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    • 4. 发明授权
    • Method and apparatus for block coding vertical mode codes for enhanced
compression of image data
    • 用于块编码垂直模式码以增强图像数据压缩的方法和装置
    • US4794461A
    • 1988-12-27
    • US905829
    • 1986-09-10
    • Lawrence G. RobertsAlex E. HendersonFredrick L. Drain
    • Lawrence G. RobertsAlex E. HendersonFredrick L. Drain
    • H04N1/41H04N1/417H04N1/411H04N1/413
    • H04N1/4105H04N1/4175
    • A method and apparatus for improving the performance of data compression processes, such as relative address coding, CCITT standard facsimile processes, and similar two-dimensional image coding processes, by block coding one or more of the vertical mode codes produced by these processes. The performance of data compression processes is improved by representing one or more sequences of vertical mode code words with a single block code word. A reference scan line is preferably selected from among a plurality of previous scan lines, for example, the immediately preceding ten scan lines, for two-dimensional image coding. The previous scan line which is most similar to the current scan line to be coded is selected as the reference scan line. The selected reference scan line is then fed with the current scan line to be coded to a two-dimensional data compression coding process so as to yield a first tier of data compression. The image data are preferably checked during the two-dimensional data compression coding process for a predetermined run of a given vertical mode code, and a preselected block code is substituted if the predetermined run of the given vertical mode code appears so as to yield a second tier of data compression. Preferably, eleven consecutive vertical offset zero code words are represented by a single block code word. This provides enhanced data compression and reduces the amount of image data stored or transmitted and concomitantly lowers the cost for operation of the image data storage or transmission apparatus.
    • 通过对由这些处理产生的垂直模式代码中的一个或多个进行块编码来提高诸如相对地址编码,CCITT标准传真处理和类似的二维图像编码处理之类的数据压缩处理的性能的方法和装置。 通过用单个块代码字表示一个或多个垂直模式码字序列来提高数据压缩处理的性能。 对于二维图像编码,优选从多个先前的扫描线,例如紧接在前的十条扫描线中选择参考扫描线。 选择与要编码的当前扫描线最相似的先前扫描线作为参考扫描线。 然后将所选择的参考扫描线与当前要编码的扫描线一起馈送到二维数据压缩编码处理,以产生第一层数据压缩。 在针对给定垂直模式码的预定行程的二维数据压缩编码处理期间,优选地检查图像数据,并且如果出现给定垂直模式码的预定行程,则产生预选块代码,以产生第二 数据压缩层。 优选地,由单个块码字表示十一个连续的垂直偏移零码字。 这提供增强的数据压缩并减少存储或发送的图像数据的量,同时降低图像数据存储或传输装置的操作成本。
    • 5. 发明授权
    • Method and apparatus for selection of a coding reference line for
two-dimensional coding of image data representing screened images
    • 用于选择用于代表筛选图像的图像数据的二维编码的编码参考线的方法和装置
    • US4729034A
    • 1988-03-01
    • US749606
    • 1985-06-27
    • Lawrence G. RobertsAlex E. Henderson
    • Lawrence G. RobertsAlex E. Henderson
    • G06T9/00H04N1/41H04N1/413H04N1/417H04N1/419H04N7/12
    • H04N1/4105H04N1/4175
    • A method and apparatus for selecting a reference scan line for two-dimensional image coding preferably compatible with known facsimile transmission equipment are disclosed. Selection of a reference scan line in accordance with the method and apparatus of the invention allows data compression for facsimile transmission so that the cost for use of the communication link is reduced. More than one previous scan line is considered as a candidate reference scan line. A reference scan line is selected from among a plurality of previous scan lines, for example, the immediately preceding ten scan lines. The preselected or adaptively selected scan line among the multiple prior scan lines, more particularly, the previous scan line which is most similar to the current scan line to be coded, is selected as the reference scan line. The reference scan line is then fed with the current scan line to be coded to a two-dimensional data compression coding process so as to yield optimum data compression. This reduces the amount of image data transmitted and lowers the cost of operation of the facsimile transmission apparatus. The method and apparatus are particularly effective for compressing image data representing screened pictorial images.
    • 公开了一种用于选择优选与已知传真设备兼容的二维图像编码的参考扫描线的方法和装置。 根据本发明的方法和装置选择参考扫描线允许用于传真传输的数据压缩,从而降低了通信链路的使用成本。 多个以前的扫描线被视为候选参考扫描线。 从多个先前的扫描线,例如紧接在前的十条扫描线中选择参考扫描线。 选择多个先前扫描线之间的预先选择或自适应选择的扫描线,更具体地说,与要编码的当前扫描线最相似的先前扫描线被选择为参考扫描线。 然后将参考扫描线与要编码的当前扫描线一起馈送到二维数据压缩编码处理,以产生最佳数据压缩。 这减少了发送的图像数据的数量,降低了传真发送装置的操作成本。 所述方法和装置对于压缩表示屏幕图像的图像数据特别有效。