SU943776A1 - Device for photoelectric reading of data from microfilm - Google Patents

Description

(54) DEVICE FOR PHOTOELECTRIC READING OF INFORMATION FROM MICROFILM

one

The invention relates to the automation and computer technology and can be used to read information from microfilm.

Devices are known that contain optoelectronic converters, synchromesh search blocks connected to the information output unit. The code information accompanying the frames is recognized and extracted due to the presence of labels on the LJT Te 1.

The disadvantage of these devices is that the reading of the code matrices by such devices is possible only if J5 has special distinctive features (sync).

Also known are devices comprising a block of photodetectors and a block for eliminating-20 ki of L2 j redundancy.

In the known device, the necessary information is detected by determining code marks, however, the information

These devices cannot be read from microfilms without code marks. The aim of the invention is to expand the field of application of the device by reading microfilms without special sync chips.

The purpose of the invention is achieved in that the first, second and third elements AND, an AND block, a pulse shaper, a delay element, a trigger, a counter, a comparison block and a register, whose inputs are inputs to the device for photoelectric reading of information from microfilm, are entered into the device for photoelectric reading. and the outputs are connected to the same inputs of the comparison unit, the outputs of the photodetector unit are connected to the inputs of the first And element and to the information inputs of the And block, the input of the imaging device is connected to the output of the first And element, and the output from rvymi; The inputs of the second and third elements are And, the output of the second element And is connected with. the input of the delay element and the first input of the counter, the first input of the trigger is connected to the output of the delay element, the second input is connected to the output of the comparison unit, the first output Tpjirrepa is connected to the control input of the AND element block, and the second output the second input of the second element I, the second input of the counter is connected to the output of the third gram of the I element, and the outputs with the other inputs of the comparison unit, the outputs of the element block I are connected to the inputs of the redundancy removing unit,, FIG. Figure 1 shows the foot-wed diagram of the device; in fig. 2 - the location of the information on the film. The device contains 1 T unit 1 photo detectors, unit 2 elements And, elements And 3 and 4, unit 5 eliminating redundancy, element And 6, shaper 7 pulses, element And 8, element 9 delayed, trigger 1O, element And 11 , counter 12, comparison unit 13, register 14, film frame 15, field 16 and 17 of the film image, code matrix 18, line break 19, leftmost line 2, middle line 21, right line 22. Reader information works as follows. In the initial state, the counting 12 and the trigger 10 are in the state O, and the register 14 from the external device contains a code of the number corresponding to the number of lines of code labels in the code matrix 18. From the single output of trigger 10 to the input of the block 2 matches and to the second the input of the third element 11 receives a blocking signal, and from the zero output of the trigger 10 to the second input of the element And 8 - allowing: signal. When an optically inhomogeneous field of frame 16 (Fig. 2a) crawls onto block 1 of photodetectors, signals are generated at the output of sensor unit 1 with both a logic level and a logic level of O. The effect of these signals at the inputs of the first element And 6 does not cause a change signal level at its output. The outputs of the unit 1 of the photodetectors are connected with the first inputs of the -block. 2 And elements and with the inputs of the first element And b, the outputs of the block 2 elements And connected to the inputs of the redundancy block 5, the outputs of which are connected to an external device, the output of the first element And 6 connected to the input of the pulse shaper 7, the output of which is connected to the first the inputs of the second 8 and third 11 elements are And, the output of the second element And 8 is connected to the second input of the counter 12, and through the delay element 9 - to the single input of the trigger 10, the single output of the trigger 10 is connected to the second input of the block 2 of the elements And and to the second input of the third El And 11, the zero output of the trigger 10 is connected to the second input of the second element And 8, the output of the third element And 11 is connected to the first input of the counter 12, the outputs of which are connected to the first inputs of the comparison unit 13, the second END1 of the comparison unit 13, connected to the outputs of the register 14, the inputs of which are connected to an external device, output. The comparison unit 13 is connected to the zero input of the trigger 10. The photodetector unit 1 reads optical inhomogeneities from the photographic film. Block 2 of the elements And, by the trigger signal 1O, passes informational signals from the output of block 1 of photodetectors to block 5 of redundancy elimination. The redundancy elimination unit 5 improves redundancy in the read code. Element And 6 generates a signal that triggers the driver 7 when acting on all the inputs of this element signals with a logic level O. Shaper. 7 pulses under the action of the input signal forms a short pulse. In order to match the code matrix, the driver 7 generates several single pulses, the number of which corresponds to the number of rows in the read code matrix 18. As a result, the trigger 10 remains in its original state and, from its single output, to the input of the 2-element block I receives a blocking signal. In this case, the signals generated at the outputs of block 1 do not pass through block 2. When the photodetectors of the optically homogeneous section of the line spacing 19, enclosed between the field of frame 16 and the marks of the first line 20 (Fig. 2 b), crawl onto block 1, all outputs of block 1 form the signals of the same level (signals with a logical O level), under the action of which, at the output of the first element, And 6 forms a signal that triggers the driver 7. At the output of this driver, a first pulse is generated, which is supplied through the allowed element NT And 8 to the input of the counter 12, set it to zero

state, and through the delay element 9 - to the single input of the trigger 10, is set to e in the single state.

