公开(公告)号：US4215375A

公开(公告)日：1980-07-29

申请号：US14508

申请日：1979-02-23

申请人： Touru Usubuchi ,  Kazumoto Iinuma

发明人： Touru Usubuchi ,  Kazumoto Iinuma

IPC分类号： H04N1/41 ,  H04N1/417 ,  H04N1/00

CPC分类号： H04N1/4105 ,  H04N1/417

摘要： A digital facsimile system suitable for the facsimile transmission of newspaper pages having screened picture portions and printed character portions is disclosed. The transmitter receives a digitized facsimile signal which is a train of pel codes formed by scanning a picture to be transmitted. In response to the digitized facsimile signal, a first reference generator produces first pel codes neighboring the present pel code, a second pel code spaced by the pitch of the screened picture from the present pel code, and third pel codes neighboring the second pel code. A ROM is addressed by the first, second and third pel codes to produce a first prediction code for the present pel code. The output of the ROM and the digitized facsimile signal are supplied to an Exclusive OR which provides a prediction error code according to the difference between the first prediction code and the present pel code. A train of prediction errors codes constitutes a prediction error signal which is encoded and transmitted. The receiver receives the encoded prediction error signal and decodes it to reproduce the prediction error signal. Another Exclusive OR produces the present pel code from each error code of the prediction error signal. A second reference code generator produces a second reference code corresponding to the first reference code on the basis of the output of the second Exclusive OR. A second ROM produces a second prediction code corresponding to the first prediction code on the basis of the second reference code and applies the second prediction code to the second Exclusive OR.

摘要翻译： 公开了适用于具有筛选图像部分和打印字符部分的报纸的传真传输的数字传真系统。 发射机接收数字化的传真信号，该数字化的传真信号是通过扫描待传输的图像而形成的一系列像素码。 响应于数字化传真信号，第一参考生成器产生与当前像素码相邻的第一像素码，与当前像素码间隔的屏蔽图像间距的第二像素码以及与第二像素码相邻的第三像素码。 ROM由第一，第二和第三像素码寻址以产生用于当前像素码的第一预测码。 ROM和数字化传真信号的输出被提供给异或，其根据第一预测码和当前像素码之间的差提供预测误差码。 一串预测误差代码构成编码和发送的预测误差信号。 接收机接收编码的预测误差信号，对其进行解码以再现预测误差信号。 另一个异或产生来自预测误差信号的每个错误码的当前像素码。 第二参考码发生器基于第二异或的输出产生对应于第一参考码的第二参考码。 第二ROM基于第二参考码产生对应于第一预测码的第二预测码，并将第二预测码应用于第二异或。

公开(公告)号：US4633325A

公开(公告)日：1986-12-30

申请号：US646539

申请日：1984-09-04

申请人： Touru Usubuchi

发明人： Touru Usubuchi

IPC分类号： G06T9/00 ,  H04N1/41 ,  H04N7/26 ,  H04N1/00 ,  H04N7/12

CPC分类号： H04N19/90 ,  G06T9/004

摘要： An adaptive predictive encoding apparatus generates predictive values P.sub.1, P.sub.2, . . . , P.sub.n with respect to a quantized value X of a picture element x. Predictive error signals Y.sub.1, Y.sub.2, . . . , Y.sub.n are obtained from the quantized value X and the predictive values P.sub.1, P.sub.2, . . . , P.sub.n. A prediction selection circuit determines the number of mis-predictions from each of the predictive error signals for scanned picture elements. A selection signal M is produced indicating the prediction error signal Y with the least number of mis-predictions, the selection signal controlling a selector to provide the prediction error signal Y in response to the selection signal M. The selected predictive error signal Y is encoded to produce an encoded signal. An adaptive predictive decoding apparatus which decodes the encoded selected predictive error signal is also disclosed.

摘要翻译： 自适应预测编码装置产生预测值P1，P2。 。 。 ，Pn相对于像素x的量化值X。 预测误差信号Y1，Y2，。 。 。 ，从量化值X和预测值P1，P2获得Yn。 。 。 ，Pn。 预测选择电路根据扫描图像元素的预测误差信号确定错误预测的数量。 产生选择信号M，其指示具有最少数量的错误预测的预测误差信号Y.选择信号控制选择器以响应于选择信号M提供预测误差信号Y.所选择的预测误差信号Y被编码 以产生编码信号。 还公开了对编码的选择的预测误差信号进行解码的自适应预测解码装置。