JPH0436879A - Article checking device - Google Patents

Abstract

PURPOSE:To eliminate the erroneous signal accompanied with an irregular reflection signal in a picture signal by processing a luminance signal and a relative chromaticity signal, or a relative chromaticity sum signal by an irregular reflection signal eliminating circuit. CONSTITUTION:The high level states of a luminance signal Y and a relative chromaticity signal the inverse of X or a relative chromaticity sum signal the inverse of XDELTA generated based on three primary color signals R, G, and B taken out from the picture signal of an article to be checked are counted by a counting circuit 48. The number of foreign matters mixed in or stuck to the article to be checked is counted. When the counted result exceeds a pre scribed value to generate a foreign matter detection signal V, the luminance signal Y and the relative chromaticity signal the inverse of X or the relative chromaticity sum signal the inverse of XDELTA are processed by an irregular reflec tion signal eliminating circuit 70 to eliminate the erroneous signal, which is accompanied with the irregular reflection signal in the picture signal, from the luminance signal Y and the relative chromaticity signal the inverse of x or the relative chromaticity sum signal the inverse of xDELTA.

Description

Detailed Description of the Invention (1) Purpose of the Invention [Field of Industrial Application] The present invention processes an image signal obtained by imaging an article to be inspected, which is being conveyed by an article conveying section, by an article imaging section. In particular, J: Concerning an article inspection device for inspecting whether or not a foreign object is mixed in or attached to an article to be inspected.
In particular, the luminance signal Y and the relative chromaticity signal X created based on the three primary color signals R, G, and B extracted from the image signal of the inspected article are also in a high level state of L <L; J relative chromaticity sum signal XΔ is counted by a counting circuit to count the number of foreign objects mixed in or attached to the inspected item, and when the counting result exceeds a predetermined value, a foreign object detection signal ■ is generated. By processing the chromaticity signal There is a related item-C related to an article inspection device formed by:

[Prior Art] Conventionally, this type of article inspection device processes an image signal obtained by imaging an article to be inspected (for example, seaweed) being conveyed by an article conveying section using an article imaging section. When inspecting whether or not a light object is mixed in or attached to the inspected article, in particular, (1) the luminance signal Y and producing at least one of the relative chromaticity signals MX, counting the high level state of at least one of the luminance signal Y and the relative chromaticity signal When the counting result exceeds a predetermined value, a foreign object detection signal ■ is generated, or (i
i-) Three primary color relative chromaticity signals Xll, X1 based on the three primary color signals R, G, B extracted from the image signal of the inspected article
, A sum signal xIll is created, and a counting circuit counts the high level state of the relative chromaticity sum signal It has been proposed to generate a foreign object detection signal ■ when
31.5636).

[Problems to be Solved] However, conventional article inspection devices cannot handle AA, . 2. (i) Create at least one of the luminance signal Y and the relative chromaticity signal X based on the three primary color signals R, G, and B extracted from the image signal of the inspected article,
and the high level state of at least one of the relative chromaticity signals (j, i) Create three primary color relative chromaticity signals Xll, Xa, X8 based on the three primary color signals R, G, B extracted from the image signal of the inspected article,
and adding the other three primary color relative chromaticity signals excluding the three primary color relative chromaticity signal corresponding to the largest one among the three primary color signals R, G, B to each other at a desired ratio to create a relative chromaticity sum signal XΔ, The counting circuit counts the high level state of the relative chromaticity sum signal (1) If an erroneous signal is mixed into the image signal due to diffuse reflection of C on the surface of the item to be inspected, there may be foreign matter (such as seaweed) mixed on the surface of the item to be inspected. (for example, small shrimp, net scraps, wood scraps, etc.), and (b) there is also a drawback that the accuracy of foreign matter inspection of the inspected article cannot be improved, resulting in fij, i) There were some drawbacks in that the quality of the products could not be sufficiently improved.

Therefore, in order to eliminate these defects, the present invention has developed an image of the article to be inspected (three primary color signals R, G extracted from No. 2).
, a luminance signal Y created based on B, and a relative chromaticity signal X
Alternatively, the high level state of the relative chromaticity sum signal At this time, by processing the luminance signal Y, relative chromaticity signal X, or relative chromaticity sum signal An object of the present invention is to provide an article inspection device that removes erroneous signals accompanying diffusely reflected signals.

(2) Structure of the Invention [Means for Solving Problems] The first means for solving the problems provided by the present invention is as follows. In an article inspection device that inspects whether foreign matter is mixed in or attached to the inspected article by processing the obtained image signal, ia) three primary color signals for extracting the three primary color signals R, G, and B from the image signal; The input terminal is connected to the output terminal of the signal extraction circuit (41) and (l) three primary color signal extraction circuit (old), and the three primary color signals R, G, given from the three primary color signal extraction circuit (41), (c) The input end is connected to the output end of the brightness signal creation circuit (42) for creating the brightness signal Y from B, and the brightness signal Y changes from the set value. An article inspection device characterized in that it outputs a brightness comparison signal Y' which becomes a high level state only when the brightness signal Y exceeds a set value.

A second solution to the problem provided by the present invention is as follows: [By processing an image signal obtained by capturing an image of the inspected article being conveyed by the article conveying section by the article imaging section, a foreign object is removed from the inspected article. In an article inspection device for inspecting whether or not color is mixed or attached, (a) a three primary color signal extraction circuit (Ill) for extracting three primary color signals R, G, and B from an image signal; and (b) three primary color signals. The input terminal is connected to the output terminal of the extraction circuit (41), and the three primary color signals R, G, and B given from the three primary color signal extraction circuit (41) are added together to create the three primary color sum signal X. a three-primary-color signal addition circuit (44), a comparator circuit (43) for connecting the output terminal of the (cl three-primary-color signal extraction circuit (41)) and the output terminal of the three-primary-color signal addition circuit (44), and (dl comparison circuit) The input terminal is connected to the output terminal of (43), and the counting circuit counts the foreign matter mixed in or attached to the inspected article by counting the high level state included in the brightness comparison signal Y'. (48) and fe) the output terminal of the luminance signal generation circuit (42) and the comparison circuit (
43) or between the output end of the comparator circuit (43) and the input end of the counting circuit (48), and is inserted between the input end of the comparison circuit (43) and the input end of the counting circuit (48), and is inserted between the input end of the comparison circuit (43) and the input end of the counting circuit (48), and is used to detect the diffused reflection signal in the image signal from the brightness signal Y or the brightness comparison signal Y0. A diffuse reflection signal removal circuit (7) for removing the erroneous luminance signal YN or the erroneous luminance comparison signal YN+ accompanying
1), [The input terminal is connected to the output terminal of the fl counting circuit (48), and when the counting result of the counting circuit (48) exceeds a predetermined value, a foreign object detection signal ` is generated. The input terminal is connected to the foreign object detection signal generation circuit (49), and the three primary color signals R, G, and B are divided by the three primary color sum signal X to generate the three primary color signals R, G, and B.
G, B primary color relative chromaticity signal X Il, X, α, X
(d) a division circuit (45) for calculating n and outputting the maximum value as a relative chromaticity signal X; (d) an input terminal connected to the output terminal of the division circuit (45); 1, and determines whether or not the relative chromaticity signal X exceeds the set value, and outputs the relative chromaticity comparison signal X' which becomes a high level state only when the relative chromaticity signal X exceeds the set value. The input terminals are connected to the output terminals of the Lt comparator circuit (46) and the tel comparator circuit (46). A counting circuit (48) for counting foreign substances mixed in or attached to the inspection article; and (f) between the output terminal of the division circuit (45) and the input terminal of the comparison circuit (46) or the comparison circuit (46). is inserted between the output end of the counter circuit (48) and the input end of the counting circuit (48), and detects the error relative chromaticity signal due to the diffused reflection signal in the image signal from the relative chromaticity signal X or the relative chromaticity comparison signal X'. The input end is connected to the diffuse reflection signal removal circuit (72) for removing XN or the erroneous relative chromaticity comparison signal 48) No. 5
``An article scanning device characterized by comprising a foreign object detection signal generating circuit (49) for generating a foreign object detection signal (4) when the numerical result exceeds a predetermined value.''

A third means of solving the problem provided by the present invention is as follows: ``By processing an image signal obtained by imaging an article to be inspected being conveyed by an article conveying section by an article imaging section, foreign particles can be detected on an article to be inspected. In an article inspection device for inspecting whether or not a color is mixed or contaminated, (a) a three primary color signal extraction circuit (41) for extracting three primary color signals R, G, and B from an image signal; ) The input terminal is connected to the output terminal of the three primary color signal extraction circuit (41), and the luminance signal is used to create the luminance signal Y from the three primary color signals R, G, and B given from the three primary color signal extraction circuit (41). A signal generation circuit (42), (c) a luminance signal generation circuit (fl) whose input terminal is connected to the output terminal of 42+, determines whether the luminance signal Y exceeds a set value, and generates the luminance signal Y. (d) to the output end of the three primary color signal extraction circuit (41); The input end is connected to the three primary color signal addition circuit (4
(e) The input terminal is connected to the output terminal of the three primary color signal extraction circuit (41) and the output terminal of the three primary color signal addition circuit (44), and the three primary color signals RG and B are converted into the three primary color sum signal X. The relative chromaticity XR of the three primary color signals R, G, B is divided by
The input terminal is connected to the output terminal of a division circuit (45) for calculating XG, X, and outputting the maximum value as a relative chromaticity signal , for determining whether or not the relative chromaticity signal X exceeds a set value and outputting a relative chromaticity comparison signal X' that becomes a high level state only when the relative chromaticity signal X exceeds the set value. 2 comparison circuit (46), and (g) first comparison circuit (
The input terminal is connected to the output terminal of the second comparison circuit (43) and the output terminal of the second comparison circuit (46), and a combination signal 2 is obtained by combining the luminance comparison signal Y' and the relative chromaticity comparison signal X+. a signal combination circuit (47) for creating and outputting; 1)) between the output end of the R7 degree signal creation circuit (42) and the input end of the first comparison circuit (43) or the first comparison circuit ff143; ) is inserted between the output terminal of the signal combining circuit (47) and the erroneous luminance signal Y accompanying the diffuse reflection signal in the image signal from the luminance signal Y or the luminance comparison signal Y'.
N or the first to remove the erroneous brightness comparison signal YN+.
(1) The output terminal of the division circuit (45) and the second comparison circuit (4
6) or between the output terminal of the second comparison circuit (46) and the input terminal of the signal combination circuit (47), and is inserted between the input terminal of the second comparison circuit (46) and the input terminal of the signal combination circuit (47), and is inserted between the input terminal of the second comparison circuit (46) and the input terminal of the signal combination circuit (47), and is inserted between the input terminal of the second comparison circuit (46) and the input terminal of the signal combination circuit (47), X
(j) a signal combination circuit; The input terminal is connected to the output terminal of (47), and the counting circuit ( 48) and fk) A foreign object whose input end is connected to the output end of the counting circuit (48) and which generates a foreign object detection signal ■ when the counting result of the counting circuit (48) exceeds a predetermined value. An article inspection device characterized by comprising a detection signal generation circuit (49).

