公开(公告)号：US07533953B2

公开(公告)日：2009-05-19

申请号：US11519939

申请日：2006-09-13

申请人： Terekhov Vladislav ,  Ki-min Kang

发明人： Terekhov Vladislav ,  Ki-min Kang

IPC分类号： B41J29/38

CPC分类号： B41J29/393 ,  B41J2/2139

摘要： A method and apparatus for compensating for a defective nozzle in an inkjet image forming apparatus are provided, in which a defective nozzle of a nozzle unit is detected, ejecting statuses of nozzles of the nozzle unit are checked which eject ink at a compensation position on a printing medium corresponding to the defective nozzle and nozzles of the nozzle unit which eject ink at positions adjacent to the compensation position when the defective nozzle is detected, and at least three pieces of image data to be printed at the compensation position and the adjacent positions are swapped and printed according to the ejecting statuses of the nozzle. Accordingly, the image data are swapped for each other in order to be printed or divided and then printed. Thus, image quality degradation such as a visible white line can be prevented.

摘要翻译： 提供一种用于补偿喷墨图像形成装置中的有缺陷的喷嘴的方法和装置，其中检测到喷嘴单元的缺陷喷嘴，检查喷嘴单元的喷嘴的喷射状态，这些喷嘴状态在 对应于缺陷喷嘴的打印介质和喷嘴单元的喷嘴，其在检测到有缺陷的喷嘴时在与补偿位置相邻的位置喷射墨，并且在补偿位置和相邻位置处要打印的至少三个图像数据是 根据喷嘴的喷射状态进行交换和打印。 因此，图像数据彼此交换以便打印或分割，然后打印。 因此，可以防止诸如可见白线的图像质量劣化。

公开(公告)号：US20070115507A1

公开(公告)日：2007-05-24

申请号：US11520676

申请日：2006-09-14

申请人： Terekhov Vladislav ,  Ki-min Kang

发明人： Terekhov Vladislav ,  Ki-min Kang

IPC分类号： H04N1/405

CPC分类号： B41J2/2139 ,  H04N1/4015 ,  H04N1/405

摘要： Provided are a method and apparatus for compensating for the degradation of a print image due to a malfunctioning nozzle that irregularly ejects ink. The method includes detecting a malfunctioning nozzle among nozzles installed in an inkjet image forming apparatus and increasing a dithering threshold of an adjacent position to a compensation position printed by the detected malfunctioning nozzle. The method adjusts a dithering threshold of a print position of the malfunctioning nozzle or a dithering threshold of an adjacent print position, and thus performs a halftoning transaction and prints an image. Accordingly, the degradation of print quality such as a visible white band can be prevented and the lifetime of the printhead can be lengthened.

摘要翻译： 提供了一种用于补偿由于不规则地喷射墨水的喷嘴故障导致的打印图像劣化的方法和装置。 该方法包括检测安装在喷墨图像形成装置中的喷嘴中的故障喷嘴，并将相邻位置的抖动阈值增加到由检测到的故障喷嘴打印的补偿位置。 该方法调节故障喷嘴的打印位置的抖动阈值或相邻打印位置的抖动阈值，从而执行半色调事务并打印图像。 因此，可以防止诸如可见白色带的打印质量的劣化，并且可以延长打印头的寿命。

公开(公告)号：US20070085866A1

公开(公告)日：2007-04-19

申请号：US11519939

申请日：2006-09-13

申请人： Terekhov Vladislav ,  Ki-min Kang

发明人： Terekhov Vladislav ,  Ki-min Kang

IPC分类号： B41J29/38

CPC分类号： B41J29/393 ,  B41J2/2139

摘要： A method and apparatus for compensating for a defective nozzle in an inkjet image forming apparatus are provided, in which a defective nozzle of a nozzle unit is detected, ejecting statuses of nozzles of the nozzle unit are checked which eject ink at a compensation position on a printing medium corresponding to the defective nozzle and nozzles of the nozzle unit which eject ink at positions adjacent to the compensation position when the defective nozzle is detected, and at least three pieces of image data to be printed at the compensation position and the adjacent positions are swapped and printed according to the ejecting statuses of the nozzle. Accordingly, the image data are swapped for each other in order to be printed or divided and then printed. Thus, image quality degradation such as a visible white line can be prevented.

