SU842777A1 - Device for input and output of half-tone images - Google Patents

Description

The invention relates to computing technology and can be used in digital image processing systems. Devices for input and output of half-tone images, are known. TV signal signal transmitter, analog-to-code converter, code-analog converter, interface unit, and video monitoring device 1. The disadvantage of this device is its low functionality. The closest technical solution to the present invention is a device for input and output of halftone images, comprising a television signal transmitter connected to an analog-code converter, an interface block, a code-analog converter and a video monitoring unit 2. A disadvantage of the known device is low speed. The goal is invented - raising the bucks of the device. The goal is achieved by the fact that a device containing television signal transmitters, an analog-code converter connected to a converter, a code-analog converter, and a video control unit, switches are entered, a code selector, the first input of which is connected through the first switch to the code, and the output to the input of the interface block directly, and to the input of the converter, the analogue code through the second switch, the decoder, whose input is connected to the input of the code selector, the multiplication block, the first the inputs of which are connected to the outputs of a dalfrator, the luminance level setting unit, the outputs of which are connected to the inputs of the ytmfyjK.etHHL unit, and the addition unit, whose inputs are connected to the outputs of the multiplication unit, and the output to the code selector input, and through the third switch to the inputs video control unit, the output of the interface unit through the perkg and the second switch is connected to the input of the code selector and the input of the code-gate converter, the output through the third switch is connected to the input of the video control unit. - I In the drawing, 1 is a block diagram of the device.

The device contains a television signal transmitter 1, an analog-code converter 2, a video monitor 3, a 4 code selector, a decoder 5, a multiplication unit 6, a brightness level setting unit 7, an addition unit 8, a code converter analogue 9, a .10 interface unit , the first switch 111 is the second switch 12, the third switch 13.

In input mode, the device operates as follows.

The image is converted by the television signal transmitter 1 into a video signal, which is then fed to the analog-code converter 2 and to control the original image to the video control unit 3, through a third switch 13. From the converter-analog output, the encoded video signal is fed through the first switch 11 to one of inputs of the selector 4 codes and to the input of the decoder. After decoding, the video signal level counts are fed to one of the input groups of the multiplication unit 6, the second input group of which translates into potential signals from the brightness level setting unit 7.

From the output of the multiplication unit, the selected samples of the video signal levels are logically summed up in the add block 8. From the output of the latter, these samples are fed to another input of the code selector. If these pulses coincide with the corresponding video signal codes, only the selected halftone levels of the original image will pass to the input of the mating unit 10, and thus to the computer input. When the input of the video monitor unit is connected via the third switch 13 to the output of the adder unit, the image sections with the selected set of luminance levels are displayed on the screen of the video monitor unit.

In the output mode, the code samples of the luminance levels of the displayed image go through the interface 10 and the first switch 11 to the decoder 5 and to one of the inputs of the code selector 4, to the second input of which pulses are output from the addition block 8. The input of the adder unit from the outputs of multiplication unit 6 receives only those samples of rcbps levels and which are the result of the logical multiplication of samples from the decoder and potential signals from block 7 for setting luminance levels, and the analogue code converter 9 and further through the third switch 13 to the video monitoring unit 3. As well as entering the video monitoring unit on the screen, the binary

image when the last input is connected to the output of the add block,.

To compare the image, the selection of the brightness levels with the image output from the computer to the input of the code-analog converter at the corresponding position of the second switch K2, the brightness level codes of the displayed image can be directly fed.

Reducing the redundancy of video information when entering into a computer or reducing the uncertainty of a message that is output from a computer can be estimated, for example, when threshold-level filtering of a halftone image from the difference in the amount of information

H - Hp N.Iog, jm -, J (m - m ..)

2

m

 N., m-m

where Hj and HP are the amount of information contained in the original and resulting images, respectively;

N is the number of points of constituents, image;

m is the number of quantization levels;

t is a certain threshold level of brightness.

Claims (1)

1. USSR author's certificate 462175, cl. G 06 F 3/00, 1973. 2, 5DRUS. G. The use of computers for image processing. M., Energie, 1977. c., 35j (prototype).