Super-resolution imaging using a camera array

The angular resolution of many commercial imaging systems is limited, not by diffraction or optical aberrations, but by pixilation effects. Multiaperture imaging has previously demonstrated the potential for super-resolution (SR) imaging using a lenslet array and single detector array. We describe the practical demonstration of SR imaging using an array of 25 independent commercial-off-the-shelf cameras. This technique demonstrates the potential for increasing the angular resolution toward the diffraction limit, but without the limit on angular resolution imposed by the use of a single detector array

Esport, societat i identitat col·lectiva a la Catalunya contemporània

La introducció de l’esport modern a finals del segle xix es va identificar a Catalunya amb una aposta per la modernització de la societat. Organitzat des de l’àmbit civil, els clubs van protagonitzar la consolidació de l’esport, tant en el vessant de la pràctica com en el de l’espectacle, i de comú acord amb el catalanisme van intentar projectar-se amb la candidatura de Barcelona com a seu olímpica el 1924. La dictadura franquista va sotmetre tota l’activitat esportiva i va intentar eliminar la significació catalanista i democràtica d’entitats com el Futbol Club Barcelona. La recuperació democràtica va ressituar tot l’esport, amb l’impuls de l’esport per a tothom i el reconeixementinternacional dels Jocs Olímpics de Barcelona de 1992

Extended depth-of-field imaging and ranging in a snapshot

Traditional approaches to imaging require that an increase in depth of field is associated with a reduction in numerical aperture, and hence with a reduction in resolution and optical throughput. In their seminal work, Dowski and Cathey reported how the asymmetric point-spread function generated by a cubic-phase aberration encodes the detected image such that digital recovery can yield images with an extended depth of field without sacrificing resolution [Appl. Opt. 34, 1859 (1995)]. Unfortunately recovered images are generally visibly degraded by artifacts arising from subtle variations in point-spread functions with defocus. We report a technique that involves determination of the spatially variant translation of image components that accompanies defocus to enable determination of spatially variant defocus. This in turn enables recovery of artifact-free, extended depth-of-field images together with a two-dimensional defocus and range map of the imaged scene. We demonstrate the technique for high-quality macroscopic and microscopic imaging of scenes presenting an extended defocus of up to two waves, and for generation of defocus maps with an uncertainty of 0.036 waves

Sports, society and collective identity in contemporary Catalonia

In Catalonia, the introduction of modern sports in the late 19th century was considered tantamount to a quest to modernise society. Clubs organised by civil society played a key role in consolidating sports as both practice and entertainment, and in league with Catalanism these clubs sought to put forth Barcelona’s candidacy to host the 1924 Olympics. The Franco dictatorship subjugated all sports activities and strove to eliminate the Catalanist and democratic meaning of organisations like Futbol Club Barcelona. The resumption of democracy rekindled all sports, with the drive for “sports for everyone” and the international recognition of the 1992 Barcelona Olympics