DE2137676C3 - Process for point and cell-wise reproduction of original images - Google Patents

Description

The invention relates to a method for point-by-point and line-by-line reproduction of original images digital intermediate storage of the image signal sequences obtained line by line.

In reproduction technology, there is a well-known process for the rasterized reproduction of halftone images in optically-electrically scanning an original image, whereby by means of optics, a light source and an optical-electrical converter, the original is scanned line by line, and electrical Image signals are obtained. Here, the light beam scanning the original can be in one of its Scanning movement synchronous clock are interrupted, whereby electrical image signals arise that also have this clock synchronous to the scanning movement.

Another possibility is that the light beam without interruption the original line by line scanned, an image signal analogous to the density values of the scanned image points of the original is won. A clock synchronized with the scanning movement can be superimposed on this image signal, whereby image signals which also run synchronously with the scanning movement are obtained.

This scanning or conversion of the visible image on the original image into electrical signals

So there is a temporal sequence of image signals that arose from a local sequence of image points is. It is known here to quantize the individual image signals of the temporal image signal sequence

and to digitize them for enlargement or Here the 3 image signal values of the mask can be a

Reduction of the constant to be reproduced according to these image signals or control in order to

modified the image in a different cycle than with which they shift the tonal value range, as he did

have been recorded to record again. by separately scanning the image to be changed

This known method (German patent specification 5 under other conditions a corrective information

1193 534) but only allows the enlarged or mation to be added, in analogy to the original

reduced reproduction of a single image, sometimes giving up a photographic mask,

due to the scope of the procedure in the In many cases, some of which have not yet been resolved,

Reproduction technology only on this special series, it is desirable to have a picture point as a function of

would be limited to change io of its neighboring pixel.

For the purpose of image transmission, it is already here. It is particularly advantageous that at the same time knows that the images are broken down point by point and line by line time becomes the information of the relevant neighbors, the image points are digitized and available as temporal points of the image point. Follow of image signals transmitted or stored speaking the relationships between image points or are temporarily stored line by line, and timing is proposed according to the invention, the. Here, the digitization of the sequence of image signal values is carried out by means of a shift keying process obtained image signals made, register is given, in which always the information space ensure a high level of security during the transmission to some adjacent image points, d. This means that the image information is available in good time and that the image signals are transmitted and recorded again. 20 values are mathematically linked

These known methods are transferred or reproduced, the result value of which for changing the image only produces a single image. A combined value is used. Preferably, for this vernation of individual images, be it for montage or for linking, mean value formations and Ettrapola masking purposes, can be used with this method tion calculations,
not be carried out. 25 This procedure only provides image information

The present invention therefore has the up- in the row direction available. In some cases

gage, one or more image templates at len, i.e. to achieve an effect which the

the reproduction corresponds to unsharp masking in the photographic with regard to its image content,

change or combine with each other. This on- it is desirable to also obtain information from the

In printing technology, there are very often 30 adjacent lines to be included in order to change the image value.

it there on great universality in connection with according to the invention the values of the image line that

high processing security in the manufacture contains the pixel to be changed at the moment, and

of printing forms by changing or combining the values of at least one preceding and one

ren of image templates arrives. following image line cached, where

The present invention achieves this in that each line has its own shift register and image in-

that provides at least two associated image signal formations transversely to the line direction. on

follow synchronously and that this way it is possible to sharpen the image

Reproduction is influenced either in the process of gaining the unsharp signal without that

ability of certain characteristic values of a signal of a fuzzy sampling available

Image signal sequence or of both image signal sequences. 40 stands. It is also possible to sharpen this image

Provision is preferably made here for the chafing to be modified by a mask signal. The characteristic values could be combined into a selection signal sequence mask signal, for example, flesh tones from others, through which one separates the repro tones and causes the image signal sequence controlling the image distortion to be put together (unsharp masking) in the flesh tones whose image signals fall out of the synchronously read out to get smooth skin tones,
NEN image signal sequences selected and unchanged Another special task is to be adopted or changed in the image content. the places where black letters

According to an advantageous further development of the printouts, in the associated color extracts

