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公开(公告)号：EP0491556A2
公开(公告)日：1992-06-24
申请号：EP91311717.2
申请日：1991-12-17
摘要： Method and apparatus for efficiently encoding image data of a color facsimile or the like are provided. A specific color judgment unit (4) discriminates a specific color portion such as white or blank portion of the image data inputted from an image input unit (1). An orthogonal transforming process (10) is not executed to the blank block, thereby raising an encoding efficiency. A discrimination signal is subjected to a dynamic arithmetical encoding (6), thereby producing code data.
摘要翻译： 提供了用于有效编码彩色传真等的图像数据的方法和装置。 特定颜色判断单元（4）区分从图像输入单元（1）输入的图像数据的特定颜色部分，例如白色或空白部分。 不对空白块执行正交变换处理（10），由此提高编码效率。 鉴别信号经过动态算术编码（6），由此产生码数据。
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公开(公告)号：EP0325372A3
公开(公告)日：1991-07-17
申请号：EP89300275.8
申请日：1989-01-12
申请人： AT&T Corp.
IPC分类号： H04N1/415
CPC分类号： H04N1/415
摘要： A high resolution image is decomposed into a low resolution replica and into corresponding supplemental information for facsimile transmission to a remote location. The low resolution replica is generated by replacing a super pixel (picture element) including a plurality of high resolution image pixels with a single low resolution pixel and corresponding supplemental information, if any is required. The pixels of the low resolution replica are chosen such that all supplemental information required to convert the low resolution replica back to the original high resolution image is located at the "edges" of the low resolution replica. Thus, if a low resolution pixel is at an edge in the low resolution replica, supplemental information is generated in accordance with prescribed criteria. In a remote receiver, the decomposition is reversed and the original high resolution image is recomposed by substituting the transmitted supplemental information, if any, for the corresponding low resolution pixels located at the edges of the low resolution replica.
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公开(公告)号：EP0396368A3
公开(公告)日：1991-05-15
申请号：EP90304677.9
申请日：1990-04-30
申请人： AT&T Corp.
CPC分类号： H04N1/4105 , H04N5/85 , H04N5/9261 , H04N19/102 , H04N19/13 , H04N19/61 , H04N19/63 , H04N19/94
摘要： An image-coding system reduces image data redundancies and perceptual irrelevancies through progressive sub-band coding. The image is separated into plurality of sub-bands ((0,0) to (3,3)). From this sub-band information, a perceptual metric, based on the properties of the sub-band filters, quantizer error distribution, and properties of the human visual system, is determined (28) which provides the maximum amount of coding noise that may be introduced to each pixel in every sub-band without causing perceptible degradation of the coded image. This perceptual metric is used to adjust the quantizer (25) used in encoding each sub-band signal. In addition, redundancy in the output of the quantizer is reduced using a multidimensional Huffman compression scheme (27).
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14.发明公开Method of distinguishing image area and non-image area, opaquing method and opaquing apparatus 失效分辨图像区域和非图像区域的方法，选择方法和选择装置
公开(公告)号：EP0374934A3
公开(公告)日：1990-08-01
申请号：EP89123720.8
申请日：1989-12-22
CPC分类号： H04N1/409 , H04N1/40093
摘要： A method of distinguishing non-image areas in the form of defects, stains or the like on a plate-making film or a photographic printing paper from an image area, a method of automatically performing an opaquing operation and an apparatus for carrying out the opaquing method are disclosed. An original image to be inspected is sequentially read from line to line by a scanning/reading device such as a line sensor or the like so that the non-image areas are distinguished from the image area in accordance with a so-called conjunction-method based on continuity of scanned pixels. The distinguished pixels are bundled and outputted to the opaquing apparatus. The opaquing apparatus is operated such that the non-image areas are stopped out in a stopping-out unit using a thermal trasfer tape on which thermally fusible material to be placed on the non-image areas is carried.
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15.发明授权Method and apparatus for message compression in a facsimile communication system 失效方法和装置在信息通信系统中的信息压缩
公开(公告)号：EP0199065B1
公开(公告)日：1990-06-13
申请号：EP86103439.5
申请日：1986-03-14
发明人： Toyokawa, Kazuharu
CPC分类号： H04N19/93
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16.发明公开Full page graphics image display data reduction 失效Bildanzeige von Ganzseiten-Graphiken的Datenverringerungfürdie。
公开(公告)号：EP0298446A2
公开(公告)日：1989-01-11
申请号：EP88110782.5
申请日：1988-07-06
发明人： Jackson, Brian H.
