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1. 发明授权

US4878125A Method and apparatus for image processing with fed-back error correction 失效
标题翻译：具有反馈误差校正的图像处理方法和装置
公开(公告)号：US4878125A
公开(公告)日：1989-10-31
申请号：US140029
申请日：1987-12-31
申请人： Akihiro Katayama , Hidefumi Ohsawa , Izuru Sunohara , Hiroshi Hosokawa , Masahiko Yoshimoto
发明人： Akihiro Katayama , Hidefumi Ohsawa , Izuru Sunohara , Hiroshi Hosokawa , Masahiko Yoshimoto
IPC分类号： G06T5/00 , H04N1/405 , H04N1/52 , H04N7/26
CPC分类号： H04N19/90 , G06T7/0083 , H04N1/4052 , H04N1/52 , G06T2207/10008
摘要： There is an image processing apparatus for digitally processing an image. This apparatus comprises: a binarization circuit to binarize image data by a predetermined threshold value; a processor to correct errors generated in binarization; a first detector to detect an edge direction of the image from the image data; and a second detector to detect an edge quantum of the image from the image data. The process corrects the error data in accordance with the edge direction detected by the first detector or the edge quantum detected by the second detector. The errors to be corrected by the processor are the errors between the output concentration data after the binarization and the image concentration data. The processor adds weight coefficients to the error data in a predetermined range stored in a memory and then adds the weighted error data to image data to be newly binarized. The sum of the weight coefficients which are used in the weighting process is set to "1". With this apparatus, a high quality apparatus can be reproduced with a high fidelity from an original including many edges.
摘要翻译：存在用于数字处理图像的图像处理装置。该装置包括：将图像数据二值化预定阈值的二值化电路; 处理器，用于校正二值化中产生的错误; 第一检测器，用于从图像数据检测图像的边缘方向; 以及第二检测器，用于从图像数据检测图像的边缘量子。该过程根据由第一检测器检测到的边缘方向或由第二检测器检测到的边缘量子来校正误差数据。处理器要纠正的错误是二值化后的输出浓度数据与图像浓度数据之间的误差。处理器将加权系数加到存储在存储器中的预定范围内的误差数据上，然后将加权的误差数据加到新二进制化的图像数据上。在加权处理中使用的加权系数的和被设置为“1”。利用该装置，可以从包括许多边缘的原稿以高保真度再现高质量的装置。

2. 发明授权

US5068746A Image processing apparatus 失效
公开(公告)号：US5068746A
公开(公告)日：1991-11-26
申请号：US394865
申请日：1989-08-17
申请人： Hidefumi Ohsawa , Akihiro Katayama , Hiroshi Hosokawa , Izuru Sunohara , Masahiko Yoshimoto
发明人： Hidefumi Ohsawa , Akihiro Katayama , Hiroshi Hosokawa , Izuru Sunohara , Masahiko Yoshimoto
IPC分类号： G06K9/38 , H04N1/405 , H04N1/52
CPC分类号： H04N1/52 , G06K9/38 , H04N1/4052 , G06K2209/01
摘要： An image processing apparatus for digitizing an analog image by dispersing the digitizing error to the surrounding areas. The characteristics or edge of the analog imnage are identified, and the error dispersing area is varied according to the result of identification, thus enabling reproduction of the image with high quality regardless of the nature of the original image.

3. 发明授权

US4876610A Image processing apparatus with binarization-error dispersal 失效
标题翻译：具有二值化误差分散的图像处理装置
公开(公告)号：US4876610A
公开(公告)日：1989-10-24
申请号：US137439
申请日：1987-12-23
申请人： Hidefumi Ohsawa , Akihiro Katayama , Hiroshi Hosokawa , Izuru Sunohara , Masahiko Yoshimoto
发明人： Hidefumi Ohsawa , Akihiro Katayama , Hiroshi Hosokawa , Izuru Sunohara , Masahiko Yoshimoto
IPC分类号： G06K9/38 , H04N1/405 , H04N1/52
CPC分类号： H04N1/52 , G06K9/38 , H04N1/4052 , G06K2209/01
摘要： An image processing apparatus for digitizing an analog image by dispersing the digitizing error to the surrounding areas. The characteristics or edge of the analog image are identified, and the error dispersing area is varied according to the result of identification, thus enabling reproduction of the image with high quality regardless of the nature of the original image.
摘要翻译：一种图像处理装置，用于通过将数字化误差分散到周围区域来数字化模拟图像。识别模拟图像的特征或边缘，并且根据识别结果改变误差分散区域，从而能够以高质量再现图像，而与原始图像的性质无关。

