SU955131A1 - Device for interfacing tv pickup with computer - Google Patents

Description

(54) DEVICE FOR PAIRING A TELEVISION SENSOR WITH THE COMPUTER

one

The invention relates to computing and automation and can be used in information processing systems and, in particular, in image input devices in a computer or image output to a recording element of a point-raster 5 type.

A device for reading graphic information is known based on line-by-line image scanning, image signal generation and image Q 1 signal recording.

A disadvantage of the known device is the distortion of an image containing thin lines that are parallel to the direction of line scanning. 15

The closest in technical essence to the present invention is a method of forming and recording television image signals based on line-by-line image scanning, generating image signals, comparing them simultaneously with established higher and lower reference levels and recording signals whose amplitude is greater or equal to a higher reference level and highlighting.

when comparing, the image signals, the amplitude of which is between the two reference levels, and recording the received image signal when there is the same image signal from the corresponding decomposition element in the previous line, and a device for carrying it out, containing two threshold blocks, two buffer storage blocks, the switch, the checker and the main storage unit 2. The disadvantage of the present device is the complexity of the design, which is caused by the presence of the switch and two x buffer storage blocks, capacity for information of one line each.

The purpose of the invention is to increase the reliability of the device by simplifying its design.

Claims (2)

The goal is achieved by the fact that a television sensor interface with a computer containing the first and second comparison blocks and a memory block, the inputs of the first and second comparison blocks are combined and the input of the device, the AND element and the OR element, the first the input of which is connected to the output of the AND element, the first input of which is connected to the output of the memory unit, the input of which is connected to the output of the OR element, the second input of which is connected to the output of the first comparison unit, the second input of the AND element connected to the output of the second th comparing unit, an output of OR is the output device. FIG. 1 shows a block diagram of the device; in fig. 2 is a diagram of the mutual arrangement of the read line and the read beam; in fig. 3 - diagram of the input signal of the device. The device contains the first unit 1 of comparison, the second unit 2 of comparison, the element OR 3, the buffer unit 4 of the memory and the element AND 5. The device operates as follows. The reading of thin li- is considered. Research institutes whose thickness is equal to the limiting resolution of the reading system. The amplitude of the input signal is proportional to the optical density of black on the corresponding image element. With the reciprocal arrangement of the read information and the read beam (the beam moves parallel to the line from left to right) shown in FIG. 2a, the amplitude of the input signal of the device corresponds to the graph 1 in FIG. 3, i.e. equals U |. The first comparison unit 1 responds to a signal with a large amplitude, i.e. equal or more than Ui. The signal produced by the first comparison unit through the element OR 3 is fed to the output of the device. The image signal from the output enters the digital computational machine for further processing. At the same time, the signal generated by the comparison unit 1 via the element OR 3 is recorded in the buffer memory unit 4. With the mutual arrangement of the readable information and the reading beam-a shown in FIG. 26 and 2b, the amplitude of the input signal of the device corresponds to the graph 2 in FIG. 3, i.e. equal to U2. The signal with a smaller amplitude, i.e., smaller U (but greater than or equal to U, reacts to the second comparing unit 2). The signal produced by the second comparing unit 2 is fed to the second input of the AND element 5, the first input of which from memory block 4 When the signal is present at the output of the second comparison unit 2, the information from memory block 4 through the element 5 and the element OR 3 goes to the output of the device. At the same time, the same signal is recorded in block 4 Amount. As a buffer memory block 4, it is possible to use a register with a sequential shift of information, the number of bits of which is equal to the number of information bits per line B. The proposed device, when a video signal arrives with an amplitude between threshold levels, predicts a qualitative change in information (black changes to white or vice versa). In this connection, a qualitative analysis of the information of the previous line and the implementation of a qualitative change, i.e. the input of inverse information of the previous lines. Thus, the introduction of new elements and connections allowed us to significantly (approximately by 30%) simplify the device, increase its reliability, reduce its size and cost. An apparatus for interfacing a television sensor with a computer, comprising a first and second comparison units and a memory unit, wherein the inputs of the first and second comparison units are combined and are an input of the device, characterized in that, in order to increase reliability, an element is inserted into it AND and the OR element, the first input of which is connected to the output of the AND element, the first input of which is connected to the output of the memory unit, the input of which is connected to the output of the OR element, the second input of which is connected to the output of the first comparison unit, the second the stroke of the AND element is connected to the output of the second comparison unit, the output of the OR element is the output of the device. Sources of information taken into account in the examination 1. USSR author's certificate number 734751, cl. G 06 K 11/00, -04. 10. 77. 2. USSR author's certificate number 674242, cl. H 04 N 5/76, 1978 (prototype). -ABOUT but t .; / I -.iS . R, "". Sii „F. .  No ..