SU1246408A1 - Device for raster reproducing of half-tone original copy - Google Patents

Description

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1, a detail signal Igradxl or a signal of the modulus of the reflection coefficient of the original is formed (Fig. 56). In the simplest case, driver 1 can be made as a series-connected differentiating cascade and signal selector with two outputs, one of which is through an inverter and the other is directly connected to the input of the adder, in this case the output signal of driver 1 is one-dimensional ( the direction of the line scan) the gradient of the reflection coefficient. If shaper 1 generates a spatial gradient of the reflection coefficient signal, it is calculated as the sum of the differences of all neighboring optical density samples taken with different weighting coefficients of the moduli located within the zone, the boundaries of which are determined by the coarsest of the selected sampling steps. the differences in this sum are set inversely proportional to the distance from the center of the zone to the segments connecting the centers of the sites from which the samples included in these differences are taken. In this case, the input 4) of the Ormirator 1 in parallel receives video signals from the original sections located adjacent to the main element to be analyzed. The source of such signals can be, for example, a matrix of photodiodes. The signal is then fed to the input of the two-sided limiter 3, the level of which limits from below corresponds to the first threshold value (threshold) of the detail signal, and the level of restrictions from above to the m-th, in this case the fourth threshold of this signal (Fig. 58). The thresholds for triggering the comparators 13 of block 2 correspond to an intermediate between the first and the nth, in this case, the second and third thresholds of the signal.

If the detail signal does not exceed the first, and even more so the second threshold, then the output of the inverter 14, which is the first output of block 2, takes place at the signal of logical 1, and the remaining outputs are ignored by logical O. The output of the two-way limiter 3 stops at the second the input of the first block 4 subtraction. Since the detail signal does not exceed the first threshold, then the voltage at this input of the first block 4 subtracts the voltage to the level of the first threshold. 5 As a result, the signal level y at the output of the first block 4 is equal to zero (sections a in Fig. 5b).

Then the signal goes to the second input of block 5, multiplied by the first

o the input of which receives the video signal X, and the signal at the output of which is zero (Fig.52). At the output of the second subtractor 6, the signal is x (FIG. 53). Zero value of the xy signal from the output

5 block 5 also goes to informational inputs 2K-X (even keys 16 of block 7), and the x-xy signal, equal to x in this case, goes to information inputs (2K-1) -x (odd)

Q keys 16; The control inputs of the keys 16 receive signals from the outputs of the switch unit 12. In this case, when the detail signal of the non-first threshold, which corresponds to the low frequencies (background) of the image, the signal 1 from the first output of block 2 through the elements 22 of block 12 includes pulse sequences corresponding to the structures (Fig. 4a , 3) and unlocking the first two keys 16. The remaining keys 16 are locked by the level O, coming from the switches 12 to their inputs. Since the level of the xy signal at the information input of the second key 16 is zero, the output signal is present only at the output of the first key 16. As a result, the output of the adder 8 produces pulses with amplitude X and the following frequency, corresponding to the structure (Fig.Aa), which has the smallest spatial frequency and provides the widest range of changes in the relative area of printable and whitespace

5 elements, and therefore, the density interval of the background part and the contrast of the image as a whole.

0

Depending on the polarity of the video signal x (positive, negative) in block 9 of the recording, photographic material is exposed, the raster points of which are images of printing or blank elements of the printing form and polygraphic print obtained from this photo form during the subsequent process. . The amplitude of the video pulses coming from the output

adder 8 to the control electrode of the CRT unit 18, determines the cross-sectional area of the beam in the plane of the CRT screen and, accordingly, the size of the exposure light spot, which serves as a raster dot projected by the lens onto the photographic material of the cylinder 17. The duration of the water pulse determines the exposure time of the photoflow, and the position of the pulse in time - the coordinates of the exposed raster point on the image.

If the detail signal jgradxl exceeds the first, but does not exceed the second threshold, then the value of y at the output of the first block 4 is equal to the excess of the detail signal over the first threshold. At the same time, at the output of block 5 there is a signal xy, equal to the part of the video signal proportional to the level of exceeding the signal of detail above the threshold. At the output of the second subtraction unit 6, a signal x-xy is formed, and the adder 8, via the keys 15, receives pulses with an amplitude xy corresponding to the additionally entered points, i.e., the structure (FIG. 43). When entering through the first key 16, the video pulses of the structure (Fig. 4a) have a correspondingly reduced amplitude.

In the photo material in this case, a structure of the type is formed (Fig. 4a, 5) which is the result of the addition of the structures (Fig. 4a, 8). At the same time, the playback resolution and the clarity of the copy are increased.

The relative area of points in the structure (Fig.46) is proportional to the amplitude of the video signal, as (x-xy). With a small signal exceeding the detail of the first threshold, i.e. with a small value of y, the reflection coefficient of the original is displayed mainly by the points of the structure (Fig. 4q), since in this case x-xy xy. The parameters of block 5 are chosen so that the signal y corresponds to a multiplication of the signal, x by .0.5. Therefore, when the magnitude of the Zlizk detail signal to the subsequent one, in this case to the second threshold, is x-xy s; xy, the areas of points set on the bars of the structure (Fig. 4q) are equal to the areas of the points of the structure (Fig.49). This ensures the gradual introduction of new structure points between the points of the old structure 5 when the signal changes slowly.

Igradxl, occurring for degenerating or gradually increasing contours.

