Apparatus for substituting character data for image data using orthogonal conversion coefficients
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United States of America Patent
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-
Dec 5, 1995
Grant Date -
N/A
app pub date -
Jun 1, 1994
filing date -
Jun 1, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A character font combining apparatus having a memory storing data-compressed image data by dividing a digital original image data into a plurality of blocks and applying orthogonal conversion and encoding to the image data for every block. The image data read out from this memory is decoded by a decoding processing circuit, and the orthogonal conversion coefficient is obtained for every block. A plurality of character fonts are stored in the font ROM, and each character font is constituted by at least the orthogonal conversion coefficient of one block, respectively. One of the block of the orthogonal conversion coefficient decoded by the decoding processing circuit and the block of the orthogonal conversion coefficient read out from the font ROM is encoded by the Huffman encoding processing circuit and written as the encoded data in the memory.
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