Tecnología de la televisión: del disco de Nipkow a la revolución numérica [ Carmen Peñafiel] on *FREE* shipping on qualifying offers. Lejona. Nipkow-Disk Category:Nipkow disks enwiki Nipkow disk; eowiki Nipkov- disko; eswiki Disco de Nipkow; frwiki Disque de Nipkow; glwiki Disco de Nipkow . Deep Red Leather-like Accent Chair, Small Office Waiting Area Chair – perfect for small spaces, the clean lines and art deco look of this chair are almost as great.
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The resolution along a Nipkow disk’s scanline is potentially very high, being an analogue scan. This can be intuitively understood by covering all of the disk but a small rectangular area with black cardboard which stays fixedspinning the disk and observing an object through the small area.
So the ideal Nipkow disk should have either a very large diameter, which means smaller curvatureor a very narrow angular opening of its viewport. If the file risco been modified from its original state, some details such ddisco the timestamp may not fully reflect those of the original file. Articles needing additional references from March All articles needing additional references.
Another drawback of the Nipkow disk as an image scanning device: These holes are positioned to form a single-turn spiral starting from an external radial point of the disk and proceeding to the center of the disk. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission. Some means of synchronizing the disks on the two devices must also be devised several options are possible, ranging from manual to electronic control signals.
Another way to produce acceptable images would be to drill smaller holes millimeter inpkow even micrometer scale closer to the dde sectors of the disk, but technological evolution favoured electronic means of image acquisition. Retrieved from ” https: However the maximum number of scanlines is much more limited, being equal to the number of holes on the disk, which in practice ranged from 30 towith rare hole disks tested.
Another serious disadvantage lay with reproducing images at the receiving end of the transmission which was also accomplished with a Nipkow disk. This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it.
The patterns may nipkkw may not partially overlap, depending on the exact construction of the disk. Iconoscopes and their successors accumulate energy on the target continuously, thereby integrating energy over time.
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Nipkow disk – Wikidata
Summary [ edit ] Description Disco nipkow Description Disco nipkow If the jipkow is made to control a light behind a second Nipkow disk rotating synchronously at the same speed and in the same direction, the image will be reproduced line-by-line. This file is made available under the Creative Commons CC0 1.
A Nipkow disk sometimes Anglicized as Nipkov disk; patented inalso known as scanning diskis a mechanical, rotating, geometrically operating image scanning device, patented in by Paul Gottlieb Nipkow. The devices using them were also noisy and heavy with very dee picture quality and a great deal of flickering.
Further disadvantages include the non-linear geometry of the scanned images, and the impractical size of the disk, at least in the past. The holes may also be square for greater precision. The scanning system simply “picks off” the accumulated charge as it nipkwo past each site on the target. Retrieved from ” https: From Wikipedia, the free encyclopedia. This page was last edited on 28 Disccoat The scanning disk can nupkow replaced by a polygonal mirror, but this suffers from the same problem — lack of integration over time.
One of the advantages of using discl Nipkow disk is that the image sensor that is, the device converting light to electric signals can be as simple as a single photocell or photodiodesince at each instant only a very small area a pixel is visible through the disk and viewportand so decomposing an image into lines is done almost by itself with little need for scanline timing, and very high scanline resolution.
When the disk rotates, the holes trace circular ring patterns, with inner and outer diameter depending on each hole’s position on the disk and thickness equal to each hole’s diameter.
The size of the reproduced image is again determined by the size of the disc; a larger disc produces a larger image. Apart from the aforementioned mechanical television, which never became popular for the practical reasons mentioned above, a Nipkow disk is used in one type of confocal microscopea powerful optical microscope.
I, the copyright holder of this work, hereby publish it under the following license:. Another advantage is that the receiving device is very similar to the acquisition device, except that the light-sensitive device is replaced by a variable light source, driven by the signal provided by the acquisition device.