The diffractive achromat full spectrum computational imaging with diffractive optics
Type
Conference PaperKAUST Department
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) DivisionVisual Computing Center (VCC)
Computer Science Program
Date
2016-07-11Permanent link to this record
http://hdl.handle.net/10754/621419
Metadata
Show full item recordAbstract
Diffractive optical elements (DOEs) have recently drawn great attention in computational imaging because they can drastically reduce the size and weight of imaging devices compared to their refractive counterparts. However, the inherent strong dispersion is a tremendous obstacle that limits the use of DOEs in full spectrum imaging, causing unacceptable loss of color fidelity in the images. In particular, metamerism introduces a data dependency in the image blur, which has been neglected in computational imaging methods so far. We introduce both a diffractive achromat based on computational optimization, as well as a corresponding algorithm for correction of residual aberrations. Using this approach, we demonstrate high fidelity color diffractive-only imaging over the full visible spectrum. In the optical design, the height profile of a diffractive lens is optimized to balance the focusing contributions of different wavelengths for a specific focal length. The spectral point spread functions (PSFs) become nearly identical to each other, creating approximately spectrally invariant blur kernels. This property guarantees good color preservation in the captured image and facilitates the correction of residual aberrations in our fast two-step deconvolution without additional color priors. We demonstrate our design of diffractive achromat on a 0.5mm ultrathin substrate by photolithography techniques. Experimental results show that our achromatic diffractive lens produces high color fidelity and better image quality in the full visible spectrum. © 2016 ACM.Citation
Peng Y, Fu Q, Heide F, Heidrich W (2016) The diffractive achromat full spectrum computational imaging with diffractive optics. ACM Transactions on Graphics 35: 1–11. Available: http://dx.doi.org/10.1145/2897824.2925941.Sponsors
KAUSTConference/Event name
ACM SIGGRAPH 2016ae974a485f413a2113503eed53cd6c53
10.1145/2897824.2925941