Image processing device and method, program recording medium, and imaging system

An image processing method comprising the steps of:

• performing filtering over plural times with respect to an input image;
• generating a plurality of band image signals having different frequency bands from each other from a plurality of output images obtained by the filtering of plural times;
• performing a pixel expansion process of expanding pixels at outer peripheral parts of the plurality of output images obtained by the filtering and at least one image of the plurality of band image signals;
• performing a noise reduction process of reducing a noise component contained in the plurality of band image signals;
• and
• synthesizing the plurality of band image signals subjected to the noise reduction process.

An image processing program recording medium for causing a computer to execute the processes of:

• performing filtering over plural times with respect to an input image;
• generating a plurality of band image signals having different frequency bands from each other from a plurality of output images obtained by the filtering of plural times;
• performing a pixel expansion process of expanding pixels at outer peripheral parts of the plurality of output images obtained by the filtering and at least one image of the plurality of band image signals;
• performing a noise reduction process of reducing a noise component contained in the plurality of band image signals;
• and
• synthesizing the plurality of band image signals subjected to the noise reduction process.