A fourth solution to the problem provided by the present invention is to [process an image signal obtained by capturing an image of the inspected article being conveyed by the article conveyance section by the article imaging section, thereby detecting foreign matter in the inspected article. In an article inspection device for inspecting whether or not 44 is contaminated or not, it includes: [a) a three primary color 1 page extraction circuit (141) for extracting and outputting three primary color signals R, G, 13 from an image signal; , (b) F1, the input terminal is connected to the output terminal of the primary color signal extraction circuit (141);
To the output end of the three primary color signal addition circuit (142) for adding G and B to each other to create the three primary color sum signal The input end is connected to the three primary color signal R given from the three primary color signal extraction circuit (141)
, G, and B by the primary color sum signal X obtained from the primary color signal addition circuit (1, 42), the primary color relative chromaticity signals X, R, XG, and (d) division circuit [144A1.144B1.144C+
), whose input terminal is connected to the output terminal of a relative chromaticity sum signal calculation circuit (1, 4B) for adding the relative chromaticity signals of the two three primary colors to each other at a desired ratio and outputting the result as a relative chromaticity sum signal XΔ; and fe) a relative chromaticity sum signal The input end is connected to the output end of the signal calculation circuit (i, 46), and it determines whether the relative chromaticity sum signal x 8 exceeds the set value and calculates the relative chromaticity sum signal XΔ.
A comparison circuit (1b7) for outputting a relative chromaticity sum signal
), and (f) the input terminal is connected to the output terminal of the comparison circuit (i, 47), and the inspection object is detected by counting the high level state included in the relative chromaticity sum comparison signal (g) For relative chromaticity (, i stomach calculation circuit + 146j output terminal and comparison circuit (147) input terminal Between the output terminal of Cj゛comparison circuit (147+) and the counting circuit (i1, 48+
is inserted between the input terminal of the relative chromaticity sum signal XΔ
Or from lj:l11# vs. chromaticity sum comparison signal Xl11) to the erroneous relative chromaticity sum signal
The input end is connected to the output end of the diffuse reflection signal removal circuit (1,731) and the (I(i) counting circuit (1,48+) for removing Δ14 or the erroneous relative chromaticity sum comparison signal X5N'. , a counting circuit (1,48+); and a foreign object detection signal generating circuit [1,49] for generating a foreign object detection signal ■ when the counting result of 1,48+ exceeds a predetermined value. It is.

A fifth solution to the problem provided by the present invention is to: In an article inspection device for inspecting whether foreign matter is mixed in or attached to an inspection article, (a) a three primary color signal extraction circuit f1 for extracting and outputting three primary color signals R, G, and B from an image signal; .41. +
(l) The input terminal is connected to the output terminal of the three primary color signal extraction circuit (1411), and the input terminal is connected to the output terminal of the three primary color signal extraction circuit (1411).
(c) the output of the three primary color signal extraction circuit (1411); and (c) the output of the three primary color signal extraction circuit (1411). The input end is connected to the end and the output end of the three primary color signal addition circuit f1.4 +, and the three primary color signal extraction circuit f1.4
1. +, l, and one of the three primary color signals selected from the three primary color signals R, G, and B is added to the three primary color signal addition circuit f142.
) to the input terminal of the comparison circuit (f147) or the input terminal of the comparison circuit (1471
is inserted between the output terminal of the counting circuit f1.48+ and the input terminal of the counting circuit f1.48+, and calculates the relative color associated with the random error signal in the image signal from the relative chromaticity signal X or the relative chromaticity comparison signal X'. (g) A counting circuit (148+) whose input terminal is connected to the output terminal of the counting circuit (148+); 1.49 + A foreign object detection signal generation circuit for generating a foreign object detection signal (1) when the count result of 1.48+ exceeds a predetermined value.

A sixth solution to the problem provided by the present invention is as follows: ``Three primary color relative chromaticity signals X1, X6Xll to j
A division circuit (144A1,
144B.

1.446,).

(d) Division circuit (144A1.1.44β, 144
The input end is connected to the output end of cl),
Division circuit f144A1, 144β, 1.44C1
) a relative chromaticity comparison signal that determines whether or not the relative chromaticity signal X exceeds a set value and becomes a high level state only when the relative chromaticity signal X exceeds the set value; A comparator circuit (147) for outputting x-, and an input terminal connected to the output terminal of (e) comparator circuit (1471), which detects the high level state included in the relative chromaticity comparison signal X'. A division circuit (148) for counting the number of foreign substances mixed in or attached to the inspected article by counting, and (f) division circuits f144A1, 144β, 144
In an article inspection device that processes the output terminal number of C1) to check whether foreign matter is mixed in or attached to the article to be inspected, (a) extracting the three primary color signals R, G, and B from the image signal; (b) The input terminal is connected to the output terminal of the three primary color signal extraction circuit (141,j, and the output terminal of the three primary color signal extraction circuit f141) Three primary color signals R, G
, B to each other to create the three primary color sum signal X; (c) the output end of the three primary color signal extraction circuit (141) and the output of the three primary color signal addition circuits (1, 42) The input end is connected to the three primary color signal extraction circuit f141. ) by dividing the three primary color signals R, G, B given from the three primary color signal addition circuit f1121 by the three primary color sum signal X given from the three primary color signal addition circuit f1121, the three primary color relative chromaticity signals X R,
) for calculating and outputting the division circuit (1,44A1,
144β,, 1446,) and (d) division circuit (
The input terminal is connected to the output terminal of the 144A1, 144β, 1.44C1), and the first three primary color relative chromaticity signals , x (
1) Multiply x by desired coefficients α, β, γ to obtain three primary color relative chromaticity signals with coefficients αX1), βX6 . Multiplication circuit f144A2, 144C2) for calculating and outputting γX□; (e) Three primary color signal extraction circuit 11.41. ), the input end is connected to the output end of the three primary color signal extraction circuit (1
4] To compare the three primary color signals R, G, and B given from Δ+ with each other, calculate and output the selection signals g n, g o, g n that correspond to the maximum value and become O. The input terminal is connected to the selection signal generation circuit (1, 43), the output terminal of the ff1 multiplication circuit F144A2.144B2.1.44c2), and the output terminal of the selection signal generation circuit (143), and the selection signal The selection signals gu, gc, go etc. given from the generation circuit f143) are
, 44A2144B2.144c2+, the three primary color relative chromaticity signals αXR, βX6 . A relative chromaticity sum signal calculation circuit (146+) for adding the products with γ A relative chromaticity sum whose ends are connected and which determines whether or not the relative chromaticity sum signal XΔ exceeds a set value and becomes a high level state only when the relative chromaticity sum signal XΔ exceeds the set value. (11) The input terminal is connected to the output terminal of the comparison circuit (147), and the input terminal is connected to the output terminal of the comparison circuit f147) for outputting the signal signal XA), and A counting circuit (148) for counting the number of foreign substances that have entered or landed on the inspected article by counting the high level state, and (1) an output terminal of the relative chromaticity sum signal calculation circuit (146). 5
] and the input terminal of the comparison circuit f1471 or between the output terminal of the comparison circuit (147) and the input terminal of the counting circuit f1481, and is inserted between the relative chromaticity sum signal XΔ or the relative chromaticity sum comparison signal XΔ+ A diffused reflection signal removal circuit (73
) and (j) The input terminal is connected to the output terminal of the counting circuit (1, 48), and when the counting result of the counting circuit f1.48) exceeds a predetermined value, a foreign object detection signal ■ is generated. Foreign object detection signal generation circuit f1.49 for
) An article inspection device characterized by comprising:

[Function] The article inspection device according to the present invention achieves [1st step of solving the problem]
Since it has the configurations listed as the first to sixth solutions in the column, (1) it functions to remove the erroneous signal accompanying the diffusely reflected signal in the image signal, and as a result, fij) It has the effect of improving the accuracy of testing for foreign matter mixed in or attached to the test item.

The article inspection device according to the present invention [Means for solving problems]
In particular, the above (j, l (ii)
In addition to the effects of (iii) foreign matter mixed in or attached to the inspected article, it is detected by using the difference in color between the inspected article and (1) foreign matter mixed with or attached to the inspected article. This works to further improve the accuracy of inspecting foreign matter.

[Example 2] Next, the article inspection apparatus according to the present invention will be specifically explained by citing preferred embodiments thereof and referring to the attached drawings.

However, the examples described below are described to facilitate or promote understanding of the present invention, and are not described to limit the present invention.

In other words, each element disclosed in the embodiments described below includes all design changes and equivalent substitutions as long as they fall within the spirit and technical scope of the present invention.

(Explanation of attached drawings) FIG. 1 is a block circuit diagram showing a first embodiment of an article inspection apparatus according to the present invention.

FIG. 2 is a partially cutaway perspective view showing a part of the embodiment shown in FIG. 1 in an enlarged manner.

The third section is a partial block circuit diagram for enlarging and showing a part of the embodiment of FIG.

FIG. 4 is a flowchart showing the operation of the embodiment of FIG. 1.

5(a) to 5(cl) are explanatory diagrams for explaining the operation of the embodiment in FIG. The foul signal (referred to as "talking reflection signal °") P8 is the specular reflection of light Rfl-+1 Rf at the foreign object 1 with high chroma and the foreign object NL with low chroma.
t, a reflected signal (referred to as a ``foreign object reflected signal'') P
1, 1, and PL are included in the image signal P.

6(a) and 6(b) are explanatory diagrams for explaining the operation of the embodiment of FIG. 1, in which the diffuse reflection signal PN included in the image signal P is The operation for removing the erroneous brightness comparison signal Y, □1 caused by the brightness comparison signal Y, □1 from the brightness comparison signal Y' is explained.

FIG. 7(a) fly+ is an explanatory diagram for explaining the operation of the embodiment of FIG. 1, in which the diffuse reflection signal PN included in the image signal P is
The operation for removing the erroneous relative chromaticity comparison signal Xn'' caused by the relative chromaticity comparison signal X' is explained.

FIG. 8 is a block circuit diagram showing a second embodiment of the article inspection apparatus according to the present invention.

FIG. 9 is a block circuit diagram showing a third embodiment of the article inspection apparatus according to the present invention.

FIG. 10 is a flowchart showing the operation of the embodiment shown in FIG.

FIG. 11 is a block circuit diagram showing a fourth embodiment of the article inspection apparatus according to the present invention.

FIG. 12 is a block circuit diagram showing a fifth embodiment of the article inspection apparatus according to the present invention.

FIG. 13 is a flowchart 1 to diagram showing the operation of the embodiment of FIG. 12.

FIG. 14 is a block circuit diagram showing a sixth embodiment of the article inspection apparatus according to the present invention.

FIG. 15 is a block circuit diagram showing a seventh embodiment of the article inspection apparatus according to the present invention.

FIG. 16 is a preliminary flowchart showing the operation of the embodiment of FIG. 15.

FIG. 17 is a block circuit diagram showing an eighth embodiment of the article inspection apparatus according to the present invention.

FIG. 18 is a block circuit diagram showing a ninth embodiment of the article inspection apparatus according to the present invention.

FIG. 19 is a flowchart 1 to diagram showing the operation of the embodiment of FIG. 18.

FIG. 20 is a block circuit diagram showing a tenth embodiment of the article inspection apparatus according to the present invention.

FIG. 21 is a block circuit diagram showing an eleventh embodiment of the article inspection apparatus according to the present invention.

FIG. 22 is a flowchart 1 diagram showing the operation of the embodiment shown in FIG.

Section 23 is a block circuit diagram showing a twelfth embodiment of the article inspection device according to the present invention.

(Configuration of First Embodiment) First, the configuration of a first embodiment of the article inspection apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 3.

In addition, the article inspection apparatus according to the present invention includes an article conveying section 20 for conveying inspected articles (for example, seaweed, etc.; also simply referred to as articles) M one by one in the direction of the arrow.
and an article imaging section 30 which is disposed near the article conveyance section 20 and is configured to image the inspected article M being conveyed by the article conveyance section 20 and output an image signal P.

