SU999170A1 - Television device for reproduction of images - Google Patents

Description

(5) TELEVISION DEVICE FOR REPRODUCTION OF IMAGE

Claims (2)

The invention relates to information technology and can be used in video playback devices (video monitoring devices, displays, monochrome and color television receivers) with enhanced clarity. A television device for reproducing images is known in which image enhancement is provided by dynamically focusing a scanning spot, comprising a receiving / amplifying unit, the first output of which is through a horizontal scanning generator, and the second output through a vertical scanning generator is connected to two inputs of a deflection system cathode ray tube. Additional outputs of the sweep generators are connected to the cathode-ray tube CO via the interface block and the scan shape control unit. The disadvantage of this device is the low image clarity. The closest technical solution to the invention is a system. for use in television receivers for the purpose of sharpening an image, comprising a receiving-amplifying unit, the first output of which is connected via a horizontal scanning generator, the second output through a vertical scanning generator is connected to two inputs of a deflection system of a cathode ray tube, and the third output is connected to the detector input image contours horizontally, and a conjugation unit connected to the first entrance of the cathode-ray tube j 21 through the control unit of the scanning spot shape unit. A disadvantage of the known devices It is a low degree of image enhancement. This is due to the fact that the major axis of the ellipse of the scanning spot can be set only in two nominal (i.e., rotations) and Board, perpendicular horizontal scanning) directions. The aim of the invention is to increase the clarity of the reproduced image by rotating the major axis of the ellipse of the scanning spot in the direction of the tangent to the reproduced contour of the image. For this, a television device containing a receiving-amplifying unit, the first output of which is through a horizontal sweep generator, the second output through a vertical sweep generator is connected to two deflection inputs of the electron-beam tube system, and the third output to the input of the image contour detector horizontals, and the interface unit connected via the shape spot control unit to the first entrance of the cathode ray tube, a vertical image detector, logical and logical arithmetic is introduced sky blocks, wherein the detector circuit outputs the image pixels horizontally and vertically detector circuits are connected respectively to first and second inputs of the logic-of arithmetic and logic units, a third output stacker amplifying unit connected to the input of the contour detector. The ditch of the image is vertically and to the third input of the logical-arithmetic unit, the output of which is connected to the second input of the cathode ray tube, and the output of the logic unit - to the input of the interface unit. FIG. 1 is a block diagram of a television device for reproducing images; in fig. 2 - one of the variants of the structural electrical circuit of the image contour detector horizontally; in fig. 3 one of the possible variants of the structural electrical circuit of the image contour detector along the vertical; in fig. k is a variant of the structural electrical circuit of the logical-arithmetic unit; in fig. 5 is an example implementation of a logic unit; in fig. 6 shows a table of information signs of a logical block, in which the corresponding positions of the image contours and the shape of the scanning spot are also indicated; in fig. 739991704 positions: horizontal voltage plots, which work in the direction of the horizontal developed device (they correspond vertically (i.e., they reproduce the contour of the image marked with x in Fig. 6). Television device for reproducing images contains a receiving / amplifying unit 1 (including a video amplifier with a clock selector in video monitoring devices of monochrome application television systems, UHF, frequency converter, IF, amplitude detector, video amplifier A spruce tree with a selector of sync pulses, as well as a sound channel with terminal devices in black and white broadcast television receivers, etc.), to the two outputs of which are connected generators 2 and 3 of horizontal and vertical sweeps, respectively, which are connected and turn to deflecting to the cathode ray tube system k. To the third output of the receiving and amplifying unit 1 are connected the detector 5 image contours of the horizontal software, the detector 6 of the image contours along the vertical and logical-logic block 7. The outputs of the detectors 6 and 5 are parallel to yucheny to the arithmetic-logic unit 7 and logic unit 8. The output of logical-arithmetical Skog unit 7 is connected to the second input of the CRT i}. The output of logic unit 8 through interface unit 9 and unit 