Using the selection signal sequence, a tonal value will be copied in that is equal to the or several constant image signals recorded, 50 is the image tone value that is close to the letters

or there are tonal value changes in which the prevails. This is achieved by the fact that the

image signal sequence that controls the drawing, the value of the mask inte-

that of a color correction and / or a gradation formation when it occurs, the storage of the

change correspond. image value present at this moment and therefore

The tonal value changes are preferably input to an auxiliary memory in the output to the image controlling the recording and by means of which the signal sequence is effected as long as the image signal sequence controlling the recording of the letter signal lasts again. This is preferably read by switching off, selected and achieved at a time for recording the shift clock of the shift register,
serving image signal combined. An essential part of the process is the

If the replaced image value does not depend on the mask information being offered, one expedient Depends on the value of a pixel sequence and if the Bigerweise assumes real masks, as they are in the Replacement cannot be used from a further sequence of pixels. One achieves is taken, this is advantageously done by opening a mask on a scanner device, the image value is spanned and scanned additively or multiplicatively, and during the scan movement or subtractively or by dividing with a change in the sampling point at the same time, a clock signal can be obtained To generate value. testifies that the local assignment of the mask

The selection signal sequence is preferably determined by pixels, and in this cycle the mass

obtained electro-optical scanning of a mask. can be digitized. In order to

Data input and output devices 1 to 4 are proposed that the digital mask information, which is stored from one magnetic tape memory and one memory each, consists of an intermediate memory 6 for the process. On the masking and scanning of further, other masking tape memories consisting of 6 to 8 bits each are repeated and their digitized values are added to the 5 image signal values belonging to each pixel on mask values already stored. Corresponding tracks are stored. On a broad basis or to be linked with them. This process of the trace is one with the original pixel and has decisive advantages over the process known from the clock information associated with the location of the stored values, analogue scanner technology. He- saved. The data is being recorded! At least any number of masks can be saved, each corresponding to an image line. Form signals. Masking information of only 3 bits by an external line start clock on line 7 allows eight different processing to generate the output of the values of an image line on soft signals, while in analog technology device8 and the associated memory clock on Leibisher only four were implemented. The mask requires 9 to the memory and causes it to not be colored by it, and its information 15 is not used in a mask for the clock arriving on line 9 in a mask through difficult manual storage. The data output from the magnetic tape is in the works to be merged. It can e.g. B. continuously below the lines, from line to line there are several black and white masks. At but discontinuously. The line start clock at unfortunately sampling of the first would result in values 0 and 1 7 is generated, generated and stored by a clock control unit 10. In the case of the second and the other, which continues to have a memory polling cycle on conductors, O and 1 would primarily also be generated. The zeroing device 11 is generated for the pixel values, that is, during the storage process, this would have the effect that the signals already stored equivalent to the signals already supplied on line 9 were not changed, forming the storage clock. On input devices 1 and 2, while with a 1 a digital number may be stored, the information of two images would be available, which corresponds to the number of the mask. Seven as stand, on the device 3 the masking information. So would GeMasken eight different signals in the advises 4 is connected as an image output device to the geän mask information shown with which eight comparable-made image information, ie, the serving for recording various tasks or Aufgabenkombinaiionen image signal sequence can be played back speigesteuert to tape. brazen. The masking information that is on the lines

The mask information is geometrically simpler 30 12 or 13 of the device3, is quantitatively such as B. rectangular picture frames, wrinkle than the picture information on the lines 8. you can use electronic devices instead of masks. B. to give eight tax grain commands, which is in see generate counters and when scanning any one of the rule is sufficient, only 3 bits per bi-id point are Save mask at the same time. necessary. The device 3 can either simply

If only a few masking signals are necessary, 35 are held earlier or are organized differently,

it may be more advantageous to refer to the storage e.g. B. be used twice,

waive, and immediately the mask scanning The arithmetic unit 14 carries out assignments and changes

resulting digitized values to change the changes in the image signal values and can depending

To use image information. according to the task from different companies

These and other features of the invention exist 40 groups, for which in the following

from those described below and in which several examples are given. In the present

