Selecting a digital camera for telemedicine.
Preliminary applications suggest this method is useful for detecting clouds and studying the relation between irradiance at the ground and cloud distribution. The spectral distribution of radiance as measured is consistent with that obtained by spectrometer and radiative transfer simulation for wavelengths of 430-680 nm, with standard deviation below 1%. Spectral distribution of sky radiance is represented as a polynomial of the wavelength, with coefficients obtained from digital RGB counts by linear transformation. Methods for estimating spectral distribution of sky radiance from images captured by a digital camera and for accurately estimating spectral responses of the camera are proposed. Saito, Masanori Iwabuchi, Hironobu Murata, Isao Experimental results of DH implementation using a DSLR camera show the replication problem.Įstimation of spectral distribution of sky radiance using a commercial digital camera. Simulations of DH using monochromatic and DSLR cameras are presented and a theoretical deduction for the replication problem using the Fourier theory is also shown. In this work, we discuss why DSLR cameras are not extensively used for DH, taking into account the problem reported by different authors of object replication. This fact has implications in their performance. However, in the DSLR cameras, with their RGB pixel distribution, the sampling of information is different to the sampling in monochrome cameras usually employed in DH. The DSLR cameras are a wide, commercial, and available option that in comparison with traditional scientific cameras, offer a much lower cost per effective pixel over a large sensing area. Nowadays, DSLR cameras provide an easy-access alternative that is worthwhile to be explored. Scientific cameras with large formats are offered in the market, but their cost and availability limit their use as a first option when implementing DH. In Digital Holography (DH), the size of the bidimensional image sensor to record the digital hologram, plays a key role on the performance of this imaging technique the larger the size of the camera sensor, the better the quality of the final reconstructed image. Hincapié-Zuluaga, Diego Herrera-RamÃrez, Jorge GarcÃa-Sucerquia, Jorge