10 controlling the shape of the scanning spot (which can be used electro-optical focusing devices, special diaphragms, etc.) is connected to the first input of the cathode ray tube C, the device operates as follows. The input information of the receiving-amplifying unit 1 on the carrier or video frequency receives the initial information, from which the lower case (Fig. 7a) and frame (not shown in Fig. 7) sync pulses, as well as the video signal with the impulses mixed in it (Fig. 7b). The horizontal and vertical sync pulses, respectively, coming from the first and second outputs of the receiving and amplifying unit 1 to the horizontal 2 generator and vertical scanning 3, provide standard image decomposition. The video signal removed from the third output of the receiver-amplifier unit 1 (Fig. 76) goes to detectors 5 and 6, and through logical-arithmetic unit 7 to the cathode-ray tube i, providing density modulation of the scanning beam. Signals taken from the output of the detector 5 image contours horizontally (Fig. 7g, 3g and from the output of the detector 6 image contours vertically (Fig. 7n, o), through logic block 8 are fed to conjugation block 9, in which a control action is generated on the scan spot shape control unit 10. With the latter, the scan spot on the screen of the cathode ray tube is shaped depending on the content of the reproduced image. For example, when played back, the signals at the outputs of the detectors 5 and 6 are missing, by In this case, the shape of the scanning spot will be circular. When reproducing the same jump in brightness (Fig. 6), signals from detectors 5 and 6 appear on some outputs (Fig. 7g, 3, n, o), with the help of which eventually This takes an ellipsoidal shape, whereby the major axis of the ellipse is set tangentially (due to this circumstance, an increase in image clarity is achieved) to the reproduced contour in the image. Obviously, the gain in image clarity obtained due to the deformation of the scanning spot shape will be all the more significant the larger the ratio between the dimensions of the undeformed (i.e., radius of the circle) and the deformed (i.e., the minor axis of the ellipse) scanning spot in direction perpendicular to the reproducible contour. To prevent possible parasitic modulation of the brightness image, the area of the scanning spot in the process of its deformation is desirable to be kept constant. If, however, a significant increase in clarity is needed and, consequently, a more significant degree of deformation of the scanning spot shape than that which can be provided by the electron-optical system of the scanning spot shape control unit 10 with unchanged .. its area, to compensate for the above modulation of brightness in the original video signal (Fig. 7b) should be mixed 70 "vat corresponding correction signal (Fig. 7n). Such mixing is carried out in the logical-arithmetic unit 7, from the input of which the signal (Fig. 7c) is fed directly to the cathode-ray tube C. Depending on the feasibility of the proposed device, the number of positions that can take the major axis of the scanning spot ellipse, choose a different one. Accordingly, the device of the detectors 5 and 6 and the logical unit 8 will be different. The horizontal detector of the image contours 5 (FIG. 2) contains in series, a differentiating device 11 (for example, a differentiating operational amplifier) and a push-pull limiter 12, the two triggers of the same type are connected to Schmidt 13 and Il (or two-way limit-amplifiers). The horizontal detector of the 5 contours of the image works as follows. At times, corresponding to the reproduction of the vertical or on; clonal contours of the image, pulses appear at the output of differentiator 11 (Fig. 7d). In the push-pull limiter 12, its central, most affected by interference, part of the received signal is cut off, the part between levels E and E. (Fig. 7d). From the first output of the push-pull limiter 12, pulses (Fig. 7d), corresponding to positive values of the derivative of the video signal (Fig. 7d), arrive at the first Schmidt trigger 13 and are converted into rectangular pulses of the FIGH. 7g) with a fixed span and duration equal to the duration of the input pulses. Similarly, the pulses from the second output of the push-pull limiters 12 (Fig. 7e), corresponding to negative values of the derivative of the video signal (Fig. 7d), go to the second Schmidt trigger C and converts it into square pulses Tfg. 7h). By using Schmidt triggers 13 and 1, the dependence of the degree of image clarity on the magnitude of the video signal is eliminated. The image contour detector 6 vertically contains a sequentially switched on differential cascade 15 to the first input of which an input of the 79991 video signal (Fig. 76) comes directly, and to the second input through the delay line 1b (Fig. 7i), and the second push-pull limiter 17 ( Fig. 7m) .5 The third and fourth Schmidt triggers 18 and 19 are connected to the two