SU1149436A1 - Television analyser of colour of film negative - Google Patents

Abstract

A TELEVISION COLOR ANALYZER OF NEGATIVE FILMS, containing a cathode ray tube, the input of which is connected to the output of the control unit, optically connected through an optical system in series and a film channel with a three-channel color splitter, the outputs of which are optically connected to the corresponding channel with an optical channel, which is optically connected to corresponding channels with a three-channel color splitter, which is optically connected to the corresponding channel color distributors, which are optically connected to matched color distributors that are connected to a matching color distributor and an optical filtering unit that is optically connected to the corresponding color distributors and the channel's color divider. preamplifiers, an exposure control unit, an additional output of which is connected to an ex-recorder ozisch, logarithm, gamma controller, matrix color corrector and exponential converter connected in series between the respective outputs of the photomultiplier block and the inputs of the color video monitor block, optically coupled reference positives projector, characterized in that, in order to enable any type of color analysis of any type color films by reproducibly changing color separation characteristics while maintaining the contrast of gray tones in the analysis th image and increasing the accuracy and speed tsvetoanaliza, matrix color corrector is configured as three channels, each channel contains a resistor and two blocks of chroma saturation and adjustment, with the first adjustment inputs nasptsennosti obedi- and chrominance blocks. yen with one of the channel resistor pins and correspond to the inputs of the matrix color corrector, the second input of each Saturation and chrominance adjustment block is connected to one of the two other inputs of the matrix color corrector, and their outputs are combined with another output of the channel resistor and match you (matrix matrix color corrector moves , each block of adjusting the chromaticity is made in the form of two switches mechanically interconnected, having

