公开(公告)号：US20060209346A1

公开(公告)日：2006-09-21

申请号：US11082046

申请日：2005-03-17

申请人： Nobuhiko Nakahara

发明人： Nobuhiko Nakahara

IPC分类号： G06F15/00

CPC分类号： H04N1/40062 ,  H04N1/4057 ,  H04N1/4105

摘要： A halftoning process section in an image processing apparatus includes a process switching section that switches a process of a signal from a color conversion process section. The process switching section executes switching in accordance with input tag data. In the case of a text, a text halftoning process section executes a halftoning process. In the case of graphics, a bit number increasing section increases a bit number for graphics, and a graphics halftoning process section executes a halftoning process. In the case of a photo, a bit number increasing section increases a bit number for a photo, and a photo halftoning process section executes a halftoning process.

公开(公告)号：US06996282B1

公开(公告)日：2006-02-07

申请号：US09586205

申请日：2000-06-02

申请人： Tetsujiro Kondo ,  Hiroshi Ichiki ,  Kenji Tanaka

发明人： Tetsujiro Kondo ,  Hiroshi Ichiki ,  Kenji Tanaka

IPC分类号： G06K9/36

CPC分类号： H04N1/4105 ,  H04N19/124 ,  H04N19/132 ,  H04N19/154 ,  H04N19/156 ,  H04N19/162 ,  H04N19/164 ,  H04N19/182 ,  H04N19/184 ,  H04N19/46 ,  H04N19/59 ,  H04N19/89 ,  H04N19/90

摘要： Corresponding to the compared results of threshold values of uniformly random numbers supplied from a uniformly random number generator and pixel values of an original picture signal, each pixel value of the original picture signal is encoded. The resultant encoded picture signal is transmitted. When a decoding apparatus receives transmission data, the decoding apparatus cumulates encoded values of the transmission data for each pixel value, counts the number of cumulation times, and decodes the cumulated encoded values for each pixel value of the original picture signal corresponding to the number of cumulation times.

摘要翻译： 对应于从均匀随机数发生器提供的均匀随机数的阈值和原始图像信号的像素值的比较结果的比较结果，对原始图像信号的每个像素值进行编码。 发送所得到的编码图像信号。 当解码装置接收到发送数据时，解码装置对每个像素值累计发送数据的编码值，对累积次数进行计数，并对与该数字对应的原始图像信号的每个像素值的累积编码值进行解码 累积次数

公开(公告)号：US06449393B1

公开(公告)日：2002-09-10

申请号：US09249729

申请日：1999-02-11

申请人： Michael Alan Peters

发明人： Michael Alan Peters

IPC分类号： G06K936

CPC分类号： H04N1/4105 ,  G06T9/007 ,  H04N1/41

摘要： A method and apparatus for compression of data. The invention provides for the application of a plurality of compression schemes to the data such that improved compression ratios are achieved. A first embodiment provides for compression of each pixel by one of a plurality of different entropy-based compression schemes based upon a probability cost analysis. A second embodiment provides for compression of each pixel based on a hybrid context formed using a plurality of compression schemes for improved probability determination, and thus improved entropy encoding. In embodiments of the invention, a context compression scheme similar to JBIG is applied, as well as an inverse scheme. The context scheme forms a statistical context from a concatenated sequence of previous pixel values. The inverse scheme provides a gray value estimation method based upon previous pixel values and respective threshold values. Statistics are maintained with respect to the actual current pixel value and the difference between an estimated gray value and the current pixel threshold value.

摘要翻译： 一种压缩数据的方法和装置。 本发明提供了将多种压缩方案应用于数据，从而实现了改进的压缩比。 第一实施例提供了基于概率成本分析的多个不同基于熵的压缩方案中的一个压缩每个像素。 第二实施例提供了基于使用多个压缩方案形成的用于改进的概率确定的混合上下文来压缩每个像素，从而改进了熵编码。 在本发明的实施例中，应用类似于JBIG的上下文压缩方案以及逆方案。 上下文方案从先前像素值的级联序列形成统计上下文。 逆方案提供了基于先前像素值和相应阈值的灰度估计方法。 相对于实际当前像素值和估计灰度值与当前像素阈值之间的差异来维持统计。

公开(公告)号：US06201614B1

公开(公告)日：2001-03-13

申请号：US09220324

申请日：1998-12-24

申请人： Frederick Lin

发明人： Frederick Lin

IPC分类号： H04N1405

CPC分类号： H04N1/4105 ,  H04N1/40075

摘要： A dithered image compression system that converts a source image into an image that is efficiently compressed and yet preserves the visual image information of the original source image in a computer environment. A preferred embodiment of the invention removes the image data from the source image that are lost during the normal storage and halftoning stages in one step. Each pixel in the source image is compared to the threshold array values. If the value of the source image pixel is less than the corresponding threshold array pixel, then a zero is placed in that position in the dithered image array, otherwise a one is placed in the dithered image array. The dithered image array is then compared with the threshold array, thereby creating a range array where the range of each pixel is determined using the dithered image array values combined with the threshold array values. A value selection is then made from the range array to create a derived image array where one value is selected from the range that has been established for each pixel. The actual value selected depends on the desired print quality and/or compression ratio. The result is an image that is much simpler than the source image and can be compressed without any further loss of information because the amount of data known to be lost has been removed. The derived image will produce the same dithered image using the same threshold array as the original source image in the halftone process.

