SU1408414A1 - Device for identifying deformation of cine and photo materials - Google Patents

Abstract

The invention relates to film technology. and, the spruce of the invention is to improve the accuracy by providing for the determination of local deformations and speeding up the measurement process. Depending on the property of the observed object, the device provides three modes of operation: a change in the flatness of the unexposed or exposed film photographic material, technological measurements of the production processes of the base; measurement of the flatness of the exposed film photographic material, determination of local deformations of the film photographic material. 5 il.

Description

00 4

The invention relates to film engineering and, in particular, to devices for determining the deformation of film photographs — local defects and flatness.

The purpose of the invention is to improve accuracy by providing a definition of local deformations and speeding up the measurement process.

FIG. Figure 1 shows the mutual arrangement of the main elements, illustrating the principle of the device for determining the deformation of film photographs; in fig. 2 - projections onto the target of a television tube of a cinema photograph crossed by a light plane; in fig. 3 - a graph of flatness versus normalized relative to the parameters of the boom raster deflection; in fig. 4 - family of curves of flatness variation from the chord length normalized with respect to the parameters of the raster; in fig. 5 is a schematic diagram of the proposed device for determining the deformation of cinema photographs.

A device for determining the deformation of film photographs consists of a light source 1, a light plane formation unit 2, a first spectrum converter 3, a film photographic 4, a cassette 5, a second spectrum converter 6, a television camera 7, an amplitude limiter 8, a video recording unit 9, a chord estimation unit 10 , computing unit 11, flatness registration unit 12, light plane wobble block 13, light plane number selection block 14, deflection boom selection block 15, mode selection block 16, b scan control loop 17 and parallax sensor 18.

The light source 1 through the series-connected light plane formation unit 2, the first spectrum converter 3, film 4 and the second spectrum converter 6 are connected to the optical input of the television camera 7. The signal output of camera 7 is connected to the amplitude limiter 8, the output of which is connected in parallel with the input a video recording unit 9, with the first input of the deflection boom selection unit 15 and with the first input of the chord estimation unit 10. The output of the latter is connected to the signal input of the computing unit 11, the output of the block 14 for selecting the number of light planes is connected to the input of the light plane wobble unit 13, the first output of which is connected to the second input of the light plane formation unit 2, and the second output of the light plane wobble unit 13 with the first control, it is the entrance of a television camera 7.

The first and second inputs of the block 14 selection of the number of light planes are connected respectively to the first output of the block 16 mode selection and the first output of the sensor 18

five

five

0

0

five

0

five

0

parallax. The second and third outputs of the mode selection blot 16 are respectively connected to the second input of the deflection boom selection unit 15 and to the first input of the scanner control unit 17, the output of which is connected to the second control input of the television camera 7. The tensometric output of the camera 7 is connected to the first input of the sensor 18 parallax, the second and third outputs of which are respectively connected to the control input of the computing unit 11 and the third input of the deflection boom selection unit 15.

The second input of the sensor 18 parallax connected to the strain gauge output of the source 1 of the light flux. The synchronizing output of the television camera 7 is connected in parallel with the third input of the block 14 for selecting the number of light planes, with the second input of the sweep control unit 17, with the third input of the deflection boom selector 15 and with the second input of the chord estimator 10, the third input of which is connected to the output of block 15 selection of deflection arrows.

The principle of operation of the proposed device is based on the analysis of the television image of the BC curve (Fig. 1), obtained by B as a result of the cross section of the film photograph by the ABC light plane, formed by the light flux source 1 and the light plane formation unit 2, which are located at point A. The ABC plane is located under some angle a to the plane oyz. In order for the BC curve, which is in general a part of an ellipse, to be projected as a circular arc onto the target of a transmitting television tube of camera 7 located at point F (Fig. 1), the condition 2a-f | 3 90 ° must be fulfilled. ,(one)

where p is the angle between the BFC plane and the OYX plane.

In this case, the projection of the image of the BC segment onto the target of a television camera is similar to the image of a cinema photograph when it is observed along the Y axis. The definition of flatness reduces to estimating the chord size be and its corresponding arc a (Fig. 2). Since the measurement by television methods of arc a is difficult, the flatness is determined by the length of the chord be with a fixed value of the deflection h. Then flatness is expressed by the following ratio

X (%) sin2, (2)

at 7 in radians;

X (o /) - BC..sin2

 V / o / 1 uo

gr

100

at y ° in degrees

where t is arctg.

