JPS59176608A - Shape detector - Google Patents

Abstract

PURPOSE:To detect the shape of a steel plate accurately in terms of width, etc., without any influence of scattered light by obtaining an effective multiple-valued signal of scanning steel-plate image signals of plural photoelectric elements, and dividing the effective multiple-valued signal into areas corresponding to the temperature distribution of a steel plate and coding it by different threshold values. CONSTITUTION:A hot rolled steel plate 1 is scanned by plural photoelectric elements 3 along a scanning line 3a, and outputs of the elements 3 corresponding to the temperature of the steel plate 1 are multiple-valued by a quantizing circuit 10. A memory 11 is controlled by a signal significance deciding circuit 14, memory storage range selecting circuit 15, etc., applied with the multiple-valued signal. Consequently, a multiple-valued signal originating from a scan on where a deep bottom part F, etc., of the steel material 1 are present is not stored in the memory 11. Then, the storage contents of the memory 11 are divided into areas on the basis of features of the temperature distribution of the steel plate 1 and converted by a binary-coding circuit 12, division by division, into binary signals by using threshold values by histogram processing to obtain the accurate detection output of the shape of the hot rolled steel plate such as width without any influence of scattered light, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shape Akita device for detecting the good shape of the leading and trailing ends of a steel material that occurs during rolling, for example in a hot rolling process of steel.

During hot rolling of steel, the deformation of the tip of the steel material applies an uneven load to the rolling rolls in the subsequent stages, causing damage to the rolls and the production of defective material.

To prevent this, in the past, the operator visually observed the cut and operated the cutting machine at an appropriate location to cut the cut.

Therefore, the deformation of the tip of the steel material is automatically detected and the deformed part is cut to the minimum extent necessary.The material is fed to the next roll and removed to check for unevenness. In hopes of preventing roll damage, the following shape detection device has been proposed.

Figure 1 shows a block diagram of a conventional device. A red hot steel plate (υ) flowing through the hot rolling mill is passed through a lens (2) using an optical system and multiple photoelectric elements (3) lined up in a line.C measurement line (8a) k steel plate The photoelectric element (3) generates an output proportional to the temperature of the steel plate, and this output is amplified by the amplifier (4), and the analog to digital conversion circuit (A/D) (5) for each photoelectric element (3
)'s output (No. 8) is converted into a digital image. The signal of the photoelectric element (3) where the image of the steel plate (υ) is connected has a logical value of "1'', and the image of the substrate (1) is The signal of the part of the photoelectric element (3) that does not exist has a logical value of "0". A/D (
Width measurement circuit (6) consisting of a counter circuit for the output of (5)
By counting the number of logic value "1" outputs at the counter, a measurement value corresponding to the width of the steel plate (υ) is obtained.

The comparison circuit (8) compares the width measurement value of the copper plate (1) with the width reference value W given from the input terminal (7), and determines that the pile of steel plates (1) is within a certain tolerance value smaller than W. At this time, a cutting signal is applied from the comparison circuit (3) to the cutting control device (9), and the tip of the copper plate (1) is cut.

That is, as shown in #J2 Figure 1, if the pile at the center of the steel plate (1) is W, then the kW (kW) shown by the dotted line at the tip of the steel plate (1) is
It is possible to detect the position of the pile (k<1) and cut it.

The conventional device is configured as described above, so if the image of the steel plate becomes bright due to scattered light from the background or fine particles in the air, it is necessary to wait until the temperature of the steel plate itself improves in the above condition. If the width of the image is large, there is a drawback that an error occurs when digitizing only the image of the steel plate.

In order to eliminate these drawbacks of the conventional ones, the analog copper plate signal was quantized with multiple values and stored in the C memory.
This steel plate signal is divided into multiple locations corresponding to the positions on the steel plate, one temperature histogram is created for each part, the C optimum threshold value is determined, and it is binarized. , the one shown in FIG. 1 of C1 can be considered as a loading box.

The parts from the red-hot steel plate (1) to the cut η1 mechanical groaning device (9) in the same figure correspond to one of the parts described in connection with the shape detection device in FIG. 81. σQ is a quantization circuit that converts the steel plate image signal obtained in analog to a multivalued signal, Ql) is a memory that processes the quantized plate edge signal, and □□□ is a memory (6). Read out the steel plate image signal (locally) distributed to .

