We present a novel approach to the calibration of an ultra wide angle fish eye lenses. These lenses have the field of view larger than 180◦, therefore the common calibration methods based on the classical pinhole camera model with a planar retina cannot be employed. A new camera model is proposed together with a calibration method for extracting its parameters. Experiments evaluating the propos...

Depth recovery is a central concern in computer vision, and many methods were proposed for the monocular depth estimation by zooming as well as focusing and irising. In the past, there are two distinct approaches in depth by zooming; one is from motion parallax along the optical axis using a pinhole camera model, and the other from defocus using a thin lens camera model. This paper presents a n...

Roots of Digital Techniques and Functions in Traditional Film Photography Photography is the result of combining several technical discoveries. Chinese philosopher Mo Di and Greek mathematicians Aristotle and Euclid described a pinhole camera in the 5th and 4th centuries BCE. From rudimentary forms like the pinhole camera and the camera obscura, Film and print photography has transformed with t...

UNLABELLED Ex vivo measurements in animals are used frequently in the field of nuclear medicine for the characterization of newly developed radioligands and for drug development. In vivo SPECT would replace these ex vivo measurements in a relatively large number of cases if one were able to adequately image small organs. The pinhole collimator has been used extensively to obtain greater detail ...

An image super resolution reconstruction method was used to improve the spatial resolution of the thick pinhole imaging system and to mitigate the limitations of the image spatial resolution of the hardware of the image diagnostic system. The thick pinhole is usually applied into the diagnostics of the high energy neutron radiation image. Due to the impacts among its energy flux, spatial resolu...

OBJECTIVES Although transgenic mice have emerged as powerful experimental models of cardiovascular disease, methods for in vivo phenotypic assessment and characterization remain limited, motivating the development of new instruments for biologic measurement. BACKGROUND We have developed a single-photon emission computed tomography system with a pinhole collimator (pinhole SPECT) for high-reso...

Abstract High-resolution optical imaging through or within thick scattering media is a long sought after yet unreached goal. In the past decade, thriving technique developments in wavefront measurement and manipulation do not significantly push boundary forward. The diffusion limit still ceiling. this work, we propose that medium can be conceptualized as an assembly of randomly packed pinhole c...

In this study, we measured the interfacial shear strength between a thermoplastic resin and carbon fiber by novel pinhole-type pull-out method. method, specimen had pinhole formed on thin metal plate filled with resin. A was embedded into pulled out from pinhole. Seven types of polymers were used as resin, including PP, Modified PA6, PA12, PC, PMMA PEEK. shape is determined geometry always cyli...