Image processing apparatus and image processing method

An image processing apparatus comprising:

• processing circuitry;
• and
• a memory storing a program to cause the processing circuitry to
• extract a plurality sets of region of interest within a visible-light image captured by a visible-light camera, each of the plurality sets of region of interest having a different level of visibility,
• receive an infrared image including the plurality sets of the region of interest captured by an infrared camera observing a same subject as the visible-light camera,
• transform the infrared image including the plurality sets of the region of interest to a plurality of modal images each corresponding to each of the plurality sets of the region of interest, and
• generate a presentation image by superimposing the plurality of modal images on the plurality sets of the region of interest within the visible-light image respectively, by weighted averaging of the plurality of modal images and the corresponding sets of the region of interest within the visible-light image at a respective mixing ratio, the respective mixing ratio being adjusted based on the level of visibility of each of the plurality sets of the region of interest within visible-light image.