SU1656696A1 - Device for formation of picture signal - Google Patents

Abstract

The invention relates to television technology. The purpose of the invention is to increase the signal-to-noise ratio when forming the image signal of local contrasts. The image signal forming device comprises an exposure unit 1, a matrix of 2 devices with charge coupling consisting of an accumulation section 2-1, a memory section 2-2, a first register 23 and a second register 2-4, three converters 3, 4 and 12 signal levels, a synchronizing generator 5, a video amplifier 6, a pulse duration counting unit 7, two formers 8 and 10 signals, a gating unit 9 and a subtractor 11. The goal is achieved by eliminating a quantization error, since high-frequency filtering is carried out in analog form directly in matrix 2. The device according to claim. 2-5 of the formula differs in the implementation of the shaper 8. block 9, block 7 and shaper 10. 4 Cp f-crystals, 5 ill.

Description

The invention relates to television technology and can be used in image signal forming devices in which arrays of a charge-coupled device (CCD) are used as video signal sensors.

The purpose of the invention is to increase the signal-to-noise ratio.

Figure 1 shows the structural electrical circuit of the image signal forming device; Fig. 2 is an electrical circuit of the first driver; FIG. 3 is an electrical gating unit circuit; 4 is an electrical diagram of a pulse duration reference block; Fig. 5 is an electrical circuit of the second signal conditioner.

The image signal forming device comprises an exposure unit 1, a CCD array 2, an accumulation section 2-1, a memory section 2-2, a first register 2-3,

second register 2-4, first and second converters 3. 4 level signals, synchronizer 5, video amplifier 6, pulse width countdown unit 7, first shaper 8 signal, gating unit 9, second signal shaper 10, subtractor 11, third level signal converter 12 .

The first driver 8 of the signal contains the first element OR 13, the element NO 14, the second element OR 15.

Gating unit 9 contains a divider 16 into two, the first inverter 17, the first element And 18, the second element And 19, the second inverter 20, and the element NOT 21.

Block 7 of the reference pulse duration contains the imaging unit 22 pulses of the frame frequency, the first level converter 23, the first element OR 24, the imaging unit 25 horizontal frequency pulses, the second converter 26 levels, the second element OR 27.

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The second signal shaper 10 contains the first, second and third elements of NO 28, 29, 30. The first, second and third elements of AND 31, 32, 33, the first second and third elements of OR 34, 35, 36.

The imaging device operates as follows.

A frame damping impulse is supplied to the synchro generator 5 exposure unit, as a result of which the accumulation section of the CCD array 2 acts in sync with the frame damping pulses, and the optical image of the object enters the matrix accumulation section 2-1. CCD during reverse frame. and during the forward traversing of the frame, section 2-1 of the accumulation of the CCD matrix is in the dark

Control pulses from the synchronous generator 5 through the first driver 8 and the first converter 3 of the level signals are supplied to the corresponding control inputs of the accumulation matrix 2 CCD of the accumulator 5-1. After the accumulation of photocharges is completed, the transfer of the charge image from the frame 2- 1 accumulation of the CCD accumulation matrix 2 through the second register 4 of the CCD 2 matrix into section 2-2 of the memory of the CCD matrix 2. For this, during the subsequent cycle of the forward course of the frame sweep, pulse signals are sent to the accumulation section 2-1, the second register 2 4 and the memory section, transferring the frame charges line by line during the horizontal sweep after the transfer of the charge image in section 2-2 of the memory of the CCD 2, in the accumulation section of the CCD 2, a new accumulation cycle begins, and in section 2-2 of the memory of the CCD 2, vertical defocusing of the charge image stored there is formed. Control sequence cyclograms of section 2-2 of the memory of the CCD matrix are carried out from the pulse duration unit 7. Vertically and horizontally out of focus, the charge image of the frame is read line by line and element by element through the first register 2-3 of the CCD 2 matrix. At the same time, in the first register 2-3 of the CCD 2 matrix, due to the defocusing of the charges, the spectrum of the spatial frequencies narrows in relation to the video signal of a clear image

Clear video and unscrambled video

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They are received at the informational 1 clock subtraptep 11 at the output of which a differential image signal is formed, which is fed to the signal input of the video amplifier 6

B, the active part of the other half frame is carried out by the described transfer process through the first register 2-3 of the back image from the accumulation section 2-1 to the memory section 2-2, therefore, to exclude the output of the parasitic signal from the active register input 2 4 matrices 2 CCD differential signal formation must be suspended during this time. To do this, pulses are sent to the gate input of the subtractor 11, opening the subtractor 11 only during the generation of the useful differential video signal. Formation is necessary The x pulses are produced at the output of the gating unit 9. Also, the control pulses from the sync generator 5 are fed to the first register 2-3 of the CCD 2 matrix through the second signal shaper 10 and the third level signal converter 12.

