SU1264373A1 - Device for generating signal for correcting distortions of television picture - Google Patents

Description

The invention relates to a television technique and can be used in systems for automatically correcting distortions of television pictures.

The purpose of the invention is to improve the accuracy of the formation,; The drawing shows an electrical block diagram of a signal conditioning apparatus for correcting distortion of a television image.

A signal shaping device for correcting a television image contains 1 video signal, a first test table 2, a second test table 3, an optical switch 4, a generator of 5 color coordinate signals, a switch 6 of reference signals, an error signal extraction unit 7, a multiplier 8, an integrator 9, a detector 10 minimum, memory block 11, weight summing unit 12 reference signal generator 13, orthogonal signal generator 14, weight signal generator 15, synchronizer 16, register unit 17, color correction matrix 18, switch 19 video signals.

In this case, any color camera can be used as a video signal sensor 1, the first test table. 2 is made in the form of black and white stripes, changing according to a random law in both the lowercase and personnel directions; The second test table 3 is made in the form of vertical color bands containing the primary colors of the color system of the receiver, additional colors to them, black and linen areas and skin colors. The optical switch 4 together with the test tables 2 and 3 is placed in the alloscope of the video signal sensor 1 and is made in the form of a shutter controlled by an electromagnet.

The device works as follows.

In the initial state, the initial control code is recorded in all registers of the -11 memory block and the 17-register register. At the output of weight add-on block 12, the correction signals propagate only through their own channels. Three video signal color separation channels from the signal output of the sensor 1 video signal through the matrix 18 color correction is fed to the first input of the switch 19 video signals and depending on the code

control coming from the address output of the minimum detector 10, one of them passes through the switch 19 and is fed to the second input of the block 7 in the slit error signal. The first input of this unit receives a signal from the switch output 6 reference signals. At the same time, if correction of luminous or geometric distortions is carried out, then the minimum detector 10 at the address output sets a code in which the optical switch 4 connects the first test table 2 to the optical input of the video signal sensor 1, and the reference signal 6 passes the analog signal coming to its second input from the output of the generator 13 of the reference signal. Then, at 0 in the code of block 7 of the error signal, a signal is generated that carries information about the luminous and geometric distortions. When correcting color distortions, the minimum detector 10 generates a code at the address output that moves the flap of the optical switch 4 to a position at which the light flux from the first test table 2 is interrupted, and the second test table 3 is projected at 0 optical input of the video signal sensor. signals 6 commutes to the output one of the three signals of color coordinates, 5 arriving at its first input from the generator output 5 signals of color coordinates. The switching of the color coordinate signals is performed consistently with the switching of the video signals of the color separated channels by the switch 19 of the video signals. At the first input of the error signal extracting unit 7, an electrical signal of color chromaticity coordinates arrives, imex5 sec in the second test table 3, and the second input is a color-separated video signal of the channel of the same chromaticity, with the coordinates of which are compared. At the output of block 7, a color reproduction error signal 50 of one of the channels is formed. The error signal from the output of the error signal extraction block 7 is fed to the first input of the multiplier 8, to the second input of which 55 a weight signal is output from the output

Claims (1)

Generator 15 weight signal. From the output of the multiplier 8, the error signal, weighted by the raster field, is sent to integrator 9, which generates the value of the target function point for the frame, which is an integral estimate of the error signal over the raster field. The minimum detector 10 converts the voltage at the output of the integrator 9 into a digital signal and stores it. I affect the corresponding digital-to-analog converters of the color correction matrix 18 and the control codes recorded in the corresponding registers of the registers block 17, the minimum detector 10 achieves the minimum voltage generated per frame at the output of the integrator 9. This color separation is considered to be tuned. Next, the color separation of the channel on the top of the matrix 18 is performed and the corresponding color coordinates from the output of the generator 5 are connected. The integral error of the color error of this channel is minimized. The third color separation channel is tuned in the same way. The outputs of the matrix 18 color correction form three outputs of three seven input adders. The corresponding video signal of the color-separated channel is fed to one input of each adder, the signals from six outputs of three paraphase amplifiers are fed to the other six signals. One output of each paraphase amplifier is connected directly to the three inputs of each adder and summed with a transfer ratio of 0.5, and the other output of each paraphase amplifier is connected to the remaining three inputs of each accumulator via a multiplier-digital-analog multiplier, which is connected to the adder unit Three digital-to-analog converters are connected to each adder. To correct color separation of the incoming adder to this adder, you need to connect the output of this adder via switch 19 to the second input of block 7 and act on the three digital-analog converters, whose outputs are connected to this adder, with control codes . In this case, the video signals of the two color-separated channels are added or subtracted in the third tunable channel. If the transfer coefficient of a digital-to-analog converter connected to the {{{tuned} channel} channel is 0.5, its interaction per channel will not lead to the compensation of video signals of different phases and one amplitude, and if different from 0.5 tr there will be either addition or subtraction. In order not to break. to sew the white balance, it is necessary to ensure that when passing through the color correction matrix 18, the transmission coefficient of the three digital-analog converters is zero. Correction of the velocity and geometric distortions of a video signal is done in a similar way by minimizing the integral estimate of the error signal. In this case, at the output of the weight summing unit 12, a weighted sum of the orthogonal signals is received, which are fed to its second input from the output of the generator 14 of the orthogonal signals. A suspension of orthogonal signals, being the correction signals, is fed to the control input of the video signal sensor 1, where the white level correction signals are multiplicatively input to the color separation channels. The black level correction signals are added additively, and the geometric distortion level correction signals are input to the deviation of the system of the corresponding color-separated channels. The synchronizer 16, controlled by the horizontal and vertical sync pulses arriving at its control input, generates the necessary pulses for the operation of the generators 14 and 15, the integrator 9 and the minimum detector 10 synchronously with the television scan. The search for the minimum of the integral evaluation of the error signal and the switching of the signals, depending on the operation mode, are performed by a program that is embedded in the permanent memory of the microprocessor included in the minimum detector 10. Invention A signal shaping device for correcting distortions of a television image, comprising a first test table, a video sensor, serially connected error signal extractor unit, multiplier, integrator, minimum detector, memory unit and weight summing unit, the output of which is connected to a control to the input a video signal sensor, a weight signal generator, the output of which is connected to the second input of a multiplier, a reference signal generator, an orthogonal signal generator, the output of which It is connected to the second input of the weight summation unit, the synchronizer, the first and second outputs of which are connected respectively to the control inputs of the integrator and the minimum detector and the third output to the control inputs of the weight signal generator and the orthogonal signal generator, while the synchronization output of the video signal sensor is connected to the control inputs of the generator of the reference signal, the generator of the weight signal, the synchronizer and the generator of orthogonal signals, and the address output of the minimum detector is connected to the address input A memory unit, characterized in that, in order to increase the shaping accuracy, an optically coupled second test table and an optical switch are introduced into it, another optical input of which is optically connected to the video signal sensor input, connected in series to a color coordinate signal generator, whose input is connected with the synchronous input of the video signal sensor, and the switch of the reference signals, the second input of which is connected to the output of the generator of the reference signal, and the output - to the first input of the block of the error signal, and serially connected block of registers, color correction matrix and video switchboard, the output of which is connected to the second input of the error signal extraction unit, while the signal output of the minimum detector is connected to the signal L4 input of the register block, and the address output with the address input of the reg1 register and control inputs switch of reference signals, switch vi. deosignals and an optical switch, and the signal output of the video signal sensor is connected to another input of the color correction matrix.