SU1195344A1 - Device for displaying graphic information on televison receiver screen - Google Patents

Description

The invention relates to computing technology and can be used in devices for displaying graphical information from a computer on a television screen. five

The purpose of the invention is to simplify the device by reducing the volume, memory block and increasing efficiency by reducing the time of the exchange with the computer. YU

This goal is achieved by introducing into the device a row register, a code comparison block, a cell register of an image frame, and a fourth counter. 15

The drawing shows a functional diagram of the device ...

The device contains a block of 1 memory, a register of 2 lines, the fourth counter 3, the block 4 of code comparison, 20 register 5 cells of the image frame, the first, the counter 6¼ first 7, second 8, third 9, fourth 10, fifth 11 and sixth 12 elements of comparison , the second counter 13, the register of 14 coordinates, 25 U, the first 15 and the second 16 decoders, the register of 17 increments k ^? ordinates X, adder 18, first 19, second 20 and third 21 registers of X coordinate, delay element 22, trigger 23, third decoder 24, third counter 25, backlight generator 26, video amplifier 27, synchro generator 28, television receiver 29 . 35

A device for displaying Graphic information works as follows.

In the synthesis of images using a computer, the image is represented as

2

a set of direct, approximating the contours of the projection of the image object on the picture plane. Then these lines are divided into segments in accordance with the division of the television raster by the conditional division grid with square cells. The outlines of the image are not evenly spaced on the television screen, and most of the cells remain empty.

In block 1 of the memory data is received from the computer about the image generated on the television screen. This data is a list of data of straight line segments into which broken, approximating the contours of the objects depicted on the television screen are divided, in accordance with the conventional grid of division of the raster into square fragments. The list is organized by macrostroke. One macrostring consists of η television lines, divided along a television sweep into cells. A fragment of the image in a macro? Rock is divided into fragments by cells. The data describing the fragments by cells is the straight line segments for which the cell number is indicated, the X coordinate code of the segment start point, the coordinate code U of the segment start point, the code is ¹ coordinate At the segment end point, the increment code of X coordinate.

. The data list for the previous macro string enters the register 2 lines during the scanning of the previous macro string. When the electron beam transitions to its scans, data will be sampled by cell number by comparing the code at the output of the even 3 11

counter 3 with the cell number code recorded in the register 2 lines. If the codes match, the corresponding Data is overwritten into register 5 of the image frame cells. Data sampling from the register 2 lines and overwriting them in the cell register is performed by the code comparison unit 4, which includes the comparison circuits and elements I. If the code at the output of the fourth counter 3 and the code of the cell number coincides, a signal is generated at the output of one of the comparison circuits overwriting the data on the corresponding segment into the register 5 of the cell of the image frame. The enabling signal. Enters the inputs of the elements 4I, the outputs of which are through multi-input elements And connected to the inputs of the register 5 of the cell frame of the image.

The pulse "Record" generated at the output of the delay element 22, the data from the register 5 of the cell frame of the image is copied to the register 14 coordinates At the point of the end of the segment, in the register 17 of the increments of the coordinate X, the first register 19 coordinates X and the second counter 13, which is written coordinate code At the point of the beginning of the segment. The fourth counter enters the counting pulses from the clock generator 28. The fourth counter sweeps the data * along the television sweep, sequentially calculating the cell numbers, which frees the computer from sorting data by cell numbers. The cell number corresponds to the most significant digits of the code of the X coordinate of the segment start point when it is specified in the coordinates of the television raster. Coordinate code At the point of the beginning of the segment and the coordinate code At the point of the end ’of the segment from the output, respectively, <second counter 13 and register 14 · arrive at the inputs of the first 7, second 8, third 9 and fourth reference elements of GO. If the TV-. If the electronic line, in which the electron beam is scanned, crosses the segment, a signal is generated that permits the passage of a pulse to the control inputs of the generator devices to form the result of the addition. Due to the receipt of control pulses generated by the first 15 and second 16 decoders, at the counting input of the second counter

95344 <

13, the coordinate code is recalculated. At the point of the beginning of the segment, and will be passed 'to the input of the adder 18 so many control pulses ,, what is

5, the initial difference between the coordinate code U and the point of the beginning of the segment and the code of the “current” television line from the output of the first counter 6. As a result, the code X _о + гдХ is formed at the output of the adder 18. This code and the code Χ _θ ± (ϊ-1) · & Χ come in registers 20 and 21 of the code of the X coordinate, respectively, and from their outputs to the inputs of the fifth 11 and sixth 12 comparison elements,

, 5 which compare them with the code at the output of the third counter 25 — a discrete count counter, which scans the data on the X coordinate with the television scan frequency 20. The signals obtained as a result of the comparison are fed to the shaper 26 of the illumination signals, the input of which also receives the sign of the increment, the X coordinates from the output

25 flip-flop 23, and at the output a pulse of illumination of the television line is formed taking into account the sign of the increment. The process of generating image signals using a vector generator is repeated in each cell into which the television raster is divided into a conventional division grid. The cell size is determined vertically by the number of TV lines in macrostroke l, horizontally by the number of discretes of the television raster - k.