4. 发明授权

US5282256A Binary image data coding method having the function of correcting errors derived from coding 失效
标题翻译：具有校正从编码导出的错误的功能的二进制图像数据编码方法
公开(公告)号：US5282256A
公开(公告)日：1994-01-25
申请号：US900761
申请日：1992-06-19
申请人： Hidefumi Ohsawa , Akihiro Katayama
发明人： Hidefumi Ohsawa , Akihiro Katayama
IPC分类号： G06T9/00 , H04N1/41 , G06K9/36
CPC分类号： G06T9/004 , H04N1/4105
摘要： An image data coding method for a case where image data are transmitted or filed upon being binary coded includes steps of replacing a predetermined pixel by a predicted value predicted by a plurality of pixels peripheral to the predetermined pixel, in conformance with a coded image data compression technique, and performing binary coding while dispersing an error, which is generated by the replacement, among peripheral pixels. Also provided are a variety of image data coding apparatus for practicing this image data coding method. The invention makes it possible to perform binary coding and compression of half-tone image data very efficiently.
摘要翻译：图像数据编码方法，用于在二进制编码时发送或归档图像数据的情况，包括以下步骤：根据编码图像数据压缩将预定像素替换为由预定像素周围的多个像素预测的预测值技术，并且在周边像素之间分散由替换产生的错误的同时执行二进制编码。还提供了用于实施该图像数据编码方法的各种图像数据编码装置。本发明使得可以非常有效地执行半色调图像数据的二进制编码和压缩。

5. 发明授权

US4975786A Image processing method and apparatus with error diffusion capability 失效
标题翻译：具有误差扩散能力的图像处理方法和装置
公开(公告)号：US4975786A
公开(公告)日：1990-12-04
申请号：US289017
申请日：1988-12-23
申请人： Akihiro Katayama , Hidefumi Ohsawa , Shinichi Ishida , Masahiro Sakamoto , Yasuyuki Shinada
发明人： Akihiro Katayama , Hidefumi Ohsawa , Shinichi Ishida , Masahiro Sakamoto , Yasuyuki Shinada
IPC分类号： H04N1/405
CPC分类号： H04N1/4052
摘要： An image processing apparatus such as a digital printer or digital facsimile apparatus for half tone processing input image data has: an input device to input image data indicative of a concentration of an image; a discriminating circuit to discriminate whether the input image data is smaller than a threshold value or not; a binarizing circuit to binarize the input image data into binary data of high and low levels; and a setting circuit to set the binary output of the image data to the low (0) level irrespective of the result of the binarization by the binarizing circuit when the input image data is determined to be smaller than the threshold value. The input device includes a reading circuit to read the original image and a generator to generate image data indicative of the original image concentration. When the pixel concentration to be processed by an error diffusion method is smaller than the threshold value, the error data generated for that pixel is set to 0, with the result that particles-like noises in the high contrast portion are eliminated and the encoding efficiency in highlight portions is improved. Thus, a high quality image of excellent resolution and gradations can be transmitted at a high speed.
摘要翻译：用于半色调处理输入图像数据的诸如数字打印机或数字传真装置的图像处理装置具有：输入指示图像浓度的图像数据的输入装置; 识别电路，用于识别输入图像数据是否小于阈值; 二进制化电路，将输入图像数据二值化为高，低电平的二进制数据; 以及设置电路，用于当输入图像数据被确定为小于阈值时，将图像数据的二进制输出设置为低（0）电平，而不考虑二值化电路的二值化结果。输入装置包括读取原始图像的读取电路和发生器，以产生指示原始图像浓度的图像数据。当通过误差扩散方法处理的像素浓度小于阈值时，为该像素生成的误差数据被设置为0，结果是高对比度部分中的颗粒状噪声被消除，并且编码效率亮点部分得到改善。因此，可以高速地传输优异的分辨率和灰度的高质量图像。