The exemplary embodiments illustrated in FIGS. 1 to 10 should consist of two on lines 15 and 16

emerged. It shows delivered image values and from two constants

1 shows a schematic representation of a signal value that arrives at lines 17 and 18.

construction to carry out the procedure, 45 men, corresponding to the arriving from line 13-

F i g. 2 shows a circuit structure for the computation of mask information and a new image information

work according to fig. 1, can be copied together on line 19. The signal

Fig. 3 a switching stage for a gradation change on line 13 contains four different values

tion of the image signals, speaking 2 bits. The values are in the rhythm of the

4 shows a circuit example for an average value 50 memory query clock from line 11 in the calculation, Plant 14 processed. The constant signals on the line

Fi g. 5 Another embodiment of a circuit 17 and 18 can, for. B. on potentiometers 20

for a weighted averaging, taken as analog voltage and in analog di-

6 shows a schematic representation of the signal-to-digital converter 21 being converted into digital values,

flow for performing an unsharp mask. 55 Each of the lines of signals 13 and 15 to 18 is

according to the number of bits of the image signals.

Fig.7 is a modification of Fig.6, in which the fold to think, but for the sake of simplicity

Mask information from a magnetic tape memory is shown only one line

is output, FIG. 2 shows a circuit of the arithmetic unit 14

8 shows a circuit in which the image signals in 60 for this simple case, the lines for

a shift register are given, the individual bits are shown separately, and the

FIG. 9 is a schematic representation of an op numbering of FIG. 1. The digit

Table-top electrical scanning device for implementation 13/1 or 15/1 therefore means the first bit 13/2, 15/2

tion of the method, the second bit, 15/3 the third bit of the image signal

10 shows a further embodiment of an op 65 line 15. Transfer registers 22 are provided.

table-electric scanning device. that are connected to lines for the duration of one pixel cycle

1 shows a typical diagram of the digital device 11 from the lines 13, 15, 16, 17 and 18

Image information processing according to the invention. incoming image and mask information

brazen. Only the negative line is temporarily stored for the image values, which results in a fairly high output the register 22 is used for the mask values! wall requires. The first case is a lot simpler control one positive and one negative output each and only requires a small shift register from a decoder consisting of four AND gates 23, for example three to five values of 1 byte each switching on. Only one of four 5 (- 8) bits can be used.

Outputs 25 to 28 lead a signal, whereby a F i g. 4 shows an example of an evaluated mean-corresponding AND gate of and-or gate combination value formation. It is the following in practice vorkomnation 24/1 to 24/6 is switched on. Is z. B. Considering the case. Switched on within the picture of a device28, all 6 bits of the bit- very detailed landscape may be a person information 15/1 to 15/6 at the outputs 19/1 to io. One would like to give the landscape with full 19/6 and bring it back to the record. Sharpness, the skin tones of the person but the same applies as possible for the image information on the smooth, ie without restlessness, reproduced as it is represented by lines 15/2 to 15/6, 16/1 to 16 / 6.17 / 1 to 17/6 Grain fluctuations in the original image and, for example, and 18/1 to 18/6. caused by general signal noise

