SU140094A1 - Electronic method of printing combined frames - Google Patents

Description

The known methods of electronic printing of combined color and black-and-white frames are complex and do not provide the required quality of the resulting image. To scan the foreground image and expose the background image in some of them, separate cathode ray tubes are used. In others, the foreground image scan and the background image are imprinted alternately with a single cathode ray tube, using the foreground signal delay (silhouette signal) on time equal to the frame scan period.

The disadvantage of these methods is the need to accurately align the rasters of the individual cathode-ray tubes used and to preserve this alignment during operation, which is very difficult to achieve under operating conditions, as well as the need to apply storage (delay) devices that complicate and increase the cost of equipment and Significantly cause distortion of the resulting image.

The proposed electronic method of printing combined frames makes it possible to refuse complex and expensive storage or delay devices and does not require combining the rasters of the two electron beam tubes used for image analysis. The method makes it possible to simplify the process of printing the combined color and. black-and-white frames and improving the quality of the resulting image The essence of the method consists in using one cathode ray tube, which creates a luminous flux with two different spectral components, one of which is used to analyze the image reprinted onto another film, and the second . The image from one film is transferred to another using one cathode ray tube with a running film.

No. 140094-2 beam generating light fluxes with two different spectral components (for example, infrared and white radiation). For this purpose, one spectral component of the light flux of the tube through the separation filters passing only this component, hits the film with a negative image of the transferred frames and analyzes the image using the method of a running beam. The resulting electrical signal changes the potential of the cathode of the tube to excite radiation in a tube with a different spectral component, which records the desired signal on another film.

The drawing shows a schematic diagram of an installation for electronic printing, in accordance with the described method, of combined color and black-and-white frames.

The cathode ray tube / is equipped with a screen consisting of two layers of a transparent cathode luminophor. One of the phosphors has a spectral radiation characteristic close to that of white light. The second phosphor emits in the ultraviolet or infrared region. Depending on the accelerating voltage on the tube, it is possible to excite only the second phosphor or both phosphors, i.e., change the glow color of the screen from ultraviolet (or infrared) d / o white plus ultraviolet.

A raster from the screen of the tube 1 using the lens 2 and the translucent mirror 3 is projected simultaneously into the frame windows of film channels 4 and 5. A film with a negative image of the foreground (actor), shot on a white background, is pulled through the frame channel 4 Film Channel 5 is a film with a negative image of the background and an unexposed color or black and white film. The light filter 6 transmits only the rays of the visible region of the spectrum. Filter 7 is transparent only to the ultraviolet or infrared region.

The foreground (actor) image is analyzed by the method of a traveling beam with ultraviolet (or infrared) radiation of the tube, and the signal from the output of the photomultiplier 8 after the amplifier 9 and the limiter 10 controls the output voltage of the rectifier} 1. The change in voltage between the anode and the cathode of the tube causes the screen to change color from white plus ultraviolet to ultraviolet, which allows the background to be imprinted into places not occupied by the actor. The second exposure (foreground imprinting) is performed by a conventional light source in the movie channel 12.

Subject invention

An electronic method of printing combined frames, characterized in that. in order to increase the quality and simplify the printing process, a cathode ray tube is used, which creates a light flux with two different spectral components, one of which is used to analyze the image reprinted on another film and the second to print this image.

Film with negative image of front plan

Nonexpontally priced or h 6 film