SU1529262A1 - Device for processing images of objects - Google Patents

Abstract

This invention relates to technical cybernetics and can be used in image processing systems. The purpose of the invention is to expand the field of application of the device due to the possibility of separating the halftone contour of the image - it is achieved by introducing three digital median filters, two difference modulus determination units, a register and an OR element, which allows determining the gradient of the brightness difference. 1 hp f-ly, 3 ill.

Description

This invention relates to technical cybernetics and can be used in digital image processing systems.

The purpose of the invention is to expand the field of application of the device due to the possibility of separating the contour of the semi-image.

FIG. 1 shows a diagram of the device; in fig. 2 - scheme of aperture former; in fig. 3 is a neighborhood of the point for which the contour gap is formed.

The device (Fig. 1) contains a television sensor 1, aperture former 2, an analog-digital converter 3, a pulse generator 4, a control unit 5, first to fourth digital median filters 6 to 9, first 10 and second 11, first difference determining unit I2 and second 13 comparison blocks, register 14, element OR 15.

Shaper 2 apertures (figure 2) contains 4M + 4 shift register 16.

The device implements the boundary boundary function, described by the expression

(L

C71

to

the juice

O5

to

fdj).

1, if | g, (ij) l O, or | g, (i.i) bO, O, otherwise

where f (ij) is the value of the image element at point (ij) at the output of the device;

C (ij3,

g (ij) are, respectively, the vertical and horizontal gradients at the point (ij);

D - threshold value

lipHMeM

g (ij.) ip (ij) - tr (ij) j A D

gjtj)

 m (ti) - m (ij3,

in with pe m (ij), m (ij),

piD

m (ij) + m (ij) are the median values found by no-local windows A, B, C, D (Fig, 3) located around element (ij) of the original image.

The device works as follows.

First, through the control input of the device, in the register 14 writes the CFI threshold code L. The image in digital form is fed to the input of the shape of the imager 2 of the aperture, which forms the neighborhood of the current image element (ij) shown in

g.Z. At the same time, on the first, second, teetiy and fourth outputs of block 2, the codes of the elements of the image - dH from the local windows A

The m images from the outputs of block 2 are fed to the information inputs of the first 6, second 7 and 8 and fourth 9, respectively.

gdiany filters in which the definition of medians of local

: it is A, B, C, and D. The shape of the window p is the dimension of the element given by the code | 5M, recorded in the register of each m | 1-digit median filter. Control by the operation of digital median filter is performed by signals from c) 1) in block 5 control to the corresponding input of each digital m |; dian filter. The signals 1 on the |) 1 input of block 5 determine the ends of the next | eval codes of the image elements that are fed to the control | 1 input of the digital median pij) B. At the output of block 10 for determining M |) the difference is obtained a binary K ||} for the difference of medians calculated from the L local windows A and D. At the output to the first block 1 determining the difference modulus, the binary code of the difference between the medians calculated by local windows B is generated. and C, which are supplied to the input of blocks 12 AND; 13. To the second inputs of these blocks.

five

Q 5

five

0

five

0

five

the binary code of the threshold L is from the output of the register 14. If the binary code of the difference modulus is greater than the threshold value, the output of the first comparison block J2 is 1 otherwise O. The control of the operation of the comparison block 12 is performed by signals received at its third input from the first output of the block 5 controls In this case, 1,. the incoming to the third input of the J 2 comparison unit determines the end of the arrival of the previous ones, the codes on its first and second inputs and the beginning of the next. Herewith, according to the result of the comparison of the previous codes, the output of the comparison unit 12 is set to O or 1, which is maintained until the end of the comparison process of the following codes.

Logic signals from the outputs of the comparison units 12 and 13 are received respectively at the first and second inputs of the OR 15 element. Thus, the signal 1 at the output of the OR 15 element indicates that the image point being processed is contour, O indicates that it is not contour.

Claims (2)

1. A device for image processing of objects comprising a television sensor, an analog-digital converter, an aperture former, a pulse generator, a control unit and the first digital median filter, whose information input is connected to the first output of the aperture former, and the control input is connected to the first and the second outputs of the control unit, the output of the pulse generator is connected to the clock inputs of the television sensor, the analog-digital converter, the control unit and the aperture former, the output a The digital-to-digital converter is connected to the information input of the aperture former, characterized in that, in order to expand the field of application of the device due to the possibility of separating the halftone contour, it contains second, third and fourth digital median filters, two units for determining the difference modulus, two units compare, register and the element OR, the output of which is the output of the device, and the inputs are connected to the outputs of the first and second comparison units, the first information inputs of which are connected to the outputs of the first and second determination units of the difference modulus, the second information inputs are connected to the register output, and the control inputs are connected to the first output of the control unit, the register information input is the control input of the device; the control input of the register is connected to the output of the pulse generator; the information inputs of the second, third, and fourth digital median Filters are attached to the second, third and fourth | the outlets of the imager are apertures, and the control inputs are connected to the first and. the second outputs of the control unit: outputs. The first and fourth digital median connectors are connected to: the inputs of the first difference modulus determination unit, the outputs of the second and third digital median filters are connected to the inputs of the second difference modulus definition block. 2. The device according to A.1, about tl and - with the fact that The aperture adjuster contains (AM + 4) serially connected shift registers, where M is the number of elements of decomposition in the television turn-off line, i, the input of the first shift register is the information input of the former, the clock inputs of the shift registers are the clock input of the former, the outputs of the second, the third, fourth (M + 2) -th, (M + 3) -th, (M + 4) -th, (2M + 2) -th, (2M + 3) -th and (2M + 4) -th the shift registers are the first output of the for-5 world of the butels, the outputs of the (M + 1) -th, (M + 2) -th, (M + 3) -th, (2M + 1) -th, (2M + 2) -th, (2М + 3) -th, (ЗМ + 1) -th, (ЗМ + 2) -th and (ЗМ + 3) -th registers with Whig are the second output of the former, the outputs of (M + 3) -th, (M + 4) -th, () -th, (2M + 3) -th, (2M + 4) -th, (2M + 5) -th, (3M + 3) -gr (3M + 4) -th and (3M + 5) -th shift registers are the third output of the former, outputs (2M + 2) -th, (2M + 3) - go, (2M + 4) -th, (3M + 2) -th, (3M + 3) -th, (3M + 4) -th, (4M + 2) -th, (4M + 3) -th (4W + 4) -ro shift registers are the fourth output of the driver. 0 five about ie W / H PMD noooo EZbO-O sh shl-s-p about 3i. B TY1. k BUT i 41 fie.g " ABOUT;