SU1506272A1 - Method and apparatus for determining zone with nonuniform illumination - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to expand the scope of application by providing the ability to analyze fast processes. The goal is achieved by reading one implementation of the video signal and parallel integration process from its beginning and end, which allows to speed up the estimation of the position of the zone with uneven illumination. 2 sec. f-ly, 2 ill.

Description

one

(21) 4241276 / 24-28

(22) 12/19/86

(46) 07.09.89. Bul Number 33

(71) Tallinn Polytechnic Institute and Leningrad Institute of Precision Mechanics and Optics

(72) M.A. Velikotny and B.A. Kruming (53) 531.7 (088.8)

(56) USSR Author's Certificate No. 1155849, cl. G 01 B 21/00, 1985.

(54) NON-UNIFORM ILLUMINATION ZONE DETERMINATION AND DEVICE FOR ITS IMPLEMENTATION (57) The invention relates to a measurement technique. The aim of the invention is to expand the scope of application by providing the ability to analyze fast processes. The goal is achieved by matching one video signal implementation and parallel integration process from its beginning and end, which allows speeding up the estimation of the position of the zone with uneven illumination, 2 s, p. f-ly, 2 ill.

The invention relates to measurement technology and can be used in technical view systems for contactless determination of the position of objects, their sizes, as well as in other cases where the informative parameter is the position of the zone with uneven illumination in the plane of the analyzed image.

The aim of the invention is to expand the field of application by enabling the analysis of fast processes.

Figure 1 shows the block diagram of the device that implements the method; 2 shows diagrams explaining the principle of operation of the device.

The device contains a ruler of I photosensitive elements, onto which an image of a zone with uneven illumination is projected, a video processor 2 associated with ruler 1, an analog-to-digital converter 3 (ADC), whose information input is connected to the output of video processor 2, storing blocks 4 and 5, inputs which are connected to the output of analog-digital converter 3, block 6 multiple sampling, the outputs of which are connected to the inputs. read control blocks 4 and 5, adders 7 and 8, and the input of the adder 7 is connected to the output of mining unit 4, and the input of the adder 8 - with the output of the storage unit 5, the comparison unit 9, two information inputs of which are connected to the outputs of the adders 7 and 8, the third one - with the output of the subtraction unit 10, and the output input - with the resolution input of the output register 11, the information input of which is connected to the output of the block 2 of the account, the data register 13, whose information inputs connect

3150

The outputs are with the co-acting outputs of the adders 7 and 8, and the outputs are with the inputs of the block 10, the third information input of which is connected to the information output of the comparison unit 9, the pulse counter 1A, the outputs of which are connected to the control inputs of the remote register 13 and the comparison unit 9, and the input is with the output of the counting unit 12, the control unit 15 connected to the control circuit with the ruler 1, video processor 2, ADC 3, blocks A and 5, adders 7 and 8, block 6 of multiple sampling, block 9 of comparison and the output of block 12 of the account.

The device works as follows

UiuuMJCHrnan from the output of the ruler 1 photocell. P1 | : Spiral elements are fed to the input of video processor 2. As a line 1 of photosensitive elements, the device uses a linear imager on the main axis of the device with charge-coupled connection (CCD). Video processor 2 performs pre-parsing of the video signal in order to eliminate the noise of resetting the output CCD node.

The determination of the position of the zone with uneven impersonation (EIT) is carried out in two stages. First, the video signal that has been converted in the analog-to-digital converter 3 is recorded during a one-dimensional scan of the line 1 of photosensitive elements into the storage units 4 and 5 in the presence of a control signal from the first output of the control unit 15. Then, under the influence of control signals from the outputs of block 6 of multiple sampling, providing N-fold reading of one memory element, information from memory blocks 4 and 5 is read and fed to the corresponding inputs of adders 7 and 8, in which a signal is generated that is proportional to Hbrti of the current area of the MSS, having a pulsed form, in relation to the expression

ten

Q,

I

-the result of numerical integration;

- digital value of the quantized signal;

0

0

with

 video sampling time interval, X mN -I- p,

type — current sample values corresponding to coarse and accurate video signal sampling;

M max tij number of samples corresponding to the number of photosensitive elements; N is the number of samples, corresponding to the number of samples of the quantized signal, which falls on the time interval between samples, corresponding to two photosensitive elements, when read out with dS; .

