SU951372A1 - Device for reproducing half-tone images on cathode-ray tube screen - Google Patents

Description

one

The invention relates to a computing technique and can be used in designing devices for displaying half-tone information.

A device for displaying halftone images on a CRT screen, for example, for psychophysiological studies of the visual system, is known — in a controlled experiment, containing sweep generators, a brightness modulation unit, a synchronization unit, controlling a digital computer, etc. There is no way to change the image or its contrast depending on the reaction of the test operator l 15

The closest in technical essence is a device for displaying a halftone information on the screen of a cathodetraction tube containing an image scanner, a control unit for brightness, a memory unit, a communicator, a control unit LJ

A disadvantage of the known devices is the lack of a form factor.

two-dimensional half-tone images and real-time control of the properties of these images. The purpose of the invention is to spread the field of application of the device by displaying two-dimensional half-tone images in real time: time scale.

Claims (2)

This goal is achieved by the fact that, in a device for firing out half-toned information on the screen, an electron-beam tube containing a scanner of the image, a control unit connected to a control code feed rate associated with the first switch, a memory block attached to the first and second switch, a luminance control unit, the first and second bpcccc code comparisons, the second to the third cyclic counters, with one of the outputs of the control unit connected to the inputs of the cyclic counters, the outputs of the first and second cyclic counters are pinched to the inputs of the first switch, the output of the third cyclic counter is connected to the input of the second switch, the outputs of which are connected to the inputs of the code comparison blocks and the brightness control block connected to the image scanner and the other output of the control block, the output of the first code comparison block and second commutator. The drawing shows a block diagram of the proposed device. The device comprises an image scanning unit 1 comprising an electron-beam tube 2, a scan generator 3, a modulation unit 4 and a synchronizer -5 brightness control block b, the first and second cyclic counters 7 and 8, the control code supply buses 9 received from the control digital computer 10 through the interface unit 11 to the control unit 12, the switch 13, the memory unit 1-4, the switch 15, the blocks 16 and 17 compare and the codes; third cyclic-counter 18. The device operates as follows ... In accordance with the experimental procedure, the codes received from the sensor 19 of the signals of the subject through the interface card 20 are processed by a program stored in the memory of the digital computer 1O, at the output of which codes are designed to control the operation of the rest of the device. Most controllable digital machines have a common bus type interface, so a interface device, such as block 11, is designed to address and distribute received and issued codes. The exchange between the control computer 1O and the memory unit 14 is carried out according to the asynchronous principle. A control unit 12 is inserted to control this exchange. Let us call a unit of information transmitted and received by a controlling computer by a word (usually 12 + 48 bits). Let the word consist of Vn bits, and to control the brightness of one element of the image sweep, you need words. The number of AND is determined by the tasks of the experimental setup for the type of sweep and the speed of the computer. The transfer time and the words from the control computer to the unit. 14 of the memory T of the words T of the word and may differ from the delayed element of the sweep of Tpat, B (It is necessary to drink that T .. sp T otherwise the device is fundamentally inoperable; this imposes restrictions on the upper limit of the number of I words). To match the TU, word and Tpq-, 0, a block 14 of the buffer memory is used. A buffer memory block consists of N memory regions, each with length and words. The number of areas N for a control computer with a memory on elements of the MOS type to be regenerated with a duration tper with a period of Tp w is determined by the need to keep the p-i control unit 6 autonomous from the controlling machine for the time fcpgp. N is determined from the following relationship: M-1greg / Tragv 2. The double is added, since in the worst case, the regeneration can begin immediately after the end — the readout from the next buffer area. For control computers, the random access memory of which does not require regeneration, the number of buffer areas N in principle can be. However, with an increase in M, the efficiency of use of the control machine increases, since the average waiting time for the machine to release the memory block 14 decreases, this time can be used to process the experimental results. The control unit 12 organizes the operation of the device as follows. The write algorithm in the memory unit 14 consists in recording, using the switch 13, a sequence of words coming from the machine 10 into the M buffer regions of AND words to each region. The switch is controlled by a cyclic counter with 7 write words and a cyclic counter with 18 write areas. The reading algorithms consist in the fact that after the signal from the control unit 12 arrives at the end of the next sweep element, the memory area of the digital computer, the number of which is determined by the cyclic counter 8 read areas, is read by the switch 15. The first word of each area is submitted to block 16 for comparing the base number codes .ii and block 17 for comparing the code of the repetition of the output command, the main (and -1) words are entered into block 6 of the control & Lesha by rkosgyge paaaepfTKH elements. The algorithm of the most transparent writing and reading process consists in signaling the unavailability of the control unit 12 to receive the next word from the control computer of the computing machine 10 in the case of,. if the switch 13 of the record and the switch of the read 15 indicate the same area of the memory block 14. The reception of the next word from the control computer 1O occurs after a change in the state of the recording switch 13. Control of the brightness by scan elements is performed using block 6. It receives (AND -1) the word, coding the amplitudes of the basic function generators in block 16 of controlling the brightness. The number codes of the basic functions are extracted from the first word of each read buffer area using block 16. To reduce the load of block 11 from (for the control computer 10 is 10, control block 12 and, consequently, to reduce the control computer the machine of the middle speed, the command for repeating the luminance distribution of a given sweep element is entered. The code for the number of repetitions is taken from the first word of each area of the memory block 14 using the block of the code for the number of repetitions of the output command. enters the code of the number of repetitions of the output command in the control unit 12, which forces the brightness control unit 6 on the sweep elements to output the sweep element with this distribution of brightness the required number of times without additional rewriting of number codes - basic functions and their auslite codes from the memory block 14 Such a command allows, in particular, to record in one memory area a whole frame from the image and even a sequence of frames with the same luminance distribution over all scan elements (one-dimensional images ) The number of words in each memory area allocated for the codes of the number of repetitions of the output command Isn1 codes of the numbers of basic functions (in our case ONE word) can be arbitrary and is determined by the possible number of repeating elements of the sweep. shims with a set of generators of basis functions, word width wi, and speed of control of a powerful processor. The proposed device makes it possible to increase the efficiency of experimental studies of the visual system and to obtain new data on the characteristics of the visual system and the mechanisms of recognition of visual images. Apparatus of the Invention A device for displaying half-tone information on a screen of an electronic training tube, comprising an isofage scanner, a control unit connected to the control code supply bus associated with the first switch, a memory block connected to the first and second switches, characterized in that , in order to expand the field of application of the device, notices real-time display of two-tone gray-scale images, the device contains a brightness control unit, the first and second comparison blocks The first, second, and third cyclic counters, one of the outputs of the control unit are connected to the inputs of cyclic counters, the outputs of the first and second cyclic counters are connected to the inputs of the first switchboard, the output of the third cyclic counter is connected to the inputs of the second switchboard. code comparison units and a luminance control unit connected to the image scavenging unit and another control unit output, the output of the first code comparison unit and the second switch, shpga information received into account when ekspertt) se 1.Avtorskoe USSR Certificate number 44610O, kn. G09 B 7 / GS, 1972. 2. USSR author's certificate No. 54396О, кп. GO6 K 15 / 2O, 197.5.