Method and apparatus for image data compression

Details Method and apparatus for image data compression Method and apparatus for image data compression

H - Electricity

04

N

350/7

H04N 1/41 (2006.01)

Patent

CA 1288859

METHOD AND APPARATUS FOR IMAGE DATA COMPRESSION ABSTRACT OF THE DISCLOSURE A method and apparatus for selecting a refer- ence scan line for two-dimensional image coding prefer- ably compatible with known facsimile transmission equip- ment are disclosed. Selection of a reference scan line in accordance with the method and apparatus of the in- vention allows data compression for facsimile trans- mission 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 ref- erence scan line is selected from among a plurality of previous scan lines, for example, the immediately pre- ceding 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 se- lected 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. DDDDD4/6843-27

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