When analyzing a television image with a 1: 1 aspect ratio, the values of h and be are normalized to the raster parameters

1 N; Bsnorm

Tstr

to,

where h is the number of lines corresponding to the length

deflection arrows;

Z is the number of rows of the television raster; tic is the time over which the reading beam travels the distance between points b and c;

Trpr is the time of the forward course of the horizontal scan. In this way.

2N Y arctg-j

and in the limiting case when Tstr t. with, ,

For arctg 2N Y0 Substitutes YO from (4) to (2), a ratio of the measured flatness value X to N is obtained. In FIG. 3 shows a plot of X as N varies from 1 to 0.1. As can be seen from the graph, an increase in N leads to a decrease in the limit of measured flatness, however, the unreasonable overestimation of the value of N causes significant errors in measurements of X, close to 100%. For real values of flatness, N values ranging from 0.5 to 0.1 are optimal, while limit values of X vary from 75% to 96%, respectively. With X lying in the range of 90-99%, it is advisable to reduce the value of N to 0.02-0.05.

FIG. Figure 4 shows the family of curves of X from the parameter K for three different values of N. These curves are calibration for television instrumentation for measuring the flatness of film photographs. When assessing local deformations of a cinema photograph using a set of secant light planes, a working raster is formed, which, when interacting with a reference raster of a television camera, forms a moire interference pattern.

Depending on the property of the object being observed, the device for determining the deformation of film photographic materials provides three modes of operation: changing the plane of the unexposed or exposed film photographic material, technological measurements of the production processes of the base; measurement of the flatness of the exposed cinema photographs; definition of local deformations of a cinema photo.

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ten

15

20

25

zos

40 55

50

In the first mode of operation, the spectrum of the source 1 of the light flux is transferred to the near infrared region using the first converter 3 of the spectrum, which allows exploring unexposed cinematographic materials. The infrared light planes formed in block 2 illuminate the cinema 4 (Fig. 1) fixed in the cassette 5. The image of the cinema photo illuminated by the light planes transferred by the second spectrum converter 6 to the visible region is projected onto the target of the number of light planes The formation of a certain (1-15) number of light planes, determining the number of flatness measurements in the field of view of the transmitting chamber 7.

The number of planes (dimensions) depends on. the degree of deformation of the studied area of the film photographic material (the deformation is greater, the smaller the light planes should be), since an excessive increase in the planes leads to the intersection of the reading tube of the television tube of the camera 7 in the image repeatedly illuminated by the light planes of the photographic material, which causes false information and moire distortions. Information from the block 14 for selecting the number of light planes enters the block 13 for the wobbles of the light planes, where a constant "swing of the light planes is performed in order to avoid" printing the image on the target of the transmission tube in the television camera 7.

From block 13, the corresponding signals arrive at block 2 of the formation of light planes and scan of camera 7. Using the parallax sensor 18, estimate the angle of inclination of the light planes coming from the light flux source 1 through block 2 of the formation of light planes to the optical axis of the television camera 7 (Fig. one). Thus, blocks 1, 2, 3, 13, 14, and 18 are intended to form in the infrared range the spectrum of a family of light planes (light test) located at a certain angle to the optical axis of camera 7. The intersection lines of these planes with the photographic material carry information about the degree of flatness of cinema.

The flatness assessment is carried out according to the method outlined above using the boom selection unit 15 of the deflection of the intersection lines of the cinema photograph by the light planes and the chord estimation unit 10. Since the change in parallax between the light source 1 and the camera 7 necessitates a change in the number of planes, deflection boom and the introduction of correction factors when calculating flatness, the parallax sensor 18 controls the operation of the number of light planes unit 14, the deflection boom selector unit 15 and the computing unit 11 From the output of the television camera 7, the video signal is fed to the amplitude limiter 8, where the multi-gradation television signal is converted into a two-gradation signal, since the semitone info The video signal in this case is unnecessary or even false, which may affect the accuracy (reliability) of the measurements.

From the output of the amplitude limiter 8, the processed video signal enters the video registering unit 9, from the screen of which the (visual) quality of the light plane number selection unit 14, the light plane formation unit 2 and the scan control unit 17 provide the required number (50-300) of light planes for further obtaining on the screen of the video recording unit 9 the moire pattern, indicating the presence and degree of deformation of the studied cinema photo material.