摘要翻译： 提供一种用于补偿喷墨图像形成装置中的有缺陷的喷嘴的方法和装置，其中检测到喷嘴单元的缺陷喷嘴，检查喷嘴单元的喷嘴的喷射状态，这些喷嘴状态在 对应于缺陷喷嘴的打印介质和喷嘴单元的喷嘴，其在检测到有缺陷的喷嘴时在与补偿位置相邻的位置喷射墨，并且在补偿位置和相邻位置处要打印的至少三个图像数据是 根据喷嘴的喷射状态进行交换和打印。 因此，图像数据彼此交换以便打印或分割，然后打印。 因此，可以防止诸如可见白线的图像质量劣化。

公开(公告)号：US08405878B2

公开(公告)日：2013-03-26

申请号：US12546906

申请日：2009-08-25

申请人： Ki-min Kang

发明人： Ki-min Kang

IPC分类号： H04N1/405

CPC分类号： H04N1/40087 ,  H04N1/4055

摘要： An image forming apparatus which provides a plurality of developers that have different densities for each color, and an image forming method thereof. The image forming method may include detecting a remaining amount of a first developer; and forming an image by expressing a gray scale of inputted data according to a multi-bit halftoning process using a second developer that is similar to the first developer in color and higher than the first developer in density if the remaining amount of the first developer is a preset value or less.

摘要翻译： 提供对于每种颜色具有不同密度的多个显影剂的图像形成装置及其图像形成方法。 图像形成方法可以包括检测第一显影剂的剩余量; 并且如果第一显影剂的剩余量是第一显影剂的剩余量，则使用与第一显影剂颜色相似的第二显影剂和高于第一显影剂的浓度的第二显影剂，根据多位半色调处理，通过表达输入数据的灰度来形成图像 预设值或更小。

公开(公告)号：US20060077467A1

公开(公告)日：2006-04-13

申请号：US11238065

申请日：2005-09-29

申请人： Ki-min Kang

发明人： Ki-min Kang

IPC分类号： G06F15/00

CPC分类号： H04N1/4053

摘要： Disclosed is an error diffusion apparatus with cluster dot. The error diffusion apparatus for performing an error diffusion on a second pixel based on a first pixel includes: a binary processing unit for binarizing a tone value of the first pixel based on a predetermined threshold; a binary error diffusion unit for computing a binary error value based on a difference between the tone value of the first pixel and a binary tone value for the first pixel, and reflecting the binary error value on a tone value of the second pixel applied to the binary processing unit; and a cluster forming unit for deciding whether to form a cluster for the first and second pixels, in reference to a predetermined cluster pattern and a binary tone value of the first pixel. The error diffusing apparatus reduces switching noises generated from the image forming process in pixel unit, and expands the tone value range of an image. In addition, the error diffusing apparatus prevents deteriorations in image quality by limiting the cluster size and restricting the cluster formation in the shadow and highlight areas of an image.

摘要翻译： 公开了具有簇点的误差扩散装置。 用于基于第一像素在第二像素上执行误差扩散的误差扩散装置包括：二进制处理单元，用于基于预定阈值二值化第一像素的色调值; 二进制误差扩散单元，用于基于第一像素的色调值和第一像素的二进制色调值之间的差计算二进制误差值，并且反映二值误差值对应用于第二像素的第二像素的色调值 二进制处理单元; 以及簇形成单元，用于参照预定的聚类图案和第一像素的二进制色调值来决定是否形成第一和第二像素的簇。 误差扩散装置减少以像素为单位从图像形成处理产生的开关噪声，并且扩大图像的色调值范围。 此外，误差扩散装置通过限制簇大小和限制在阴影中的簇形成并突出显示图像的区域来防止图像质量的恶化。

