图9的P9)是否是白色像素(步骤S206)。在判定为关注像素上方的2像素隔离像素为白色像素时(步骤S206:是),边缘检测部22判定关注像素上方的邻接像素(图9的P2)是否是黑色像素(步骤S208)。在判定为关注像素上方的邻接像素为黑色像素时(步骤S208:是),设距黑色边缘的距离为2(步骤S210)。这样的判定是因为关注像素及上方的邻接像素为黑色像素,且上方的2像素隔离像素为白色像素。距黑色边缘的距离为2意味着关注像素为黑色边缘邻近像素。在判定为关注像素上方的邻接像素不是黑色像素时(步骤S208:是),处理进入步骤S212。On the other hand, when it is determined that there is no white pixel in the adjacent pixels of the pixel of interest (step S202: No), the edge detection unit 22 determines whether the 2-pixel isolated pixel above the pixel of interest (P9 in FIG. 9 ) is a white pixel (step S206 ). When it is determined that the 2-pixel separation pixel above the pixel of interest is a white pixel (step S206: Yes), the edge detection unit 22 determines whether the adjacent pixel (P2 in FIG. 9 ) above the pixel of interest is a black pixel (step S208). When it is determined that the adjacent pixel above the pixel of interest is a black pixel (step S208: Yes), the distance from the black edge is set to 2 (step S210). Such determination is because the pixel of interest and the adjacent pixel above are black pixels, and the 2-pixel isolation pixel above is white pixel. A distance of 2 from the black edge means that the pixel of interest is a black edge neighbor. When it is determined that the adjacent pixel above the pixel of interest is not a black pixel (step S208: Yes), the process proceeds to step S212.

下面,与上述步骤S206及S208中进行的判定上方的是否是黑色边缘邻近像素相同,分别对左方、右方、下方,执行关注像素是否是黑色边缘邻近像素的判定。即,在步骤S212及S214中,在关注像素的左方的2像素隔离像素(图9的P10)为白色像素(步骤S212:是),且关注像素左方的邻接像素(图9的P4)为黑色像素时(步骤S214:是),设距黑色边缘的距离为2(即关注像素为黑色边缘邻近像素)(步骤210).并且,在步骤S216及S218中,在关注像素右方的2像素隔离像素(图9的P11)为白色像素(步骤S216:是),且关注像素右方的邻接像素(图9的P5)为黑色像素时(步骤S218:是),也设距黑色边缘的距离为2(即关注像素为黑色边缘邻近像素)(步骤S210)。另外,在步骤S220及S222中,在关注像素下方的2像素隔离像素(图9的P12)为白色像素(步骤S220:是),且关注像素下方的邻接像素(图9的P7)为黑色像素时(步骤S222:是),也设距黑色边缘的距离为2(即关注像素为黑色边缘邻近像素)(步骤S210)。Next, similar to the determination of whether the upper pixel is a pixel adjacent to the black edge in steps S206 and S208 above, the determination of whether the pixel of interest is a pixel adjacent to the black edge is performed for the left, right, and lower sides, respectively. That is, in steps S212 and S214, the 2-pixel isolated pixel (P10 in FIG. 9 ) to the left of the pixel of interest is a white pixel (step S212: Yes), and the adjacent pixel to the left of the pixel of interest (P4 in FIG. 9 ) When it is a black pixel (step S214: yes), set the distance from the black edge to be 2 (that is, the attention pixel is a black edge adjacent pixel) (step 210). And, in steps S216 and S218, the 2 on the right side of the attention pixel The pixel isolation pixel (P11 of Fig. 9) is a white pixel (step S216: Yes), and when the adjacent pixel (P5 of Fig. 9 ) on the right side of the attention pixel is a black pixel (Step S218: Yes), the distance from the black edge is also set The distance is 2 (that is, the pixel of interest is a pixel adjacent to the black edge) (step S210). In addition, in steps S220 and S222, the 2-pixel isolated pixel below the pixel of interest (P12 in FIG. 9 ) is a white pixel (step S220: Yes), and the adjacent pixel below the pixel of interest (P7 in FIG. 9 ) is a black pixel (step S222: Yes), the distance from the black edge is also set to be 2 (that is, the pixel of interest is a pixel adjacent to the black edge) (step S210).