Claims (1)

Invention Formula A device for determining deformations of cinema photographs containing a cassette for cinema photographs, a light source, a computing unit, the output of which the flatness assessment of cinema photographs 5 is connected to the flatness detection unit. as well as to the input of the chord estimation unit 10, which determines the length of the measured portion of the television sweep line (Fig. 2), necessary for the subsequent determination characterized in that in order to increase accuracy by ensuring the determination of local deformations and speeding up the flatness measurement process, the device flatness. The output of the chord evaluation unit 10 is the light plane formation unit, the first and second spectrum converters, the television camera, the amplitude limiter, the video recording unit, the chord estimation unit, the light plane wobble unit, the light number selection unit. goes to the device 12 of the registration of planes-25 planes, the block selection of the deflection, a mode selection unit, a scan control unit and a parallax sensor, the light source through the series-connected light-plane formation unit, the first spectrum converter, is connected to the input of the computing unit 11, in which the flatness measurement process of the studied photographic material is directly carried out. Information from the post-availability computing unit 11. In the mode of measuring the flatness of the exposed cinema photograph, all the above-mentioned blocks participate, however, the first 3 ,,, L1 --- g - j j ..- G and second 6 spectrum transducers can nofotomaterial and second transducer be excluded. All operations of this mode of operation of the device are the same as in the first mode of operation. The mode of determining the local deformations of a film photograph differs from the first mode of operation of the proposed device in that in this case a qualitative assessment of the parameters (deformations) of the film under investigation is carried out. The definition (analysis) for35 the spectrum is connected to the optical input of the television camera, the signal output of which is connected to the amplitude limiter, the output of which is connected to the input of the Bideodig block, the first input of the deflection boom selector unit and the first input of the chord evaluation unit, the output of block select the number of light planes connected to the input We deformities or defects in kinofotoma-40 of the wobble block of the light planes, the perterial is carried out according to the picture, the blue output of which is connected to the second entrance of the dark and light stripes (the moire of the light plan formation unit, va picture), which arise in connection with the second output of the wobble block by the light-geometric interference of several rasters, which are superimposed on each other The left ploskostei is connected to the first control input of the television camera, the peri creates a moire pattern. The analysis is the first and second inputs of the number selection block. This image allows to determine the presence and degree of deformation of the object - bends, stretch, displacement, etc. This mode of operation of the proposed device is characterized by the absence (switching off on command from the mode selection unit 16) the chord estimation unit 10, the computing unit 11, the flatness detection unit 12, the light-plane wobble unit 13, the deflection boom selection unit 15 (depending on whether it is exposed or no film first 3 and second 6 spectrum converters are respectively disconnected or connected). In this mode 50 55 the light planes are connected respectively to the first output of the mode selector and the first output of the parallax sensor, the second and third outputs of the mode selector are respectively connected to the second input of the deflection boom selector and to the first input of the sweep control unit whose output is connected to the second control input of the television camera The strain gauge output of which is connected to the first input of the parallax sensor, the second and third outputs of which are respectively connected to the control input of the computing unit third the work unit 14 for selecting the number of light planes, the light plane formation unit 2 and the scan control unit 17 provide the required number (50-300) of light planes for further obtaining a moire pattern on the screen of the video recording unit 9 indicating the presence and degree of deformation of the film material under investigation. Invention Formula A device for detecting deformations of cinema photographs, containing a cassette for cinema photographs, a light source, a computing unit, the output of which is connected to a flatness recording unit. characterized in that in order to increase accuracy by ensuring the determination of local deformations and speeding up the flatness measurement process, the device the light plane formation unit, the first and second spectrum converters, the television camera, the amplitude limiter, the video recording unit, the chord estimation unit, the light plane wobble unit, the light number selection unit are introduced five the spectrum is connected to the optical input of the television camera, the signal output of which is connected to the amplitude limiter, the output of which is connected to the input of the Bideodig block, the first input of the deflection boom selector unit and the first input of the chord evaluation unit, the output of block select the number of light planes connected to the input the output ploskostei is connected to the first control input of the television camera, the first and second inputs of the number selection block 0 five the light planes are connected respectively to the first output of the mode selector and the first output of the parallax sensor, the second and third outputs of the mode selector are respectively connected to the second input of the deflection boom selector and to the first input of the sweep control unit whose output is connected to the second control input of the television camera The strain gauge output of which is connected to the first input of the parallax sensor, the second and third outputs of which are respectively connected to the control input of the computing unit third the input of the deflection boom selection unit, the second input of the parallax sensor is connected to the strain gauge output of the light source, the synchronization output of the television camera is connected in parallel with the third input of the unit for selecting the number of light planes, the second input of the sweep control unit, the third input of the deflection boom selector and the second input block evaluation chord, the third input of which is connected to the output of the block selection boom deflection. 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