公开(公告)号：US20050129309A1

公开(公告)日：2005-06-16

申请号：US11000503

申请日：2004-12-01

申请人： Ki-min Kang ,  Goo-soo Gahang ,  Choo-woo Kim ,  Hyeon-seok Seo

发明人： Ki-min Kang ,  Goo-soo Gahang ,  Choo-woo Kim ,  Hyeon-seok Seo

IPC分类号： H04N1/405 ,  G06K9/00 ,  G06K9/40 ,  H04N1/52

CPC分类号： H04N1/52

摘要： An error diffusion method and apparatus using an area ratio of candidate colors in a CMYKRGBW cube, wherein the candidate colors are determined in response to an input value, and the CMYKRGBW cube is converted into a color space consisting of only four colors so that the candidate colors can be evenly distributed. The color space is then expressed using the area ratio of the candidate colors. Accordingly, it is possible to evenly distribute candidate colors in all gray-scale regions, including a highlight region, thereby obtaining a soft image that does not have a pattern that is strenuous on the eye of an observer.

摘要翻译： 一种使用CMYKRGBW立方体中的候选颜色的面积比的误差扩散方法和装置，其中响应于输入值确定候选颜色，并且将CMYKRGBW立方体转换成仅由四种颜色组成的颜色空间，使得候选 颜色可均匀分布。 然后使用候选颜色的面积比表示颜色空间。 因此，可以在包括高亮区域的所有灰度区域中均匀分布候选颜色，从而获得在观察者的眼睛上不具有剧烈花纹的软图像。

公开(公告)号：US08554000B2

公开(公告)日：2013-10-08

申请号：US12013608

申请日：2008-01-14

申请人： Jeong-hwan Cho ,  Ki-min Kang

发明人： Jeong-hwan Cho ,  Ki-min Kang

IPC分类号： G06K9/36

CPC分类号： H04N1/40062 ,  H04N1/6016

摘要： An image forming apparatus and an image forming method thereof are provided. An image forming apparatus according to an exemplary embodiment of the present general inventive concept comprises a decoder to decode a compressed image to convert the compressed image into image data, a pure black determining unit to determine whether the image data is pure black by using information of the converted image data, a section classifying unit to classify the image data into a text section and an image section by using a result of the pure black determination, and a color coordinate converter to perform color coordinate conversion on the image section of the classified sections. Therefore, it is possible to improve readability of black text.

摘要翻译： 提供了一种图像形成装置及其图像形成方法。 根据本发明总体构思的示例性实施例的图像形成装置包括：解码器，用于解码压缩图像以将压缩图像转换成图像数据;纯黑色确定单元，用于通过使用图像数据的信息来确定图像数据是否为纯黑色 转换的图像数据，通过使用纯黑色确定的结果将图像数据分类为文本部分和图像部分的部分分类单元和对分类部分的图像部分执行颜色坐标转换的颜色坐标转换器 。 因此，可以提高黑色文本的可读性。

公开(公告)号：US20080317360A1

公开(公告)日：2008-12-25

申请号：US12013608

申请日：2008-01-14

申请人： Jeong-hwan CHO ,  Ki-min Kang

发明人： Jeong-hwan CHO ,  Ki-min Kang

IPC分类号： G06K9/36

CPC分类号： H04N1/40062 ,  H04N1/6016

摘要： An image forming apparatus and an image forming method thereof are provided. An image forming apparatus according to an exemplary embodiment of the present general inventive concept comprises a decoder to decode a compressed image to convert the compressed image into image data, a pure black determining unit to determine whether the image data is pure black by using information of the converted image data, a section classifying unit to classify the image data into a text section and an image section by using a result of the pure black determination, and a color coordinate converter to perform color coordinate conversion on the image section of the classified sections. Therefore, it is possible to improve readability of black text.