The article inspection apparatus 10 according to the present invention is also connected to an article imaging section 30 and outputs an image signal P of the article M to be inspected outputted from the article imaging section 30h). A foreign matter detection unit 40 is provided for detecting whether a foreign matter N is mixed or attached to M. The detection result of the foreign object detection section 40 is, for example, a defective inspected object (i.e. foreign object N or relatively It may also be used to individually remove M゛ (the same applies hereinafter) that has been mixed or adhered to the
It may also be applied to the defective rate calculation unit 60 to calculate and display or record the proportion of defective inspected articles M'' included in the inspected article group (ie, the defective rate of the inspected article group). Here, for the sake of explanation, "2. Detection results of the foreign object detection unit 40 ("), defective products are not removed.

The article inspection apparatus 1O according to the present invention further includes a g! ! j (= sign (for example, the recorded brightness signal signal ¥8.
A diffused reflection signal removal circuit 70 is provided for removing the erroneous relative chromaticity comparison signal (XN'). By the way, the diffuse reflection signal P
N is caused by the diffuse reflection of unwanted light on the surface of the inspected article M, and the diffused light is received by the imaging means 32 (to be described later), so that it is reflected in the image signal P. It will be included. Diffuse reflection signal P,.

Therefore, there is no periodicity in -.

Article conveying section 20 The article conveying section 20 includes a head pulley 2], a tail pulley 21, and a tail pulley 21. Bells 1 to 21 are arranged around the belt conveyor 21 to convey the inspected articles 1 to 1 one by one in the direction of the arrow, and a belt conveyor 2 is provided with a belt for removing defective articles. The inspected articles M, which are disposed through the section 50 and around the head pulley 22A and the sol pulley 22B and have not been removed by the defective article removing section 50, are directed to a subsequent processing device (not shown). (Zute 1
It is also provided with another belt conveyor 22 for conveying the belts one by one.

Article Imaging Unit 30 The article imaging unit 30 is disposed near the belt conveyor 21 and includes a sensor 31 for detecting the inspected article M when it is being conveyed and outputting an article detection signal f; An imaging means 32, such as a video camera or a line sensor camera, is arranged on one side and connected to the sensor 31, and is configured to take an image of the inspected article M being conveyed by the heald conveyor 21 in accordance with the article detection signal f. and a light source 33 for generating light (referred to as irradiation light) L, which is formed by a fluorescent lamp, a halogen lamp, a light emitting diode, or the like, and which illuminates the inspected article M being conveyed by the belt conveyor 21. .

Here, if the imaging means 32 includes a shutter that operates at a speed corresponding to the conveyance speed of the article M to be inspected by the article conveyor 20, it is possible to detect foreign matter N that has entered or landed on the article M to be inspected. Even if it is minute, it can be detected well.
preferable. At this time, when a fluorescent lamp is used as the light source 33, by applying a high frequency voltage between the electrodes via an impeller (not shown), the amount of irradiated light can be kept constant even if the shutter opening timing of the imaging means 32 is different. This is preferable because it can be maintained at

The article imaging section 30 is also arranged to surround the imaging means 32, and uses a light source 33 to suppress abnormal reflection (here, specular reflection) from the surface of the article M to be inspected or the surface of the foreign object N. ]8 A scattering member 34 for scattering the incident light and giving it as scattered light ρ to the inspected article M being conveyed by the belt conveyor 21, and surrounding the light source 33 and the scattering member 34 to block external light and Light shielding member 3 for suppressing irradiation light from leaking into the surrounding environment
5.

The scattering member 34 is made of a translucent material such as a translucent chemical synthetic resin (for example, translucent acrylic resin).

Since the light shielding member 35ij is not an essential element for the present invention, it may be removed if desired.

Foreign Object Detection Unit 40 The foreign object detection unit 40 is connected to the output end of the imaging means 32, and appropriately processes the image signal P of the inspected article M captured and output by the imaging means 32, and sends it to the delay circuit 31.
Goods delayed by A! ! A three primary color signal extraction circuit 41 for extracting three primary color signals Q (that is, a red signal R1, a green signal G, and a blue-violet signal B) in response to a signal f (this is referred to as a delayed article detection signal fM); and a three primary color signal extraction circuit. a luminance signal creation circuit 42 for creating a luminance signal Y from the three primary color signals Q (i.e., the red signal R1, the green signal G, and the blue-violet signal B), which is connected to the three primary color signal extraction circuit 41; Whether the inverting input terminal is connected to the output terminal of the luminance signal generation circuit 42, PL and the non-inverting input terminal is connected to the setting circuit 43A, and whether the luminance signal Y exceeds the set value YO of the setting circuit 43A. The brightness signal Y or its setting value Y is determined by determining the brightness signal Y or its set value Y.

The brightness comparison signal Y becomes high level only when it exceeds
and a comparison circuit 43 for outputting . The comparison circuit 43 sets the brightness 'l'y to the set value Y. The reason for the comparison is that low-level noise included in the luminance signal Y (i.e., abnormal reflection IRf on the surface of the inspected article M)
The purpose is to remove the noise caused by I (Fig. 5 (a)-(c) valley) and to avoid misidentifying the surface irregularities of the inspected article IX as the R article N.

The foreign object detection section Frog is also connected to the output end of the three primary color signal extraction circuit 41, and adds the three primary color signals Q (namely, the red signal R1, the green signal G, and the blue-violet signal B) to each other to generate the three primary color sum signal X ( The three primary color signal addition circuit 44 and the three primary color signal addition circuit 4 for producing R4-G 1B )
4 and the output end of the primary color signal extraction circuit 41, and the three primary color signals Q (that is, the red signal R
Relative chromaticity signals (i.e., three primary color relative chromaticity signals XI
IX1, XB; In detail, red relative chromaticity signal XRR/X
, green relative chromaticity signal x, = G/X and blue-violet relative chromaticity signal X, -B/X) and outputs the maximum one as relative chromaticity signal X; Arithmetic circuit 4
The inverting input terminal is connected to the output terminal of 5, and the non-inverting input terminal is connected to the setting circuit 46A. The maximum value of the signal x6 and the blue-violet relative chromaticity signal xll) is the setting value X of the setting circuit 46A. The relative chromaticity signal X or its set value
. A comparison circuit 46 for outputting a relative chromaticity comparison signal x1 which becomes a high level state only when the value exceeds the set value X is set (611). The reason for this is that low-level noise contained in the relative chromaticity signal The purpose is to remove the chromaticity deviation on the surface of the object to be inspected M to avoid construing it as a foreign substance N.

The foreign object detection unit 40 further includes a removal circuit 71 of the diffuse reflection signal removal circuit 70 for each of the output terminals of the comparison circuits 43 and 46.
．． The two input terminals are connected via the comparator circuit 43, and the removal circuit 71 outputs the rebate q= as the signal P.
The brightness comparison signal Y'' from which the false brightness comparison signal YN'' caused by
2, the misuse i1 chromaticity comparison signal X caused by the diffuse reflection signal P8
A signal combining circuit 47 is provided for appropriately combining the relative chromaticity comparison signal It is connected to the output terminals of the comparison circuits 43 and 46 via the removal circuits 71..72, and is used to create an AND signal Y''X'' of the luminance comparison signal Y'' and the relative chromaticity comparison signal X''. The circuit 47A and the two input terminals each have a removal circuit 71. ．． an OR circuit 47I3 connected to the output terminals of the comparison circuits 43 and 46 via 72 and for creating a logical sum signal Y''+X'' of the luminance comparison signal Y'' and the relative chromaticity comparison signal X''; The output terminal of the AND circuit 47A, the output terminal of the OR circuit 4713, the output terminal of the comparison circuit 43 (via the elimination circuit 71), and the output terminal of the comparison circuit 46 (via the elimination circuit 72) are connected to the output terminal of the first to fourth switching contacts, respectively. hand)
and is connected to the common contact or output terminal, and the AND signal Y''X'', the OR signal Y''+X'', and the brightness comparison signal Y
゛ and relative chromaticity comparison (g No.
It is equipped with a changeover switch 41C for outputting as an output signal.

The foreign object detection section 40 is also connected to the output terminal of the signal combination circuit 47 and the delay circuit 31A, and! : Counts the pulses (i.e., high level state) included in the combination signal Z given from the three signal combination circuit 47 and outputs the item M to be inspected.
The number of foreign substances contained in the cod is counted, and the counting result is sent to the counting signal W.
A counting circuit 48 whose counting contents are cleared in response to the delayed article detection signal fM after outputting the delayed article detection signal fM, and a counting circuit 48 which is connected to the output terminal of the counting circuit 48 and whose counting contents are A predetermined value W is determined by determining whether or not the count result (counting result) exceeds a predetermined value Wo. A foreign matter detection signal generation circuit 49 is provided for generating a foreign matter detection signal (2) when the foreign matter detection signal (2) exceeds the foreign matter detection signal (2). The foreign object detection signal (2) generated by the foreign object detection signal generation circuit 49 is output as the detection result of the foreign object detection section 40, and here, the foreign object detection signal (2) is output as a detection result of the foreign object detection section 40. It is given to the defective article removal section 50 for individually removing large inspected articles) M, and it is given to the defective rate calculation section 60 for calculating and displaying or recording the defective rate of a group of inspected articles. ing.

A switching fin 51 disposed between the conveyor belt 2 and the belt conveyor 22 is connected to the foreign object detection signal generation circuit 49 of the foreign object detection section 40, and is connected to the foreign object detection signal generation circuit 49 of the foreign object detection section 40, and detects a defective object in response to the foreign object detection signal ■. A drive unit (for example, a solenoid) 52 for driving the switching fin 51 as shown by arrow B to remove the article M'', and a drive unit 52 for accommodating the defective inspection object M'' removed by the switching fin 51. A storage box 53 and a transfer pulley that is disposed downstream of the switching fin 51 and is used to transfer the inspected articles M that have not been removed as defective inspected articles M+ from the switching fins 51 to the belt conveyor 22. 54.

Defective rate calculation section 60 The defective rate calculation section 60 is connected to the foreign object detection signal generation circuit 49 and the delay circuit 31A, and counts the number of occurrences of the foreign object detection signal "(1) and the number of occurrences of the delayed article detection signal fM, respectively. A calculation circuit 61 is connected to the calculation circuit 61 for calculating the defective rate of the group of articles to be inspected by dividing the count result of the number of occurrences of the foreign object detection signal V by the count result of the number of occurrences of the delayed article detection signal fi+. The calculation result (
A display device 62 for displaying the defective rate of the group of inspected articles) and a recording device 63 connected to the calculation circuit 61 for recording the calculation result (that is, the defective rate of the group of inspected articles). We are prepared. Incidentally, the defective rate calculation unit 60 may be configured to include a display device 62 and a recording device 63 as desired.
Either one of them may be removed. In addition, the defective rate calculated by the defective rate calculation unit is used for determining the grade of the group of articles to be inspected.

Diffuse reflection signal removal circuit 70 The diffuse reflection signal removal circuit 70 is inserted between the output terminal of the comparison circuit 43 and one input terminal of the signal combination circuit 47, and performs erroneous luminance comparison caused by the diffuse reflection signal PN from the luminance comparison signal Y+. A removal circuit 71 for removing the signal YN+ is inserted between the output terminal of the comparison circuit 46 and the other input terminal of the signal combination circuit 47, and is inserted between the output terminal of the comparison circuit 46 and the other input terminal of the signal combination circuit 47 to remove the signal YN+ from the relative chromaticity comparison signal X" caused by the diffuse reflection signal PN. and a removal circuit 72 for removing the erroneous relative chromaticity comparison signal XN''.

The removal circuit 71 has an input terminal connected to the output terminal of the comparison circuit 43, and is a delay circuit 71. a, one input terminal is connected to the output terminal of the comparison circuit 43, the other input terminal is connected to the output terminal of the delay circuit 71a, and the output terminal is connected to one input terminal of the signal combination circuit 47. The luminance comparison signal Y + y 2+ ′+ is connected to the luminance comparison signal Y + y 2+ ′+: Fig. 6 (l)
) and delay circuit 71. By calculating the AND between the luminance comparison signal Y"+"Y,"' shown in FIG.
It includes an AND circuit 71b for removing the erroneous brightness comparison signal YN'' caused by N.