Create a histogram and find the optimum threshold value for °C.Local 2A The conversion circuit (2) is a steel plate (C photoelectric confectionery group (C) that receives the drive signal P that is generated every time it moves a certain distance in the detection area). 8a) and sends out an output.In the device configured in this way, the output (hereinafter referred to as a video signal) of the photoelectric element group (3) consisting of NN photoelectric elements is sent from the scanning circuit 0411. , the field of view in the lateral (plate width) direction of the steel plate is scanned and read out once every time the copper plate advances a certain distance in the direction of the arrow force.

This video signal is passed through an amplifier (4) to a quantization circuit QQ.
From this, it is converted into a digital signal having multivalued quantization levels, and stored in the °C memory CII, l in accordance with the above-mentioned scanning order. This creation is performed only M times, which is determined from the detection field of view and scanning interval, which are set in advance. As a result, for example, the memory (6) is
A video image like the one shown here is obtained. however,
As shown by the diagonal line (A) in the same figure, scattered signals, which are disturbance components, as mentioned in the section on the drawbacks of the conventional device, are mixed. Since this scattering signal is generated by the radiated light from the steel plate (1), it is caused by the high temperature part of the steel plate (υ), i.e., the part of the steel plate (υ) shown in FIG.
c) The scattered light in the parts (e) and (e) shown in 1 has a high signal level V1. On the other hand, steel plate (1) has a fourth
If there is a low-temperature part as shown in (C) and (C) in Figure (C), and the signal level ■2 of this part is C lower than the above-mentioned level vl, then the fixed threshold value I If 24fii is converted according to this method, an error will occur as shown by the solid line in FIG. 4(b). In order to remove the above-mentioned error, the binarization circuit (2) first calculates the temperature of the steel plate (1) at the central part,
That is, the video signal in the area (g) shown in FIG. 6 is retrieved from the memory (b) to create a C histogram. This histogram, as shown in Fig. 6, shows the level of the video signal horizontally @U + this, and the frequency N is plotted on the vertical axis.In the part (g) of the steel plate +1) above, the relative soft temperature l Since it is only the part that is covered, the 11th (Desk C (
As shown in the figure, one can be clearly distinguished on the histogram signal. Video signal level V indicating the boundary between the two provinces
If 3 is used as the threshold, the above part (g) should be set to 21 based on the accuracy.
The result can be stored again in memory. Continuing 'C1C12 Alternative processing I The point at the edge of the video image is determined by dividing it into the width of the copper plate (υ, for example, at a ratio of 1:2:1) on the video frame. death)
, Q is calculated, and as above, the central part in the phase direction which is a relatively vortex part (-71 area 1 is processed by Hiss 1 to Gram processing,
Binarization processing is performed using the threshold value, and the Aij result is stored again in the memory Oη1.

Continued °C1 The processing team asked us to calculate the temperature of the other point (7) on the video image, so we calculated the temperature of the steel plate (the corner of 11) from the point (yoff, second) calculated from the preset angle. A histogram is created by filtering the low area (shira) in the same manner as described above, and the histogram is processed into two images and stored in memory 0IJt.

In this case as well, the snoring plate portion and the scattering portion can be clearly distinguished on the histogram signal since they are only relatively low-temperature portions. Next, the remaining part (the same goes for area 1 of P and C) is transferred to C2, and I of memory α is
Store this. If one video image is divided and binarized as shown in 2, it will be divided into sections corresponding to the characteristics of the temperature distribution of the copper plate (1), and the scattering area and the copper plate area will be clearly identified on the histogram signal.
The error-free two-Buddha conversion process that was created a while ago is very impressive, and the memory (
(b) The video &l image after the 2-frame processing is stored. The mechanism for generating this cut-off signal is the same as that of the conventional device shown in FIG. 1, and has been described above.

In addition, the device shown in Figure 3 of J: Recording shows the minimum number of divisions required for a binarization circuit. Based on the above idea, it can be divided into smaller units and the temperature can be reduced to 1 °C. Anything over 1 is quantized. From the circuit CIQI, a digital signal with a multi-value longitude level is converted into a 2L video (No. 3 is stored in a memory oU). ), it is necessary to select the output range of the photoelectric element group (3) to be stored in the memory a.

In Figure 4, "C" sets the end (E) of the copper plate in the advancing direction to the beginning of the memory. Figure 1 KonJ
In cases where the valley of the steel plate is very deep (F) or deep, and a cutting signal centered around this valley is required.
= t % 'tA'' + tip of the plate (g)? To store from the beginning of the memory, the memory capacity H needs to be larger than the trough, which becomes huge. To avoid this, scan in the direction of movement. I feel like I'm dying to make the pitch rough, but in this situation,
The accuracy of erasing virtual image extraction in subsequent binarization processing deteriorates.

