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1. 发明授权

US08554000B2 Image forming apparatus and method 有权
标题翻译：图像形成装置及方法
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。

2. 发明申请

US20080317360A1 IMAGE FORMING APPARATUS AND METHOD 有权
标题翻译：图像形成装置和方法
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。

3. 发明授权

US08405878B2 Apparatus and method of forming images 失效
标题翻译：图像形成装置及方法
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。

4. 发明申请

US20060077467A1 Error diffusion apparatus with cluster dot 审中-公开
标题翻译：具有簇点误差扩散装置
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。

5. 发明申请

US20050129309A1 Error diffusion method and apparatus using area ratio in CMYKRGBW cube 审中-公开
标题翻译：在CMYKRGBW立方体中使用面积比的误差扩散方法和装置
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。

6. 发明授权

US07301673B2 Error diffusion processing method 失效
标题翻译：误差扩散处理方法
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。

7. 发明申请

US20050007635A1 Method and apparatus for determining error diffusion coefficients 有权
标题翻译：用于确定误差扩散系数的方法和装置
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）。

8. 发明授权

US07421120B2 Apparatus correcting image by luminance histogram 失效
标题翻译：装置通过亮度直方图校正图像
公开(公告)号：US07421120B2
公开(公告)日：2008-09-02
申请号：US11052044
申请日：2005-02-08
申请人： Ki-min Kang
发明人： Ki-min Kang
IPC分类号： G06K9/00
CPC分类号： G06T5/40 , G06T5/009
摘要： An apparatus and method for selectively increasing contrasts of bright and dark regions and automatically determining an appropriate degree of correction such that the image has a corrected luminance that is closer to an estimated optimal average luminance (EOAL) determined from a quantity of light at pickup. The apparatus for correcting the image comprises a real average luminance calculating means for calculating a Real Average Luminance (RAL) of an incoming image from a luminance histogram representing a luminance distribution of pixels of the incoming image, an optimal average luminance estimating means for obtaining a quantity of light using information with respect to a pickup condition of the incoming image and for estimating the EOAL from the quantity of light, and a luminance correcting means for correcting a luminance of pixels of the incoming image based on a luminance difference (ΔL) between the RAL and the EOAL.
摘要翻译：一种用于选择性地增加亮区和暗区对比度的装置和方法，并且自动确定适当的校正程度，使得图像具有更接近从拾取光量确定的估计的最佳平均亮度（EOAL）的校正亮度。用于校正图像的装置包括：实际平均亮度计算装置，用于从表示输入图像的像素的亮度分布的亮度直方图计算输入图像的实际平均亮度（RAL）;最佳平均亮度估计装置，使用关于输入图像的拾取条件的信息并根据光量估计EOAL的光量的亮度校正装置，以及用于根据输入图像的像素的亮度来校正入射图像的像素的亮度的亮度差（DeltaL） RAL和EOAL。

9. 发明申请

US20060238812A1 Multi-level halftoning apparatus and method thereof 审中-公开
标题翻译：多级半色调装置及其方法
公开(公告)号：US20060238812A1
公开(公告)日：2006-10-26
申请号：US11368638
申请日：2006-03-07
申请人： Ki-min Kang
发明人： Ki-min Kang
IPC分类号： H04N1/60
CPC分类号： H04N1/40087
摘要： A multi-level halftoning apparatus and method. The multi-level halftoning apparatus includes a two-level quantizer to quantize an input pixel to a white level or an intermediate level between the white level and a black level according to a pixel value of the input pixel, a multi-level generator to convert the pixel quantized to the intermediate level into one of the black level and a plurality of levels between the intermediate level and the black level, and an error filter to distribute a difference value between the pixel value of the input pixel and the level value quantized by the two-level quantizer to adjacent pixels to the input pixel within a predetermined range, to adjust pixel values of the adjacent pixels to be input to the two-level quantizer. Accordingly, since white dots exist in a dark region, it is possible to prevent only black and gray dots from appearing in the dark region and thus prevent an entire image from becoming dark. Also, since a multi-level image is substituted for a two-level image, it is possible to prevent a phenomenon in which gray-levels are not distinguished in the dark region due to an increase of a dot occupancy rate, without increase in the number of dots applied on a print sheet.
摘要翻译：多级半色调装置和方法。多级半色调装置包括：二电平量化器，用于根据输入像素的像素值将输入像素量化为白电平或白电平与黑电平之间的中间电平;多电平发生器，用于转换量化到中间电平的像素变成黑电平和中间电平与黑电平之间的多个电平之一，以及误差滤波器，用于将输入像素的像素值和由将两级量化器输入到预定范围内与输入像素相邻的像素，以调整要输入到两电平量化器的相邻像素的像素值。因此，由于在黑暗区域存在白点，因此可以防止黑色和灰色点在黑色区域中出现，从而防止整个图像变暗。此外，由于多级图像代替二级图像，因此可以防止由于点占用率的增加而在黑暗区域中灰度级别不区分的现象，而不增加打印纸上应用的点数。

10. 发明申请

US20050249409A1 Apparatus correcting image by luminance histogram 失效
标题翻译：装置通过亮度直方图校正图像
公开(公告)号：US20050249409A1
公开(公告)日：2005-11-10
申请号：US11052044
申请日：2005-02-08
申请人： Ki-min Kang
发明人： Ki-min Kang
IPC分类号： H04N5/57 , G06K9/00 , G06K9/40 , G06T5/40
CPC分类号： G06T5/40 , G06T5/009
摘要： An apparatus and method for selectively increasing contrasts of bright and dark regions and automatically determining an appropriate degree of correction such that the image has a corrected luminance that is closer to an estimated optimal average luminance (EOAL) determined from a quantity of light at pickup. The apparatus for correcting the image comprises a real average luminance calculating means for calculating a Real Average Luminance (RAL) of an incoming image from a luminance histogram representing a luminance distribution of pixels of the incoming image, an optimal average luminance estimating means for obtaining a quantity of light using information with respect to a pickup condition of the incoming image and for estimating the EOAL from the quantity of light, and a luminance correcting means for correcting a luminance of pixels of the incoming image based on a luminance difference (ΔL) between the RAL and the EOAL.
摘要翻译：一种用于选择性地增加亮区和暗区对比度的装置和方法，并且自动确定适当的校正程度，使得图像具有更接近从拾取光量确定的估计的最佳平均亮度（EOAL）的校正亮度。用于校正图像的装置包括：实际平均亮度计算装置，用于从表示输入图像的像素的亮度分布的亮度直方图计算输入图像的实际平均亮度（RAL）;最佳平均亮度估计装置，使用关于输入图像的拾取条件的信息并根据光量估计EOAL的光量的亮度校正装置，以及用于根据输入图像的像素的亮度来校正入射图像的像素的亮度的亮度差（DeltaL） RAL和EOAL。

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