When a signal exceeds detail Igradxl of an intermediate, for example, second threshold, signal 1 is present at the second output of block 2, and other outputs O are present at the output. At the same time, from the outputs of the third and fourth electrons

5 cops 22 of the switch unit 12, the control inputs of the third and fourth keys receive impulses of the structures, respectively (Fig. 4S, e). On the information input of the fourth key

0 16 receives a signal xy from the output of block 5, and the information input of the third key 16 receives a signal x-xy from the output of the second block b.

Since the structures (Fig. 45, e) have twice the number of dots than the structures (Figs. 4o, 9), with its scaling dimensions, it is reduced by a factor of 2. When the signal exceeds the third

0 threshold signal 1 goes to the third output of block 2 and through the fifth and sixth elements 22 of the switch block 12 unlocks the fifth and sixth keys 16, and the exposure of raster points

C is based on the readings of the structure (FIG. 4d) formed by the imposition of structures (FIG. 4B, g). The new twofold increase in the number of points is compensated by scaling the resistors w of the adder 8, the transmission coefficient of which is even half as much. I

When the signal exceeds the threshold p-o threshold, which corresponds to the contours and fine details of high contrast, textures, etc., a constant level corresponding to the p-th threshold takes place at the output of the two-sided limiter 3. The level of the nth threshold enters the second input of the first

0 of block 4. Signal 1 from the last output of block 2 is converted in the first block 4 to a voltage level corresponding to the (n-1) th threshold. As a result, the output of the first block 4 forms a signal with an excess y, always corresponding to the difference between the nth and (n-1) th threshold, therefore, and after the last two keys 16, to sum5

 Matrix 8 receives pulse sequences of equal amplitude corresponding to the structures (й, L, x). As a result, a total structure is formed (fig. 4d), providing the highest resolution.

The pulse shaper 11 is built and operates in such a way that its first (top in FIG. 2) link gives pulse sequences to form structures (FIG. 4a, 5), and the addition of each subsequent link increases the number of structures by two.

The clock and line frequency signals received from the photosensors 20 and 21 of the generator 10 (FIGS. 3a) are triggered 44 and 23. Then, the signals from the direct and inverse outputs of the trigger 44 and the clock signal are sent to terminals, 27 and 29 matches . As a result, the duty cycle of the divided pulses is halved so that the subsequent combination of even and odd pulses does not overlap them. At the output of the coincidence element 29, pulses of odd elements (in the row) are formed; at the output of element 27, pulses of even elements (Fig. 3 & j2). From the direct and inverse outputs of the trigger 23, the horizontal frequency signal is fed to the inputs of the elements 26 and 28 of the coincidence. As a result, the signals of odd lines are formed at the output of the element 26, and the matches of the element 28, even, are formed (Fig. 33, f). From the outputs of the matching elements 26 and 29, the pulses arrive at the inputs of the matching element 31, the output of which produces pulses of odd elements of odd sides corresponding to the structure (Fig. 4 & D). From the outputs of elements 27 and 28, coincidence pulses are fed to the inputs of a matching element 30, at the output of which pulses of even elements of even 1 × 1X lines are formed (the structure of FIG. 4g and Fig. 1). The signals from the codes of elements 30 and 31 of the match arrive at the inputs of the element OR 42, at the output of which pulses of the total structure are formed (Fig. 4a and Fig. 3c). From the outputs of the matching elements 26 and 27, the pulses arrive at the inputs of the matching elements 32, which forms a signal corresponding to even

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the number of elements of odd lines (Fig. Зк). The match element 33 generates a signal corresponding to the odd elements of the even rows (FIG. 3L). Combining the signals of elements 32 and 33 of coincidence gives a structure (Fig. 3m). The pulses from the outputs of elements 29 and 26 coincide, respectively, to the inputs of the flip-flops 24 and 25, where a further division of the line frequency and the frequency of the pulses takes place (in the line).

Similarly, receive the signals forming the structure (Fig. 4o, 3, B, e and Fig. Zn-C ().

The invention does not change its essence if it uses a different type of recording node. For example, a node with the formation of points from a variety of sub-elements and numerical control of their area and position. It is obvious that information about these parameters is completely contained in the signal received at the output of the adder, and its conversion to digital. This form does not represent a special technical problem.

Claims (1)

Invention Formula The device of raster reproduction of half-tone originals containing sequentially connected a driver of the video gradient module and a quantizing unit, a pulse generator connected to the former of pulse sequences, a key block whose outputs are connected to an adder whose output is connected to a recording unit that, in order to increase the playback quality while simplifying it, a two-sided limiter, the first subtraction unit, the yf block, and the second block are read. and a switch unit, while the outputs of the quantum unit 1 are connected to the information inputs of the switch unit and the inverting inputs of the first subtraction unit, the power input of which is connected to the input of the quantizing unit through a two-way limiter multiplying the output of which is combined with the first input of the second subtraction unit, the second input of which is connected to the input of the shaper of the gradient module video signal In addition, between the output of the pulse posledova25 The switches and the outputs of the smart unit and the second subtraction unit are connected to the corresponding inputs of the key block. la in j it g I ir l- ir jr a well z-jr-i-y-h: lgg-jr I-a-t-ir-1-it-z y a a k k tt a x. rjr ff - jr lg an I f s x l z  Jt a jr f f 8 8 f f la la a a a I . li fi fttxf ifMV Order 4637 Circulation 624 Subscription VNIISH State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4