Such a valley shape has become thicker due to recent improvements in hot rolling technology 1 (width reduction in the preceding stage of the rounded finish rolling edge).
There is a trend towards L, and this kind of shape is likely to occur, whereas C also requires a function to correctly determine the position.
1"C is here.

This Confucius is concerned with such problems &hcr! The running direction of the multi-valued signal is determined by determining the validity of the signal obtained by converting the analog steel plate original signal into a multi-valued signal using a certain number of arbitrary position numbers, and storing it in the memory based on the determination result. Select the range of ``C'' and distribute it to the C memory, divide this steel plate signal into multiple parts corresponding to the position Eζ on the electric plate, create one temperature histogram 4 for each part, find the ``C optimum threshold value and binarize it. By doing so, the purpose is to provide a good shape board for private residences.

7bi, t I'm going to take a look at this invention, and I'm going to do it,
Signal) Effectiveness % 4 times W, j (1) and U. The memory storage range selection circuit 4 is changed to the 3rd - one, and the other combinations are the same as 4'81.

11J (a) is the memory C11 sequentially starting from the end of the steel plate (However)
/ is bidet ≧ - times more araka i child and "co+:! I remember it C
It represents the state of C. It is formed as shown in Figure 7.
Komono's smell C1, 1, trust 3, effective recognition circuit 0, -5i Iinouchi, even just one, it's a fault.
If there is a video signal that exceeds the reference level (the same goes for negative signals), it is determined that the line is the tip of the copper plate, and the next scanning signal is stored at the memory address of E+1. memory address 'j sequentially m'
C I'm going. On the other hand, if the function of mowing at the center N position of the scan and valid determination is made in parallel with the L, the steel plate signal will eventually appear in the range of C1 center cotton N. ,
At this point, the center valid signal determination function operates, and the 26th scanning line at that point is detected. For this convenience (-1), to reset the memory address, use the following G
As shown in Figure (b), the video signal on the +1st row is
Memory and prehistory - addresses from decaying Noriomi, and Tanibe (
F) is stored in the processable area +1j of memory QIJ.

From here, the video IfA of the steel plate for a certain distance (i is the memory) will go rainbow ztC over the j1 customary 6th leg.Constant tli:
h>u memory) The stored temporary processing (1 in j
This is what I said.

Next, at the point when the central upper moving point G has not progressed much from the previous point, and if the steel plate j1 that is taken out is in the fall, the address of the memory is If you want to reset the address, leave it at 7. By adding a function to judge the depth of the valley in the steel plate, it is possible to store the correct range in memory, whether it is shallow or deep.

Ratio 9 can be provided as an example of such a determination function.

In the figure, C1 (c) is the data comparator that compares the adopted video (d) with the level set by the comparison reference value setter (c) and determines the effectiveness of the signal. The circuit that latches the judgment result (e) is the lower 8 bits of the address counter that determines the address at which the video signal is stored in the memory. IiA indicates the upper 8 bits. Trout is a decoder that determines the current (hi) of the address, and targets the lower 8 bits, and (2) is a decoder that also targets the upper 8 bits. It is a decoder that recognizes only
Now, the explanation will be given as a device that divides the -scan into 256 parts and stores them in the °C memory.The address of the -scan is 1°, which corresponds to the F-order 8 bits. And 'C1-' is the center N address recorder during scanning, and C is connected to the lower 8-bit address bus, so that it is fine. Next, the number of scanning lines C is determined by the fact that the upper 8 bits of the address are refreshed.
: TS'(', Since the row stored in the memory is converted to 'C', the high-order 8 bits of the address are connected to the number decoder function, and the C-missing is good. (B) generates the 1g signal that resets the high-order address. Q4 is a reference clock generator for scanning the video signal, and in synchronization with this, the address comparison of the C memory is performed. is the logical product, so is the logical sum, h
Represents Noh. Φ is data bus, (b) is address bus 8
Expression, (4), 00. a3 is the same as the ministry number already explained.

To explain the copper plate shape 1 of the gold wire 8 and the woodcutter i7 of Figure 9, the video signal is scanned by the scanning circuit (to), and the video signal is passed to the converter circuit 01. The multi-valued digital No. 11 is converted into C son, but the beat data at this time is comparatively 4) (Koyotsu C validity is determined). If there is a signal, the determination result is held in the latch mountain, and the decoder (support) immediately determines that the examination has finished.
Refreshes one line of memory address.