Fig. 3 shows a circuit stage for a grade 15 is. A change in the image position of the image values arriving on line 13. The image signal bits gnal of a mask may be signaled again by the values 1 or 0 16/1 to 16/6 in a takeover skin area or landscape area. In register 22 for the duration of a pixel value between F i g. 4, a shift register 34 for five images is stored and point values are sent to a decoding circuit 29 and an adder 35, in which the casco is given, the z. B. from 64 sixfold-AND-gates 20 each two adjacent pixel values are added like a band and of which, however, only are shown for the sake of simplicity. Which are shown in the rectangle symbols two. The inputs of the numbers written in and gates may be written in decadic form and inverted according to the 64 possibilities. ben the image values at a certain moment, only one of the 64 output lines leads. Due to the positive signal from line 11 30/1 to 30/64 and forms the 45, the image values arriving on line 16 became the address for a core memory 31, in which 64 values in the order 6, 4, 5, 2,1 were in the Register 34 each 6 bits are permanently stored. If, for example, the line was recorded. Each clock shifts the values by 30/62 when excited, the associated six give a term to the right. The mean value 5, which is given its value to the output lines of a line 38 to a gate 39 via memory cores, reaches 32/1 to 32/6. These are from the six And-To- 3 ° via another gate 40 to the output line 19, ren 33/1 to 33/6 then to the output lines when the mask signal is 0, i.e. landscape sign?! I-19 / 1 to 19/6 are given when decoding in d "r. In the other case the route is via the addition 23 according to FIG. 2 for the mask information of the plant 35. In the output sum 61 of which the value 5 output 26 is positive , can be evaluated very little by strong, the values 2 and 4 less and the values 1 of the other circuit lines, other image information at 35 and 6. The sum value 61 can be switched to the output 19, for example the one that must be switched through by the constant the adding scheme changed image signals from line 16. A special conditional divisor, in this example the number 16, is the case when the sequence of 64 is divided, which is reversed by an element 36 symbolic image tone values, i.e. is sated from an image , or the value 5 on line 38 must also be included negative picture is taken for this. In this case 40 should be multiplied by 16. In the example, one obtains an average value of 3. 8, which differs from the corresponding figure, and the image values given in the dual code deviate from the value 5 and a weighted output can be simply inverted Fixed value storage through simpler additions via a line 37, a gate 41 and the gate 40. 45 It is given to the output 19 when the mass

Another special case is when the mask signal is 1, that is, it signals skin tone. Instead of

kcninformation not as a switch for another central value 5 in the shift register can also be used in

The information provided is used instead of the information that was last fed in

even carriers of the entire change information value 1 are balanced, for which the scheme ir is. As an example, of 8 bits of mask information, Figure 5 can give an example. There is no need for any further

Mayion 2 bit · »a control signal, thus a fourfold explanation, since it is only a variadon of Fig. 5

Carry toggle signal, and the other 6 bits one if you get to the value of each processed

64-level image point corresponding to a pictorial representation in addition to the preceding and following

Carry information. This can e.g. a colored image point or the three adjacent image masks the scanning with analog processing of the 55 point values of the two adjacent image lines

Correspond to image signals, and increases by a scanning device, these nine values can be united

have been generated in order to calculate the change in the central image point in the method of the invention, dit

to be added to the image value. in the analog scanner technology of an unsharp mask

If one corresponds to tion for the processes according to the invention, there is still the advantage here that £ at the moment not only one image value is being processed, 60 the information of an unsharp masking is not processed

but at the same time information about the values of the riding frameL d. H. must be scanned separately, son

from neighboring image points to the calculation from the "sharp" image information

Provides, then image values can also be changed and from mask information, for example in de

ments depending on the pixel environment effect intensity can be changed. This An be made. There is the possibility, only 65 change would be z. B. also in the example mentioned

to evaluate the neighboring values within an image line - to apply landscape versus skin tone,

Fig. 6 shows the circuit diagram and the signal flow

take into account. In the latter case, the neighbors are responsible for performing such an unsharp mask

