Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-04-22
1987-01-20
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358285, H04N 106
Patent
active
046383700
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for digitalizing an image by analysis by means of a light beam, and more particularly to an apparatus of the type comprising means for fixing the carrier of an image to be analyzed, at least one source of light, a first optical device for projecting a light beam issued from said source onto the image to be analyzed, means of relative displacement between the beam and the image carrier for successively lighting, line by line, the elements of image of the image to be analyzed, and a converter comprising an optico-electrical device to convert in digital form the information representing the image elements.
Image digitalizing apparatus as well as apparatus used for restituting digitalized images are employed in particular for transmitting images in connection with systems of teledetection by satellites.
It is a particular object of the invention to provide an apparatus permitting the analysis of images carried by a transparent medium, such as a film.
This object is reached with an apparatus of the aforedescribed type, in which according to the invention: portion of cylinder and designed to receive the image carrier, coincides with that of the analysis cradle, said mirror receiving the light beam and reflecting it perpendicularly to the surface of the cradle, and of which are placed the pivoting mirror and the optico-electrical device, receives the light which has gone through the analysis cradle and the image carrier, and sends back on a fixed photosensitive zone of said optico-electrical device the light issued from the different image elements of a same line.
Due to the use of an elliptic mirror, no aberration is introduced for all the image elements of every line.
Analysis of successive lines is achieved by means of a stepwise-moving device permitting the displacement of the cradle according to an axial translation, and with respect to the rotating mirror and to the optical devices. The reflecting surface of the elliptic mirror can thus be restricted to a relatively narrow strip of an elliptic surface, the only requirement being that the width of such strip should allow the reflection of the line scanning beam. The construction of an elliptic mirror is therefore relatively simple and rather inexpensive.
According to a special feature of the apparatus according to the invention, said apparatus further comprises a restitution cradle which is separate from the analysis cradle and is designed to receive a carrier of an image to be restituted from information modulating the light beam issued from the light source, both analysis and restituting cradles being situated on the same cylindrical surface and being secured to one another, so that the means used for line scanning and for column scanning the carrier of an image to be restituted are the same as those used for scanning the carrier of an image to be analyzed.
A device for restituting a digitalized image and a device for analyzing an image to be digitalized are thus combined within the same apparatus.
Further features and advantages of the apparatus according to the invention will be more readily apparent on reading the following description made with reference to the accompanying drawings in which:
FIG. 1 is a diagrammatical general view of one embodiment of the apparatus according to the invention, and
FIG. 2 is a cross-sectional view along plane II--II of FIG. 1.
The apparatus illustrated in the drawings comprises a carriage 10 which is slidable along a rectilinear slide 11a of a fixed horizontal table 11. The movement of the carriage is controlled by a stepwise motor (not shown) driving in rotation a micrometric screw 12 in engagement with the carriage 10.
The carriage 10 supports a structure 13 of general cylindrical shape whose upper part constitutes a cradle 14 supported by two annular side-plates 15, 16 rising at the longitudinal ends of the carriage 10 perpendicularly to the direction in which said carriage advances. The cradle 14 is designed to receive an image carrier such as a film 20, carrying an imag
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Telecommunications and Radio Engineering, vol. 25, 26, pp. 21-27, Oganov et al., 3/1971.
Fouche Claude
Maincent Gabriel
Rosier Jean-Claude
Fox John C.
Masinick Michael A.
Societe Europeenne de Propulsion
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