We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
New 35mm Television Film Scanner
By E. H. TRAUB
New solutions for the film transmission problem for both black-and-white and color are described, comprising (1) nonstorage flying-spot scanning technique, (2) continuous exposure and (3) continuous film motion combined with optical compensation. A new form of optical compensator is then discussed which is both simple and small and which provides the possibility of solutions for film-shrinkage correction and iso-film-transport. The new optical compensator is corrected for various aberrations and has good optical efficiency. A color television film scanner incorporating these features is described.
o
FVER THREE YEARS AGO the PhilcO
Research Division started a program of development leading toward the construction of a film scanner, to provide a source of color television signals. Originally planned as a research aid in the development of color television systems and color home receivers, the new Philco Television Film Scanner provides unequalled quality of reproduction from both black-and-white and color motionpicture film.
Background
At the very outset of this development program, it was recognized that existing black-and-white film transmission techniques were far from satisfactory in quality, and that the adaptation of these existing techniques to color television would result in still further deterioration of picture quality combined with unwarranted and excessive complexity of the apparatus.
The type of apparatus generally in use at present comprises a film projector
Presented on October 7, 1953, at the Society's Convention at New York by E. H. Traub, Research Div., Philco Corp., Philadelphia 34, Pa. (This paper was received Nov. 30, 1953.)
converted to 3:2 ratio intermittent operation used in conjunction with means for providing pulse-exposure of light projected onto a storage scanning tube. The unsatisfactory film reproduction in black-and-white resulting from this combination has long plagued equipment manufacturers, broadcasters and the television audience. For color television operation along these lines, three storage scanning tubes instead of one would have to be used, requiring mutually precise registration;, both electronically and optically. The attendant complexities arising from this triplication require no emphasis.
The Problem
Evaluation of these factors led to the conclusion that existing techniques must be regarded as obsolete. A completely fresh approach to the film transmission problem would have to be made which, in terms of picture quality, would give results equal or superior to those of a studio camera and which would be capable of excellent color performance without adding undue complexities to the apparatus.
It was decided that the existing concepts, involving (1) storage scanning
January 1954 Journal of the SMPTE Vol. 62
45