An image signal subjected to three-dimensional noise reduction processing in a three-dimensional noise reduction processing portion is reduced by an electronic zoom portion, and is stored as a low-resolution image in a frame memory. The image signal stored in the frame memory is enlarged by an electronic zoom portion, and is fed to a three-dimensional noise reduction processing portion; it is then converted into an image signal having the same resolution as an image signal of a high-resolution image inputted from outside.
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