With uniform video signal sampling, the formula (1) takes the form

I t,

X

%

Q ,.

(2)

where t, d u x

- the current value of the variable coordinate in the numerical integration; ys, f., read frequency

information.

At the instant of time corresponding to t / 2, where i. - full time chis-. of the integrated integration, from the counter 14 pulses, the control inputs of the data register 13 and the comparison block 9 receive the enable signal, respectively, of the memorization and comparison operations, and the signal output time

Nala where

associated with the arrival of xp pulse

R

y -, xp - 2

X gp

2

five

0

five

If the primary comparison signals I.

according to the amount

7 and are equal to each other, then the output of the comparison block 9 at the moment and the subsequent integration is smaller in magnitude - the signal enters the subtraction block 10, where the difference between the memorized large value and the current smaller value of the signals and then the current value of another signal is determined . Thus, with I, 1 R, the subtraction unit 10 receives the signal T and determines the difference M and the current value I, using the formulas

D1 I, i;

I, UI,

Accordingly, for the case of formulas (3) and (4),

M

I, - I

1 12 - L1.

The signals I, or 1 are fed to the input of the comparator unit 9, where the operation of comparing the current values of the signals I, and 1 is implemented.

Comparison unit 9 provides comparison operations only from the moment of time, produces a smaller signal at the time of the first comparison, outputs a continuously increasing smaller signal to the subtractor 10, obtains a continuously decreasing larger signal from the latter and performs comparison operations. Assuming that the left and right parts of the ZNO areas are equal (FIG. 2), the signal from the comparison block 9 is output for recording the output register I1, and the signal is recorded on the leading edge of the signal. At the time ty, the information on the ZNO position is present at the information input of the output register 11 in the form of a digital code received from the counting unit 12 and corresponding to the address of the photosensitive element and that part for which, taking into account expression (2), the equality

ty ilQ, C t,) Q ;,

r ow

From which it follows that the temporal coordinate, which determines the position of the EIT, corresponds to the energy center of the zone.

A feature of the control unit 15 is that its first output signals are fed to control inputs only with the appearance of a CCD signal from the first photosensitive element.

Claims (1)

Invention Formula 1, The method of determining the zone with uneven illumination, which consists in forming images of the zone, one-dimensionally discretely scan it, read the video signal from the zone, get a time-quantized video signal, register two te062726 the integral values obtained by integrating the same quantized video signal are compared to the current integration values, and the position of the irregular illumination area is judged by the equality of the compared values, characterized in that 10 of the widening of the field of application, one realization of the video signal is remembered; when receiving two current values, the integration of the video signal is carried out simultaneously from the beginning and The 15 end of the implementation, at the time point corresponding to that half of the scanning period, compares the integration results and remembers, further integrates in the direction of increasing the smaller value of the memorized result with a synchronous decrease by the increment value of the integral of the larger value of the memorized result 25 2, A device for determining a zone with uneven illumination, containing a ruler (} of sensitive elements, a video processor associated with a ruler of photosensitive elements, a counting unit associated with the information input of the output register, the resolution input of which is connected to the output of the comparator, and control unit that is connected to 35 control inputs of the line of photosensitive elements and video processor and the output of the counting block, which is due to the fact that, in order to expand the field of application, 40 it is equipped with an analog-to-digital converter, the information input of which is connected to the output of the video processor, two storage units, whose information inputs are connected to the output of the analog-digital converter by a data register, two adders, whose inputs are connected to the outputs of the storage blocks, and the outputs to the corresponding 50 information inputs of the data register and the comparison unit, the subtraction unit, the first two information inputs of which are connected to the outputs of the data register, and the third one - with the information output of the comparison unit, the third information input of which is connected to the output of the subtraction unit, a pulse counter, the input of which is connected to the output of the invoice block, and you71506272 stroke - with the control inputs of the comparison unit and the data register, the multiple sampling unit, two outputs of which are connected to the readout inputs of the storage units, the control unit is made with two additional outputs, the first of which Opnam ZU1g Tszig.1 ZU5 Ch7 (DuiZ Compiled by E.Glaekova Editor V. Bugrenkova Tehred A. Kravchuk. Order 5418/42 Circulation 683 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 connected to the control input of the analog-digital converter and the recording control inputs of the storage blocks, and the second to the input of the multiple sampling block and control inputs of the adders and the comparison block. Proofreader M.Samborsk Subscription