SU1658140A1 - Device for formation of video signal - Google Patents

Abstract

The invention relates to automation and computing and can be used to display information from a computer. The purpose of the invention is to expand the field of application of the device due to the possibility of performing projective image transformations, which is achieved by introducing the third address generator 3 and the corresponding functional connections, as well as performing the address generator. The invention allows projective transformations of video information in real time. 1 ep f-ly, 2 ill. ё HQTQ Os cl 00 Ј o

Description

The invention relates to automation and computing and can be used to display information from a computer.

The purpose of the invention is to expand the field of application of the device due to the possibility of performing projective image transformations.

FIG. 1 shows a block diagram of the device; in fig. 2 - structural diagram of the accumulating adder.

The device contains the first 1, second 2 and third 3 address drivers, multiplexer 4, memory block 5, video signal generator 6, first 7, second 8 and third 9 accumulating adders and combinational adder 10. The block diagram contains register 11, adder-subtractor 12 , multiplexer 13, registers 14 and 15.

The device works as follows.

The formulas expressing the dependence of the homogeneous coordinates of the image elements in the coordinate system of the image plane through the uniform coordinates of the image discretization elements in the screen coordinate system, when performing projective transformations, are described by the coefficients aij (,) 1-3):

Xi ZU apH1e + a12H2e + a1zHze;

X2 ZU 321X13 + 822X33 + E23Hze, U

Hz memory 331X13 + 332X23 - azzHze ..)

The values of the homogeneous coordinates of the screen plane X | E are through the Cartesian coordinates of He. , Y3 are calculated by the following expression:

Xi9 aiX + biY3 + Ci; I

X2 1He - b2ue + C2; (2)

 + Bzue + c3 ... j

Increment values for LHx AH2e. JHE 1st scan line image:

1 m- 1

X2L-X2, P |

M- 1. Xe kl

m

one

where I-0, N-1; the image sampling matrix on the screen constitutes the elements; He Ch He p | - the values of the homogeneous coordinates of the screen, respectively, at the end and beginning of the display of the 1st scan line of the image.

ten

The values of X1E × X2E × Xsch are calculated from (2) with the substitution of the values Xe - M-1; Y3 - i into the right-hand sides.

The values Xi a, X2e, Xze are calculated from (2) by substituting the values Xe 0, Ue i into their right-hand sides.

During the screen reversal moves to the registers 11 and 15 of each accumulating adder7-9, the calculated values of the LCE increments and initial values of the coordinates of He m, respectively, before scanning the 1st line of the image accumulating adders

The 15 clock frequency acting on the clock inputs of the address generators 1--3, the control input of the register 14, will generate at its output a sequence of values included in the expressions (1).

2QOn the outputs of the first shaper 1

addresses as a result of summing the values ai) X | E using the combinational adder 10, a sequence of values of Xy is formed according to (1).

25 Similarly at the outputs of the second 2 and

the third 3 address formers are formed by the values of H23U, HZZU. included in the expression (1). Thus, for the i-th scan line of the image, the coordinates of the image elements in the memory block 5 will be generated by the addresses determined by the set of X: ZU values. reading addresses of memory block 5. The sampling elements 35 of the image of the i-th scanning line are read from the memory block 5 and are fed to the video signal generator 6 for summing up with the television clock signal. At the output of the imaging unit 6, a 4-levised video signal is generated. When forming N lines on the indicator screen, an image geometrically transformed according to the transformation parameters specified in expression (1) occurs.

/ 15 Record in block 5 of the original memory

the images in the system of projective homogeneous coordinates occur at the information input of the device, at the addresses coming from the address inputs of the device through the multiplexer 4.

Recording information in registers 11, 15 is gated with lower-case damping pulses. Depending on the content of the sign input of the adder-subtractor 12,

55 the last one for each clock signal acting on the control input of register 14, performs summation or subtraction from the values set at its information inputs. In register 14, information is entered on the front of the clock pulses acting on its control input, and is outputted on its output - on the decay of these pulses. At the control input of the multiplexer 13, a signal is applied that connects the output of the register to the information input of the register 14 adder-subtractor 12, and for the duration of the line or frame extinguishing pulses - the input of the second register 15 for installation in the register 14

value of the initial coordinate of He p |.

Thus, the proposed device allows real-time projective transformation of images previously recorded in memory unit 5 on the raster display screen.

Claims (1)

Claim 1. A device for generating a video signal comprising a first and second address generator, a multiplexer, a memory block whose output is connected to the information input of a video driver, the information input of the memory block is the information input of the device, the control input of the memory block is the first control input of the device, the address inputs of the memory block are connected to the multiplexer outputs; the first information inputs of which are connected to the outputs of the first and second drivers address a, the information inputs of which are, respectively, the information inputs of the first and the fifth device groups, the control inputs of the first address generator, connected With the control inputs of the second address generator, are the / Gaussian inputs of the device group in the open information inputs of the multiplex -sorder are the address inputs of the control input of the multiplexer being the second control input of the device, the clock input of the first address generator connected to the clock input of the second generator dresa is the clock input of the device, the sync input of the video signal maker is the sync input of the device, the output of the video signal maker is the output of the device for connection to the video input television receiver, characterized in that, in order to expand the field of application of the device due to the possibility of performing projective image transformations, it contains a third the address driver, the outputs of which are connected to the first information inputs of the first multiplexer, the information inputs of the third address generator are the information inputs of the third group of device, the control inputs of the third address generator are connected to the control inputs of the first address generator, the clock input of the third address generator is connected clock input of the first address generator 2 The device according to claim 1, which differs from q heme, that the address driver contains from the first to the third accumulating adders, which are connected to the information input of the combined adder, the outputs of which are the output of the generator, the information inputs from the first the third accumulating totalizer GOL are the information inputs of the former, the control go / w from the first to the third accumulating accumulators are the control inputs driver, clock inputs from the first control of the accumulating adders vmmot clock input drivers uh eleven I P HRM Inf 15 to u Output J FIG. 2