tion. In this scheme are for clarity The first task can be according to a circuit because of the timing lines for image point and image line according to FIG. 7. In a modification of Fig. 6 there len switch omitted. It is an input device, in this case the input device 1, the mask information 1 provided with the tape memory 42, which mation from the magnetic tape memory 42 from. There daidie "Sharp" image information toggled line by line with 5 instead of 6 or 8 bits image values only 2 or 3 bits Tending to be processed on masking signals via a switch 44 in cyclical sequence is the effort there are three line buffers 45 to 47. The Aus much lower. Names and functions of the corridors the line memories are in three more, at rate 1 to 57 correspond to those in Fig. 6. The picture line clock cyclically operating switches 48, 49 and information is shown in FIG. 7 from an input device 50 switched so that on the output line ίο 65 with tape memory 66 and line memory 67 be-52 the values of the middle line in time are always drawn out; this is given to the jc in the decoding stage 68 while line 51 always corresponds to the previous pixel values on line 69 outgoing, line 53 the values of the subsequent mask signal from the buffer 55 deco line issues. The one read from the three line memories and the various signals sent to the line Pixel values are output to a triple 15 gen 69 or 69/1 and 69/2. One of them, Shift register 54 is supplied, which here per line - the signal on line 69/1, may be the letter signal only stores three pixel values. Be of each signal. The adder 56, which the Maskiersiin a value located in a memory 55 represents the um- um- received for the other surrounding pixels, the central pixel to be allocated. The eight should also contain a decoder. This dekodarum Values lying around represent the values but only for the letter signal alone and assignment of this image point in the original image. You lead the eight exits to an eightfold AND gate Values are added in an adder 56, that is, 70, the output of which is positive only if all as shown above, equivalent to giving a middle input values letter signal. The masking. The central value 55 is shown in a multiplicative signal on lines 69/1 and 69/2 from weltor 57 multiplied by eight. Of the two now 25, the latter is the one surrounding the letter corresponding values on the image area signal lines are assigned to the OR gate 58 and 59 are fed to line 72 in a subtracter 60. The signal on line 73 is thus positive 61 occurring difference is formed. This becomes tive when this image area or the letter is at positive mask signal on line 13 is output via a rich. Signal from line 71 is in Gate 62 the multiplier 63 and the adder 64 30 negated a negator 74 and together with the to the image signal ad- arriving at line 59 from line 73 to the AND gate dated and given to output 19. The rule-75 supplied. The one exiting the negator 74 Resistance symbol in multiplier 63 means that the signal is positive if not all outputs of the that the factor of the multiplication should be selectable. Adder 56 are positive, so the pixel still around that of the known environment masking in FIG. 35 not with the full environment of the associated Effect of different masking point 55 in the letter area corresponding to analog technology to be able to choose. dives. As long as the output of the AND gate The process, information also from neighboring 75 is positive and gives over a working as a switch To include pixels in the calculation, the adder 76 receives the image signal from the memory 67 According to the invention, the output 19 can not only refer to image information 40. Only when all masking signals are off be applied. In some tasks it may display the letter signal to adder 56, be advantageous, this applies to the mask information - the output of the negator 74 is negative and the turn to. Since their information content is usually interrupted is much lower, you can also get a memory start. The solution to the second task is not dk walled out. 45 Storage of several masking signal lines required A typical error occurs in a four-color borrowed but a simple shift register for the print e.g. on. when an image signal value c.

piated letter from the mask signal in the same Fig. 8 shows the essential features of a sol

Size removed from the color part prints chen circuit. There is an input device 1 again will. If the letter 50, which is white in the color prints, represents the image signal, its pixel value

in black printing not exactly with the black in the continuous, on the line 11 arriving

of the letter is covered, then a further pulse is given on line 77. Be: closed

They are preceded by a colored or colored border on one side of the letter switch 78 in the same cycle

bens on. In order to avoid this and similar errors, a shift register 79 is recorded and via di < den, there are two tasks. The first requires that 55 value-compensating adder 80 be connected to the output

In the color part prints, the letter border was given on the 19th. If that comes from line 13

Inside the letter is shifted, the book masking signal signals the letter and posi

slaben gap is getting narrower. The other requires tiv, it switches in switch 78 on line 81 dei

that when a letter signal occurs in the act, and it is continuously the in the slide reg Color print out the previous color signals not 6 ° ster 79 frozen image value on line 19

be switched off, but give the last saved until the letter signal on line 13 on

and as long as' aisderholt win ^{1 is} output, as heard and switch 78 turns on again.

Letter signal persists This forms in the This procedure can undergo a modification

Color overprint in the area of the letter ren if the image signal already contains letters in ur an area of color that is approximately the same as the color of the sharp, low-contrast form

Surrounding area is so that when shifting the black through additionally masked sharp letter

zen letters in the print no noticeable edge should be replaced. If in this case the ma «

becomes visible. letters in this arithmetic process or appendix

later printing does not exactly fit over that of the picture, the purpose will not be achieved. It is then better to remove the letters in the image signal. The effort required can vary greatly depending on the possible size of the misfit or the reliability of its prevention. One can, for example, the solution according to FIG. 7 with the one according to FIG. 8 connect by already causing the image signal to be fixed in the vicinity of the letter signal by stopping the transmission cycle.