The first pulse of the driver 7 is not recorded in counter 12, since it does not pass through the third element 11, the second input of which acts as a blocking signal coming from trigger Y. Only after the first pulse stops its operation, the trigger 1O is set by the delayed pulse to one state , and from its single output to the second inputs of the third element And 11 and block 2, the enabling signal comes in, and from the zero output of the trigger 10 to the input of the second element And 8 comes a blocking signal. Subsequent pulses of the driver 7 in the process of compiling the code matrix 18 are recorded into counter 12 through time {the third element 11 11 is shown.

With further movement of the film on block 1, the codes of the first left line 20 are crawled (FIG. 2c). The code of the first left line 20 is read and transmitted through block 2 and block 5 of redundancy elimination to the external device. At the same time, the countable code is fed to the inputs of the first element And 6, i.e., the signals of both the logic level 1 and the logic level O act at the inputs of this element. In this case, the signal of the first element 6 does not start the driver 7.

Next, block 1 crawls the line spacing 19, enclosed between the first line 20 of the code marks and the middle line 21 (Fig. 2 g). In this case on. all inputs of the first element And 6 are signals with a logic level O, as a result of which the output of this element produces a signal that triggers the driver 7. Under the action of the trigger signal at the output of this generator, a second pulse is generated, which through the third element 11 enters the counter 12. The contents of the counter 12 are changed by one, approaching the value of the contents of the register 14.

Next, on block 1 I alternately crawl the subsequent lines of code labels, and after each forty of them are drawn, one is written to counter 1. The unit is written to the counter 12 at the moment when the block 1 creeps into the section of the line spacing, which is enclosed between the read and subsequent lines of code marks (Fig. 2 g, g). After reading the right end line 22 of the code marks on block 1, a section of the interframe gap 19 enclosed between the right end row 22 of the code marks and the field of the next frame 17 is crawled (Fig. 2e). In this case, the signals with the level O act on all inputs of the first element AND, as a result, the output of this element generates a signal that triggers the driver 7. At the output of the driver, a sequential pulse is generated, which through the third element 11 arrives at the input of the counter 12 The content of counter 12 is incremented by one and becomes equal to the contents of register 14. When the contents of counter 12 and register 14 are equal, a signal is generated at the output of comparison unit 13, under which a trigger 10 is set to zero. standing In this case, a single blocking output of the trigger 10 to the inputs of block 2 and the third element And 11 receives a blocking signal, and from the zero output of the trigger to the input of the second element I 8 is an enable signal When crawling to block 1, the next frame 17 (Fig. 2) and reading its optical inhomogeneities, signals are not transmitted through block 2.

The operation of the device when compiling the code matrices of the following frames is carried out similarly to that described above.

The technical and economic effect of the implementation of the proposed device is to expand the scope of application due to the possibility of reading and extracting signals from microfilms that do not contain special labels.

Claims (1)

Invention Formula A device for photoelectric reading of information from a microfilm, containing a photodetector unit and a redundancy removal unit, characterized in that, in order to expand the field of application of the device by reading microfilms with code distinctive structures without special tags, it contains the first, second and third elements And an AND block, a pulse shaper, a delay element, a trigger, a counter, a comparison block, and a register, whose outputs are inputs to the device, and the outputs (connected to one of the inputs and CPA The outputs of the photoprime / Pshkov unit are connected to the inputs of the first element And with the standard inputs of the block of elements And, the input of the former is connected to the output of the first element And, and the output to the first inputs of the second and third elements And the output of the second element And connection to the input of the delay element and the first input of the counter, the first input of the tritter is connected to the output of the delay element, the second input is connected to the output of the comparison unit, the first output is triggered and connected to the control input of the block of Pf elements with the second input of the third element And, and w Oooy Yohod - with the second input of the second element I, the second input of the counter is connected to the output of the third element I, and the outputs to other inputs of the comparison unit, the outputs of the block of elements I connected to the inputs; block redundancy. Sources of information taken into account in the examination 1, Mikhailov A. N. and others. Fundamentals of computer science. M., Science, 1968, p. 590621. 2, US Patent No. 3473036, cl. G06 K 7/14, published 19.72 (prototype). g U: "9". . 5fe F “o     f r - - - & ::: - l WA TH . ":