Image coding apparatus for compressing image data
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United States of America Patent
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May 18, 1999
Grant Date -
N/A
app pub date -
May 30, 1997
filing date -
Jan 10, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A data processor in an image coding apparatus includes a zero detecting circuit for determining if the quantized AC coefficients are zero or not; a counter, that is reset periodically, for counting the quantized AC coefficients that are not zero; a comparator for comparing the count of the counter and a first reference value, and outputting an AC coefficient eliminating signal when the count exceeds the first reference value; and a first logic circuit for forcibly replacing the quantized AC coefficients with zero based on the AC coefficient eliminating signal so that the volume of data of the quantized AC coefficients that are not zero is reduced. The image coding apparatus cuts off some portions for the images having a large volume of codings, and keeps the volume of data below a predetermined maximum.
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