就上方、左方、右方、下方之一而言,在判定为关注像素不是黑色边缘邻近像素时,也设距黑色边缘的距离大于2(步骤S224)。距黑色边缘的距离大于2意味着关注像素为通常处理像素。For one of top, left, right, and bottom, when it is determined that the pixel of interest is not a pixel adjacent to the black edge, the distance from the black edge is also set to be greater than 2 (step S224). A distance from the black edge greater than 2 means that the pixel of interest is a normally processed pixel.

在通过图8示出的距边缘的距离判定处理(图2的步骤S110)判定为距黑色边缘的距离为1时(步骤S112:是),点分配部26(图1)对关注像素分配S点(步骤S114)。由于在关注像素位于图5的状态b示出的位置时,判定为距黑色边缘的距离为1(即关注像素为黑色边缘像素),所以点分配部26在输出缓冲器32的与关注像素对应的区域中记录「形成S点」的点的形成状态。之后,重复执行关注像素的移动和基于根据关注像素的判定结果的方法的点形成状态的确定,输出缓冲器32的状态如图5的状态c、状态d示出的那样迁移。When it is determined that the distance from the black edge is 1 (step S112: YES) by the distance determination process from the edge (step S110 of FIG. 2 ) shown in FIG. point (step S114). Since it is determined that the distance from the black edge is 1 (that is, the pixel of interest is a black edge pixel) when the pixel of interest is located at the position shown in state b of FIG. In the area of , record the formation status of the dot "form S dot". Thereafter, moving the pixel of interest and determining the dot formation state based on the determination result of the pixel of interest are repeated, and the state of the output buffer 32 transitions as shown in state c and state d in FIG. 5 .

关注像素移动至图5的状态e示出的位置时,在距边缘的距离判定处理(图2的步骤S110)中判定距黑色边缘的距离为2(步骤S116:是)。这时,点分配部26(图1)对关注像素分配M点,在输出缓冲器32的与关注像素对应的区域中记录「形成M点」的点的形成状态(步骤S118)。之后,重复执行关注像素的移动和基于根据关注像素的判定结果的方法的点形成状态的确定,输出缓冲器32的状态如图6的状态f、状态g、状态h、状态i示出的那样迁移。When the pixel of interest moves to the position shown in state e in FIG. 5 , it is determined that the distance from the black edge is 2 in the edge distance determination process (step S110 in FIG. 2 ) (step S116: YES). At this time, the dot assignment unit 26 ( FIG. 1 ) assigns M dots to the pixel of interest, and records the dot formation state of "M dots formed" in the area corresponding to the pixel of interest in the output buffer 32 (step S118). Afterwards, the movement of the pixel of interest and the determination of the dot formation state based on the method according to the determination result of the pixel of interest are repeated, and the state of the output buffer 32 is as shown in state f, state g, state h, and state i of FIG. 6 migrate.

在关注像素移动至图6的状态j示出的位置时,在距边缘的距离判定处理(图2的步骤S110)中判定为距黑色边缘的距离大于2。即,判定为距黑色边缘的距离既不是1也不是2(步骤S112及S116:否)。这时,关注像素成为通常处理像素,进行色转换处理23的色转换处理和半色调处理部24的半色调处理(步骤S120)。在半色调处理结果、对关注像素例如分配S点时,在输出缓冲器32的与关注像素对应的区域中记录「形成S点」的点的形成状态(参照图6的状态j)。之后,重复执行关注像素的移动和基于根据关注像素的判定结果的方法的点形成状态的确定,输出缓冲器32的状态如图7的状态k、状态1、状态m、状态n示出的那样迁移。状态n之后,若关注像素移动至印刷对象图像40(图3)的右下端,则在图2的步骤S126中判定为关注像素为图像下端,处理结束。When the pixel of interest moves to the position shown in state j in FIG. 6 , it is determined that the distance from the black edge is greater than 2 in the edge distance determination process (step S110 in FIG. 2 ). That is, it is determined that the distance from the black border is neither 1 nor 2 (steps S112 and S116: NO). At this time, the pixel of interest becomes a normal processing pixel, and the color conversion processing of the color conversion processing 23 and the halftone processing of the halftone processing unit 24 are performed (step S120 ). When, for example, S dots are assigned to the pixel of interest as a result of halftone processing, the dot formation state of "S dots formed" is recorded in the area corresponding to the pixel of interest in the output buffer 32 (see state j in FIG. 6 ). Afterwards, the movement of the pixel of interest and the determination of the dot formation state based on the method according to the determination result of the pixel of interest are repeated, and the state of the output buffer 32 is as shown in state k, state 1, state m, and state n of FIG. 7 migrate. After state n, if the pixel of interest moves to the lower right end of the print target image 40 ( FIG. 3 ), it is determined in step S126 of FIG. 2 that the pixel of interest is the lower end of the image, and the process ends.