The removal circuit 72 is a delay circuit whose input terminal is connected to the output terminal of the comparator circuit 46 and which delays the relative chromaticity comparison signal X by a time corresponding to one screen imaging time of the image signal P. 72a, one input terminal is connected to the output terminal of the comparator circuit 46, and the other input terminal is connected to the delay circuit 72a.
7 (1 ))reference)
and delay circuit 71. The logical product between the relative chromaticity comparison signal X and the delayed relative chromaticity comparison signal The erroneous relative chromaticity comparison signal XN. and an AND circuit 72b for removing .

(First Embodiment) Next, the operation of the first embodiment of the article inspection device according to the present invention will be explained in detail with reference to FIGS. 1 to 7. .

゛Image of the inspection object 0M is captured by the bell of the article conveyance section 20 [・Every time the inspection object M is conveyed in the direction of the arrow by the conveyor 21, the sensor 31 of the article imaging section 4 detects the inspection object M. Then, an article detection signal f is generated (step 1).

Upon receiving the article detection signal f, the image pickup means 32 in the article image pickup section starts capturing an image of the article to be inspected M, and starts transmitting the image signal P thereof (step 2).

In the article imaging section 30, the irradiation light generated by the light source 33 is scattered by the scattering member 34 and is applied as scattered light C to the second inspection article M on the belt conveyor 21. Foreign matter N mixed in or attached to the surface of the above inspected article M and the inspected article M
(Details include high-chroma foreign matter N.

When reflected on the surface of foreign matter NL with high chroma and foreign matter NL with low chroma, compared to the normal reflection (here regular reflection) R2゜RfL on the surface of foreign matter NL with high chroma and foreign matter NL with low chroma, It is possible to sufficiently reduce the amount of light with abnormal reflection (here regular reflection) R on the surface of M (see FIG. 5(a)).

Therefore, the image signal P includes the foreign object reflection signals P1, PL, which are at a significantly high level in response to only the foreign object N (that is, the foreign object NH with high shape and the foreign object NL with low saturation). However, when light is diffusely reflected on the surface of the inspected article M and enters the imaging means 32, the image signal P
For example, along with this, a diffuse reflection signal PN of a level comparable to the foreign object reflection signals p1, , p1 is also included (fifth
(See figure (b)).

Diffuse reflection of light on the surface of the inspected article M generally occurs irregularly and has no periodicity.
After a period of time (equivalent to the screen imaging time) has elapsed, the diffuse reflection signal PN disappears from the image signal P (Fig. 5(c)).
reference).

The image signal P of the article M to be inspected with the five-star color number q is given to the three primary color signal extraction circuit 41 of the foreign object detection section 40 . Three primary color signal extraction circuit 4
], the three primary color signals Q (namely, the red signal R1, the green signal G, and the blue-violet signal B) are extracted from the image signal P, and the luminance signal generation circuit 42. The signal is outputted to the three primary color signal addition circuit 44 and the division circuit 45 (step 2). Image signal P
includes the diffused reflection signal PN, so the three primary color signals Q include an erroneous signal caused by the diffused reflection signal PN.

Brightness - No. Y/Brightness comparison signal Y.

In the luminance signal generation circuit 42, the three primary color signals Q (i.e., the red signal R1, the green signal G, and the blue-violet signal B) are converted to desired coefficients α, β, and γ (however, α+β→−γ=1:0≦α,
β, γ≦1) and are added to each other as shown in the following equation, Y=aR+βG+γB, to obtain a luminance signal Y (step 3). Here, the coefficients aβ and γ may be deviated, for example, by α=γ=0.25g and β05. Since the three primary color signal Q includes an erroneous signal caused by the diffused reflection signal PN, the luminance signal Y also includes an erroneous signal (referred to as "erroneous luminance signal YN") caused by the diffused reflection signal PN.

After being appropriately delayed, the luminance signal Y is output to the comparison circuit 43 (step 4).

The comparison circuit 43 sets the luminance signal Y to a set value Y set by the setting circuit 43A. and its set value Y. A brightness comparison signal Y' which becomes a high level state only when the brightness signal Y is larger is generated and output (step 5). Since the brightness signal Y includes an erroneous signal caused by the diffuse reflection signal PN, the brightness comparison signal Y3 also contains an erroneous signal (referred to as "erroneous brightness comparison signal yN+") caused by the diffuse reflection signal PH. (See Figure 6(a)).

The brightness comparison signal Y'' output from the comparison circuit 43 is processed by the removal circuit 71 of the diffused reflection signal removal circuit 70 to generate an erroneous brightness comparison signal Y9. ``or removed.'' That is, in the removal circuit 71, the luminance comparison signal Y"f, that is, Y1") delayed by the delay circuit 71a by a time corresponding to the one-screen imaging time of the imaging means 32, and the luminance comparison signal Y"f that is not delayed by the delay circuit 71.a are compared. The AND with the signal Y' (that is, Y2') is performed by the AND circuit 71.
1), and the erroneous luminance comparison signal 'Y ++ 4 is removed (Step 6; Fig. 6 (at(bl? see)).
2'') includes foreign object luminance comparison signals Y1, '', Y, etc. corresponding to the foreign object reflection signal P+1.Pt (see FIG. 6(a) (see BL)).

= The primary color signal addition circuit 4.1 adds the three primary color signals Q (that is, the red signal R, the green signal G, and the blue-violet signal B) to each other and then outputs the resultant signal as the three primary color sum signal X (step 7). Since the three primary color signal Q includes an erroneous signal caused by the diffused reflection signal PN, the three primary color sum signal X also includes an erroneous signal caused by the diffused reflection signal PN.

The three primary color sum signal X outputted by the one primary color signal addition circuit 44 is given to the division circuit 45. The division circuit 45 divides the three primary color signals 0 (namely, the red signal R5, the green signal GJ3, and the blue-violet signal B) by the three primary color sum signal X to obtain the three primary color relative chromaticity signals XR, Xα, Xn (
For details, red relative chromaticity signal XR1 green relative chromaticity signal x 6
and a blue-violet relative chromaticity signal xll) are generated (step 8).

Three primary color relative chromaticity signals X calculated by the division circuit 45
R, X 1, The signal is applied to the comparison circuit 46 as a signal. Since the three primary color signals X include an erroneous signal caused by the diffused reflection signal PN, the eye-to-eye chromaticity signal X also contains an erroneous signal caused by the diffused reflection signal P6 (referred to as "erroneous relative chromaticity signal X4. It is included.

The comparison circuit 46 sets the relative chromaticity signal X to a set value X set by the setting circuit 46A. and its set value X. A relative chromaticity comparison signal X' that becomes high level only when the relative chromaticity signal X is larger is generated and output (step 9). Since the relative color signals M and X include an erroneous signal caused by the diffuse reflection signal PN, the relative chromaticity comparison signal A signal X ++ + ++) is included (span in FIG. 7(a)).

The relative chromaticity comparison signal X" output from the comparison circuit 46 is
The removal circuit 72 of the diffused reflection signal removal circuit 70 generates the diffused reflection signal P1. The erroneous relative chromaticity comparison signal X, ”l caused by
or removed2. That is, in the removal circuit 72, the relative chromaticity comparison signal The logical product with the chromaticity comparison signal
(see (b)). By the way, the relative chromaticity comparison signal is X+Niko's XN''', X2'')! ”, foreign object reflection signal P)1
, P
x,” (see Figure 7 Da+ ++))
.

Comparison circuit 43! ,: Therefore, the brightness comparison signal Y1 generated by the comparison circuit 46 and from which the erroneous brightness comparison signal YN' is removed by the removal circuit 71 of the diffuse reflection signal removal circuit 46, and the brightness comparison signal Y1 generated by the comparison circuit 46 and from which the erroneous brightness comparison signal YN' is removed by the removal circuit 72 of the diffuse reflection signal removal circuit 70. The relative chromaticity comparison signal X' from which the relative chromaticity comparison signal XN+ has been removed is appropriately combined in the signal combining circuit 47 and output as a combined signal Z. , (step 11).

The combination signal Z is compared in brightness with the logical product signal Y''X'' and the logical sum signal Y''+X'' according to which of the first to fourth switching contacts the common contact of the changeover switch 47G is in contact with. signal) and the relative chromaticity comparison signal X+.

Detection results of focus N9 and number sensor 31 (i.e. article detection A5)
is the delay circuit 31. After being appropriately delayed at A, the delayed article detection signal f is applied to the counting circuit 48 as the delayed article detection signal f, A (step 12).

The counting circuit 48 counts the pulses (i.e., high level state) included in the combination signal Z obtained from the signal combination circuit 47 for a predetermined period of time when the delayed article detection signal f is applied. The number of foreign substances N mixed into or attached to the inspection article M is counted (step 13).

The optical foreign object detection signal generation circuit 49 receives either the old number result W calculated from the counting circuit 48 or the set value W. It is determined whether the value is larger than (step 14).

Counting result \V or set value W. , the foreign object detection signal generation circuit 49 generates the foreign object detection signal V.

On the other hand, the count result W is the set value W. If it is smaller than , the foreign object detection signal generation circuit 49 does not generate the foreign object detection signal (2).

Therefore, the parabolic detection signal V generated by the foreign object detection signal generation circuit 49 is the detection result of the foreign object detection section 40.

It works.

Removal of defective inspection object M' When the foreign object detection signal generation circuit 49 generates the foreign object detection signal (2), the defective article removal section 50 moves the drive member 52 or the switching fin 51 by the arrow B according to the foreign object detection signal (2). As shown in FIG. 3, the inspection object M (inspection object M' having a defective condition) is stored in the storage box 53 (step 15).

When the foreign object detection signal ① is not generated from the foreign object detection signal generation circuit 49, the defective article removing section 50 outputs the driving section 5.
The article M to be inspected is transferred from the switching fin 51 to the belt conveyor 22 by the transfer pulley 54 without switching the switching fin 51.

Regardless of whether or not the foreign object detection signal ■ is generated from the foreign object detection signal generation circuit 49, in the defective rate calculation unit 60, the calculation circuit 61 calculates the number of occurrences of the foreign object detection signal ■ and the sensor 31. The defective rate of the group of inspected articles is calculated by dividing the count result of the foreign object detection signal ■ by the count result of the article detection signal f. (Step 16).

The defect rate of the inspected article group calculated by the calculation circuit 61 is displayed on the display device 62, and is also displayed on the recording device 63.
By recording the information, the information is used to judge the quality of the group of articles to be inspected (step 17).

Structure and Function of Second Embodiment Furthermore, with reference to FIG. 8, the structure and function of a second embodiment of the article inspection apparatus according to the present invention will be described in detail.

In the second embodiment, the removal circuit 71 of the diffused reflection signal removal circuit 70 inserted between the comparison circuit 43 and the signal combination circuit 47 or the removal circuit 71 of the diffused reflection signal removal circuit 70 inserted between the comparison circuit 43 and the signal combination circuit 47 or the removal circuit 71 of the , and the removal circuit 72 of the diffuse reflection signal removal circuit 70 inserted between the comparison circuit 46 and the signal combination circuit 47
The second embodiment has the same configuration as the first embodiment except that the second embodiment is inserted between the division circuit 45 and the comparison circuit 46.

