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公开(公告)号：EP0448802A3
公开(公告)日：1992-01-08
申请号：EP90124057.2
申请日：1990-12-13
IPC分类号： H03M7/40
CPC分类号： H03M7/4006 , H03M7/48
摘要： A system and method for maximizing data compression by optimizing model selection during coding of an input stream of data symbols, wherein at least two models are run and compared, and the model with the best coding performance for a given-size segment or block of compressed data is selected such that only its block is used in an output data stream. The best performance is determined by 1) respectively producing comparable-size blocks of compressed data from the input stream with the use of the two, or more, models and 2) selecting the model which compresses the most input data. In the preferred embodiment, respective strings of data are produced with each model from the symbol data and are coded with an adaptive arithmetic coder into the compressed data. Each block of compressed data is started by coding the decision to use the model currently being run and all models start with the arithmetic coder parameters established at the end of the preceding block. Only the compressed code stream of the best model is used in the output and that code stream has in it the overhead for selection of that model. Since the decision as to which model to run is made in the compressed data domain, i.e., the best model is chosen on the basis of which model coded the most input symbols for a given-size compressed block, rather than after coding a given number of input symbols, the model selection decision overhead scales with the compressed data. Successively selected compressed blocks are combined as an output code stream to produce an optimum output of compressed data, from input symbols, for storage or transmission.
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公开(公告)号：EP0109005B1
公开(公告)日：1987-06-10
申请号：EP83110955.8
申请日：1983-11-03
IPC分类号： H04N1/40
CPC分类号： H04N1/4056 , H04N1/4055
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公开(公告)号：EP0142767A2
公开(公告)日：1985-05-29
申请号：EP84113330.9
申请日：1984-11-06
CPC分类号： G06T3/403 , H04N1/40068 , H04N1/41
摘要： Data compression, resolution and coding efficiency of graphic text or line image data is achieved by eliminating transitions between gray levels at edges in an image, converting all gray levels to a common value to achieve a 3 level representation of the image, and reversibly converting the 3 level representation to a bilevel double resolution representation by increasing the data sampling rate and therefore allowing the use of two level data compression techniques. A high resoluton display or printed output may be obtained from the bilevel multiresolution representation.
摘要翻译： 图形文字或行图像数据的数据压缩，分辨率和编码效率通过消除图像边缘灰度级之间的转换，将所有灰度级转换为公共值来实现图像的3级表示，并可逆地转换 通过增加数据采样率，从而允许使用两级数据压缩技术，将3级表示为双层分辨率表示。 可以从双层多分辨率表示中获得高分辨率显示或打印输出，
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公开(公告)号：EP0095560A2
公开(公告)日：1983-12-07
申请号：EP83102118.3
申请日：1983-03-04
IPC分类号： H04N7/13
摘要： in an image processing system, a method is shown for efficiently transmitting data representing picutre information in fields subsequent to a first field and for suppressing motion induced flicker in the processed image. Using previously processed first field data which is used to predict values for picture elements in subsequent fields, a gradient value is calculated which indicates relative picture activity. A difference value for the picture elements in the subsequent fields is calculated and is limited in magnitude by the gradient value for each picture element. The limited difference value is encoded as a function of previous difference value and transmitted to a remote location for decoding and picture reconstruction and display.
摘要翻译： 在图像处理系统中，示出了用于在第一场之后的场中有效地发送表示图像信息的数据并且用于抑制经处理的图像中的运动引起的闪烁的方法。 使用用于预测后续字段中的图像元素的先前处理的第一场数据，计算指示相对图像活动的梯度值。 计算后续字段中的图像元素的差值，并且在幅度上限制每个图像元素的梯度值。 有限差分值被编码为先前差值的函数，并被发送到远程位置用于解码和图像重建和显示。
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公开(公告)号：EP0012860B1
公开(公告)日：1983-05-25
申请号：EP79104720.2
申请日：1979-11-27
CPC分类号： B41J25/006 , B41J2/425
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公开(公告)号：EP0055329A1
公开(公告)日：1982-07-07
申请号：EP81107579.5
申请日：1981-09-23
IPC分类号： B41J9/40
CPC分类号： B41J9/40
摘要： An impact printing mechanism has an electrostatic clutch assembly, including a rotatably mounted semiconductive coated drum (10) and a conductive band (12) wrapped around the circumference thereof. The printing mechanism includes a printing hammer (32) and a print spring (48) for actuating the printing hammer. When a print command is issued, a voltage is applied to the band (12) to create a field between the band and the drum coating. An electrostatic force is thereby generated and when the drum is rotating slowly or synchronous with drum step motion, that motion will pull the band, pivot the hammer and compress the print spring. The potential energy stored in the spring is then ready to fire the hammer. A hammer firing command turns off the voltage pulse and discharges the field, releasing the electrostatic holding force instantaneously and firing the hammer by the compressed spring.
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8.发明公开System and method for suppressing blocking artifacts in decoded transform coded images 失效System and Verfahren zurUnterdrückungder Blockstrukturen in dekodierten transformationationskodierten Bildern。
公开(公告)号：EP0585573A2
公开(公告)日：1994-03-09
申请号：EP93111201.5
申请日：1993-07-13
摘要： A system and method for image processing is disclosed wherein blocking artifacts are decreased or removed in regions of slowly varying intensity, i.e., low activity, in an image reproduction decoded from a transform coded image representation. The de-blocking procedure may be applied to JPEG DCT-based decoded images, and AC prediction is done selectively only in regions of low activity and only if the AC prediction is consistent with known decoded AC coefficient values of lower precision than the predicted values.
摘要翻译： 公开了一种用于图像处理的系统和方法，其中在从变换编码图像表示解码的图像再现中，在缓慢变化的强度（即，低活动性）的区域中减少或去除块伪影。 解块过程可以应用于基于JPEG DCT的解码图像，并且AC预测仅在低活动性的区域中进行，并且仅当AC预测与比预测值更低精度的已知解码的AC系数值一致时才完成。
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公开(公告)号：EP0225488B1
公开(公告)日：1994-02-16
申请号：EP86115454.0
申请日：1986-11-07
CPC分类号： G06F7/5235 , G06F1/0307 , G06F7/4833 , H03M7/4006
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公开(公告)号：EP0142767B1
公开(公告)日：1991-01-16
申请号：EP84113330.9
申请日：1984-11-06
CPC分类号： G06T3/403 , H04N1/40068 , H04N1/41
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