RU2551895C1 - Device for pulse image registration - Google Patents

Abstract

FIELD: radio engineering, communication.

SUBSTANCE: device for pulse image registration contains photosensitive block based on matrix of devices with charge coupling, clock-pulse generator, delay time generator, and selector of last line; and is additionally provided with block of adaptive discriminator, its input is connected to the information output of the photosensitive block, and output is information output of the device.

EFFECT: increased quality of the pulse image due to inclusion of the adaptive discriminator, which in real time analysis line video signals of the image frame as per amplitude and inclination of the peak, forms discrimination level ensuring optimal ratio of video signal amplitude and discrimination level, and ensures adaptive discrimination of the video signal.

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Description

The invention relates to television technology and can be used to register random single and impulse images in television systems based on a coordinate-sensitive matrix video detector with memory, in particular, on a matrix of charge-coupled devices.

A device for recording a pulse image that contains a photosensitive unit, a clock generator, a delay driver and a selector of the last row, the first output of the synchronizer is connected to a photosensitive unit, and the second and third outputs are connected respectively with a driver of the delay time and the first input of the selector of the last line, the first output of which is connected to the shaper of the delay time, and the second output is connected to the sync generator and the photosensitive unit, while One delay time driver is connected to the second input of the last line selector (USSR Author's Certificate No. 1354444, IPC H04N 5/30, publ. 11/23/1987, authors Dick P.A., Domoratsky E.P., Krasnyuk A.A., Kulikov N.V., Stenin V.Ya. - prototype).

A disadvantage of the known device (prototype) is the insufficiently accurate and reliable conversion of the input optical image to the output discrete electronic. This is especially critical when registering random single and pulsed images during fast-moving dynamic processes, when the loss of each video bit of primary information can lead to a significant decrease in the accuracy and reliability of control or loss of control of an object (process).

The optoelectronic conversion is undistorted when, with uniform illumination of the target of the video detector, the read line video signals throughout the image frame have the same amplitudes. If such video signals are discriminated by a constant base level, the field of the electronic image frame will also be uniform.

However, due to the technological spread of sensitivity over the field of the video detector frame, uneven illumination of its target or (and) aging, a different slope of the vertices of the horizontal and frame signals, as well as outliers along their edges, are possible. Discrimination of such video signals by a constant level leads to distortion of the input information, while a larger slope of the vertex corresponds to a smaller range of possible adjustment of the level of discrimination. With a critical ratio of the slope of the top and the amplitude of the working part of the video signal at any constant level of discrimination, a complete loss of the source information occurs.

The technical problem to which the claimed invention is directed is to improve the quality (accuracy and reliability) of a pulsed image by forming in real time an adaptive (tracking) level of discrimination of lowercase video signals.

The stated technical problem is solved in that the device for recording a pulse image containing a photosensitive unit on a matrix of devices with charge coupling, a sync generator, a delay time driver and a selector of the last line, according to the proposed invention, is additionally equipped with an adaptive discriminator unit, the input of which is connected to the information output of the photosensitive unit , and the output is the information output of the device.

The adaptive discriminator unit contains a high-pass filter, an analog-to-digital converter, a basic discrimination level adjuster, two registers, two arithmetic-logic devices, a counter, a converter and a comparator, while the output of the high-pass filter is connected to the input of the analog-to-digital converter, the output of which is connected with the information inputs of the registers and the first input of the comparator, the information output of the first register is connected to the first inputs of the arithmetic-logical devices, and the information the second output of the second register is connected to the second input of the second arithmetic-logic device, the information output of the master of the basic level of discrimination is connected to the second input of the first arithmetic-logical device, the information output of which is connected to the first input of the counter, the second input of which is connected to the first output of the second arithmetic-logical devices, the second output of which is connected to the first input of the converter, the second input of which is connected to the first output of the clock, the second and third outputs of which They are connected respectively to the second inputs of the registers, and the fourth output is connected to the third input of the counter, the fourth input of which is connected to the output of the converter, and the information output is connected to the second input of the comparator

The technical result, the achievement of which is ensured by the implementation of the entire claimed set of essential features, is to improve the quality (accuracy and reliability) of the pulse image by introducing an adaptive discriminator into the device, which in real time analyzes the line video signals of the image frame by amplitude and slope of the vertex, forms the level of discrimination, providing the optimal ratio of the amplitude of the video signal to the level of discrimination and implements the actual adaptive (trace conductive) discriminating the video signal.

The essence of the invention is illustrated by drawings, where

in FIG. 1 shows a structural electrical diagram of a device for recording a pulse image (the dotted line shows the connection of the prototype);

in FIG. 2 is a functional electrical diagram of an adaptive discriminator unit;

in FIG. 3 - time diagrams of the operation of the device.

The device (Fig. 1) contains a photosensitive unit 1 on a charge-coupled device array, a sync generator 2, a delay time driver 3, a last line selector 4, an adaptive discriminator 5 unit.

