SU1483673A1 - Image signal generator - Google Patents

Abstract

The invention relates to television. The purpose of the invention is to improve the quality of the generated image signal. The device contains a photosensitive array 1 of devices with charge coupling, consisting of accumulation section 2, memory section 3 and output register 4, clock generator 5, shift register 6, subtraction unit 7, video control unit 8, averaging unit 9, gates 10, stop channels 11, constant voltage source 12, r-r 13 rectangular pulses, ele-t OR 14, delay block 15, r-r 16 nanosecond pulses, and inverter 17. The goal is achieved by increasing the contrast of the signal of small-sized image details. In this case, the device provides for smooth adjustment of the vertical defocusing and sliding defocusing horizontally. 2 Il.

Description

The invention relates to a technique of television and can be used to generate image signals.

The purpose of the invention is to improve the quality of the formed image signal by increasing the contrast of the signal of small-sized image details.

Figure 1 is an electrical block diagram of the device; 2, time diagrams of the device operation.

The device contains (Fig. 1) a sensor-sensitive sensor array 1 with a charge coupling (CCD) consisting of accumulation section 2, memory section 3 and output register 4, synchronous generator 5, shift register 6, subtraction unit 7 , video control unit 8, averaging unit 9, shutters 10, stop channels 11, constant voltage source 12, generator of rectangular pulses 13, element OR 14, delay block 15, generator of nanosecond pulses, inverter 17.

The device works as follows.

The photosensitive matrix 1, consisting of accumulation section 2, memory section 3 and output register 4, under the action of a sequence of pulses generated by the synchronizer 5, converts the image projected on the accumulation section 2 into an image signal (for example, with uniform illumination of the accumulation section 2, the image signal can be represented as in Fig. 2a), which from the output of the output register 4 is fed to the second input of the subtraction unit 7 and to the information input of the shift register 6. Defocused horizontally and vertically (which is equivalent to performing low-pass filtering) the image signal (Fig. 2g) from the output of the shift register 6 under the action of sequences of pulses generated by the synchronous generator 5 and input to the inputs of the first, second and third phases of the shift register 6 ( Fig. 26, c, d), enters

0

5 0 5

0 $ 0

0

operations of controlled two-dimensional high-pass filtering, which leads to an increase in the contrast of the image obtained in the video monitor unit 8, which is synchronized from the first output of the synchronous generator 5.

Unlike the prototype, where the image signal is distorted in the shift register 6 at the time of the horizontal defocusing pulse is proportional to the spread of the gate capacities, the described device provides, using the block 15, the generator delay 16 nano-second pulses, the inverter 17 and the OR element 14 feeds the sliding impulses defocusing horizontally (Fig. 2c) in shift register 6 after each shift of charge packets, and not after the input of each line of the image, as in the prototype. In this case, a short pulse of sliding defocus horizontally is fed through the inverter 17 to the input of the recording of the shift register 6. As a result, information on the shift register 6 is prohibited for the duration of this pulse. The pulse from the generator output of 16 nanosecond pulses is fed through the OR element 14 to the input of the second phase of the shift register 6 at the moment of coincidence of its two other phase pulses (Fig. 26, c, d). As a result, under all the gates of the shift register 6 for the duration of the sliding defocus pulse horizontally form a common potential, which causes undirected short-term spreading of the charge packets along the shift register 6. At the same time, compared to the prototype, the horizontal defocusing pulse duration is reduced to 1-20 no, i.e. approximately n times, where n is the number of bits of the shift register (n i 232).

The total time of defocusing horizontally in this device tp1 and in the prototype t p are the same:

to the first input of the subtracting unit 7, where it is subtracted from the signal of the original image (Fig. 2a) supplied to the second input of the subtracting unit 7; This is equivalent to

t. t

Pi RM

+ t

RM

+ ... + t

P f, n CPI

where t pf | n is the defocus pulse duration after each shift of charge packets.

Thus, a simultaneous movement of the signal in shift register 6 and its successive sliding defocusing is performed. Each of the signal samples is sequentially defocused on each of the containers, regardless of the sample number. The potentials under the gates of the shift register 6 after sliding defocus across the input image signal (FIG. 2a) are shown in FIG. 2nd. In this case, the distortion of the input image signal (Fig. 2a) during its horizontal defocusing in shift register 6, caused by the spread of the gate capacities, does not occur (Figo 2g).

The operation of the device in the implementation of vertical defocusing is similar to the prototype. During the next horizontal quenching pulse, a generator 13 is triggered from the seventh output of the synchronizing generator 5, which generates a vertical defocusing pulse on the first group of inputs, in which the gates 10 of the first phase of the averaging unit 9 are combined. In this case, under the action of the voltage from the output of the source 12 under the gates 10 of the second phase, combined into the second group of inputs of the averaging block 9, potential we are created in which the charge can be stored during the half-frame of the television image. Potential we formed under the gates 10 of the first phase formed by the action of defocus pulses serve as channels for the non-directional parallel exchange of charges between the potential masses under the gates of shift register 6 and the potential masses under the gates 10 of the second phase of the averaging block 9. Each stage of the shift of the shift register 6 has its own we are potential under the closures 10, which are separated from the potential of other delay stages by the stop channels 11. As a result, the K-th stage of the shift register 6 exchanges t lko with the same name (K-E) potential below the gate 10 Mami.

The device provides for smooth adjustment of vertical defocusing and sliding defocusing horizontally by varying the pulse duration, forming 10

15

20

25

36736

Claims (1)

Three generators are 13 and 16 respectively. Invention Formula An image signal forming device comprising a photosensitive array of charge-coupled devices (CCD) consisting of an accumulation section, a memory section and an output register, a shift register connected in series, the information input of which is connected to the output of the output CCD photosensitive matrix, the subtraction unit , the second input of which is combined with the information input of the shift register, and the video control unit, the synchronization input of which is connected to the first output of the clock generator, the second and tr the third outputs of which are connected respectively to the inputs of the accumulation section and the memory section of the CCD photosensitive matrix; the fourth, fifth and sixth outputs of the sync generator are connected respectively to the inputs of the first, second and third phases of the output CCD photosensitive register; a generator of rectangular pulses, the output of which is connected to the first group of inputs of the averaging unit, the second group of inputs of which is connected to a source of constant voltage, and the outputs of the unit 35, the averaging is connected to the inputs of the shift register, the OR element, the first input of which is connected to the input of the second bus phase of the output register of the CCD photosensitive matrix, and the output of the OR element is connected to the input. The second phase of the shift register bus, characterized in that, in order to improve the quality of the generated image signal by increasing the contrast of the signal of small-sized image details, sequentially connected delay block, a nanosecond pulse generator and an inverter are introduced, the output of which 0 is connected to the resolution input of the recording of the shift register, the input of the delay unit is combined with the input of the first phase of the output register of the photosensitive CCD, the inputs of the first and 5 of the third phase of which is combined respectively with the inputs of the first and third phases of the shift register, and the second input of the OR element is combined with the input of the inverter. thirty 40 gsh about gshnshashp one D P l one