通过以上说明的点形成状态的确定处理,将与印刷对象图像40(参照图3)的线图A的部分对应的印刷像素的点形成状态确定成图7的状态n示出的那样。在该状态下,在打印机200印刷图像时,在与黑色边缘像素对应的印刷像素中形成S点,在与黑色边缘像素对应的印刷像素中形成M点。并且,与距黑色边缘的距离大于2的通常处理像素对应的印刷像素的点形成状态由通常的半色调处理确定。By the dot formation state determination processing described above, the dot formation state of the printing pixels corresponding to the line pattern A portion of the print target image 40 (see FIG. 3 ) is determined as shown in state n of FIG. 7 . In this state, when the printer 200 prints an image, S dots are formed in the printing pixels corresponding to the black edge pixels, and M dots are formed in the printing pixels corresponding to the black edge pixels. Also, the dot formation state of the printing pixels corresponding to the normal processing pixels whose distance from the black edge is greater than 2 is determined by normal halftone processing.

图10是表示根据本实施例确定的点形成状态一例的说明图。在图10(a)中,表示印刷相当于印刷像素7像素量的宽度W1的线图时的点形成状态,在图10(b)中,表示印刷相当于印刷像素1像素量的宽度W2的线图时的点形成状态。图10的记号「S」表示「形成S点」的点形成状态。同样,记号「M」表示「形成M点」的点形成状态,记号「L」表示「形成L点」的点形成状态。在本实施例中,由于向与黑色边缘像素对应的全部的印刷像素分配相同尺寸的点(本实施例中为S点),所以抑制了印刷图像中的边缘的锯齿或欠缺,印刷画质提高。并且,如图10(b)所示,由于在印刷较细宽度的线图时,也对与全部的黑色边缘像素对应的印刷像素分配点,并不会产生点的欠缺,所以在印刷较细宽度的线图时,印刷画质也提高。FIG. 10 is an explanatory diagram showing an example of the dot formation state determined according to the present embodiment. In FIG. 10( a ), it shows the dot formation state when printing a line pattern with a width W1 corresponding to 7 pixels of printing pixels, and in FIG. The state of dot formation on line graphs. The symbol "S" in FIG. 10 indicates the dot formation state of "S dot formation". Similarly, the symbol "M" represents the dot formation state of "M dots are formed", and the symbol "L" represents the dot formation state of "L dots are formed". In this embodiment, since dots of the same size (S dots in this embodiment) are assigned to all printing pixels corresponding to black edge pixels, jagged edges or lack of edges in the printed image are suppressed, and the printing quality is improved. . And, as shown in FIG. 10 (b), since when printing a thinner width line pattern, dots are allocated to the printing pixels corresponding to all the black edge pixels, and dots will not be missing. Printing quality is also improved for line drawings with a wider width.

