Abstract: An image processing apparatus includes stereo cameras and detects a distance to a target around a vehicle. The image processing apparatus includes sensors installed in the vehicle; determines a vehicle situation by combining detection signals of the sensors and switches from image data of a stereo camera for driving assistance to image data of a stereo camera for door opening/closing assistance; carries out distortion corrections that are unique to the plural stereo cameras respectively on the selected image data so that correlation calculation common to the plural stereo cameras can be carried out; carries out the correlation calculation on two sets of image data of the single stereo camera; and detects the distance to the target by using a calculation result of the correlation calculation.