Image processing apparatus and method, and storage medium
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United States of America Patent
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Jul 20, 2004
Grant Date -
N/A
app pub date -
Nov 9, 2000
filing date -
Nov 11, 1999
priority date (Note) -
Expired
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Abstract
A discrete wavelet transformer computes the discrete wavelet transform of an input X-ray image, a quantizer quantizes coefficient values corresponding to a region of interest of the transformed coefficients as values relatively larger than coefficients corresponding to a non-region-of-interest, and an entropy encoder generates a code sequence by encoding the quantized coefficient values. The region of interest is extracted in such a manner that an irradiation region extraction unit detects an irradiation field region of X-rays of the input X-ray image, detects a through region by computing the histogram of pixel values of that irradiation field region, and removes the through region from the irradiation field region.
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