outputs of the push-pull limiter 17 (or two-way limiters will be amplified and). Differentiation of horizontal or oblique image contours in the image contour detector along vertical lines is performed by subtracting in the differential stage 15 delayed by the delay line 16 by the horizontal scanning period of the video signal (Fig. 7g) from the original video signal (Fig. 7b). Next, from the output of the differential stage 15, the received signal (Fig. 7k) goes to the second push pull stop 17, in which its central most affected part is cut between the EO and E 1 levels (Fig. 7k). The signals from its output, corresponding to the positive values of the vertical derivative of the image, are fed to the third Schmidt trigger 18 (Fig. 7l) and converted into rectangular pulses (Fig. 7n) of the same duration and fixed span. Similarly, using the fourth Schmidt trigger 19, the signals from the second output of the push-pull limiter 17 35 (Fig. 7k) corresponding to negative values of the vertical derivative of the image are converted into square pulses (Fig. 7o). Since to enhance the image clarity, the major axis of the ellipse of the scanning spot must be directed tangentially to the reproduced contour, the correspondence between the image and the required shape of the scanning spot is determined by the information values table 45 shown in FIG. 6. It shows the possible values of the signals at the inputs and the corresponding values of the signals at the outputs of the logic unit 8. The logical-arithmetic unit 7 (Fig.) Contains the OR 20 and the adder 21 connected in series. The OR 20 logical element combines the correcting pulses corresponding to horizontal, vertical and oblique contours of the reproduced image. A 70 s is shown (figs of T forms of the existence of forms of rechp leaches is V where V is where the field is equal to P) where 8 with the power of the adder 21 they are kneaded (Fig. 7b) into the original video signal. 76) by parasitic image modulation - brightness due to control of the scanning spot. A video imaging device allows for improved image clarity. So, for example, when using the scanning control unit 10 as a pair of four-pole electromagnetic lenses, the vein ratio of the major and minor axes of the scanning spot is defined by: A)) Cau + f -j.) M, M are the magnification factors of the electromagnetic lens, respectively in the directions of the major and minor axes of the scanning spot; f, f — focal distances; and the distance from the plane of the crossover of the kinescope to the median plane of the nearest lens; L is the distance from the screen plane to the median plane of the nearest lens. From formulas (1) we find | a (.Y-c) 1 .Ca + cKa + c-) c - the distance between the connected planes of four-pole electromagnetic lenses; tea, that the ratio of the large and the maize of the ellipse of the scanning spot is about Cik ± c))) Ca4C: tb) J; () J. / c () 1 g / ciuc) 1, vcucXatc UJl) J c) (). (Suppose now that the areas of the circles of the ellipsoidal scan shape are the same, (4) d is the radius of the scanning spot of a round shape; L .- small axis of the ellipse of the scanning spot of the ellipsoidal shape; 99 fcot — the large axis of the ellipse of the scanning spot of the ellipsoidal shape. Then from C) it follows: -5-G (5) / Thus, the gain in clarity obtained from the use of the proposed devices, may be V 1, times or additionally 280550 lines, which will have a very noticeable effect on the quality of the reproduced image. A television imaging device for reproducing images comprising an Orientation Amplifying Unit, the first output of which is via a horizontal scanning generator, the second output through a generator, frame scanning is connected to two inputs of a deflection system of a cathode ray tube, and the third output is connected to an input of image contour detector horizontally, and an interface unit connected via a scan spot shape control unit 010 With the first Entrance of the cathode ray tube, characterized in that, in order to increase the image spines by rotating the major axis of the ellipse of the scanning spot in the direction of the tangent to the reproduced image contour, an image contour detector along the vertical, logical and logical arithmetic units are introduced, the outputs of the image contour detector along the horizontal and the image contour detector are vertically connected to the first and the second inputs of logical-arithmetic and logical blocks, the third output of the receiving-amplifying unit is connected to the input of the image contour detector by The logic-arithmetic unit, the output of which is connected to the second input of the cathode-ray tube, and the output of the logic unit - with the input of the interface unit, were rotated to the third input. Sources of information taken into account during the examination 1. USSR author's certificate K 365856, cl . H About N 3/26, 1970. 2. US Patent No. cl. H 0 N 5 /, 1976 (prototype). At ipui.S FIG. five