6. 发明授权

US5325448A Image treatment method and apparatus with error dispersion and controllable quantization 失效
标题翻译：具有误差色散和可控量子化的图像处理方法和装置
公开(公告)号：US5325448A
公开(公告)日：1994-06-28
申请号：US875210
申请日：1992-04-28
申请人： Akihiro Katayama , Hidefumi Ohsawa , Akiko Fukuhara
发明人： Akihiro Katayama , Hidefumi Ohsawa , Akiko Fukuhara
IPC分类号： H04N1/405 , G06K9/38
CPC分类号： H04N1/4053
摘要： An image treatment apparatus comprising: an input device for inputting image data; a setting circuit serving as a reference when the image data is quantized in accordance with the image data input by the input device; a quantizing circuit for quantizing the image data; and a device for outputting an image in accordance with the result of treatment performed by the quantizing circuit, wherein the quantizing circuit performs the quantization by correcting the error between the image data input by the input device and the image output by the outputting device.
摘要翻译：一种图像处理装置，包括：输入装置，用于输入图像数据; 当根据由输入装置输入的图像数据量化图像数据时，设置电路作为参考; 用于量化图像数据的量化电路; 以及根据由量化电路执行的处理结果输出图像的装置，其中量化电路通过校正由输入装置输入的图像数据与输出装置输出的图像之间的误差来执行量化。

7. 发明授权

US4958238A Image processing method and apparatus with conditional correction of error data 失效
标题翻译：具有错误数据条件校正的图像处理方法和装置
公开(公告)号：US4958238A
公开(公告)日：1990-09-18
申请号：US319057
申请日：1989-03-06
申请人： Akihiro Katayama , Hidefumi Ohsawa
发明人： Akihiro Katayama , Hidefumi Ohsawa
IPC分类号： G06T5/00 , H04N1/405 , H04N1/409
CPC分类号： H04N1/4052
摘要： There is provided an image processing apparatus which handles an image as a digital signal, comprising: an input device to input image data indicative of a concentration of an image; a binarization circuit to binarize the input image data; a positive/negative state detection circuit to detect whether error data generated when the image data is binarized by the binarization circuit is in a positive state or a negative state; and a selector to select whether the error data generated upon binarization is to be corrected or not, on the basis of the positive or negative state of the error data. The input device has a generator to read an original and generate an analog image signal and a converter to convert the analog image signal into the digital image data. The error data is the difference between the input image data and the binary data produced by the binarization circuit. With this apparatus, an image of a good picture quality can be obtained by improving the error diffusion method as a halftone processing method. Even when portions of high and low concentrations in an original are very close to each other, the blanking phenomenon, wherein no dot is printed in the low concentration area near the boundary between those portions, and the consequent problem that the reproduced image lacks its proper content can be prevented.
摘要翻译：提供一种处理图像作为数字信号的图像处理装置，包括：输入装置，输入指示图像浓度的图像数据; 二值化电路，用于二值化输入图像数据; 正/负状态检测电路，用于检测由二值化电路将图像数据二值化时产生的误差数据为正状态还是负状态; 以及选择器，其基于错误数据的正或负状态来选择是否要校正在二值化时生成的错误数据。输入装置具有用于读取原稿并产生模拟图像信号的发生器和将模拟图像信号转换为数字图像数据的转换器。误差数据是输入图像数据与二值化电路产生的二进制数据之间的差异。利用该装置，通过改进作为半色调处理方法的误差扩散方法，可以获得良好图像质量的图像。即使在原稿中的高浓度和低浓度的部分彼此非常接近的情况下，在这些部分之间的边界附近的低浓度区域中没有点印刷的消隐现象，以及再现的图像缺乏适当的问题可以防止内容。

