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    • 2. 发明授权
    • Encoding method and encoding apparatus, and computer program and computer readable storage medium
    • 编码方法和编码装置,以及计算机程序和计算机可读存储介质
    • US06958714B2
    • 2005-10-25
    • US10793848
    • 2004-03-08
    • Yoshinobu Umeda
    • Yoshinobu Umeda
    • H03M7/46H04N1/41H04N1/419H04N19/00H04N19/40H04N19/423H04N19/48H04N19/90H04N19/93G06K9/36
    • H04N19/93H03M7/46
    • This invention re-encodes encoded data (e.g., PackBits encoded data), which is expressed by a data format of a runlength code part indicating the runlength of the same data and a data part indicating the data, and a runlength code part indicating the runlength of a different data stream and a data part indicating the different data stream, to the same data format without decoding that encoded data, thereby improving a compression ratio. To this end, upon reception of data encoded by a PackBits encoding process, a data division unit separates that data into information indicating the runlength of data, and a data part, and outputs them as num and data. A data processing unit masks a predetermined bit in accordance with an instruction from a monitor unit, and outputs that result to a data combining unit. The data combining unit and a data output unit reconstruct and output data in the PackBits format in accordance with the masked data part and num data.
    • 本发明对由指示相同数据的游程长度的游程长度代码部分的数据格式和指示数据的数据部分表示的编码数据(例如,PackBits编码数据)进行重新编码,以及指示运行长度的游程长度代码部分 的不同数据流和指示不同数据流的数据部分转换成相同的数据格式,而不对该编码数据进行解码,从而提高压缩比。 为此,当接收到由PackBits编码处理编码的数据时,数据分割单元将该数据分离成指示数据的行程长度的信息和数据部分,并将其输出为num和数据。 数据处理单元根据来自监视单元的指令对预定位进行掩蔽,并将结果输出到数据组合单元。 数据组合单元和数据输出单元根据掩蔽的数据部分和num数据重建并输出PackBits格式的数据。
    • 5. 发明授权
    • Method and device for compressing bit-map data
    • 用于压缩位图数据的方法和装置
    • US5777749A
    • 1998-07-07
    • US802096
    • 1997-02-19
    • Tsugio NodaKenichiro Sakai
    • Tsugio NodaKenichiro Sakai
    • H04N1/411G06T9/00H03M7/46H04N1/415H04N1/419
    • G06T9/00H04N1/415H04N1/419
    • The present invention relates to a bit-map compressing method and a bit-map compressing device. The bit-map data compressing method includes a main scanning step for scanning bit-map data in a main scanning direction; a first region separating step for separating a region including black pixels and a region including no black pixels in line unit; a secondary scanning step for scanning in a secondary direction perpendicular to the main scanning direction; a second region separating step for separating a region including black pixels and a region including no black pixels, in column unit; and an encoding step for encoding as an element each region obtained in the first region separating step and the second region separating step. Bit-map can be transferred by effectively performing data compression on simple algorithm, without using special hardware.
    • 位图压缩方法和位图压缩装置技术领域本发明涉及位图压缩方法和位图压缩装置。 位图数据压缩方法包括:主扫描步骤,用于扫描主扫描方向的位图数据; 用于分离包括黑色像素的区域和不包括黑色像素的区域的第一区域分离步骤; 二次扫描步骤,用于沿与主扫描方向正交的次方向扫描; 用于分离包括黑色像素的区域和不包括黑色像素的区域的第二区域分离步骤; 以及编码步骤,用于编码在第一区域分离步骤和第二区域分离步骤中获得的每个区域的元素。 可以通过在简单算法上有效执行数据压缩而不使用特殊硬件来传输位图。
    • 8. 发明授权
    • Encoder in facsimile apparatus generates code words with one bit address
indicating remaining bits are raw unencoded data when number of pixels
in a run length are below a predetermined number
    • 传真装置中的编码器产生一个位地址的代码字,指示剩余位是当游程长度的像素数目低于预定数量时的原始未编码数据
    • US5493407A
    • 1996-02-20
    • US182663
    • 1994-01-13
    • Toru Takahara
    • Toru Takahara
    • G06T9/00H03M7/46H04N1/419H04N1/415H03M7/48
    • H03M7/46G06T9/005H04N1/419
    • A pixel data encoder for use in a facsimile apparatus features a first in first out memory for storing one-dimensional binary pixel data sequences in synchronism with a data acquisition clock; a run length determiner coupled to receive the one-dimensional binary pixel data sequences stored in the first in first out memory, the run length determiner calculating a run length for each of the one-dimensinal binary pixel data sequences received; and an encoding section which issues a one-bit address signal for indicating raw data will be issued and N-bit raw data in the event that the run length is less than a predetermined run length N, the encoding section issuing an address code and a remainder code in the event that the run length exceeds N, the address code consisting of consecutive binary level "1"s with a bit length (M-2) and a binary level "0", and the remainder code consisting of a binary sequence representing the run length wherein the most significant bit of the binary sequence is omitted, M representing a total number of binary digits of the run length.
    • 用于传真装置的像素数据编码器具有先进先出的存储器,用于与数据采集时钟同步地存储一维二进制像素数据序列; 运行长度确定器,其被耦合以接收存储在所述先进先出存储器中的所述一维二进制像素数据序列,所述游程长度确定器计算接收的所述一维二进制像素数据序列中的每一者的游程长度; 并且在游程长度小于预定游程长度N的情况下,将发出发出用于指示原始数据的一位地址信号的编码部分和N位原始数据,编码部分发出地址码和 在游程长度超过N的情况下,由比特长度(M-2)和二进制级别“0”组成的连续二进制级别“1”组成的地址码,以及由二进制序列 表示省略二进制序列的最高有效位的行程长度,M表示游程长度的二进制数字的总数。
    • 9. 发明授权
    • Apparatus for adaptively generating a decoder table for variable-length
codes using a stored coding table
    • 一种用于使用存储的编码表自适应地生成用于可变长度码的解码器表的装置
    • US5481364A
    • 1996-01-02
    • US149907
    • 1993-11-10
    • Kenji Ito
    • Kenji Ito
    • G06T9/00H03M7/42H04N1/41H04N19/00H04N19/423H04N19/426H04N19/625H04N19/91H04N19/93H03M1/40H03M1/42H04N1/419
    • H03M7/425H04N19/13H04N19/60H04N19/91
    • An apparatus for expanding variable-length codes includes a decoder responsive to compressed data, into which quantized data is compressed on the basis of coding table data, for expanding the compressed data on the basis of decoding table data for variable-length codes to produce symbol data. The apparatus further includes a storage in which the decoding table data for variable-length codes is rewritably stored and a table schemer for generating the decoding table data, from the coding table data, to store the decoding table data thus generated into the storage. The decoder is adapted to consult with the decoding table data stored in the storage to expand the compressed data. The apparatus may be provided with an encoder responsive to the quantized data for compressing the quantized data on the basis of the coding table data to produce compressed data associated with the quantized data.
    • 用于扩展可变长度码的装置包括响应于压缩数据的解码器,其中基于编码表数据压缩量化数据,用于根据用于可变长度码的解码表数据扩展压缩数据以产生符号 数据。 该装置还包括一个存储器,其中从编码表数据可重写地存储可变长度代码的解码表数据和用于产生解码表数据的表扫描器,以将这样生成的解码表数据存储到存储器中。 解码器适于与存储在存储器中的解码表数据进行协商以扩展压缩数据。 该装置可以设置有响应于量化数据的编码器,用于基于编码表数据压缩量化数据,以产生与量化数据相关联的压缩数据。