并且,在本实施例中,由于向与黑色边缘像素对应的印刷像素分配用于印刷的多个尺寸的点内最大尺寸的点(L点)以外的点(本实施例中为S点),所以抑制在边缘部分中的渗出或变粗,印刷画质进一步提高。另外,在本实施例中,由于也向与黑色边缘邻近像素对应的印刷像素分配用于印刷的多个尺寸的点内最大尺寸的点(L点)以外的点(本实施例中为M点),所以更好地抑制边缘部分中的渗出或变粗,印刷画质进一步提高。另外,在本实施例中,由于向与黑色边缘邻近像素对应的印刷像素分配尺寸比分配至与黑色边缘像素对应的印刷像素的点(本实施例中为S点)还大的点(本实施例中为M点),所以更好地抑制边缘部分中的渗出或变粗,印刷画质进一步提高。Also, in this embodiment, since dots (in this embodiment, S dots) other than the largest dot (L dot) among dots of a plurality of sizes used for printing are allocated to the printing pixels corresponding to the black edge pixels, Therefore, bleeding or thickening in the edge portion is suppressed, and the print quality is further improved. In addition, in this embodiment, since a dot other than a dot (L dot) of the largest size among dots of a plurality of sizes used for printing is also assigned to a printing pixel corresponding to a pixel adjacent to the black edge (M dot in this embodiment) ), so bleeding or thickening in the edge portion is better suppressed, and the print quality is further improved. In addition, in this embodiment, since a dot larger in size than a dot (S dot in this embodiment) assigned to a printed pixel corresponding to a black edge pixel is assigned to a pixel adjacent to the black edge (this embodiment M point in the example), so bleeding or thickening in the edge portion is better suppressed, and the printing quality is further improved.

B:变形例B: Variation

另外,本发明不限于上述实施例或实施方式,可在未脱离其宗旨范围内以各种方式实施,例如可有下面的变形例。In addition, this invention is not limited to the said Example or embodiment, It can implement in various forms in the range which does not deviate from the summary, For example, the following modification is possible.

B1变形例1:Modification 1 of B1:

在上述实施例中,向与黑色边缘像素对应的印刷像素分配最小尺寸的点、即S点,但如果向与黑色边缘像素对应的印刷像素全部分配相同尺寸的点,则也可分配M点或L点。由于在向全部的与黑色边缘像素对应的印刷像素分配M点(或L点)时,抑制了印刷图像中的边缘的锯齿或欠缺,并且,也不产生点的欠缺,所以印刷画质提高。另外,如果向与黑色边缘像素对应的印刷像素分配最大尺寸的点以外的点(S点或M点),则由于抑制了边缘部分中的渗出或变粗,所以更为优选。In the above-described embodiment, dots of the smallest size, that is, S dots, are assigned to printed pixels corresponding to black edge pixels, but if dots of the same size are assigned to all printed pixels corresponding to black edge pixels, then M dots or L point. When M dots (or L dots) are allocated to all the printing pixels corresponding to the black edge pixels, jaggedness or lack of edge in the printed image is suppressed and dot loss does not occur, so the print quality is improved. In addition, it is more preferable to assign dots (S dots or M dots) other than the largest size dots (S dots or M dots) to printed pixels corresponding to black edge pixels, since bleeding or thickening in the edge portion is suppressed.

另外,在上述实施例中,向与黑色边缘邻近像素对应的印刷像素分配M点,但只要向与黑色边缘邻近像素对应的印刷像素分配最大尺寸的点(L点)以外的点即可,例如,既可向全部的与黑色边缘邻近像素对应的印刷像素分配S点,也可向与黑色边缘邻近像素对应的印刷像素的一部分分配M点,向剩余的一部分分配S点。In addition, in the above-mentioned embodiment, M dots are assigned to the printing pixels corresponding to the pixels adjacent to the black edge, but it is only necessary to assign dots other than the largest size dot (L dot) to the printing pixels corresponding to the pixels adjacent to the black edge, for example , S points can be allocated to all the printing pixels corresponding to the pixels adjacent to the black edge, or M points can be allocated to a part of the printing pixels corresponding to the pixels adjacent to the black edge, and S points can be allocated to the remaining part.