摘要翻译： 提供了一种图像形成装置及其图像形成方法。 根据本发明总体构思的示例性实施例的图像形成装置包括：解码器，用于解码压缩图像以将压缩图像转换成图像数据;纯黑色确定单元，用于通过使用图像数据的信息来确定图像数据是否为纯黑色 转换的图像数据，通过使用纯黑色确定的结果将图像数据分类为文本部分和图像部分的部分分类单元和对分类部分的图像部分执行颜色坐标转换的颜色坐标转换器 。 因此，可以提高黑色文本的可读性。

公开(公告)号：US07301673B2

公开(公告)日：2007-11-27

申请号：US10199003

申请日：2002-07-22

申请人： Ki-min Kang

发明人： Ki-min Kang

IPC分类号： H04N1/40 ,  G06K9/36

CPC分类号： H04N1/4053

摘要： An error diffusion processing method includes determining a binary value of an input pixel according to a grayscale level of the input pixel, searching a nearest pixel that has the same binary value as the input pixel, and comparing a measured actual distance with an ideal distance between the two pixels, so as to compute a first adjustment value. By applying a noise array to an input image, a second adjustment value is also computed according to a noise value of the input pixel. Based on the first and second adjustment values, a threshold is adjusted to determine the binary value of the input pixel. The adjusted threshold is compared with the grayscale level of the input pixel, and according to the comparison result, the binary value of the input pixel is determined. By diffusing an error value, which is a difference between the grayscale level and the determined binary value of the input pixel, to neighboring pixels, the grayscale level of the neighboring pixels is changed. A third adjustment value is also applied to reduce a diagonal pattern due to binarization of the input pixel, while encouraging a perpendicular pattern.

摘要翻译： 误差扩散处理方法包括根据输入像素的灰阶级确定输入像素的二进制值，搜索具有与输入像素相同的二进制值的最近像素，并将测量的实际距离与 两个像素，以便计算第一调整值。 通过将噪声阵列应用于输入图像，还根据输入像素的噪声值来计算第二调整值。 基于第一和第二调整值，调整阈值以确定输入像素的二进制值。 将调整后的阈值与输入像素的灰度级进行比较，根据比较结果确定输入像素的二进制值。 通过将灰度级和输入像素的确定的二进制值之间的差异值扩散到相邻像素，改变相邻像素的灰度等级。 还应用第三调整值以减少由于输入像素的二值化导致的对角图案，同时鼓励垂直图案。

公开(公告)号：US20050007635A1

公开(公告)日：2005-01-13

申请号：US10873506

申请日：2004-06-23

申请人： Ki-min Kang ,  Goo-soo Gahang ,  Choon-woo Kim ,  Hyeon-seok Seo

发明人： Ki-min Kang ,  Goo-soo Gahang ,  Choon-woo Kim ,  Hyeon-seok Seo

IPC分类号： H04N1/409 ,  H04N1/40 ,  H04N1/405

CPC分类号： H04N1/4052

摘要： Provided are a method and apparatus for determining error diffusion coefficients. The method includes: (a) setting N groups of error diffusion coefficients (N is a positive integer), in which each group includes a plurality of coefficients; (b) binarizing an image having one gray level value using each of the N groups of error diffusion coefficients; (c) detecting N fit values with respect to N binary-coded images using an evaluation function; (d) determining whether the fit values are detected a predetermined number of times; (e) when a detection number of the fit values does not coincide with the predetermined number of times, reproducing the N groups of error diffusion coefficients according to reproduction rates determined by the N fit values; (f) selecting optional error diffusion coefficients in the reproduced N groups of error diffusion coefficients, and substituting portions of data of selected error diffusion coefficients with each other; and (g) determining the N groups of error diffusion coefficients including the error diffusion coefficients containing substituted data as new error diffusion coefficients, and returning to step (b).

摘要翻译： 提供了一种用于确定误差扩散系数的方法和装置。 该方法包括：（a）设置N组误差扩散系数（N为正整数），其中每组包括多个系数; （b）使用N组误差扩散系数中的每一个二值化具有一个灰度值的图像; （c）使用评估函数检测关于N个二进制编码图像的N个拟合值; （d）确定拟合值是否被检测到预定次数; （e）当拟合值的检测次数与预定次数不一致时，根据由N拟合值确定的再现速率再现N组误差扩散系数; （f）在再现的N组误差扩散系数中选择可选的误差扩散系数，并将所选择的误差扩散系数的数据部分相互替代; （g）确定N组误差扩散系数，包括包含取代数据的误差扩散系数作为新的误差扩散系数，并返回步骤（b）。