Image data interpolation processing method
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United States of America Patent
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Jul 17, 2001
Grant Date -
N/A
app pub date -
Sep 28, 1998
filing date -
Nov 11, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An original image containing different kinds of components-areas is adaptively processed by applying interpolating methods suitably selected for respective areas. The processing method comprises the steps of extracting data of a partial image from data of a multi-gradation original image (STEP 1), converting the partial image data into frequency data by using a frequency transformation matrix (e.g., the same size DCT) and storing the transformed data as coefficients of the matrix (STEP 2), calculating a mean of absolute values of the coefficients for each frequency domain (STEP 3), discriminating whether the partial image contains an edge portion by applying the mean coefficient value to conditional equations (STEP 4), selecting a filter for surface interpolation or linear interpolation on the basis of the discrimination result (STEP 5) and interpolating the data of the partial image (STEP 6).
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