IPC分类号： H04N1/415
CPC分类号： H04N1/415
摘要： A program implemented method converts complex graphics and picture images in binary form into bit map representations which include only that image data which is essential for its reproduction by an output printer with limited buffer memory. The method includes the steps of storing a group of rows or block of the binary image data at a time in an input buffer, then analyzing a byte at a time, the row segment of image data thereby dividing the row segment into a number of cell matrices. Based upon the analysis of cell matrices, the method generates bit map representations describing only the essential or black data. Each bit map representation generated has a height corresponding to the number of horizontal scan lines and a length which corresponds to the number of consecutive cell matrices detected as containing black data. Only the essential image data contained in the generated bit map representations is transferred to an output buffer, along with generated horizontal and vertical positioning information, in addition to other parameter information required to reproduce the bit map representation. The above steps are repeated for each row segment or group of data defining each part of a page until the entire image has been processed.
摘要翻译： 程序实现的方法将二进制形式的复杂图形和图像图像转换成位图表示，其仅包括对具有有限缓冲存储器的输出打印机进行再现所必需的图像数据。 该方法包括以下步骤：一次在输入缓冲器中存储一组二进制图像数据的行或块，然后一次分析一个字节，从而将该图像数据的行段划分成多个单元 矩阵。 基于单元矩阵的分析，该方法生成仅描述基本或黑色数据的位图表示。 生成的每个位图表示具有对应于水平扫描行的数量的高度和对应于检测为包含黑色数据的连续小区矩阵的数量的长度。 除了生成位图表示所需的其他参数信息之外，只有包含在生成的位图表示中的基本图像数据与生成的水平和垂直定位信息一起被传送到输出缓冲器。 对于定义页面的每个部分的每个行段或数据组重复上述步骤，直到整个图像被处理。
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公开(公告)号：EP2725780B1
公开(公告)日：2018-07-04
申请号：EP13189429.7
申请日：2013-10-18
CPC分类号： H04N1/415 , H04N1/4105
摘要： Based on an m x n halftone matrix and an m x n pixel block of an image, an m x n halftone version of the m x n pixel block may be determined. An n-way interleave may be performed on rows of the m x n halftone version to create an mn x 1 halftone segment. The mn x 1 halftone segment may be compared to one or more halftone segments in a buffer. Based on the comparison, a literal code word and a representation of the mn x 1 halftone segment may be output, and the representation of the mn x 1 halftone segment may be written to the buffer. Alternatively, a repeat code word and a repeat value may be output, and at least one representation of the mn x 1 halftone segment may be written to the buffer.
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公开(公告)号：EP2583249A4
公开(公告)日：2016-07-27
申请号：EP10858467
申请日：2010-06-18
发明人： STRÖM JACOB , WENNERSTEN PER
CPC分类号： G09G5/00 , G06T9/00 , H04N1/64 , H04N19/105 , H04N19/14 , H04N19/176 , H04N19/184 , H04N19/186 , H04N19/42 , H04N19/90 , H04N19/94
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19.发明公开IMAGE OUTPUT SYSTEM FOR OUTPUTTING IMAGE BASED ON INFORMATION OF NUMBER OF DOTS TO BE FORMED IN PREDETERMINED AREA 审中-公开图像输出系统花费基于信息的图像中的预定区域LOWER点数
公开(公告)号：EP1722549A4
公开(公告)日：2007-04-18
申请号：EP05710373
申请日：2005-02-10
申请人： SEIKO EPSON CORP
发明人： KAKUTANI TOSHIAKI
CPC分类号： H04N1/4051 , B41J2/2128 , H04N1/4105 , H04N1/415
摘要： An image is divided into a plurality of pixel groups, each of which includes a predetermined number of adjacent pixels, and each pixel group gradation value representative of a respective pixel group is decided. Then, data of the number of the pixel groups is decided by referring to a conversion table in which combinations of the pixel group gradation values and the class numbers assigned to the respective pixel groups are associated with the data of the number of dots to be formed in the pixel groups. Then, the dots are formed by deciding those pixel positions for forming the dots the number of which is indicated in the number data, while referring to the pixel order representative of ease of forming the dots in the pixel groups. The number data can be quickly transferred/received since it includes no information of pixel positions and hence small in data amount. Additionally, the reference to the conversion table allows the number data to be quickly decided. Therefore, high-quality image data can be quickly outputted. Thus, there can be provided a technique for quickly outputting high-quality images through a simple process.
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20.发明公开METHOD AND APPARATUS FOR OPTIMIZED LOSSLESS COMPRESSION USING A PLURALITY OF CODERS 审中-公开方法和装置与多编码器优化损失地段压缩
公开(公告)号：EP1266455A1
公开(公告)日：2002-12-18
申请号：EP01912942.8
申请日：2001-02-22
CPC分类号： H03M7/30
摘要： A method of lossless compression of a stream of data first includes using a plurality of lossless coders to compress a test portion of the data stream (30). Once the test portion is compressed, the method determines a performance characteristic(s) associated with each of the lossless coders (32). Then the method selects one of the lossless coders based on the performance characteristic(s) and encodes a first portion of the data stream with the selected coder. Thereafter, the method includes repeating the using, determining, selecting and encoding steps for another test portion and a second portion of the data stream. Notably, the repeating step may include selecting a different one of the lossless coders.
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