The adaptive discriminator block 5 is intended for analyzing lowercase video signals of the image frame in amplitude and slope of the vertex, forming a discrimination level that provides the optimal ratio of the amplitude of the video signal to the discrimination level, and real-time adaptive (tracking) discrimination of the video signal in real time. Since the video signals of adjacent lines in the working area of the frame practically do not differ in tilt angle and amplitude, the determination of the current values of the level of discrimination of lowercase video signals is based on a recursive principle.

The adaptive discriminator block 5 (Fig. 2) contains a high-pass filter (HFF), an analog-to-digital converter (ADC), a basic discrimination level adjuster (Set C), two registers (WP1) and (WP2), two arithmetic-logic devices ( ALU1) and (ALU2), a counter (ST), a converter (τ), a comparator (K), while the output of a high-pass filter (HFF) is connected to the input of an analog-to-digital converter (ADC), the output of which is connected to the information inputs of D registers (WG1) and (WG2) and the first input of the comparator (K), the information output Q of the first register (WG1) connected to the first inputs A of the arithmetic logic devices (ALU1) and (ALU2), and the information output Q of the second register (WP2) is connected to the second input B of the second arithmetic logic device (ALU2), the information output C of the setpoint discriminator (Set. C) is connected to the second input C of the first arithmetic logic device (ALU1), the information output of which is connected to the first input D of the counter (ST), the second input "± 1" of which is connected to the first output of the second arithmetic logic device (ALU2), the second whose output is is dined with the first input of the converter (τ), the second input of which T is connected to the first output of the clock generator, the second "G1C" and the third "G2C" outputs of which are connected respectively to the second inputs of the registers (RG1) and (RG2), and the fourth output is "SSI "connected to the third input V of the counter (CT), the fourth input C of which is connected to the output τ of the converter (τ), and the information output Q is connected to the second input of the comparator (K).

The device operates as follows (Fig. 1 - Fig. 3). The signal coming from the photosensitive unit, passing through a high-pass filter (HFF), is converted to digital form using a high-frequency analog-to-digital converter (ADC) and fed to the registers (РГ1) and (РГ2). Recording in the registers of the current signal value is carried out by pulses of conditional line boundaries PS and G2C coming from the clock. PS pulses are formed at the beginning of lines, where there is no outlier, but there should not be information yet, and G2C pulses at the end of lines, where there should already be no information, but there is no outlier. As a result, the number A corresponding to the signal level at the beginning of the lines is formed at the output of the register (WG1), and the number B corresponding to the signal level at the end of the lines is formed at the output of the register (WG1). The arithmetic-logic device (ALU1) subtracts from the number A the constant C coming from the master of the basic level of discrimination (Set C), with the help of which the required level of discrimination is established. The arithmetic logic device (ALU2) generates an AB difference, characterizing the slope of the line signal, and the sign determines the direction of the slope. A code with the necessary law of its change during the line is generated at the output of the counter (ST):

N (t) = A-C-t / τ,

where t is the current time of the line, τ = T / (A-B) is the sequence of pulses coming from the converter (τ) to the counter input counter (CT), depending on the difference A-B; T is the reference period of the pulses arriving at the input of the Converter (τ) from the clock. In the intervals between the lines on the counter (ST), the number N (t = 0) = A-C is set by the SSI line synchronization pulses. If (A-B)> 0, then at the input "± 1" the level is set at which the counter (ST) works in the subtraction mode, if (A-B) <0, then at this input the level at which the counter ( ST) works in addition mode. Pulses with a repetition period, which depends inversely on the difference (A-B), are supplied to its counting input C from the converter (τ). The division operation is carried out by the converter (τ). The N (t) code from the counter (CT) corresponding to the tracking level, and the signal code from the analog-to-digital converter (ADC) are sent to the comparator (K), at the output of which the required discriminated video signal is generated.

The invention can be used to register random single and impulse images in TV systems based on a coordinate-sensitive matrix video detector with memory, in particular, on a matrix of charge-coupled devices.

Claims (1)

A pulse image recording device comprising a photosensitive unit on a charge-coupled device array, a synchro generator, a delay shaper and a last-line selector, characterized in that it is additionally equipped with an adaptive discriminator unit, the input of which is connected to the information output of the photosensitive unit, and the output is an information output of the device wherein the adaptive discriminator unit contains a high-pass filter, an analog-to-digital converter, a base unit discrimination level, two registers, two arithmetic-logic devices, a counter, a converter and a comparator, while the output of the high-pass filter is connected to the input of an analog-to-digital converter, the output of which is connected to the information inputs of the registers and the first input of the comparator, the information output of the first register is connected to the first the inputs of the arithmetic-logical devices, and the information output of the second register is connected to the second input of the second arithmetic-logical device, the information output of the master basic discrimination level is connected to the second input of the first arithmetic logic device, the information output of which is connected to the first input of the counter, the second input of which is connected to the first output of the second arithmetic logic device, the second output of which is connected to the first input of the converter, the second input of which is connected to the first the output of the clock, the second and third outputs of which are connected respectively to the second inputs of the registers, and the fourth output is connected to the third input of the counter, the fourth input d is connected to output transducer, and an information output is connected to the second input of the comparator.

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