Description

The invention relates to professional cinematography and television, in particular to color film analyzers for color analyzers. Closest to the present, a television color analyzer of film negatives containing a cathode ray tube, the input of which is connected to the output of the control unit optically connected through sequentially arranged the optical system and the film channel with a three-channel color splitter, the outputs of which are connected via a block of corrective light filters with the corresponding photomultiplier block, preamplifier block, exposure control knobs, the secondary output of which is connected to the exposure recorder, logarithm, gamma controller, matrix color corrector and exponential converter, are connected in series between the corresponding outputs of the photomultiplier block and the color video monitor inputs block, optically coupled reference positive projector and viewing screen 01 The disadvantages of the known device The complexity of adjustment and calibration when working with different types of color negative films, the need for matrix color correctors for each type of color films used, for which there is no possibility to fine-tune them, which reduces the accuracy and quality of analysis and productivity of the color coordinator operator. the possibility of color analysis of any types of color films by reproducible changes in color separation characteristics while maintaining the contrast of gray The tones in the image are analyzed and the accuracy and speed of color analysis is increased. The goal is achieved in a television color analysis of film negatives containing an electron-beam tube, the output of which is connected to the output of the control unit is optically connected through successive optical systems and a film channel with a three-channel color splitter, the outputs of which are optically connected through a block of optical corrective optical filters. connected to the corresponding inputs of the photomultiplier block, the preamplifier block, the exposure control block, the additional output of which is connected to the exposure recorder, a logarithmator, a gamma controller, a matrix color corrector and an exponential converter, connected in series between the corresponding outputs of the photomultiplier block and the inputs of the color video control block, optically coupled reference positivestage projector, matrix color corrector made in the form of three channels , each of which contains a channel resistor and two blocks of adjusting saturation and color, with the first inputs of blocks adjust saturation and chromaticity are combined with one of the channel resistor pins and correspond to the inputs of the matrix color corrector, the second input of each saturation and chroma adjustment block is connected to one of the two other matrix corrector inputs, and their outputs are combined with another output of the channel resistor and correspond to the matrix color corrector outputs each saturation and chrominance adjustment unit is made in the form of two switches, mechanically connected to each other, having (2p + 1) outputs each, (, 2, 3, ...), the inputs of which are the inputs of the saturation and chrominance adjustment unit, and (2p + 1) resistors, some of the pins of which are combined and the output of the saturation and chrominance control unit, and the other outputs of the resistors are connected respectively to the 2-1 outputs, starting with the second, second switch and the average output of the first switch, with the 1st output of the first switch (, 2,3, ..,), except and connected to (j (2n + 1) - (i-l5 M output of the second switch, conductivity of all blocks of saturation and chroma adjustment at all positions of ne The switches are the same. FIG. 1 shows a structural optical-electrical circuit of a television color analyzer; Fig. 2 is a structural electrical circuit of a matrix color corrector; in fig. 3 is the electrical circuit diagram of the adjustment of color and chromaticity. The television color analyzer contains a cathode-ray tube 1, control block 2, optical system 3, film channel 4 for negative 5, three-channel color splitter 6, block 7 corrective optical filters, block 8 of photoelectronic photomultipliers forming three video channels, block 9 preamplifiers, block 10 controllers of expo- sition, logarithmator 11, regulator 12 gamma, matrix color corrector 13, exponential converter 14, color video control unit 1 recorder 16 exposure with punched tape 17, overhead projector 18 reference positive 19, viewing screen 20; matrix color corrector 13 contains input buses 21–23, output buses 24–26 for red, green, and blue color separation channels, respectively, six blocks 27–32 of saturation regulators, and chromaticity, channel resistors 33–3, first inputs 36–41 blocks 27- 32, respectively, the second inputs 42-47 of blocks 27-32, respectively, the outputs 48-53 of blocks 27-32, respectively, the first and second switches 54-1 and 54-2, 2 +1 resistors 55., Television color analyzer works as follows. The negative 5 is inserted into the movie channel 4, the reference positive 19 is charged into the slide projector 18. A color analyzer and a slide projector are switched on. The cathode ray tube 1, connected to the control unit 2, crawls negative 5 with a running spot through the optical system 3 in the television standard. Light modulated by negative 5 enters the input of a three-channel color separator 6, in which a system of dichroic mirrors splits into three color components — red, green, and blue — to form three direct color-separated channels. Further, each color component is through block 7 of the corg. optical filters optimizing the spectral characteristics of each of the direct color-separation channels are fed to the optical inputs of the corresponding photomultipliers of block 8. From the outputs of block 8 of photoelectronic JT Housing, color-separated video signals of the analyzed 5 negative elements 5 are removed, through block 9 of preamplifiers intended for correction the afterglow of the phosphor of the cathode ray tube 1, is fed to the block 10 of the exposure controllers. Exposure controllers 10 provide step attenuation in each of the three forward color separation channels of video signals in accordance with the exposure steps. The unit 10 attenuators are calibrated in units corresponding to the Pepexo Ca ratio from one light number to another when the exposure is switched by the passport mechanism in a copy machine (not shown) (control range from -9 to +55 light numbers). These values are fully consistent with the calibration of passport mechanisms of film copiers. The output of the block 10 is connected to the inputs of the logarithm 11, representing an electrical analogue of the relationship between the value of optical density and film exposure. The outputs of the logarithm 11 are connected to the inputs of the gamma controller 12, which provides calibration of a television color analyzer for various types of emulsions and various modes of chemical photographic processing. Video output signals after logarithm correspond to the color signals of the additive motion picture transmission system, equivalent to showing a positive on a movie screen. The logarithm process in the logarithm 11 is necessary for carrying out the subsequent correction and calibration of a television color analyzer on negative films of different types and having different color separation characteristics, both during the transition from one type of film to another, and during the transition, from one batch (axis) to another for one