1. An imaging apparatus comprising a plurality of optical systems and a plurality of imaging regions in one-to-one correspondence with the plurality of optical systems, wherein each of the imaging regions has a plurality of pixels, and the imaging regions are disposed on optical axes of the respective optical systems on a one-to-one basis, the apparatus further comprises: an origin detecting means for detecting an origin of each of the imaging regions; a pixel position specifying means for specifying positions of the plurality of pixels included in the imaging regions using the origins as references; and a combination means for combining a plurality of images captured by the imaging regions.