摘要翻译： 一种抖动图像压缩系统，其将源图像转换为有效压缩的图像，并且在计算机环境中保留原始源图像的可视图像信息。 本发明的优选实施例从一个步骤的正常存储和半色调阶段中消除了源图像中丢失的图像数据。 将源图像中的每个像素与阈值数组值进行比较。 如果源图像像素的值小于对应的阈值阵列像素，则在抖动图像阵列中将零置于该位置，否则将其放置在抖动图像阵列中。 然后将抖动图像阵列与阈值阵列进行比较，由此创建范围阵列，其中使用与阈值阵列值组合的抖动图像阵列值来确定每个像素的范围。 然后从范围数组中进行值选择，以创建从已为每个像素建立的范围中选择一个值的导出图像数组。 选择的实际值取决于所需的打印质量和/或压缩比。 结果是比源图像简单得多的图像，并且可以被压缩而没有任何进一步的信息丢失，因为已知的丢失的数据量被去除。 导出的图像将使用与半色调处理中的原始源图像相同的阈值阵列产生相同的抖动图像。

公开(公告)号：US6154568A

公开(公告)日：2000-11-28

申请号：US867394

申请日：1997-06-02

申请人： Liming Chen ,  Osamu Asada

发明人： Liming Chen ,  Osamu Asada

IPC分类号： H04N1/387 ,  G06T3/40 ,  G06T5/00 ,  H04N1/40 ,  H04N1/405 ,  H04N1/41 ,  H04N1/411 ,  G06K9/32

CPC分类号： G06T3/4007 ,  H04N1/40068 ,  H04N1/4105

摘要： A bi-level image is pre-processed by dividing the image into rectangular blocks, and rearranging the dots in each rectangular block into a pattern determined by the density of black dots in the block. The resulting rearranged image is suitable for further processing such as resolution conversion or compressive encoding.

摘要翻译： 通过将图像划分成矩形块并将每个矩形块中的点重新排列成由块中的黑点的密度确定的图案来预先处理双层图像。 所产生的重新排列的图像适用于诸如分辨率转换或压缩编码之类的进一步处理。

公开(公告)号：US5778159A

公开(公告)日：1998-07-07

申请号：US285528

申请日：1994-08-04

申请人： Nobuyasu Ito

发明人： Nobuyasu Ito

IPC分类号： B41J2/47 ,  B41J2/52 ,  G06F3/12 ,  G06K15/02 ,  G06T5/00 ,  H04N1/405 ,  H04N1/41 ,  G06K15/00 ,  H04N1/21 ,  H04N1/40

CPC分类号： G06K15/02 ,  B41J2/471 ,  B41J2/52 ,  H04N1/4105 ,  G06K2215/0094

摘要： In an outputting method and apparatus for use with a laser beam printer or the like which handles binary data or multivalue data and can express a density of a half, the capacity of a memory provided in the printer is detected and the gradation number of multivalue image data is changed or reduced in a smaller gradation number, e.g., binary data, in accordance with the memory capacity. A part of the input multivalue image data is set in white or black binary data values. Thus, an image of a high quality can be promptly generated with high precision, and the data amount to be processed can be reduced.

摘要翻译： 在与处理二进制数据或多值数据并且可以表示一半密度的激光束打印机等一起使用的输出方法和装置中，检测在打印机中提供的存储器的容量，并且多值图像的灰度数 根据存储器容量，数据以较小的等级数（例如二进制数据）被改变或减少。 输入多值图像数据的一部分被设置为白色或黑色二进制数据值。 因此，可以高精度地迅速地产生高质量的图像，并且可以减少要处理的数据量。

公开(公告)号：US5726772A

公开(公告)日：1998-03-10

申请号：US540038

申请日：1995-10-06

申请人： Kevin J. Parker ,  Theophano Mitsa

发明人： Kevin J. Parker ,  Theophano Mitsa

IPC分类号： H04N1/52 ,  G06T3/40 ,  H04N1/40 ,  H04N1/405 ,  H04N1/41

CPC分类号： H04N1/40075 ,  G06T3/40 ,  G06T3/4084 ,  H04N1/4051 ,  H04N1/4105

摘要： A method of and system for rendering a halftone image of a gray scale image by utilizing a pixel-by-pixel comparison of the gray scale image against a blue noise mask is disclosed in which the gray scale image is scanned on a pixel-by-pixel basis and compared on a pixel-by-pixel basis to an array of corresponding data points contained in a blue noise mask stored in a PROM or computer memory in order to produce the desired halftoned image. Both digital and optically implemented halftone methods are disclosed. Application specific modifications of the blue noise mask as well as its use for producing halftoned color images are also disclosed.