type of film. For this calibration, a matrix color corrector 13 is used, the inputs of which are connected to the outputs of the gamma controller 12, which form the three direct colors of other channels — red, green, and blue. Calibration and correction of the TV color analyzer in order to compensate for the harmful (side) absorption of negative film dye dyes. Test the image as follows. Transmitters 54 and 54-2 of blocks 27-32 are set to position a (FIG. 3), while on the screen of the color video monitor unit 15 there is a color kin image of negative 5 in positive with a maximum saturation of color. In this case, to the channel resistor 33 Resistor R of block 28 is connected: input bus 21 of matrix color corrector, input 37 of block 28, contact a of first switch 54, output 49 of block 28, output bus 27 Input bus 22 (green channel) in position a of second switch 54-2 is turned off (FIG. 3) Dunn matrix matrix color corrector ealizuet following matrix transformation: t-8, -8l So l-8n-8 o specific effective PLO NOSTA one (i) in a different color (s); k - red; 3 - green; c - blue; g - blue; n - purple; g - yellow. According to formula (1), the matrix color corrector ensures that the coefficients of the adjustment S fif t PfCtC matrix1 Ц, 8, Ц, 6, 6, un are relative to each other, with any output switches on each output of the matrix color corrector 13 (output tires 24-26) remain constant. Since the color photographic film image of the reference positive 19 on the prospective (reflective) screen 20 does not match the color and saturation of the image on the screen of the color video monitor unit 15, then with; The first and second switches 54-1 and 54-2 of blocks 27-32, which set the values of harmful absorption of dyes, can sequentially (discretely) reduce or increase the saturation and chromaticity of the negative television image to the required level, achieving a visual identity of the photographic image of the e-tal positive 19 and the television simulated test image of negative 5. These differences are explained by the harmful absorption of color film cage dyes in adjacent areas, since in the ideal case blue colors Spruce should create the desired regulated density only in the red region of the spectrum, magenta in green, and seltiya in blue. In the real case, the dyes create harmful densities in adjacent layers, and therefore the use of a matrix color corrector is proposed to optimally compensate for the harmful absorption of dyes in the layers and to optimally calibrate a television color analyzer for a specific color negative film of any type. In position b (Fig. 3) of the first and second switches 54-1 and 54-2 in parallel with the resistor 33 a resistor R2 of the saturation and chromaticity adjustment unit is connected via a circuit: input bus 21 (red channel), input 37 of block 28, contact b of the first switch 54-1, resistor R2, output 49 of block 28, output bus 24 (red channel) and resistor R11 of block 28 along the circuit (fig 3): input bus 22 (green channel) second input 43 of block 28, cocktail b of second switch 54 -2, resistor R11 of block 28, output 49 of block 28, output bus 24 (red channel). Thus, the resulting signal on the output bus 24 (red channel) is obtained by algebraically adding the input signal from bus 21 (red channel) and input signal from bus 22 (green channel) in a ratio determined by the ratio of the values of resistors R2 and R11. At the same time, in each subsequent position c, d, d, e, g, 3, and k, l, (fig 3) of the first switch 54-1 of block 28 (from the first to the last), which corresponds to the positions c, d Well, e, g, 3 °, and, k, l of the second switch 54-2, the harmful component of the green channel in the resultant signal on the output bus 24 (red channel) will increase and the useful component will be input bus. 21 (red channel) will correspondingly decrease by the same amount, reaching in the limit the ratio of the components 1: 1, which corresponds to a fully blackened image. aging. The value of the signal on the output bus 24 is always constant. Similarly, each of the six saturation and chrominance adjustment blocks of the matrix color corrector 13 works, with the optimal choice of the positions of the first and second switches 54-1 and 54-2 blocks; Cove 27-32 of the matrix color corrector 13 achieves accurate colorimetric equality for a large group colors, determined by the color gamut of the applied systems of color synthesis (photosensitive layers of color film, dichroic mirrors system of color analyzer, color phosphors of the kinescope). When all switches are switched at the same time, the TV image of Negative 5 will discretely go through all the stages, starting from the most saturated in color to the fully blackened achromatic. Compared the obtained series of television images with the positive standard obtained on different types of photographic materials, it is possible with a high degree of accuracy to determine such switch positions in which the television image on the color screen of the control unit 15 most accurately simulates the harmful (side) absorption of dyes (position data is tabulated). Since the total conductivity of all six variators 27-32 does not change, such a transition does not require additional adjustment of the gradation characteristics of the television color analyzer and the contrast of the resulting image remains constant at any position of the switches. Due to the discrete variation of matrix coefficients, the transition from one type of photographic material used to. 6 "another does not require additional selection of matrix resistors and is accomplished by setting the switches to predetermined positions (from the table), which is the significant difference between the proposed matrix color corrector and the known ones. This completes the calibration of the television color analyzer to the specific type of color negative film used; From the output of the matrix color corrector 13, the video signals are fed to the inputs of the exponential converter 14, it serves to compensate for the signal transmission characteristics of the electronic color kinescope projectors, with the result that the signal characteristic — the light of the color video monitor unit 15 — becomes almost linear, i.e. corresponding projection system of the movie image on the projection screen. The output of the exponential transducer 14 is connected to the input of the color video monitor unit 15. Upon completion of the calibration and adjustment, the operator (not shown) goes to work on the television two-analyzer. To do this, a cut-out of the reference positive 9 of a specific film plan is inserted into the overhead projector 18, the overhead projector 18 is turned on, and a positive reference image is observed on the viewing screen 20. Cutting negative 5 of the same plan is inserted into the film channel 4 of the color analyzer, and a color positive image is observed on the screen of the color video monitor unit 15, which, as a rule, does not match the reference positive image on the viewing screen 20. Change the position of the control unit 10 exposure, i.e. By changing the proportion of each color in the image on the screen of the color video monitor unit 15, the operator obtains the full visual identity of the two images of the reference and simulated ones. The cadre exposure control block 10 is discrete and has 64 positions. Having completed the simulation, the operator switches on the exposure recorder, for example, a perforator, connected to the outputs of the block 10 exposure controllers, and receives a punched tape 17 - a light passport, which is

