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Figure 1: The power spectra of a Gaussian PSF (a) and of the PSF of a coded aperture (b): Fourier magnitudes that are too low are clipped (black), which causes ringing artifacts. Image projected in focus (c), and with the same optical defocus (approx. 2m distance to focal plane) in three different ways: with spherical aperture-untreated (b) and deconvolved with Gaussian PSF (e), with coded aperture and deconvolved with PSF of aperture code (f). The sub-images in c-f are photographs of the apertures and their captured PSFs.

Figure 1: The power spectra of a Gaussian PSF (a) and of the PSF of a coded aperture (b): Fourier magnitudes that are too low are clipped (black), which causes ringing artifacts. Image projected in focus (c), and with the same optical defocus (approx. 2m distance to focal plane) in three different ways: with spherical aperture -untreated (b) and deconvolved with Gaussian PSF (e), with coded aperture and deconvolved with PSF of aperture code (f). The sub-images in c-f are photographs of the apertures and their captured PSFs. AbstractWe integrate coded apertures into off-the-shelf projectors to increase their focal depth. The regional defocus of the projection on the surface is measured automatically. The projected images are then deconvolved with locally scaled aperture codes. This leads to significantly better results than deconvolving with Gaussians in cases where regular spherical apertures are used.

Figure 1: Basic object manipulation techniques such as translation (a) and rotation (b) are illustrated in long exposure photographs. Augmentation can be projector-based (a-c) or via video-see-through (d). These application examples show basic augmentations of building structures (a,b,d), distance measurements (c) and material-color simulations (c).

Coding a projector's aperture plane with adaptive patterns together with inverse filtering allow the depth-of-field of projected imagery to be increased. We present two prototypes and corresponding algorithms for static and programmable apertures. We also explain how these patterns can be computed at interactive rates, by taking into account the image content and limitations of the human visual system. Applications such as projector defocus compensation, high-quality projector depixelation, and increased temporal contrast of projected video sequences can be supported. Coded apertures are a step towards next-generation auto-iris projector lenses.