Monitoring camera and image processing method

An image processing method executed by a monitoring camera, the image processing method comprising:

• transmitting specific-wavelength light having a wavelength equal to or larger than a specific wavelength among light that is from a subject and that is incident through fog or haze by an optical filter provided in the monitoring camera;
• acquiring, for each of pixels, a blue component signal, a red component signal, and a green component signal corresponding to the specific-wavelength light captured by an image-capturing element that comprises a plurality of the pixels and that is provided in the monitoring camera;
• generating and outputting, by a first processor, a captured image of the subject based on either the blue component signal, the red component signal, and the green component signal for each of the pixels corresponding to the specific-wavelength light or the blue component signal for each of the pixels corresponding to the specific-wavelength light;
• and
• specifying, by a second processor, a region of interest of an image captured by the image-capturing element,
• wherein, when the fog or the haze occurs in the region of interest, the first processor selects either the blue component signal, the red component signal, and the green component signal for each of the pixels corresponding to the specific-wavelength light or the blue component signal for each of the pixels corresponding to the specific-wavelength light, in accordance with a degree of the fog or the haze that occurs in the region of interest.