SU864228A1 - Method of monitoring horizontal and vertical instability of motion-picture film in camera film gate - Google Patents

Description

The invention relates to film technology, and more specifically to methods for controlling the parameters of movie cameras, and can be used to control horizontal and vertical instability of the film in the movie channel of the movie camera.

A known method of monitoring horizontal and vertical instability of a film based on the shooting of test objects with subsequent chemical photographic processing of the exposed film and viewing it on the screen or through a microscope [1J.

The disadvantage of this method is the low accuracy of control due to the resolution of the lens-camera-film system, the complexity and duration of the control process, determined by the need for chemical photographic processing of the film, measurements and subsequent processing of the results.

The closest in technical essence to the proposed one is the control method, which consists in comparing the lengths of the movable sections of the film relative to the mark applied to the film in the film channel of the movie camera after each transportation • to the frame step (2].

The disadvantage of this method is ¹⁰ limit the accuracy of measurement of time intervals due to uneven transport of the film, the need to install a camera magnetic recording head and ispol'uet ⁵ eovanie film magnetic path, which leads to a change in the actual conditions of the film transport in a movie camera, and this in turn to the emergence of a certain po- ²⁸ sinfulness, which reduces the accuracy of the "object of the invention is to improve the accuracy and enhanced functionality.

This goal is achieved in that the comparison of the lengths is carried out by scanning the distances in each frame from the horizontal and vertical boundaries of the working perforation to the mark at the time the intermittently moved film is standing.

In FIG. 1 shows a diagram of applying a mark to a film in a movie camera; in FIG. 2 - part of the film with the marks; in FIG. 3 is a schematic diagram of a measuring device.

To implement the method, the controlled movie camera 1 is charged with unexposed film 2 and installed on a single stand 3 in front of the emitter 4 of the pulsed laser (Fig. 1). In this case, the lens 5 of the controlled movie camera 1 is set to infinity, and the mechanism (not shown) is synchronized using a synchronizing device 6 with the starting device 7 of the pulsed laser emitter 4. The movie camera 1 is started, at the same time the emitter 3 is turned on using the starting device 7 through the synchronizing device 6. The following pulses are set by the starting 7 and synchronizing 6 devices with a certain time delay with respect to the moment the shutter (not shown) opens the frame window (not shown), which allows us to exclude the influence of the longitudinal instability of film 2 in the frame window, which is present at the initial moment after stopping film 2, on the resulting shape of label 8, “this is in its own way q leads to a decrease in the methodological error of measuring the horizontal and vertical instability of the film 2. Next, film 2 (Fig. 2) with marks 8 on it with coordinates X, Y relative to the boundaries of the working perforation cl in each frame (not shown), is set to measuring device (Fig. 3). The measurement of these coordinates in each frame characterizes a certain amount of horizontal and vertical instability of film 2. The measuring device provides intermittent transportation of film 2 with printed marks 8 per step

864228 4 frames for working perforations cl using intermittent conveying mechanism 9, projection of an image of a portion of film 2 with an angle of working perforation CI and mark 8 using a lighting system 10 and lens 11 on a sensing element 12, for example, a video recorder of a scanning device 13, measuring the coordinates X, Y of the label 8 in each frame using a scanning device 13, such as a television, and transmitting information to a recording device 14, such as a two-coordinate builder. According to the results of the signal change, the size of the instability of the film in the film camera is judged.

The proposed method makes it possible to increase the accuracy of measuring a controlled parameter by significantly reducing the methodological error, completely eliminating the influence of the error of transporting film on the frame pitch by a measuring device and using a high resolution scanning device.

Claims (2)

This goal is achieved by comparing the lengths by scanning the distances in each frame from the horizontal and vertical boundaries of the working perforation to the mark at the time of the motion of the perpendicularly moving film. FIG. I shows the scheme of labeling a film in a movie camera; in fig. 2 - part of the film labeled; in fig. 3 - schematic diagram of the measuring device. For the implementation of the method, the controlled camera 1 is charged with unexposed film 2 and installed on a single stand 3 in front of the radiator 4 of the pulsed laser (Fig. O. The lens 5 of the controlled camera 1 is set to infinity and the mechanism (not shown) is synchronized using a synchronizing device 6 with the starting device 7 of the pulse laser emitter 4. The camera 1 is started up, and simultaneously the emitter 3 is turned on with the help of the starting device 7 through the synchronizing device 6 The following pulses are set by the starting device 7 and synchronous 1; the device 6 with a certain time delay relative to the moment when the shutter (not shown) of the frame window is opened (not shown), which makes it possible to eliminate the influence of the longitudinal instability of the film 2 in the frame window, which is present at the initial moment after the film 2 stops, on the resulting shape of the mark 8, dL, this in turn leads to a decrease in the methodological error of measuring the horizontal and vertical instability of the film 2. Next nople dog 2 (FIG. 2) with 8 marks marked on it with coordinates X, Y with respect to the boundaries of the working perforation, and in each frame (not shown), set up a measuring device (Fig. 3). And measuring these coordinates in each frame characterizes a certain amount of horizontal and vertical instability of film 2. The measuring device provides intermittent transportation of film 2 marked 8 at step 84 frame for working perforations and using the mechanism 9 of intermittent transport, the projection of an image of a section of film 2 with an angle working perforation O1 and mark 8 with the help of the lighting system 10 and the lens 11 on the sensitive element 12, for example, the Vidicon scanner 13 , measuring the coordinates X, Y marks 8 in each frame using a scanning device 13, such as a television, and transmitting information to the recording device 14, such as a two-coordinate plotter. According to the results of the change in the signal, the instability of the film in the filming apparatus is judged. The proposed method makes it possible to increase the measurement accuracy of the monitored parameter by significantly reducing the methodological error, completely eliminating the influence of the film transport error on the frame step by the measuring device and using a high-resolution scanning device. The invention of the method of controlling the horizontal and vertical instability of a film in a movie camera channel, which consists in comparing the lengths of moving sections of film ho relative to the label applied to the film in the movie channel of the camera after each transporting it to a frame step that is different in order to increase accuracy and extending the functionality, the length comparison is performed by scanning the scans in each frame from the horizontal and vertical boundaries of the working performance. to the mark at the moment of the motion of a film moving intermittently. Sources of information taken into account during the examination 1. Gordiychuk I. B. Soviet film equipment, M., Art, 1974, p. 263-270. 2. USSR author's certificate for application number 2644939 / 18-10, cl. G 03 B 43/00, 1978 (prototype). ABOUT ABOUT X / and d.}