Therefore, in the second embodiment, the diffuse reflection signal removal circuit 70
The removal circuit 71 extracts the diffused reflection signal P from the luminance signal Y.
11 (i.e., the erroneous luminance signal Y1.), and removes the erroneous signal (i.e., the erroneous relative chromaticity signal) from the relative chromaticity signal X by the removal circuit 72 of the diffused reflection signal removal circuit 70. This embodiment has the same functions as the first embodiment except that X4.) is removed.

Therefore, in order to simplify the explanation, the same reference numerals will be given to the parts or steps that correspond to the parts or steps included in the first embodiment, and other structures and operations will be described. The explanation of is omitted.

(Construction and Use of the Third Embodiment) Further, the structure and operation of the third embodiment of the article inspection apparatus according to the present invention will be described in detail with reference to FIGS. 9 and 10.

In the third embodiment, the three primary color signal addition circuit 44 or the signal combining circuit 47 are removed in the foreign object detection unit 40, and the output terminal of the comparison circuit 43 is connected to the input terminal of the counting circuit 48 to the removal circuit of the diffuse reflection signal removal circuit 70. It has the same configuration as the first embodiment except that it is connected via 71.

Therefore, in the third embodiment, the brightness comparison signal Y is outputted from the comparison circuit 43 and then removed by the removal circuit 71 of the diffuse reflection signal removal circuit 70 from which the erroneous brightness comparison signal YN'' is removed.
The counting circuit 48 counts only the first pulse (that is, the high level state) included in the first pulse, and according to the counting result, the defective inspected articles M' are removed, and the defective rate of the inspected article group is calculated. Except for this, the operation is the same as that of the first embodiment.

Therefore, for the sake of brevity, the same reference numerals will be given to the members or steps corresponding to those included in the first embodiment, and other structures and operations will be described herein. The explanation will be omitted.

(Structure and operation of the fourth embodiment) Furthermore, with reference to FIG. 11, the structure and operation of the fourth embodiment of the article inspection apparatus according to the present invention will be described in detail.

In the fourth embodiment, the removal circuit 71 of the diffuse reflection signal removal circuit 70 inserted between the comparison circuit 43 and the counting circuit 48 is inserted between the luminance signal generation circuit 42 and the comparison circuit 43. Except for this, it has the same configuration as the third embodiment.

Therefore, in the fourth embodiment, the diffuse reflection signal removal circuit 70
The removal circuit 71 converts the luminance signal Y into a diffuse reflection signal P,
Erroneous signal caused by 4 [i = h11 degree signal N
) has the same effect as the third embodiment, except that .

Therefore, in order to simplify the explanation, the same reference numerals are given to the members or steps corresponding to those included in the third embodiment, and other structures and operations will be explained. The explanation will be omitted.

(Structure and Use of Fifth Embodiment) In addition, the structure and operation of the fifth embodiment of the article inspection device according to the present invention will be explained in detail with reference to FIGS. 12 and 13. .

In the fifth embodiment, in the foreign object detection section 40, the brightness signal generation circuit 42. Comparison circuit 43. The setting circuit 43A and the signal combination circuit 47 are removed, and the output terminal of the comparison circuit 46 is connected to the counting circuit 48 by the removal circuit 7 of the diffuse reflection signal removal circuit 70.
It has the same configuration as the first embodiment except that it is connected via 2.

Therefore, in the fifth embodiment, the pulses included in the relative chromaticity comparison signal (i.e., a high level state) is counted by the counting circuit 48 to the number 12, and according to the counting result, the defective inspected articles M' are removed and the defective rate of the inspected article group is calculated. It has the same effect as the embodiment.

Therefore, for the sake of brevity, the same references will be made here to parts or steps that correspond to parts or steps included in the first embodiment. By assigning the number 1e, explanations of other configurations and functions will be omitted.

(Construction and Operation of Sixth Embodiment) In addition, with reference to Section 14, the configuration and operation of the sixth embodiment of the article inspection device according to the present invention will be described in detail.

In the sixth embodiment, except that the removal circuit 72 of the diffuse reflection signal removal circuit 70 inserted between the comparison circuit 46 and the counting circuit 48 is inserted between the division circuit 45 and the comparison circuit 46. , has the same configuration as the fifth embodiment.

Therefore, in the sixth embodiment, the diffuse reflection signal removal circuit 70
An error signal caused by the diffuse reflection signal P8 (i.e., rich relative chromaticity signal XN) is removed from the relative chromaticity signal X by the removal circuit 72
) is removed, but has the same effect as the fifth embodiment.

Therefore, for the sake of brevity, the same reference numerals will be used herein for parts or steps that correspond to parts or steps included in the fifth embodiment, and other structures and The explanation of the effect will be omitted.

(Structure of Seventh Embodiment) The structure of a seventh embodiment of the foreign matter inspection apparatus according to the present invention will be described in detail with reference to FIGS. 15 and 2.

The Shisho Kewei 10 is a foreign matter inspection device according to the present invention, and includes an article conveying section 20 for conveying inspected articles (for example, seaweed, etc.; also simply referred to as articles) M one by one in the direction of the arrow.
and an article imaging section recess, which is disposed near the article flIU transport section 20 and is configured to image the inspected article M being transported by the article transport section 20 and output an image signal P.

The wear of the foreign matter inspection device according to the present invention also occurs when the article imaging unit 3
By appropriately processing the image signal (■) of the inspected article M output from the article imaging unit 30, it is detected whether or not foreign matter N is mixed in or attached to the inspected article M. It is equipped with a foreign object detection section 40 for detecting foreign matter.

The detection result of the foreign object detection section 40 is, for example, that a defective inspected object (that is, a foreign object N or relatively It may be used to individually remove the inspected articles M'' that have been mixed or adhered to a large amount (the same applies hereinafter), or it may be used to individually remove the inspected articles M'' that are included in the group of inspected articles. It may also be used to calculate and display or record the percentage (that is, the defective rate of the group of inspected articles).

Here, for convenience of explanation, it is assumed that the detection results of the foreign object detection section 40 are given to the defective article removal section and the defective rate calculation section 60, but the present invention is not intended to be limited to this.

The article inspection device according to the present invention further includes a foreign object detection section 4.
Diffuse reflection removal circuit for removing erroneous signals (for example, erroneous relative chromaticity sum comparison signal XΔ8゛) caused by the diffuse reflection signal PN included in the image signal It has a rest area.

Article Conveying Unit 20 The article conveying unit 20 is disposed around the head pulley 21Δ and the tail pulley 2 and B, and carries the inspected article M.
A belt conveyor 21 for conveying the defective articles one by one in the direction of the arrow; The inspected articles M that were installed and were not removed by the defective article removal section 4
A second belt conveyor 22 is provided for conveying the sheets one by one toward a subsequent processing device (not shown).

Article Imaging Unit 30 The article imaging unit 30 includes a sensor 31 that is disposed near the belt conveyor 21, detects when the inspected article M has been conveyed, and outputs an article detection signal f; 21 and connected to the sensor 31, such as a video camera or a line sensor camera, for taking an image of the inspected article M being conveyed by the belt conveyor 21 in response to the article detection signal f. The belt conveyor 2 is formed by an imaging means 32, a fluorescent lamp, a halogen lamp, a light emitting diode, etc.
Light (
A light source 33 for generating irradiation light (referred to as irradiation light) L is provided. Here, if the imaging means 32 includes a shutter that operates at a speed corresponding to the conveyance speed of the article M to be inspected by the article conveyor 20, the article M to be inspected may be contaminated with
This is preferable because even if the foreign matter N that has arrived is minute, it can be detected well. At this time, when a fluorescent lamp is used as the light source 33, by applying a high frequency voltage between the electrodes via an inverter (not shown), the amount of irradiated light can be controlled even if the shutter opening timing of the imaging means 32 is different. This is preferable because it can be maintained constant.

The most imaged part 30 of the article 1 is also arranged so as to surround the imager P9, 32, and suppresses abnormal reflection (regular reflection) caused by the surface of the article M to be inspected or the surface of the foreign object N. A light source 338 and a scattering member 34 are provided for scattering the reflected light (1) given from the light source 33 and transmitting it as scattered light (a) to the inspected article M being conveyed by the belt conveyor 21. It is provided with a light shielding part 35 for enclosing and blocking outside light and suppressing light from leaking into the surrounding area. The scattering member 34 is
It is made of a translucent material such as a translucent chemical synthetic resin (for example, translucent acrylic resin).

Since the light shielding member 35 is not an essential element for the present invention, it may be removed if desired.

Foreign object detection section 40 The foreign object detection section 40 is connected to the output end of the imaging means 32, and appropriately processes the image signal P of the inspected article M captured and outputted by the imaging means 32, and delays the delay circuit 3
, A, and the three primary color signals Q according to the article detection signal f (this is called delayed article detection signal f1.l).
(i.e. red signal R1 green signal G and blue-violet signal B
) is provided with a three primary color signal extraction circuit 141 for extracting the three primary color signals. The three primary color signal l* output circuit 141 outputs the red signal R from the imaging-1) in response to the delayed article detection signal f.
9 Red signal extraction circuit 14 for extracting green signal G and blue-violet signal B] 1, A1, green signal extraction circuit 141
β, , ti and blue-violet signal extraction circuit 14], C+
The red signal take-out circuit 1.41-A1, the green one is connected to the output terminal of the take-out circuit 141Bl and the blue-violet signal take-out circuit 141C, and the red signal R
Clamp circuit 141A for appropriately clamping 5 green (=i5G and blue-violet signal ■3).

141B7b41C2 and clamp circuit 141A7.1
41B214H; At the output end of 2, 21. Red signal R1 green No. 18 G connected and clamped accordingly
and an amplifier circuit 1 for appropriately amplifying the blue-violet signal B.
41A, 14], R3b, and 41C3.

The foreign object detection unit 40 is also connected to the L; three output terminals of the three primary color signal extraction circuit 141, and sends the three color signals Q (i.e., the red signal R1, the recording color signal G, and the ↑h purple compensation signal L) to each other. A three primary color signal addition circuit 142 for adding together to create a three primary color sum signal A comparison circuit 143 is provided for outputting gate signals (Zunawai selection signals) gR, go, and ga according to the results of comparing the purple signals B) with each other. Gate signal g R, g α,
g n is normally 1, but is set to O when the corresponding three primary color signals Q reach the maximum.

The foreign object detection section 40 is further connected to the output end of the three primary color signal extraction circuit 141 and the output end of the three primary color signal addition circuit 142. The three primary color signals Q (i.e. red signal R1 green signal G and blue-violet signal B) are the three primary color sum signals X.
The chromaticity signal for (i.e., relative chromaticity signal) and multiplication circuits 144A, 144 for calculating the coefficient iτ1 and the blue-violet relative chromaticity signal γX3).
B2.144C2 etc., multiplication circuit 144A2.144B2
．． It is connected to the 114 output terminal of 144C2 and the output terminal of comparison circuit 143, and outputs gate signals gR, gα, gn.
Multiplying circuit 144A21411β, 1.44
The multiplication result of C2, that is, the coefficient a', the relative chromaticity signal aX,
Gate circuits 1.45A, 145β, 1.45C for passing R, B XG, Y
The relative chromaticity signals of the coefficients A and C that have passed through c are added to each other, and the relative chromaticity sum signal XΔ is calculated by the following calculation circuit 144. A), 1
44B1, 1446+ and division circuit 144A1.4
4β, , 1446, and outputs the desired signals for the relative chromaticity signal × (i.e., the red relative chromaticity signal XR, the green relative chromaticity signal an adder circuit 146 for calculating coefficients α, β, and γ; and a setting circuit 14 whose inverting input terminal is connected to the output terminal of the adder circuit 146 and whose non-inverting input terminal is connected
Relative chromaticity hole comparison signal Comparison circuit for outputting ゛】47
It is equipped with

Here, the reason why the comparison circuit 147 compares the relative chromaticity phase transmission Noise caused by abnormal reflection R etc.; Fig. 5 (aj
to (c)) to avoid misidentifying the deviation in chromaticity on the surface of the inspected article M as a foreign substance N.

