1. An image processing device comprising: circuitry configured to apply a displacement adjustment to a first image captured by a first imaging device and to a second image captured by a second imaging device to set a first extraction area and a second extraction area respectively; set a first detection area within the first extraction area and set a second detection area within the second extraction area after the displacement adjustment is applied to the first image and the second image; perform an image adjustment processing on the first extraction area based on pixel values in the first detection area; and perform an image adjustment processing on the second extraction area based on pixel values in the second detection area, wherein the first detection area is set on an imaging target in the first extraction area in case that the imaging target is not at a center of the first extraction area after the displacement adjustment is applied to the first image, and the second detection area is set on the imaging target in the second extraction area in case that the imaging target is not at a center of the second extraction area after the displacement adjustment is applied to the second image.