公开(公告)号：US5708518A

公开(公告)日：1998-01-13

申请号：US420155

申请日：1995-04-11

申请人： Kevin J. Parker ,  Theophano Mitsa

发明人： Kevin J. Parker ,  Theophano Mitsa

IPC分类号： H04N1/52 ,  G06T3/40 ,  H04N1/40 ,  H04N1/405 ,  H04N1/41

CPC分类号： H04N1/40075 ,  G06T3/40 ,  G06T3/4084 ,  H04N1/4051 ,  H04N1/4105

摘要： A method of and system for rendering a halftone image of a gray scale image by utilizing a pixel-by-pixel comparison of the gray scale image against a blue noise mask is disclosed in which the gray scale image is scanned on a pixel-by-pixel basis and compared on a pixel-by-pixel basis to an array of corresponding data points contained in a blue noise mask stored in a PROM or computer memory in order to produce the desired halftoned image. Both digital and optically implemented halftone methods are disclosed. Application specific modifications of the blue noise mask as well as its use for producing halftoned color images are also disclosed.

公开(公告)号：US5621826A

公开(公告)日：1997-04-15

申请号：US444770

申请日：1995-05-19

申请人： Akihiro Katayama ,  Mitsuru Maeda ,  Yasuji Hirabayashi ,  Tadashi Yoshida

发明人： Akihiro Katayama ,  Mitsuru Maeda ,  Yasuji Hirabayashi ,  Tadashi Yoshida

IPC分类号： H04N1/40 ,  H04N1/409 ,  H04N1/41 ,  H04N1/417 ,  G06K9/42

CPC分类号： H04N1/4172 ,  H04N1/40062 ,  H04N1/40068 ,  H04N1/409 ,  H04N1/4105

摘要： An image reduction apparatus includes a smoothing unit for smoothing binary image data, a binarization unit for binarizing an output from the smoothing unit, a detection unit for detecting an attribute of the binary image data smoothed by the smoothing unit, a plurality of correction units corresponding to a plurality of attributes, and a selector for selecting one of the correction units in accordance with the attribute detected by the detection unit. An output from the binarization unit is corrected by the correction unit selected by the selector.

摘要翻译： 图像缩小装置包括用于平滑二进制图像数据的平滑单元，用于对来自平滑单元的输出进行二值化的二值化单元，用于检测由平滑单元平滑化的二值图像数据的属性的检测单元，对应于多个校正单元 多个属性，以及选择器，用于根据由检测单元检测的属性来选择一个校正单元。 来自二值化单元的输出由选择器选择的校正单元校正。

公开(公告)号：US5477305A

公开(公告)日：1995-12-19

申请号：US345788

申请日：1994-11-22

申请人： Kevin J. Parker ,  Theophano Mitsa

发明人： Kevin J. Parker ,  Theophano Mitsa

IPC分类号： H04N1/52 ,  G06T3/40 ,  H04N1/40 ,  H04N1/405 ,  H04N1/41 ,  H04N1/46

CPC分类号： H04N1/40075 ,  G06T3/40 ,  G06T3/4084 ,  H04N1/4051 ,  H04N1/4105

摘要： A method of and system for rendering a halftone image of a gray scale image by utilizing a pixel-by-pixel comparison of the gray scale image against a blue noise mask is disclosed in which the gray scale image is scanned on a pixel-by-pixel basis and compared on a pixel-by-pixel basis to an array of corresponding data points contained in a blue noise mask stored in a PROM or computer memory in order to produce the desired halftoned image. Both digital and optically implemented halftone methods are disclosed. Application specific modifications of the blue noise mask as well as its use for producing halftoned color images are also disclosed.

摘要翻译： 公开了通过利用灰度图像与蓝色噪声掩模的逐像素比较来渲染灰度图像的半色调图像的方法和系统，其中灰度图像被逐个扫描， 像素为基础，并且在逐个像素的基础上与包含在存储在PROM或计算机存储器中的蓝色噪声掩码中的对应数据点的阵列进行比较，以便产生所需的半色调图像。 公开了数字和光学实现的半色调方法。 还公开了蓝色噪声掩模的特定应用以及其用于产生半色调彩色图像的应用。