It is used to switch the light when printing in a copy machine when switching from one plan to another (it controls the work of the passport mechanism).

The use of the proposed matrix color corrector as part of television color analyzers at film studios and film copy factories drastically reduces the setting time. 943610

ki and calibration of color analyzers, increases the productivity of the light sorter, eliminates the need to select and implement a separate matrix scheme dp of each type of color film used, and also allows the use of television color analyzers dp to obtain special color effects for photo and film printing.

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Claims (1)

TELEVISION COLOR ANALYSIS '·' TOR OF FILM NEGATIVES, containing a cathode ray tube, the input of which is connected to the output of the control unit, optically coupled through a sequentially arranged optical system and a film channel with a three-channel color splitter, the outputs of which are optically connected through the block of corrective optical filters to the corresponding inputs of the photoelectric block multipliers, a block of preamplifiers, a block of exposure controllers, the additional output of which is connected to the exposure recorder and, a logarithm, a gamma regulator, a matrix color corrector, and an exponential converter, connected in series between the corresponding outputs of the photomultiplier unit and the inputs of the color video control unit, optically coupled overhead projectors of the reference positive and a viewing screen, characterized in that, in order to allow color analysis of any type of color films by reproducibly changing color separation characteristics while maintaining the contrast of gray tones in the analyzed image and to improve the accuracy and speed of color analysis, the matrix color corrector is made in the form of three channels, each of which contains a channel resistor and two blocks for adjusting the saturation and color, the first inputs of the blocks for adjusting the saturation and color of the unit, one yen with one of the outputs of the channel resistor and correspond to the inputs of the matrix color corrector, the second input of each saturation and color adjustment block is connected to one of the two other inputs of the matrix color corrector, and their outputs are combined with the other output house of the channel resistor and correspond to the outputs of the matrix color corrector, and each unit for adjusting the color consistency is made in the form of two switches, mechanically interconnected, having (2n + 1) outputs each (n = 1,2,3, ...) ,> the inputs of which are the inputs of the saturation and chroma control unit ^ ', and (2n + 1) resistors, some of which are combined and are the output of the saturation and color control, and the other resistors are connected to 2 η outputs, respectively, starting from the second, second switch For the average output of the first switch, the i-th output of the first switch (1 = 1,2,3, ...), except for i = 2n + 1 and i =? n + 1, is connected to [(2n + 1 ) - (i-1) J = M by the output of the second switch, the conductivity of all blocks for adjusting the saturation and color for all; the positions of the switches are the same. tep “ns <1149436 2