In the proposed device, quantization errors are eliminated, since high-frequency filtering is performed in analog form directly in the CCD array.

Claims (5)

Invention Formula 1 An imaging device comprising an optically coupled exposure unit and an array of charge-coupled devices (CCD). the accumulation section, connected in series with the charge connection, is the memory section; —the output mode (Istra), the first and second control inputs of the memory section and the output register are connected to the corresponding outputs of the first and second level signal converters (PU ), a synchronous generator, the first, second and third outputs of which are connected respectively to the first, second and third inputs of the third PU, the video amplifier whose output is the output of the device, characterized in that, in order to increase the signal / room ratio when forming the image of local contrasts, a pulse duration counting unit, a first signal conditioner, a gating unit, a second signal conditioner, a third PU, a subtractor, and a second register in charge connection with the accumulation section and the memory section of the CCD matrix, the first, second and third the control inputs of the accumulator section of the CCD are connected to the corresponding outputs of the first control unit, the control input of which is connected to the fourth output of the synchronous generator, and the third output to the first control input of the pulse duration counting unit, the output of the frame frequency of which is connected to the third control input of the memory section the CCD matrix, the second control input of the output register is connected to the output of the horizontal frequency of the pulse width counting unit, the second control input of which is connected to the third output of the control unit. and the frame and line synchronization inputs of the duration counting unit are respectively with the fifth and sixth outputs of the sync generator, the seventh, eighth and ninth outputs of which are connected respectively to the first, second and third inputs of the accumulation section of the CCD, the gate input of which is connected to the output of the clock generator. and the outputs with the first, second and third inputs of the first PU, respectively, with the first, second and third inputs of the row of the second signal conditioner, the first, second and third inputs of the columns of which are connected respectively to the first, second and third outputs of the synchronous generator, the fifth the output of which is connected respectively to the control input of the exposure unit and the frame synchronization input of the gating unit, the horizontal synchronization input of which is connected to the sixth output of the clock generator, and the first output of the gating unit - with gating input of the signal conditioner. the second output - with a gate input of the subtractor, the third output - with the control input of the third PU, the first, second and third inputs of which are connected to the corresponding outputs of the second signal conditioner, and the outputs of the first, second and third phases corresponding control inputs of the second register of the CCD, the output of which is connected to the first information input of the subtractor, the second information input of which is connected to the output of the output register of the CCD, and the output to the information go video amplifier. 2. The device pop. 1, characterized in that the first signal conditioner contains the first element OR, the element NO and the second element OR, the first input of the first element OR allowing the input of the element NO and the first input of the second element OR are respectively the first, second third phase inputs 0 "5 0 5 0 five the first signal conditioner, interconnected second inputs of the OR elements and prohibiting the input of the NO element - the gate input of the first signal conditioner, and the outputs - the first, second and third phase outputs of the first signal conditioner, respectively. 3. The pop.h. Distinguishing device — so that the gating unit contains a divider into two and a first inverter, the inputs of which are interconnected and are the input frame synchronization of the block; the direct output of the divider into two is connected to the first input of the first And element, the second input of which is connected to the output of the first inverter and the second input of the second element I, the first input of which is connected to the inverse output of the divider into two, connected in series to the second inverter and the element NID. the second input of which is connected to the output of the first element AND, the input of the second inverter being the horizontal synchronization input of the block, and the outputs of the first AND element, the second AND element and the NAND element — the first, second and third outputs of the block respectively. 4. Pop-1 device, characterized in that the pulse duration counting unit contains a frame frequency pulse generator connected in series and a first level converter, the output of which is connected to the first input of the first OR element, the second input of which is the first control input of the block and the output is the frame frequency output of the block, a horizontal frequency pulse shaper connected in series and a second level converter, the output of which is connected to the first input of the second element OR, second in d which is the second control input unit and output - output line frequency block, the input of the pulse frame frequency is input to the frame synchronization unit and the input of line frequency pulses - input horizontal sync block, 5. Pop 1 device, characterized in that the second signal conditioner contains the first, second and third elements of NO, the resolving inputs of which are the first, second and third inputs of the second signal generator column, the first, second and third elements, respectively the first inputs of which are respectively the first, second and third inputs of the line of the second shaper the signal, interconnected prohibiting inputs of the NO elements and the second inputs of the AND elements, a gate input of the second signal conditioner, the outputs of the first, second and third elements of NO are connected respectively to the first inputs of the first, second and third OR elements, the second inputs of which are connected respectively to the outputs the first, second and third elements AND, and the outputs of the first, second and third elements OR are the first, second and third outputs of the second signal conditioner, respectively. 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