In addition, the input end of the foreign object detection signal is connected to the output end of the comparison circuit 147 via a removal circuit 73 that is separate from the diffuse reflection signal removal circuit, and is outputted from the comparison circuit 147 and converted into the diffuse reflection signal PN by the removal circuit 73. The number of foreign substances N contained in the inspected article M is determined by counting the pulses (i.e., high level state) included in the relative chromaticity hole comparison signal XΔ+ which caused the relative chromaticity hole comparison signal XΔ and ゛. Say 1 count and g(
A counting circuit 14 in which the counting result is output as the number W to the stroke number A, and then the counting contents are cleared in response to the delayed article detection signal fM.
8 and a predetermined value W, which is connected to the output terminal of the counting circuit 148 and is the content (ie, counting result) of the counting signal W output from the counting circuit 148. It is determined whether the predetermined value W has been exceeded. A foreign matter detection signal generating circuit 149 is provided for generating a foreign matter detection signal (2) when the foreign matter detection signal (2) exceeds the foreign matter detection signal. The foreign object detection signal II generated by the foreign object detection signal generation circuit 149 is output as the detection result of the foreign object detection section 1o, and here, it is determined whether the defective inspected object (i.e., the number of foreign objects N mixed in or A defective rate calculation unit 60 is provided to the defective article removal unit for individually removing the inspected articles (with a large number of adhered articles) M, and is provided to the defective article removal unit 60 for calculating and displaying or recording the defective rate of the inspected article group. is leaning on.

Defective article removal section 50 The defective article removal section 50 uses a switching fin 51 disposed between the belt conveyor 21 and the belt conveyor 22 of the article 1 transport section 20 and a foreign object detection signal generation of the foreign object detection section 40. Connected to circuit 149, 11 and f9 object detection signal ■
A driving member (for example, a solenoid) 52 for driving the switching fin 51 to remove the defective inspection object M'' according to the switching fin 51; storage box 5
3, and a transfer boot which is disposed on the downstream side of the switching fin 51 and is used to transfer the inspected article M that has not been removed as a defective inspected article M'' from the switching fin 51 toward the Hell J conveyor 22. It is equipped with 5.1.

Defective Rate Calculation Unit 60 The defective rate calculation unit 60 is connected to the output end of the foreign object detection signal generation circuit 149 and the output end of the delay circuit 31A, and calculates the generation cycle of the foreign object detection signal (■) and the delayed article detection signal fM.
After counting the number of emitted signals L [1] of the object detection signal f (and eventually the number of occurrences of the object detection signal f), divide the count result of the raw number of foreign object detection signals V by the result of counting the number of occurrences of the object detection signal f to be inspected. a calculation circuit 61 for calculating the defective rate of a group of articles; a display device 62 connected to the output terminal of the calculating circuit 61 for displaying the calculation result (i.e., the defective rate of the group of articles to be inspected); It is connected to the output terminal of the circuit 61 and calculates the result (i.e., defective rate of the group of inspected articles).
It is equipped with a record H4 (position 63) for recording the temperature of
Either one of the recording device 63 and the recording device 63 may be removed.

In addition, the defective rate calculated by the defective rate calculation unit is used for sorting out the group of articles to be inspected.

Diffuse reflection signal removal circuit 7° Diffuse reflection signal removal circuit 70 is inserted between the output terminal of the comparator circuit 147 and the input terminal of the counting circuit 148, and converts the relative chromaticity hole comparison signal XΔ+ to the diffuse reflection signal P N. It is equipped with a removal circuit 73 for removing the erroneous relative comparison number X ((x'') caused by the error.

The removal circuit 73 has an input terminal connected to the output terminal of the comparison circuit 147, and is used to delay the relative chromaticity sum comparison signal XΔ+ for a time corresponding to one screen imaging time of the image signal P. One input terminal of the delay circuit 73a is connected to the output terminal of the comparison circuit 147, and the other input terminal is connected to the output terminal (b'' of the delay circuit 73a and the output terminal is connected to the input terminal of the power counting circuit 148. It is connected to the end ('1) and is connected to the relative chromaticity phase comparison unit No. 8 XΔ+ and the delay circuit 13a.
) delayed,! −1 and the relative chromaticity sum LL comparison signal XΔ+ to remove the 55 relative chromaticity sum comparison signal Logic fl[i”] path 73b
It encompasses.

(Operation of Seventh Embodiment) In addition, with reference to FIGS. 15, 16, and 2, the operation of the seventh embodiment of the foreign object inspection device according to the present invention will be explained in detail. do.

Image of the inspected article M Every time the inspected article M is conveyed in the direction of the arrow by the belt conveyor 21 of the article conveying section 20, the sensor 31 of the article imaging section 30 detects the inspected article M and A detection signal f is generated (step 1).

When receiving the article detection signal f, the image capturing means 32 of the article image capturing unit starts capturing an image of the inspected article IIA and starts transmitting the image signal P thereof (step 2).

In the article imaging unit 30, the irradiation light generated by the light source 33 is scattered by the scattering member 34 and then applied as scattered light ρ to the inspected article M on the belt conveyor 21. When the surface of the article M and the surface of the foreign matter N mixed or attached to the inspected article M (specifically, the foreign matter N with high chroma and the foreign matter N with low chroma) are violated, the foreign matter No. with high chroma and the foreign matter N with low chroma are detected. Normal reflection (here, specular reflection) on the surface of the foreign substance Nl R
Compared to the light intensity of f1, . Therefore, the image signal P is
This includes the foreign object reflection signals P, (, PL) that reach a significantly high level state only in response to the foreign object N (that is, the foreign object N11 with high chroma and the foreign object NL with low chroma). When diffused reflection of light occurs on the surface and enters the imaging means 32, the image signal P will also include a diffused reflection signal PN at a level comparable to the foreign object reflection signals p1, p1. Diffuse reflection of light falling on the surface of hq generally occurs irregularly and has no periodicity, so after a predetermined period of time (for example, the time equivalent to one screen image capturing time), the diffuse reflection signal PN or the image signal P disappears. 1, 0 0 .

Further, the article detection signal f outputted by the sensor 31 is appropriately delayed by the delay circuit 31A in accordance with the time required for the inspected article M to communicate with the article imaging section 30, and a delayed article detection signal fM is generated. (Step 3).

The image signal P of the object to be inspected M from which the three primary color snow layer Q has been extracted is transmitted to the red signal extraction circuit 14 included in the three primary color signal extraction circuit 1.41 of the foreign object detection section 40.
1. A1, green signal extraction circuit], 41. B+ and blue-violet signal take-out circuit 1.4], given to C+.

Red signal extraction circuit 141A), green signal extraction circuit 141
β and the blue-violet signal extraction circuit 1.41c extract the three primary color signals Q (namely, the red signal, the green signal G, and the blue-violet signal B) from the image signal P, and when the delayed article detection signal fi+ is given. , clamp circuit 141A2.1
Output to 41.82.141C2 (Step 4
).

The clamp circuit 141A2b41B2.141c2 is
After appropriately clamping the red signal R1, the green signal G, and the blue-violet signal B, the amplifier circuit 141A3.141
B.

141, C, (step 5).

Amplifying circuit], 41, A3.1.41B3.1 In the old C3, the clamp circuit 141A2.14] After suitably amplifying the red signal R1, the green signal G, and the blue-violet signal B, which have been appropriately clamped by the 82141C2, circuit 14
2. Comparison circuit 143 and division circuit 144A1, 144
β, , 144C, (step 6). Since the image signal P includes the diffuse reflection signal P8, the three primary color signal Q includes an erroneous signal caused by the diffuse reflection signal PN.

Mihara hue language? The Lx output adder circuit 142 connects the output end of the three primary color signal extraction circuit 141 (that is, the amplifier circuit 141A3.14), 83.141
．． By adding together the three primary color signals Q (i.e. red signal R1 green signal G and blue-violet signal B) given from the output terminal of C; 3, the three primary color sum signal X=R+G+B
is calculated (step 7). Since the three primary color signal Q includes an erroneous signal caused by the diffused reflection signal PN, fl, the three primary color sum signal X also contains an erroneous signal caused by +1''+9 in the diffused reflection signal PN.

For France ''''XIl, X1, ,
141β,, 141. The three primary color signals Q (i.e. red signal R5 green signal G, I-
A relative chromaticity signal X (that is, a red relative chromaticity signal B8) is obtained by dividing the three primary color sum signals X=R+G+H given from the adder circuit 142.

Since the three primary color sum signal X includes an error signal caused by the diffuse reflection signal PN, the relative chromaticity signal X also includes the diffuse reflection signal P,
Contains an erroneous signal caused by 4.

The relative chromaticity signal X (i.e. red relative chromaticity signal x6, green relative chromaticity signal X6 and blue-violet relative chromaticity signal XB) is
Multiplication circuit 144A2.1. By multiplying appropriate coefficients α, β, and γ in lNB2.144C2, the coefficients (=1 relative chromaticity signal aX, Rl βX.

It is output as γX8 (step 9). Coefficients α, β,
γ is appropriately determined depending on the difference in color between the inspected article M and the foreign object I.

In the three primary colors RG B mutual ratio/comparison circuit 143, the output terminal of the three primary color signal extraction circuit 141 (that is, the amplifier circuit 14), A3.141B3.1.
41. The three primary color signals Q (i.e. red signal R, green signal G and blue-violet signal B) given from the output terminal of C3 are compared with each other, and the gate signal g1 is output according to the comparison result.
1. Output g α, g B (step 10.
], 1. ).

The values of the gate signals gR, gc, and gn are usually 1, except that the corresponding three primary color signals Q are O when they are at their maximum.
It is.

Coefficient side relative chromaticity signal aX Rl /3 X output from output multiplication circuit 144A2.144B2.1.44c, 2 of relative chromaticity sum signal X
a + Y X n is a gate circuit 1.45A; 1.
45β, at 1.45C, gate signal g+1, g
selected appropriately by c, gn (and by extension, f
``1.) After that, r:J is added to the adder circuit】46 (
Step 12).

In the adder circuit 146, gate circuits 145A, 1115
Relative chromaticity signal αXR6β with coefficient passed through 8.145C
x6゜γX5 are added together, and the relative chromaticity sum signal
RαX++ +ga BXa +ge 1'X+1 is output (step 13). Since the relative chromaticity signal X includes an error signal caused by the diffuse reflection signal PN, the relative chromaticity sum signal )It is included.

The relative chromaticity sum signal XΔ is applied to the inverting input terminal of the comparison circuit 147, and the setting value X is applied to the non-inverting input terminal from the setting circuit 147A. (step 14).

The comparison result in the comparison circuit 147 is output as a relative color space charge comparison signal x5+. Since the relative chromaticity sum signals X and 6 include an erroneous signal caused by the diffuse reflection signal P++, the relative chromaticity sum signal signal Seating fee comparison signal x11)°°
) is included, and the relative chromaticity sum comparison signal X 4 outputted from the comparison circuit 147 is removed by the removal circuit 73 of the diffuse reflection signal removal circuit 70 to eliminate the misuse versus interference comparison signal be done. That is, the removal circuit 73 calculates the relative chromaticity comparison signal XΔ which is delayed by the delay circuit 73a by a time corresponding to one screen imaging time of the imaging means 32+the relative chromaticity sum which is not delayed by the delay circuit 73a. The logical product between the comparison signal x and the comparison signal x is calculated by the logical product circuit 731), and the signal is removed from the comparison signal X (step 15). Incidentally, the relative color pigment comparison signal X includes foreign matter relative color pigment comparison signals X IH, X g corresponding to the foreign matter reflection signals PH, P1, .