并且,在上述实施例中,将构成图像数据的各像素判别为黑色边缘像素、黑色边缘邻近像素和通常处理像素3种类,但也可判别为黑色边缘像素和通常处理像素2种类。这时,也可就与通常处理像素对应的印刷像素由色转换处理及半色调处理确定点的形成状态,向与黑色边缘像素对应的印刷像素全部分配S点。即使这样,由于抑制了印刷图像中的边缘的锯齿或欠缺的,并且不产生点的欠缺,进而,抑制边缘部分中的渗出或变粗,所以印刷画质也提高。或者,这时,也可向与黑色边缘像素对应的印刷像素全部分配M点(或L点)。即使这样,由于在抑制印刷图像中的边缘的锯齿或欠缺的,并且不产生点的欠缺,所以印刷画质也提高。另外,将构成图像数据的各像素判别为黑色边缘像素、黑色边缘邻近像素和通常处理像素3种类,如果向与黑色边缘邻近像素对应的印刷像素分配最大尺寸的点(L点)以外的点,则由于良好地抑制边缘部分中的渗出或变粗,所以更为优选。In addition, in the above-mentioned embodiment, each pixel constituting the image data is discriminated into three types: black edge pixel, black edge adjacent pixel, and normal processing pixel, but it may be discriminated into two types: black edge pixel and normal processing pixel. In this case, it is also possible to assign S dots to all the printing pixels corresponding to the black edge pixels by determining the dot formation state by the color conversion processing and the halftone processing for the printing pixels corresponding to the normal processing pixels. Even so, jaggedness or chipping of the edge in the printed image is suppressed, and dot chipping does not occur, and bleeding or thickening of the edge portion is suppressed, so the print quality is also improved. Alternatively, at this time, M dots (or L dots) may be allocated to all printing pixels corresponding to black edge pixels. Even so, since jaggedness or chipping of edges in the printed image is suppressed, and dot chipping does not occur, the print quality is also improved. In addition, each pixel constituting the image data is discriminated into three types of black edge pixels, black edge adjacent pixels, and normal processing pixels, and if a dot other than the maximum size dot (L dot) is allocated to the printing pixel corresponding to the black edge adjacent pixel, Then, it is more preferable because bleeding or thickening in the edge portion is suppressed well.

B2变形例2:B2 modification 2:

在上述实施例中,说明了以仅由白色和黑色构成的图像为对象,使黑色边缘邻近中的印刷画质提高用的点形成状态的确定处理,但本发明也可适用于以仅由白色和用于图像印刷的点颜色的1种(例如蓝绿色或品红色、黄色)构成的图像为对象,使该点颜色的边缘邻近中的印刷画质提高用的点形成状态的确定处理。即,就构成图像数据的各像素而言,检测该点颜色的边缘像素或边缘邻近像素,与检测的边缘像素或边缘邻近像素对应的印刷像素通过分配规定的点,而非通常的半色调处理,可与上述实施例相同,使印刷画质提高。In the above-mentioned embodiment, the process of determining the dot formation state for improving the print quality in the vicinity of black edges has been described for an image composed only of white and black, but the present invention is also applicable to images composed of only white This is a process of determining the dot formation state for improving the print quality while the edge of the dot color is adjacent to an image composed of one dot color (for example, cyan, magenta, and yellow) used for image printing. That is, for each pixel constituting the image data, an edge pixel or an edge adjacent pixel of the color of the dot is detected, and a printed pixel corresponding to the detected edge pixel or edge adjacent pixel is assigned a predetermined dot instead of the normal halftone process. , the printing quality can be improved in the same way as in the above-mentioned embodiment.

并且,本发明也可适用于印刷介质的颜色是白色以外的情况。即,本发明也可适用于以仅由印刷介质的颜色(例如黑色)和用于图像印刷的点颜色的1种(例如蓝绿色或品红色、黄色)构成的图像为对象,使该点颜色的边缘邻近的印刷画质提高用的点形成状态的确定处理。In addition, the present invention is also applicable when the color of the printing medium is other than white. That is, the present invention can also be applied to an image composed of only the color of the printing medium (for example, black) and one of the dot colors used for image printing (for example, cyan, magenta, and yellow), and the dot color The determination processing of the dot formation state for improving the print quality near the edge.

B3变形例3:Modification 3 of B3:

在上述实施例中,在印刷对象图像40的整体中以相同的方法进行点形成状态的确定处理,但也可只将印刷对象图像40中包含文字或线图(记号、图形、曲线等)的文本区域作为对象,利用上述实施例的方法,进行点形成状态的确定。这时,例如既可根据图像数据的RGB值检测文本区域,又可根据像素的亮度值检测文本区域。In the above-described embodiment, the same method is used to determine the dot formation state in the entire image to be printed 40, but it is also possible to only include characters or line drawings (symbols, figures, curves, etc.) in the image to be printed 40 The text area is used as an object, and the dot formation state is determined by using the method of the above-mentioned embodiment. In this case, for example, the text region can be detected based on the RGB values of the image data, and the text region can also be detected based on the brightness value of the pixel.

