EP O 1 79 291  B1 _          _          .
As apparent from the above, the blocks 8, 9 and IO re-arrange the original image da_t__ to selectively __. __ ___ _
deCreaSe the di Stan Ce __2 andlof _23 to One Of a nUmbef Of predet_Fmined di StanCeS in aCCOrdan Ce With the
result of the test blocks 6 and J.        _
The re-arranged image data, i.e. the pre-processed image data, in accordance with the present
5  invention, are supplied to the compression means which compresses the data under the two-dimensional
coding scheme of Table 1, for example, as shown in block 1 1, and the operation terminates at block 1 2.
Now descr_ibing the Figs. 4A throgh 6D, the Figs. qA and 4C, F__gs. 5A and 5C and the Figs. 6A and 6C
show the orignal image data, which is the b_i-Ievel image data from a CCD (charge-coupled devices) sensor
array of the document or image scannìng apparatus.
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