The count circuit 148 for counting the number of foreign objects N is connected to the delay circuit 31. When a delayed article detection signal is given from A, the comparator circuit 147
The number of foreign substances N mixed in or attached to the inspected article M is counted by counting the number of pulses (that is, high level state) included in the relative color pigment comparison signal XΔ+ given from (step 16).

In the foreign object detection signal generation circuit 149, the count result \V obtained from the counting circuit 148 is the set value W. It is determined whether the value is larger than (step 17).

The counting result yt is the set value W. , the foreign object detection signal generation circuit 149 generates a foreign object detection signal (2).

On the other hand, the counting result W or the set value W. If the foreign object detection signal generating circuit 149 is smaller than j
does not occur.

Therefore, the foreign object detection signal ■ generated by the foreign object detection signal generation circuit 149 functions as the detection result of the foreign object detection section 40.

Removal of defective inspection object M' When the foreign object detection signal generation circuit 149 generates the foreign object detection signal I, the defective object removing section 50 causes the drive member 52 to switch the switching fin 51 in response to the foreign object detection signal ■. is switched as shown by the arrow B, and the article to be inspected M (that is, the defective article to be inspected M'') is stored in the storage box 53 (step 18).

When the foreign object detection signal ① is not generated from the foreign object detection signal generating circuit 49, the defective article removing section 50 does not switch the switching fin 51, and the transfer pulley 54 switches the switching fin 51 to the inspected object N4. It is then transferred from the fin 51 toward the belt converter 22 (step 19).

Foreign object detection signal generation circuit for calculating defective rate q - Foreign object detection from 19 (= -'y
Regardless of whether v is generated or not, the defective rate calculation unit 6
0, the calculation circuit 61 or the number of occurrences of the foreign object detection signal V and the delay circuit 31. Delayed article detection signal f1 given from A
．． After counting the number of occurrences of the foreign object detection signal (51'IA) and the number of occurrences of the object detection signal (f), the result of the foreign object detection signal (■) is divided by the counting result of the object detection signal (f).
The defect rate of the group of articles to be inspected is calculated (step 20).

The defect rate of the inspected article group calculated by the calculation circuit 61 is displayed on the display device 62, and is also displayed on the recording device 63.
By recording "J" in the table, it is possible to judge the quality of the group of articles to be inspected (swamp 21).

(Structure and Use of Eighth Embodiment) In addition, with reference to FIG. 17, the structure and operation of an eighth embodiment of the foreign matter inspection apparatus according to the present invention will be described in detail.

In the eighth embodiment, the removal circuit 73 of the diffuse reflection signal removal circuit 70 is inserted between the comparison circuit 147 and the counting circuit +48.
It has the same configuration as the seventh embodiment, except that it is inserted between the adder circuit 146 and the comparator circuit +47.

Therefore, in the eighth embodiment, the diffuse reflection signal removal circuit 70
Same operation as the seventh embodiment except that the removal circuit 73 removes the erroneous signal caused by the diffused reflection signal PN (that is, the erroneous relative chromaticity sum signal Xt, N) from the relative chromaticity sum signal X/l. is doing.

Therefore, in order to simplify the explanation, here, the same reference numbers H and H are given to the members or steps corresponding to the first member or step included in the seventh embodiment. A detailed explanation of the structure and operation will be omitted.

(Structure and operation of the ninth embodiment) Furthermore, the structure and operation of the ninth embodiment of the foreign matter inspection device according to the present invention will be explained in detail with reference to FIGS. explain. For convenience, when the item M to be inspected is a moving piece, the color of the item M to be inspected is strongly reddish, and the color of foreign matter (such as small pieces of paper, scraps of netting, or scraps of wood) N is greener than that of the article M to be inspected. Alternatively, a case will be described in which the foreign object N is detected without using the red relative chromaticity signal XR because it has a static purple color.

In the ninth embodiment, the comparison circuit 143. Division circuit 144A
Multiplier circuit 1.44A2 and gate circuit 145A, 1
It has the same structure as the seventh embodiment except that 45β and 145c are removed.

Therefore, in the ninth embodiment, the green relative chromaticity signal X6 and the blue-violet relative chromaticity signal
The relative chromaticity sum signal Xf1 is created by adding them together at an appropriate ratio according to the difference in color between them. 1-1
Ihara! from the relative chromaticity comparison signal XΔ+ by the removal circuit 73 of the signal removal circuit 70! 1=tf(i) Erroneous signal caused by N (i.e., sum comparison signal XΔ,゛)
The operation is the same as that of the seventh embodiment except that .

Therefore, in order to simplify the explanation, herein, the same reference numerals will not be used for parts or steps corresponding to the first part or steps included in the seventh embodiment. Structure of the Pond" 3. Detailed explanation of the invention will be omitted.

In addition, in the above, red relative chromaticity (U
The present invention is not limited to this case, but the green relative chromaticity signal X6 or the blue relative chromaticity signal This also includes the case where the violet relative chromaticity signals X and B are not used.

(Structure and operation of tenth embodiment) Also, with reference to FIG. 20, the structure and operation of the tenth embodiment of the foreign matter inspection apparatus according to the present invention will be described in detail.

In the tenth embodiment, a diffuse reflection signal removing circuit 73 or an adding circuit 1 inserted between a comparison circuit 147 and a counting circuit 148 is used.
- It has the same configuration as the ninth embodiment except that it is inserted between +6 and the comparison circuit 147.

Therefore, in the tenth embodiment, the diffuse reflection signal removal circuit 7
The relative chromaticity sum signal X is generated by the zero removal circuit 73.

The 9th
It has the same effect as the embodiment.

Therefore, in order to simplify the explanation, parts corresponding to the members or steps included in the ninth embodiment will be explained here.
By assigning the same reference numerals to 1 or steps, detailed explanations of other structures and operations will be omitted.

(Construction and operation of the eleventh embodiment) Finally, with reference to FIG. 21 and FIG. Explain in detail. Here, for convenience, the color of the inspected article M is strongly red and blue-violet, and the foreign substance N is greenish compared to the inspected article M. chromaticity signal x
A case will be described in which the detection of a foreign object N is performed using 4f(, 8).

In the eleventh embodiment, the comparison circuit 143. 4Δ1 with division circuit
It has the same structure as the seventh embodiment except that the adder circuit 146 is removed in addition to the multiplier circuits 144A2b, 44C2 and the gate 1 circuit 145A 1458145c.

Therefore, the eleventh embodiment is green Japanese j chromaticity Jingo X
6 is amplified at an appropriate rate according to the difference in color between the inspected article M and the foreign substance N to create a relative chromaticity signal X,
The seventh method except that the erroneous signal caused by the diffuse reflection signal PN (that is, the erroneous relative chromaticity comparison signal X, , '') is removed from the relative chromaticity comparison signal Implementation (has the same meaning as column).

Therefore, here, in order to simplify the explanation, reference numbers will be used for the members or steps that correspond to the parts or steps included in the seventh embodiment.
Therefore, detailed explanations of other configurations and functions will be omitted.

In addition, in the above description, the case where the red relative chromaticity signal X3 and the blue-violet relative chromaticity signal XN. l and green relative chromaticity signal X. Alternatively, the case where neither the green relative chromaticity signal XG nor the blue-violet relative chromaticity signal XB is used is also included.

(Configuration and operation of the twelfth embodiment) Incidentally, the configuration and operation of the twelfth embodiment of the article inspection apparatus according to the present invention will be described in detail with reference to FIG. 23.

In the twelfth embodiment, a diffuse reflection signal removing circuit 73 or a multiplication circuit 1 inserted between a comparison circuit 147 and a counting circuit 148 is used.
It has the same configuration as the eleventh embodiment except that it is inserted between the comparison circuit 147 and the comparison circuit 147.

Therefore, in the twelfth embodiment, the diffuse reflection signal removal circuit 7
0 removal circuit 73 removes an error signal caused by the diffuse reflection signal PN from the relative chromaticity signal X (i.e., the error relative chromaticity signal
7. ) has the same effect as the eleventh embodiment, except that .

Therefore, for the sake of brevity, the same reference numerals will be used herein for elements or steps corresponding to elements or steps included in the eleventh embodiment, and other configurations will be referred to herein as 4-1. and a detailed explanation of its effects will be omitted.

(3) Effects of the Invention As is clear from the above, the article inspection device according to the present invention has the configurations listed as the first to sixth solutions in the [Means for solving problems] column. (1) It has the effect of being able to remove the erroneous signal accompanying the diffuse reflection signal of the image signal, and furthermore, (11) it has the effect of improving the inspection accuracy of 9 objects mixed in or attached to the inspected article.

The article inspection device according to the present invention [Means for solving problems]
In particular, since it has the configurations mentioned as the fourth to sixth solution means in the column, in addition to the effects of fi) (j, l) above, fiii) on the inspected article? It has the effect of being able to detect foreign matter on the surface of the object by utilizing the difference in color between it and the object to be inspected (1). "More effective" - has the effect of being more effective.

[Brief explanation of the drawing]

1st section C:j, a block circuit diagram for showing the first embodiment of the article inspection device according to the present invention, FIG. 2 is a partially cutaway perspective view for enlarging and showing a part of the embodiment in FIG. 3 is a partial block circuit diagram showing an enlarged part of the embodiment shown in FIG. 1, FIG. 4 is a flowchart showing the operation of the embodiment shown in FIG. 1, and FIG. (c] is an explanatory diagram for explaining the operation of the embodiment in Section 1)]G is an explanatory diagram for explaining the operation of the embodiment in FIG. ) (i)
) is an explanatory diagram for explaining the operation of the embodiment in FIG.
9 is a block circuit diagram showing a second embodiment of the article inspection device according to the present invention, FIG. 9 is a block circuit diagram showing a third embodiment of the article inspection device according to the present invention, and FIG. 9 is a flowchart showing the operation of the embodiment, FIG. 11 is a block circuit diagram showing a fourth embodiment of the article inspection apparatus according to the present invention, and FIG. 12 is an article inspection apparatus according to the present invention. FIG. 13 is a block circuit diagram showing the fifth embodiment of the inspection device, FIG. 13 is a flowchart showing the operation of the embodiment in FIG. 12, and FIG. 14 is a sixth embodiment of the article inspection device according to the present invention. A block diagram showing an example,
FIG. 15 is a block circuit diagram showing a seventh embodiment of the article inspection device according to the present invention, FIG. 16 is a flowchart 1 diagram showing the operation of the embodiment in FIG. 15, and FIG. FIG. 18 is a block circuit diagram showing an eighth embodiment of the article inspection device according to the present invention; FIG. 18 is a block circuit diagram showing the ninth embodiment of the article inspection device according to the present invention;
9 is a flowchart 1 diagram showing the operation of the embodiment shown in FIG. 18, and FIG.
21 is a block circuit diagram showing an eleventh embodiment of the article inspection device according to the present invention; FIG. 22 is a block circuit diagram showing the operation of the embodiment of FIG. 21; FIG. FIG. 23 is a block circuit diagram showing a twelfth embodiment of the article inspection apparatus according to the present invention. 20 ・ 21, A ・ 21, B 2A 2B Article inspection device / Article conveyance section Belt conveyor / Head pulley Tail pulley To the belt conveyor Lad pulley / Tail pulley Article image section sensor 31A ... . . . Delay circuit 32 ... . . .・Imaging means 33・・
... light source 34 ... ... scattering member 35 ...
・ ・ ・ Light shielding member 40 ・ ・ ・ ・
... Foreign object detection section 41 ... ... Three primary color signal extraction circuit 42 ... ... Luminance signal creation circuit 43 ... ... Comparison circuit 43A
... Setting circuit 44 ... Three primary color signal addition circuit 45
・・ −・・・ ・・割算回路４６・・・ ・ ・ ・比較回路４６Ａ ・・・・・・ ・設定回路４７・・・ ・・ 信号組合回路４８・・・ ・・・ ・ ・計数回路49...
... Foreign object detection signal generation circuit 141 ...
・ ... Three primary color signal extraction circuit 1.41A, ...
・ ・Red signal extraction circuit 1, 41 B , ・ ・
- Green signal extraction circuit 1, 41. C.I.
Blue-violet signal extraction circuit 1.41/12.1.41. B
2]41C2... Clamp circuit 1.41A3]41. B31.41. C3 amplifier circuit 1112 - Addition circuit 143 - Comparison circuit 144A1, 144B1, 144CI - Division circuit 14
4A1,, 144B2.144c2・Multiplication circuit 145
A, 145β, 1.45C・Gate circuit 146...
・ ・ ... Addition circuit 147 ・ ... ... Comparison circuit 147A
- Setting circuit 148 - Counting circuit 149 - Foreign object detection signal generation circuit 50
. . . . Defective article removal section 51.
・Switching fin 52・ ・・
- Drive member 53, storage box 54, transfer pulley