B4变形例4:Modification 4 of B4:

在上述实施例中,图像数据为RGB数据,但图像数据未必是RGB数据。并且,在上述实施例中,打印机200通过使用CMYK4种颜色的墨水,形成3种类尺寸的点来进行印刷,但既可打印机200使用CMYK以外的其他颜色的墨水来进行印刷,也可通过形成2种类(或4种类以上)尺寸的点来进行印刷。In the above embodiments, the image data is RGB data, but the image data is not necessarily RGB data. In addition, in the above-mentioned embodiment, the printer 200 prints by using inks of 4 colors of CMYK to form dots of three types of sizes for printing, but the printer 200 may print by using inks of other colors than CMYK, or by forming 2 dots. Dots of different types (or more than 4 types) are used for printing.

另外,在上述实施例中,打印机200形成多个尺寸的点可通过根据形成的点的尺寸,使墨水喷射量不同来实现。例如,作为控制墨水喷射的驱动信号的波形,准备喷射分别与多个尺寸的点对应的墨水喷射量的墨水的波形,通过使用与形成的点的尺寸对应的波形来喷射墨水,形成期望尺寸的点。或者,也可通过在头上设置墨水喷射量互不相同的喷嘴,使用与形成的点的尺寸对应的喷嘴来喷射墨水,由此形成期望尺寸的点。并且,也可通过根据形成的点的尺寸,使墨水喷射次数不同,实现多个尺寸的点的形成。并且,还可将墨水加压,连续地喷出墨水的液柱,利用若将该液柱用加热器加热则液柱分离成点的原理,通过使加热脉冲的计时变化,实现形成多个尺寸的点。In addition, in the above-described embodiment, the formation of dots of a plurality of sizes by the printer 200 can be realized by varying the ejection amount of ink according to the size of the dots to be formed. For example, as a waveform of a drive signal for controlling ink ejection, a waveform of ink ejecting amounts corresponding to dots of a plurality of sizes is prepared, and by ejecting ink using a waveform corresponding to the size of a formed dot, a dot of a desired size is formed. point. Alternatively, it is also possible to form dots of a desired size by providing nozzles having different ink ejection amounts on the head and ejecting ink from nozzles corresponding to the size of the dots to be formed. In addition, it is also possible to form dots of a plurality of sizes by varying the number of times ink is ejected according to the size of the dots to be formed. In addition, the ink can also be pressurized to continuously eject the liquid column of the ink. Using the principle that if the liquid column is heated by a heater, the liquid column will be separated into dots, and the timing of the heating pulse can be changed to realize the formation of multiple sizes. point.

另外,在上述实施例中,色转换处理部23以通常处理像素(既不是黑色边缘像素,也不是黑色边缘邻近像素的像素)为对象进行色转换,但也可色转换处理部23进行通常处理像素以外的像素的色转换。例如,也可色转换处理部23对全部的像素进行从RGB数据向CMYK数据的色转换。这时,也可边缘检测部22使用CMYK数据来进行边缘判定。In addition, in the above-mentioned embodiment, the color conversion processing unit 23 performs color conversion on a normal processing pixel (a pixel that is neither a black edge pixel nor a pixel adjacent to a black edge pixel), but the color conversion processing unit 23 may perform normal processing. Color conversion of pixels other than pixels. For example, the color conversion processing unit 23 may perform color conversion from RGB data to CMYK data for all pixels. In this case, the edge detection unit 22 may perform edge determination using CMYK data.

并且,在上述实施例中,将从应用程序10输出的图像数据作为RGB数据,但图像数据也可是CMYK数据等其他色度系统的数据。在图像数据是CMYK数据等其他色度系统的数据时,边缘检测部22也可使用该其他色度系统的数据来进行边缘判定。In addition, in the above-mentioned embodiment, the image data output from the application program 10 is RGB data, but the image data may be data of other colorimetric systems such as CMYK data. When the image data is data in another colorimetric system such as CMYK data, the edge detection unit 22 may use the data in another colorimetric system to perform edge determination.

