| 摘要 |
<p>A composition unit (103) generates a composite image by compositing a frame image of interest and a processed image obtained by applying minimum value filtering processing to the frame image of interest.</p><p><Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">An LPF processor (104) generates a low frequency component image by applying low-pass filtering processing to the composite image. A difference detector (105) generates a difference image between the frame image of interest and the low frequency component image, and an adder (199) generates a high frequency component image by adding the difference image to the frame image of interest. The composition unit (103) executes composition processing using a minimum composite ratio a so that all pixel values which configure a region in the high frequency component image corresponding to a steep edge region in the composite image are equal to or larger than zero.
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