8. 发明授权

US06285464B1 Apparatus and method for producing a half-tone image 失效
标题翻译：用于产生半色调图像的装置和方法
公开(公告)号：US06285464B1
公开(公告)日：2001-09-04
申请号：US07957825
申请日：1992-10-08
申请人： Akihiro Katayama , Hidefumi Ohsawa , Akiko Fukuhara
发明人： Akihiro Katayama , Hidefumi Ohsawa , Akiko Fukuhara
IPC分类号： H04N121
CPC分类号： H04N1/4053
摘要： A half-tone image is produced by scanning a plurality of input points of an original, outputting a screened image having a plurality of black and white dots and transmitting signals representing the screened image to a marking device. The size of each plurality of dots is determined from a recursive relationship between a value of a current input point, a previous output and an error representing a difference between a value of a previous input point and the previous output.
摘要翻译：通过扫描原稿的多个输入点，输出具有多个黑白点的屏蔽图像并将表示屏蔽图像的信号发送到标记装置来产生半色调图像。根据当前输入点的值，先前输出和表示先前输入点的值与先前输出之间的差异的误差之间的递归关系来确定每个多个点的大小。

9. 发明授权

US5008950A Image processing method and apparatus for error-dispersion digitization without moire or spurious stripe formation 失效
标题翻译：用于误差分散数字化的图像处理方法和装置，无莫尔条纹或伪条纹形成
公开(公告)号：US5008950A
公开(公告)日：1991-04-16
申请号：US145593
申请日：1988-01-19
申请人： Akihiro Katayama , Hidefumi Ohsawa
发明人： Akihiro Katayama , Hidefumi Ohsawa
IPC分类号： H04N1/405
CPC分类号： H04N1/4052
摘要： There is provided an improvement on the error dispersion method for binary digitizing of an image, in which an area of plural pixels is digitzed, and the error into the digitizing is dispersed in a neighboring area of plural pixels. In the latter area the digitization is conducted according to the image data of plural pixels and the error data dispersed into this area.
摘要翻译：提供了对于其中多个像素的区域被数字化的图像的二进制数字化的误差色散方法的改进，并且将数字化的误差分散在多个像素的相邻区域中。在后一个区域，根据多个像素的图像数据和分散在该区域中的误差数据进行数字化。

10. 发明授权

US4958218A Image processing method and apparatus with dot-processing 失效
标题翻译：具有点处理的图像处理方法和装置
公开(公告)号：US4958218A
公开(公告)日：1990-09-18
申请号：US284603
申请日：1988-12-15
申请人： Akihiro Katayama , Hidefumi Ohsawa
发明人： Akihiro Katayama , Hidefumi Ohsawa
IPC分类号： H04N1/405 , H04N1/52 , H04N1/58
CPC分类号： H04N1/58 , H04N1/4052 , H04N1/52
摘要： There are provided an image processing method and apparatus for processing an image by digital signals and for reproducing the image with a high picture quality. The apparatus comprises: an input device to input a plurality of color image data; a first processor to perform a dotting process on the color image data input by the input device; and a second processor to digitize the color image data dot-processed by the first processor, wherein the first processor changes the dotting process for each of the color image data. With the apparatus, first and second features of the input image are detected and different dotting processes are executed in accordance with the first and second features, so that the image process can be executed at a high speed and a color image having excellent gradations and resolution can be obtained while suppressing the occurrence of a color moire.
摘要翻译：提供了一种用于通过数字信号处理图像并且以高图像质量再现图像的图像处理方法和装置。该装置包括：输入装置，用于输入多个彩色图像数据; 对由所述输入装置输入的彩色图像数据进行点划线处理的第一处理器; 以及第二处理器，用于对由第一处理器进行点处理的彩色图像数据进行数字化，其中第一处理器改变每个彩色图像数据的点划线处理。利用该装置，检测输入图像的第一和第二特征，并根据第一和第二特征执行不同的点划线处理，使得可以高速执行图像处理，并且具有优异的灰度和分辨率的彩色图像可以在抑制彩色莫尔的出现的同时获得。

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