Obtaining the image and masking information and their spatially precise assignment is an essential part of the process. This can already be done with a simple drum scanner with optical-electronic scanning and is shown in FIG. 9 shown in the work scheme. A scanning drum 91, driven by the motor 90 , carries the image to be scanned or a mask 92 therein. The image is hung on register pins 93. There is a punch for them, on which pictures and mask films can be punched at the same time, if necessary, thus guaranteeing the local fit on the drum. The optical scanning system 94, which consists of the objective, the image point diaphragm and the photocell, is advanced in a known manner during the rotation of the drum in the axial direction, so that the image is scanned point by point and line by line. When the drum rotates, a cycle is scanned by a further scanning optics 95 from a co-rotating grid 96 and fed to a cycle control unit 97 via an amplifier 951. This generates the pixel clock applied to line 11 by multiplying the frequency, for example. The image signal, possibly converted by the scanner 95 in an analog computer 98 , is digitized in an analog-digital converter 99 in the cycle delivered on line 11 and stored in an intermediate line memory 100. The information is retrieved from it with a mostly different pixel clock, which arrives via line 101 from clock control unit 97, and is written into magnetic tape 102 in the form of information blocks in a known manner, a block preferably containing one image line. A required image line cycle is carried out via the scanning control unit 97 by additional scanning of the drum movement, for example by a pulse magnet 103 , and fed to the magnetic tape 102 via line 104. However, it could also take place by counting the clock rate obtained by means of the scanning optics 95 . The magnetic tape is currently the preferred storage element for digitized images. However, the invention extends to all kinds of digital storage forms.

If, instead of the image, a mask is clamped onto the drum, in the simplest case a black and white mask, the same arrangement can be used, the analog computer 98 being omitted and the converter 99 being reduced to a simple threshold switch. If, according to the invention, different image and mask information are to be combined with one another, one will as far as possible avoid offering all information on separate tapes in the end process, but rather try to combine or process information beforehand when acquiring information. This applies above all to the masking information, which is usually simpler anyway, and less to the image information that one wants to keep unchanged for similar processes derived from the same output image at a different location or at a different time.

In these considerations, how much technical effort is required also plays a role, whether z. B. between small effort and large universality compromises are possible. The scheme according to Fig. 10 may be an example of this! a device arrangement give to solve a variety of tasks

ίο are. The notations are the same as in FIG. 9 and then also have the same function. It should be added to the image memory 105 and line buffer 106 and 107 which temporarily store the scanned by the scanner signal on line 108 and the removed from the band memory 105 signal over line 109 and synchronized by the computer clock on line 101 indicate the calculation stage 110th The changed signals on line 111 combined by this stage are stored in memory 100

ϊο again temporarily stored and taken over in the line cycle on line 104 as a signal via line 112 in the output memory 102 . An essential task of the clock control unit 97 is to coordinate the non-synchronous running of drum 91 and tape store 105 , the intermediate stores effecting the time adjustment. The essential principle is that each image information or mask information brings its own input clock into the buffer. This is for the befindlichc on the drum image that derived from the grid 96 via optical-electrical converter 95 clock signal 11. For the band, it is the clock signal input to the storage in the tape to line 113. The acquisition of the latches 106 and 107 in the Arithmetic unit 110 and the transfer of the result on line 111 into the output buffer memory 100 takes place with the clock on line 101, which can also be derived from the clock of the raster 96 , but does not have to be. While the clocks on lines 113, 11 and 101 control the pixel-by-pixel further transport of the image information, the clock on line 104 indicates the line-by-line transport. It is generated by the scanner via the generator 103 , optionally delayed differently for the beginning and end of the line in the clock control unit 97 and then starts the tape transport and shortly thereafter the line output from the buffer stores. With the storage of the pixel width in the tape device 102 and the clock is input arriving on line 101, to their classification and identification maintain In the arrangement of Fig. IC is immaterial in principle whether mation on the Scannei mask information to and from memory 105 Bildinfor is output or vice versa or ot process both mask information. It is only the circuit of the arithmetic unit 110 dependent on which, as described above, can appear in many variants.

