1. An image processing device comprising: an image sequence acquisition section that acquires an image sequence that includes a plurality of images; and a processing section that performs an image summarization process that acquires a summary image sequence based on a first deletion determination process and a second deletion determination process that delete some of the plurality of images included in the image sequence acquired by the image sequence acquisition section, wherein: the processing section sets an attention image sequence that includes one attention image or a plurality of attention images included in the plurality of images, selects a first reference image from the attention image sequence, selects a first determination target image from the plurality of images, and performs the first deletion determination process that determines whether or not the first determination target image can be deleted based on first deformation information that represents deformation between the first reference image and the first determination target image, the processing section sets a partial image sequence from the image sequence, a plurality of images that have been determined to be allowed to remain by the first deletion determination process being consecutively arranged in the partial image sequence, and the processing section selects a second reference image and a second determination target image from the partial image sequence, and performs the second deletion determination process that determines whether or not the second determination target image can be deleted based on second deformation information that represents deformation between the second reference image and the second determination target image.