1. An image processing apparatus comprising: an image acquisition unit that acquires an image that is to be subjected to processing; a learning sample extraction unit that extracts data of a plurality of learning samples from the image; a classifier learning unit that performs learning of a plurality of classifiers using the plurality of learning samples; a strong classifier generation unit that generates a strong classifier by combining the plurality of learned classifiers; and a saliency map generation unit that generates a saliency map of the image using the strong classifier.