It should also be noted that in a well-known way

can separate the retrieval and write-down clocks on line 101 and select different ones, and dabe achieved an image enlargement.

Finally, one more point of mask information should be mentioned, the precisely registered assignment on the image information. To do this, first of all, as far as necessary. Image and mask in relation to their register holes match exactly. Either the mask film and the image are punched separately, dam

J 14

superimposed on a register bar and that mixes can be achieved. It can be after the

Mask image copied through onto the empty film or mechanical start of the scanning movement when the

traced by hand, or after electrical transmission has already been stopped by optical

Copy, image and mask are exactly in register - scanning a mark on the drum can be achieved

laid on the other side and punched together. Another row that switches on line 101 of the line clock,

The next pulse switches the scanning device on

diameter with the same line feed from- 95 for the grid 96, and the subsequent im-

touch. The safest way to do this is to start the transmission at the same time. This means that even with some

used scanner. The third is the same what the fuzzy formation of the optical mark dei

Point to take for the start of the information. The io line and pixel-precise start of the transmission

can be electromechanical or electro-optical or secured.

In addition 8 sheets of drawings

Claims (14)

Patent claims: 1. Process for point-by-point and line-by-line reproduction of original images with digital intermediate storage the image signal sequences obtained line by line, characterized in that that at least two associated image signal sequences are stored synchronously and that the reproduction is influenced either as a function of certain characteristics Values of an image signal sequence or of both image signal sequences. 2. The method according to claim 1, characterized in that the characteristic values are combined into a selection signal sequence through which a reproduction controlling Image signal sequence is compiled, the image signals from the synchronously read out Image signal sequences are selected and adopted unchanged or changed in the image content. 3. The method according to claim 2, characterized in that in the controlling the recording Image signal sequence one or more constant image signals are recorded. 4. The method according to any one of claims 1 to 3, characterized in that by means of the Selection signal sequence tone value changes made in the image signal sequence controlling the recording corresponding to a color correction and / or a change in gradation. 5. The method according to claim 4, characterized in that the tone value changes a Auxiliary memory are input that the image signal of the selection signal sequence the selected Image signal is sent to the auxiliary memory and with the tone value change to the one controlling the recording Image signal united. 6. The method according to claim 2, characterized in that the combination of the selection signal sequence and another image signal sequence is obtained. 7. The method according to claim 6, characterized in that the combination is additive or is obtained multiplicatively or subtracth or by division. 8. The method according to any one of claims 1 to 7, characterized in that a sequence of image signals is put into a shift register in which the image signals of some one another adjacent pixels are available at the same time, and that these image signals one arithmetic linkage are subjected, the result value of which changes the image values serves. 9. The method according to claim 7, characterized in that the computational link represents an averaging or an extrapolation calculation. 10. The method according to claim 7, characterized in that the values of the image line, the contains the pixel to be changed at the moment, and the values of at least one previous one and a subsequent image line are buffered, and that each line is a shift register and provides image information across the line direction. 11. The method according to claim 7, characterized in that that a signal value of the selection signal sequence stops the shift taki of the shift register and in this way fixes, stores and causes image values for its duration always the same image value is added to the image signal sequence controlling the recording. 12. The method according to any one of claims 1 to 11, characterized in that the selection signal sequence the result is that a mask is stretched and scanned on a scanner device is that with the scanner movement at the same time a clock is generated that the local assignment of the mask pixels and that the mask information is digitized in this cycle will. 13. The method according to claim 12, characterized in that that the digitized mask information is stored, that the process by setting up and scanning further other masks is repeated and their digitized values to the already stored mask values are added or linked to them, so that an increasingly complicated mask information is saved, which is ultimately used to change the content of the image. 14. The method according to claim 12, characterized in that the mask scanning resulting digital values are used immediately to change the image values retrieved from a memory.