B5变形例5:Modification 5 of B5:

在上述实施例中,将图像处理装置构成为个人计算机100,但本发明也可适用于个人计算机100以外的进行确定点形成状态的图像处理的图像处理装置。例如,也可将图像处理装置构成为打印机200。In the above-described embodiments, the image processing device is configured as the personal computer 100 , but the present invention can also be applied to an image processing device other than the personal computer 100 that performs image processing for specifying the dot formation state. For example, the image processing device may also be configured as the printer 200 .

并且,在上述实施例中,也可将由硬件实现的结构的一部分替换成软件,相反,也可将由软件实现的结构的一部分替换成硬件。Furthermore, in the above-described embodiments, a part of the configuration realized by hardware may be replaced by software, and conversely, a part of the configuration realized by software may be replaced by hardware.

B6变形例6:Modification 6 of B6:

在上述实施例中,以向印刷介质喷射墨水用的头沿主扫描方向移动的打印机为例来说明,但也可适用于将头沿主扫描方向排列配置多个,头不移动的线性头打印机。In the above-mentioned embodiments, a printer in which the head for ejecting ink onto the printing medium moves in the main scanning direction is taken as an example, but it can also be applied to a linear head printer in which a plurality of heads are arranged in line in the main scanning direction and the heads do not move. .

并且,在上述实施例中,头具有多个喷嘴,但也可头只有1个喷嘴。Furthermore, in the above-mentioned embodiment, the head has a plurality of nozzles, but the head may have only one nozzle.

另外,在上述实施例中,个人计算机100具有输出缓冲器32,将表示确定的点的形成状态的数据记录于输出缓冲器32,但个人计算机100不必具有输出缓冲器32。也可采用与有无输出缓冲器32无关,将表示确定的点的形成状态的数据不记录于输出缓冲器32、而流入打印机200的流形式的结构。In addition, in the above-mentioned embodiment, the personal computer 100 has the output buffer 32 , and the data indicating the formation state of the determined dots is recorded in the output buffer 32 , but the personal computer 100 does not necessarily have the output buffer 32 . Regardless of the presence or absence of the output buffer 32 , a streaming configuration may be adopted in which the data indicating the formation state of certain dots is not recorded in the output buffer 32 but flows into the printer 200 .

并且,在上述实施例中,说明了使用纸作为印刷介质的实例,但本发明也可适用于向纸或布、胶片、电路基板这类纸以外的各种印刷介质的印刷。Furthermore, in the above-mentioned embodiments, an example using paper as a printing medium was described, but the present invention is also applicable to printing on various printing media other than paper such as paper, cloth, film, and circuit board.

并且,上述实施例中的关注像素的选择顺序可任意地变更。In addition, the order of selecting pixels of interest in the above-described embodiments can be changed arbitrarily.

Claims (11)

