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：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。

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。

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。

公开(公告)号：US08432580B2

公开(公告)日：2013-04-30

申请号：US11280277

申请日：2005-11-17

申请人： Ki-min Kang

发明人： Ki-min Kang

IPC分类号： H04N1/40 ,  H04N1/405 ,  G06K15/00

CPC分类号： H04N1/4052 ,  G06K9/38

摘要： An error diffusion processing method and apparatus quantizes an input grayscale value of a pixel (m, n) of an input image based on a determination of whether the input grayscale value belongs to one of ranges divided by a plurality of thresholds. The ranges include at least one shadow area which is darker than a median grayscale value, and the input grayscale value is quantized to a predetermined grayscale value which is brighter than the median grayscale value in a predetermined method and thereby a binary grayscale value of the pixel (m, n) is determined. The error diffusion processing method and apparatus obtains an error from the input grayscale value and the binary grayscale value of the pixel (m, n), and distributes the error to neighboring pixels of the pixel (m, n) according to a predetermined error diffusion coefficient and modifies input grayscale values of the neighboring pixels. Therefore, an undesirable shadow area appearing due to the overlapping of toner particles can be prevented, and also an image similar to the input image in grayscale level can be obtained.

摘要翻译： 误差扩散处理方法和装置根据输入灰度值是否属于由多个阈值划分的范围之一的确定，对输入图像的像素（m，n）的输入灰度值进行量化。 所述范围包括比中值灰度值更暗的至少一个阴影区域，并且将输入灰度值量化为比预定方法中的中值灰度值更亮的预定灰度值，由此该像素的二进制灰度值 （m，n）。 误差扩散处理方法和装置从输入灰度值和像素（m，n）的二进制灰度值获得误差，并根据预定的误差扩散将误差分布到像素（m，n）的相邻像素 系数并修改相邻像素的输入灰度值。 因此，可以防止由于调色剂颗粒的重叠而出现的不期望的阴影区域，并且还可以获得与灰度级输入图像类似的图像。

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：US07181087B2

公开(公告)日：2007-02-20

申请号：US10309328

申请日：2002-12-04

申请人： Ki-min Kang ,  Won-kyoung Cho

发明人： Ki-min Kang ,  Won-kyoung Cho

IPC分类号： G06K9/38 ,  G06K15/00

CPC分类号： H04N1/4053 ,  H04N1/409

摘要： An image brightness level conversion method and apparatus which converts a multi-valued brightness level of an input pixel to a bi-valued brightness level using a threshold value. If the input pixel is determined to belong to an edge area, a predetermined reasonable distance by which dots should be isolated is reduced by a noise component and the threshold value is produced using the reduced distance. If the input pixel is determined not to belong to the edge area, the threshold value is produced without using the noise component. The method provides a uniform distribution of dots on the 2-dimensional space, a decrease in a generation of a void region where no dots appear around the edge area, a reduction of unpleasant appearing fixed patterns between dots, and a decrease in the generation of a typical pattern in which dots with a same color are diagonally arrayed.

摘要翻译： 一种使用阈值将输入像素的多值亮度电平转换为双值亮度电平的图像亮度电平转换方法和装置。 如果输入像素被确定为属于边缘区域，则通过噪声分量减小要隔离点的预定合理距离，并且使用减小的距离来产生阈值。 如果确定输入像素不属于边缘区域，则在不使用噪声分量的情况下产生阈值。 该方法在二维空间上提供均匀的点分布，减少边缘区域周围没有点出现的空隙区域的产生，点之间出现不愉快的固定图案的减少以及生成 具有相同颜色的点的对角排列的典型图案。

公开(公告)号：US20060126958A1

公开(公告)日：2006-06-15

申请号：US11280277

申请日：2005-11-17

申请人： Ki-min Kang

发明人： Ki-min Kang

IPC分类号： G06K9/36 ,  H04N1/40

CPC分类号： H04N1/4052 ,  G06K9/38

摘要： An error diffusion processing method and apparatus quantizes an input grayscale value of a pixel (m, n) of an input image based on a determination of whether the input grayscale value belongs to one of ranges divided by a plurality of thresholds. The ranges include at least one shadow area which is darker than a median grayscale value, and the input grayscale value is quantized to a predetermined grayscale value which is brighter than the median grayscale value in a predetermined method and thereby a binary grayscale value of the pixel (m, n) is determined. The error diffusion processing method and apparatus obtains an error from the input grayscale value and the binary grayscale value of the pixel (m, n), and distributes the error to neighboring pixels of the pixel (m, n) according to a predetermined error diffusion coefficient and modifies input grayscale values of the neighboring pixels. Therefore, an undesirable shadow area appearing due to the overlapping of toner particles can be prevented, and also an image similar to the input image in grayscale level can be obtained.

公开(公告)号：US08705854B2

公开(公告)日：2014-04-22

申请号：US12552345

申请日：2009-09-02

申请人： Ki-min Kang

发明人： Ki-min Kang

IPC分类号： G06K9/36

CPC分类号： H04N1/40012 ,  H04N1/2307 ,  H04N1/233 ,  H04N1/2369 ,  H04N1/46

摘要： An image processing method and an image forming apparatus using the same. The method of processing includes dividing an image into a predetermined number of blocks, calculating an average of color signals of pixels existing in each of the blocks divided, classifying the blocks into color blocks and monochrome blocks using the calculated average, and determining whether the image is a color image or a monochrome image using a proportion of the color blocks. Accordingly, for a document wherein color and monochrome images are mixed, it is automatically determined whether an image is a color image or a monochrome image.

摘要翻译： 一种图像处理方法和使用该图像处理方法的图像形成装置。 处理方法包括将图像划分成预定数量的块，计算存在于划分的每个块中的像素的平均值，使用所计算的平均将块分类为彩色块和单色块，以及确定图像是否 是使用一定比例的色块的彩色图像或单色图像。 因此，对于混合彩色和单色图像的文档，自动确定图像是彩色图像还是单色图像。