| 摘要 |
<p>A coding method and a coding apparatus for bi-level document image which makes a high speed coding processing possible is provided. In the coding apparatus, an image reading processing section (1) provides an image data reading means (5) which reads bi-level image data from a RAM (3), a CX generating means (6) which generates CX using image data in a line memory (4) and a CX counting means (7) which counts the number of appearance times of CX based on the CX generated by the CX generating means (6) and the inputted bi-level image data. In the coding apparatus, a coding processing section (2) provides a coding processing deciding means (8) which decides to implement either of two kinds of coding processing, a normal coding means (9) which implements a normal coding processing implementing a conventional JBIG algorithm and a high speed coding means (10) which implements a high speed coding processing using the counted values. With this, at the case of the image having a large amount of white areas such as a bi-level document image, the efficiency of the coding processing is improved and as a result the high speed coding processing can be realized. <IMAGE></p> |
