| 摘要 |
<p>A depth expansion device is equipped with an imaging optical system (2) and a pickup device (3) for forming images (A, B) with different focus positions, and a depth-expanded image generation unit (5) for generating, on the basis of the images (A, B), a depth-expanded image in which the relationship between the distance to the imaging optical system from an object point and change in brightness is maintained. The imaging optical system and the pickup device satisfy conditional expressions (1) and (2) where NA' is the image-side NA for image A, R is the resolution determined by the imaging optical system and the pickup device, d is the optical path interval between the image plane of image A and the image plane of image B, NAn is the NA for whichever of images A or B has a closer pickup distance, and NAf is the NA for whichever has the longer pickup distance. R x Na'/2 <= d ... (1) 0.05 <= (NAf/NAn)2 <= 0.9 ... (2)</p> |