This can be done by incrementing the upper address counter (c) by 1 bit. This state is shown in Figure 8(a) (
The process proceeds sequentially from the time when E) is detected. That is,
For the next scan, start the lower address counter from the beginning, and set the upper address to an address advanced from 011 times.C
It is stored in the second line of memory and goes to C.

Eventually, a signal is generated that increases the address range N in the center of the -scan by a factor of 1, and the 1st address has advanced considerably.
When °C exceeds a certain setter P, the °C is judged as "C condition" using the logic function and the upper address counter @ is reset.As a result, the next scanning signal I is set to G+
A video signal corresponding to the steel plate position 1 is stored starting from the leading address in the advancing direction of the memory. Then, starting from the position G+1, the video signal of the memory board is stored in the memory storage I by the number of rows to be written. The state is shown in FIG. 8(b).

If the effective signal of "C" for the central address N occurs before the Pth row, it is determined that the valley (F) of the copper plate is integrated into an area on the memory that can be binarized. In that case, by configuring the circuit so that the condition of logical product (2) does not hold, the reset pulse of the upper address counter (2) can be prevented from being generated.

As described above, a circuit is provided to set the range in the advancing direction of the steel plate according to the cutting conditions, memory 1, and memory 1. Sexuality increases like a nail trace, cutting the viscosity of business without waste 1 =
jF-f can be brought to life.

In addition, in the above embodiment, the local binarization circuit is described as hardware, but it is also possible to use software in one piece due to the computational complexity that can process the same capability.

1 piece, steel plate (No. 4 camera, C product & filter, self-diaphragm mechanism, etc. 4D is also available)
As described above, according to this invention, the temperature between the 4 steel plates, which corresponds to the 5-shaped steel plate and requires the selected 2't1 dimensions, can be calculated. The C processing area is separated based on the standby of
The histogram processing of each partial row is performed to obtain a threshold value and convert it into 2E.This allows a shape detection device that is not affected by scattered light to be obtained, which has a great practical effect.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the conventional device, Figure 2 is a diagram showing the shape of the tip of the steel plate to explain its operation, and Figure 8 is the basis of this invention (showing the configuration of this manufacturing process). ``J'' block diagram, Figures 4 through 6 respectively, Figure 8 explains the operation of the HoF device, Figure 7 is a block diagram showing the configuration of one embodiment of the present invention. Figure, Figure 8(a)
(b) is a diagram for explaining the operation of the embodiment shown in FIG. 7, and FIG. 9 is a block diagram showing details of the mounting part of the seventh embodiment. Figure (Koi°r, +IJ is steel plate, (2) is lens, (3
) is a photoelectric element group, (4) is an amplifier, 4 is a sonification circuit, a
b t, t memory, 4 is a binarization circuit, (2) is a foothold circuit, ([4I is a signal validity determination circuit, α9 is a memory storage selection circuit. In addition, the same symbol in the figure is the same, respectively. , or a corresponding portion. Agent Nno False - Figure 4, Figure 5, Figure 6, Figure 8 (α) Cb)

Claims (2)

[Claims] (1) A delivery means for forming a copper plate image on a plurality of photoelectric element groups and generating a scanning electric signal corresponding to the temperature of the copper plate, and a scanning interval of this detection means to determine the traces on the steel plate. A scanning means for controlling °C according to the traveling distance, a shadow forming means for multi-valued the detection signal obtained by this detection means, and an examination of the effectiveness of the multi-valued signal obtained by this muntinization means. a signal strength determination means for determining an arbitrary degree of L1 temperature °C; a selection means for selecting a range between the running directions of the multi-11Ii signal to be distributed to the °C memory based on the determination result; A memory means for storing the selected multivalued signal, and 8L sonization signals stored in this memory means are divided into a plurality of regions corresponding to the temperature distribution of the copper plate, and a threshold level is set for each region. A means for binarizing each of the divided sonification signals; a width measuring means for determining the plate width of each etched portion of the copper plate from the binarized signal; A shape construction device comprising comparison means for comparing standard convergence values and outputting the results. (2) Divide the low temperature part of the central part of the steel plate into 8 parts in the width direction at a predetermined ratio in the width direction. The shape cut-out according to claim 1, characterized in that this region including a predetermined portion of the tip of the copper plate on both sides is divided into two regions (X, X, and L). Device.