1、一种图像处理装置,根据表示由多个像素构成的图像的图像数据,确定利用多个尺寸的点印刷所述图像时的点的形成状态,具备:1. An image processing device for determining, based on image data representing an image composed of a plurality of pixels, a dot formation state when the image is printed with dots of a plurality of sizes, comprising: 边缘检测部,从构成所述图像数据的像素中,检测出用于所述图像的印刷的点的颜色的像素,即所述图像中位于边缘的点颜色边缘像素;和an edge detection unit that detects, from pixels constituting the image data, a pixel of a dot color used for printing of the image, that is, a dot color edge pixel positioned at an edge in the image; and 点分配部,在所述图像印刷时对所述点颜色边缘像素分配相同尺寸的点。The dot allocation unit allocates dots of the same size to the dot color edge pixels when the image is printed. 2、根据权利要求1所述的图像处理装置,其特征在于:2. The image processing device according to claim 1, characterized in that: 所述相同尺寸的点是所述多个尺寸的点内的最大尺寸的点以外的点。The dots of the same size are dots other than the dot of the largest size among the dots of the plurality of sizes. 3、根据权利要求1或2所述的图像处理装置,其特征在于:3. The image processing device according to claim 1 or 2, characterized in that: 所述边缘检测部从构成所述图像数据的像素中,检测用于所述图像的印刷的点的颜色的像素,即所述图像中距边缘的距离为规定值以下的所述点颜色边缘像素以外的点颜色边缘邻近像素;The edge detection unit detects, from among pixels constituting the image data, a pixel of a dot color used for printing the image, that is, an edge pixel of the dot color in the image whose distance from an edge is equal to or less than a predetermined value. Points other than color edge adjacent pixels; 所述点分配部在所述图像印刷时对所述点颜色边缘邻近像素分配所述多个尺寸的点内的最大尺寸的点以外的点。The dot allocating unit allocates dots other than the largest dot among the dots of the plurality of sizes to the edge adjacent pixels of the dot color when the image is printed. 4、根据权利要求3所述的图像处理装置,其特征在于:4. The image processing device according to claim 3, characterized in that: 所述多个尺寸为3种类以上的尺寸;The multiple sizes are more than 3 types of sizes; 在所述图像的印刷时,对所述点颜色边缘邻近像素的点的尺寸比在所述图像的印刷时,对所述点颜色边缘像素的点的尺寸大。When the image is printed, the dot size for the dot-color edge adjacent pixels is larger than the dot size for the dot-color edge pixels when the image is printed. 5、根据权利要求3所述的图像处理装置,其特征在于:5. The image processing device according to claim 3, characterized in that: 所述点分配部包含通过半色调处理,对构成所述图像数据的像素内的除了所述点颜色边缘像素和所述点颜色边缘邻近像素以外的像素,确定点的形成状态的半色调处理部。The dot allocating unit includes a halftone processing unit for specifying a dot formation state for pixels other than the dot color edge pixel and the dot color edge adjacent pixel among the pixels constituting the image data by halftone processing. . 6、根据权利要求1所述的图像处理装置,其特征在于:6. The image processing device according to claim 1, characterized in that: 所述图像是仅由白色和用于所述图像的印刷的点的颜色的1种构成的图像。The image is an image composed of only one of white and the color of dots used for printing the image. 7、根据权利要求1所述的图像处理装置,其特征在于:7. The image processing device according to claim 1, characterized in that: 所述图像是仅由黑色和用于所述图像的印刷的点的颜色的1种构成的图像。The image is an image composed of only one of black and the color of dots used for printing the image. 8、根据权利要求1所述的图像处理装置,其特征在于:8. The image processing device according to claim 1, characterized in that: 所述多个尺寸的点由多个墨水喷出量形成。The dots of the plurality of sizes are formed by the plurality of ink ejection amounts. 9、根据权利要求1所述的图像处理装置,其特征在于:9. The image processing device according to claim 1, characterized in that: 所述多个尺寸的点由多个墨水喷出次数形成。The dots of the plurality of sizes are formed by a plurality of ink ejection times. 10、根据权利要求1所述的图像处理装置,其特征在于:10. The image processing device according to claim 1, characterized in that: 所述边缘检测部从根据RGB色空间的构成所述图像数据的像素中,检测出所述点颜色边缘像素。The edge detection unit detects the dot color edge pixels from among the pixels constituting the image data based on the RGB color space. 11、一种图像处理方法,根据表示由多个像素构成的图像的图像数据,确定利用多个尺寸的点印刷所述图像时的点的形成状态,具备:11. An image processing method for determining, based on image data representing an image composed of a plurality of pixels, a dot formation state when the image is printed using dots of a plurality of sizes, comprising: 从构成所述图像数据的像素中,检测出用于所述图像的印刷的点的颜色的像素,即所述图像中位于边缘的点颜色边缘像素的工序;和A step of detecting, from pixels constituting the image data, a pixel of a dot color used for printing of the image, that is, a dot color edge pixel positioned at an edge in the image; and 在所述图像印刷时,对所述点颜色边缘像素分配相同尺寸的点的工序。A step of allocating dots of the same size to the dot color edge pixels at the time of image printing.
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CN109016866A (en) * 2017-06-12 2018-12-18 精工爱普生株式会社 Image processing apparatus and print system
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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
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Application publication date: 20090722