The introduction of the register 2 lines, the fourth counter 3, the code comparison block 4, the register 5, the cell of the image frame can significantly reduce the memory by skipping cells that do not contain information. For example, when displaying a convex polygon containing N sides, each of which divides-. on the K segments, you will need an equal amount of memory. .

• ν _Α = Ν4 · (+ πι) _?

where Ζ is the number of digits describing a straight line;

u - the number of digits that determine the cell number.

In the absence of a sample of data according to the numbers of the cells into which the television raster is divided, the amount of memory is defined as production, 195344

maintaining the number of cells on the number of digits Ζ ν _ζ = Μ ·,

575 * 830

where.M =

PC

= 1864

For example, if N = 10, L = 5, Ζ = 21, of which the X coordinate code of the point of the beginning of the segment is 4 bits, the coordinate code Y of the point of the beginning of the segment 4 bits, the coordinate code of the Y point

ten

the end of the segment - 4 bits, the increment code X with the sign - 9 bits, t = 6, then V = 1350 bits compared to Y ₂ = 39144 bits. At the rate of 30% of the screen occupancy 10% occupy the contour of the image. Saving memory by introducing a register 2 lines, register 5 cells, the fourth counter H ¹ , block 4 comparison codes will be 89%.

Claims (1)

A DEVICE FOR "DISPLAYING GRAPHIC INFORMATION ON THE TELEVISION RECEIVER SCREEN, containing a memory unit, the first counter, the input of which is connected to the first output of the synchronous generator, and the output with the first inputs of the first and second comparison elements, the second inputs of which are connected to the outputs of the second counter, and the outputs of the first and second comparison elements, the second inputs of which are connected to the outputs of the second counter, and the outputs of the first and second reference elements, the second inputs of which are connected to the outputs of the second counter, and the outputs of with the first and second inputs of the first decoder, with the first inputs of the third and fourth - comparison elements, the second inputs of which are connected to the outputs of the register coordinates Y, and the outputs - with tert and the fourth inputs of the first decoder, the first output of which is connected to the first input of the second counter, the second output - to the first input of the adder, the second input of which is connected to the output of the increment register of the X coordinate, • and the output is connected to the first inputs of the first and third registers of the X coordinate, the second input of the first register of the X coordinate is connected to the first output of the second decoder, the first input which is connected to the second output of the synchronizing generator, the second input to the output of the third decoder, the input of which is connected to the first output of the third counter, the input of which is connected to the second output of the synchronizing generator, and the second input to the first inputs of the fifth and sixth comparison elements, the second inputs of which are connected to the outputs of the second and third registers, respectively, of the X coordinate, the illuminator, the first and second inputs of which are connected to the outputs of the fifth and sixth comparison elements, respectively, and the output is connected with the input of the video amplifier, the output of which is connected to the first input of the television receiver, the second input of which is connected to the third output of the clock generator, ₍ delay element whose input is connected to the output of the third decoder, trigger, the input of which is connected to the third input of the backlight shaper, and the input - With the second input of the register of increments of the X coordinate, the third output and the fifth input of the first decoder are connected respectively to the third input and the second output of the third decoder, the output of the first register of the X coordinate is connected Yuchen to the first input of the second register of the X coordinate, and the third input to the second inputs of the second and third registers of the X coordinate, to the third input of the adder, the second input of the increment register of the X coordinate, the second input of the second counter and the first input of the coordinate register ABOUT WITH SP 1195344 Y, characterized in that, in order to simplify the device, it contains the register of the string, the code comparison block, the cell register of the image frame, the fourth counter, the input of the register of the string connected to the output of the memory block, and the output to the input of the code comparison block whose output is connected with the register input of the cell frame of the image, the first the output of which is connected to the second input of the register of coordinate Y, the second output to the third input of the second counter, the third output to the third input of the first register of coordinate X, the fourth output to the second input of the register of increments of coordinates X, the input of the fourth counter to the fourth output of the power generator, and output - with the second input comparison block codes. one