Claims (1)

[Scope of Claims] (1) By processing an image signal obtained by capturing an image of the inspected article being conveyed by the article conveying section by the article imaging section, it is possible to determine whether foreign matter is mixed in or attached to the inspected article. In an article inspection device for inspecting the The input terminal is connected to the three primary color signals R, G, B given from the three primary color signal extraction circuit (41).
(c) The input end is connected to the output end of the brightness signal creation circuit (42), and the brightness signal Y exceeds the set value. (d) a comparison circuit (43) for outputting a brightness comparison signal Y^+ which becomes a high level state only when the brightness signal Y exceeds a set value by determining whether or not the brightness signal Y exceeds a set value; The input terminal is connected to the output terminal of the counting circuit (48), and the counting circuit (48 ) and (e) the output terminal of the luminance signal generation circuit (42) and the comparison circuit (
43) or between the output end of the comparator circuit (43) and the input end of the counting circuit (48), and is inserted between the input end of the comparator circuit (43) and the input end of the counting circuit (48), and is inserted between the input end of the comparator circuit (43) and the input end of the counting circuit (48). a diffused reflection signal removal circuit (71) for removing the erroneous brightness signal Y_N or the erroneous brightness comparison signal Y_N^+ accompanying the diffused reflection signal; and (f) an input end connected to the output end of the counting circuit (48). and a foreign object detection signal generation circuit (49) for generating a foreign object detection signal V when the counting result of the counting circuit (48) exceeds a predetermined value. (2) The luminance signal Y consists of three coefficients α, β, and γ whose sum is 1 and whose value is greater than or equal to 0 and less than or equal to 1, and the three primary color signals R and G.
, B, and expressed as αR+βG+γB, according to claim (1). (3) The diffuse reflection signal removal circuit (71) has an input terminal connected to the output terminal of (i) the luminance signal generation circuit (42) or the output terminal of the comparison circuit (43), and A delay circuit (71a) for delaying the comparison signal Y^+ by one screen imaging time of the image signal, and (ii) the output terminal of the luminance signal generation circuit (42) or the output terminal of the comparison circuit (43). One input terminal is connected, the other input terminal is connected to the output terminal of the delay circuit (71a), and the output terminal is connected to the input terminal of the comparator circuit (43) or the input terminal of the counting circuit (48). The brightness signal Y or the brightness comparison signal is calculated by calculating the AND between the brightness signal Y or the brightness comparison signal Y^+ and the brightness signal Y or the brightness comparison signal Y^+ delayed by the delay circuit (71a). It is characterized by including an AND circuit (71b) for removing an erroneous luminance signal Y_N or an erroneous luminance comparison signal Y_N^+ accompanying a diffuse reflection signal in an image signal from the signal Y^+. Claim No. 1
) or (2). (4) Inspecting whether or not foreign matter is mixed in or attached to the inspected article by processing the image signal obtained by imaging the inspected article being conveyed by the article conveying section by the article imaging section. In the article inspection apparatus, (a) a three primary color signal extraction circuit (41) for extracting three primary color signals R, G, and B from an image signal, and (b) an input terminal for the output end of the three primary color signal extraction circuit (41). are connected, and the three primary color signals R, G, B given from the three primary color signal extraction circuit (41)
(c) for the output end of the three primary color signal extraction circuit (41) and the output end of the three primary color signal addition circuit (44) for adding together the three primary color signal sum signals X. By dividing the three primary color signals R, G, B by the three primary color sum signal X, the three primary color relative chromaticity signals X_R, X_G,
A division circuit (45) for calculating _B and outputting the maximum value as a relative chromaticity signal @X@; and (d) an input terminal connected to the output terminal of the division circuit (45). The relative chromaticity comparison signal @X＾ determines whether the relative chromaticity signal @X@ exceeds the set value and becomes a high level state only when the relative chromaticity signal @X@ exceeds the set value. (e) The input terminal is connected to the output terminal of the comparison circuit (46) for outputting +@, and the input terminal is connected to the output terminal of the comparison circuit (46) for outputting the relative chromaticity comparison signal @X^+@. a counting circuit (48) for counting foreign matter mixed in or attached to the inspected article by counting high level states; (f) an output terminal of the division circuit (45) and an input terminal of the comparison circuit (46); or between the output terminal of the comparison circuit (46) and the input terminal of the counting circuit (48), and the image signal is output from the relative color signal @X@ or the relative chromaticity comparison signal @X^+@. Diffuse reflection signal removal circuit (72) for removing the erroneous relative chromaticity signal @X_N@ or erroneous relative chromaticity comparison signal @X_N@ accompanying the diffuse reflection signal in and a foreign object detection signal generation circuit (49) for generating a foreign object detection signal V when the counting result of the counting circuit (48) exceeds a predetermined value. An article inspection device characterized by: (5) The diffuse reflection signal removal circuit (72) is connected to (i) the output terminal of the division circuit (45) or the comparison circuit (45).
6) The input terminal is connected to the output terminal of (ii) the output terminal of the division circuit (45) or the comparison circuit (
One input terminal is connected to the output terminal of the comparator circuit (46), the other input terminal is connected to the output terminal of the delay circuit (72a), and the output terminal is connected to the input terminal of the comparator circuit (46) or the counting circuit (46). 48), and is connected to the input terminal of the relative chromaticity signal @X@ or the relative chromaticity comparison signal @X^+@ and the delay circuit (72a).
From the relative chromaticity signal @X@ or the relative chromaticity comparison signal @X^+@ by calculating the AND between the relative chromaticity signal @X@ or the relative chromaticity comparison signal @X^+@ delayed by Erroneous relative chromaticity signal @X_N@ or erroneous relative chromaticity comparison signal @X_ accompanying the diffuse reflection signal in the image signal
and an AND circuit (72b) for removing N@.
) Article inspection device described in item 2. (6) By processing the image signal obtained by capturing an image of the inspected article being conveyed by the article conveyance section with the article imaging section, it is inspected whether or not foreign matter is mixed in or attached to the inspected article. In the article inspection device, (a) a three primary color signal extraction circuit (41) for extracting three primary color signals R, G, and B from an image signal, and (b) an input end for the output end of the three primary color signal extraction circuit (41). The three primary color signals R, G, B are connected and given from the three primary color signal extraction circuit (41).
(c) The input end is connected to the output end of the brightness signal creation circuit (42), and the brightness signal Y exceeds the set value. (d) three primary color signals; The input terminal is connected to the output terminal of the extraction circuit (41), and the three primary color signals R, G, B given from the three primary color signal extraction circuit (41) are connected to the output terminal of the extraction circuit (41).
(e) to the output end of the three primary color signal extraction circuit (41) and the output end of the three primary color signal addition circuit (44). By dividing the three primary color signals R, G, B by the three primary color sum signal X, the three primary color relative chromaticities X_R, X_G, X_B are
and (f) an input terminal is connected to the output terminal of the division circuit (45). , a relative chromaticity comparison signal @X＾+ that determines whether the relative chromaticity signal @X exceeds the @ set value and becomes a high level state only when the relative chromaticity signal @X @ exceeds the set value. a second comparator circuit (46) for outputting @; (g) an input terminal connected to the output terminal of the first comparator circuit (43) and the output terminal of the second comparator circuit (46); a signal combination circuit (47) for combining the luminance comparison signal Y^+ and the relative chromaticity comparison signal @X^+@ to create and output a combination signal Z; (h) luminance signal creation; between the output terminal of the circuit (42) and the input terminal of the first comparator circuit (43) or the first comparator circuit (
43) and the input end of the signal combination circuit (47), and detects the error luminance signal Y_N or a first diffuse reflection signal removal circuit (71) for removing the false brightness comparison signal Y_N^+; (i) an output terminal of the division circuit (45) and a second comparison circuit (45);
6) or between the output terminal of the second comparison circuit (46) and the input terminal of the signal combination circuit (47), and is inserted between the input terminal of the second comparison circuit (46) and the input terminal of the signal combination circuit (47), and is inserted between the input terminal of From the comparison signal @X@＾+, the relative chromaticity signal @X@_N or the erroneous relative chromaticity comparison signal @X accompanying the reflected signal in the disordered image signal
The input end is connected to the output end of the second diffuse reflection signal removal circuit (72) for removing @_N^+ and the (j) signal combination circuit (47). (k) an input terminal is connected to an output terminal of the counting circuit (48); and (k) an input terminal is connected to an output terminal of the counting circuit (48). and a foreign object detection signal generation circuit (49) for generating a foreign object detection signal V when the counting result of the counting circuit (48) exceeds a predetermined value. (7) The luminance signal Y consists of three coefficients α, β, and γ whose sum is 1 and whose value is greater than or equal to 0 and less than or equal to 1, and the three primary color signals R and G.
, B, and expressed as αR+βG+γB, according to claim (6). (8) The signal combination circuit (47) outputs (a) the luminance comparison signal Y^+ and the relative chromaticity comparison signal @X@^
(b) Luminance comparison signal Y^+ and relative chromaticity comparison signal @X@^
(c) an OR circuit (47B) for outputting an OR signal Y^++@X@^+, and (c) an output terminal of an AND circuit (47A) and an OR circuit (47
B), the output terminal of the first comparator circuit (43), and the output terminal of the second comparator circuit (46) are connected to first to fourth switching contacts, respectively, and serve as output terminals. A common contact is connected to the input terminal of the counting circuit (48), and the logical product signal Y^+@X@^+, the logical sum signal Y^++@X@^+, the brightness comparison signal Y^+, and the relative color are output. and a changeover switch (47C) for selecting one of the degree comparison signals @
The article inspection device described in item 6) or item (7). (9) The input terminal of the first diffuse reflection signal removal circuit (71) is connected to the output terminal of (i) the luminance signal generation circuit (42) or the output terminal of the first comparison circuit (43). , a first delay circuit (71a) for delaying the luminance signal Y or the luminance comparison signal Y^+ by a time corresponding to one screen imaging time of the image signal, and (ii) the output of the luminance signal generation circuit (42). One input terminal is connected to the terminal or the output terminal of the first comparison circuit (43), the other input terminal is connected to the output terminal of the first delay circuit (71a), and the output terminal is connected to the output terminal of the first delay circuit (71a). It is connected to the input terminal of the comparison circuit (43) of No. 1 or the input terminal of the counting circuit (48), and the luminance signal Y or the luminance comparison signal Y^+ and the luminance signal delayed by the first delay circuit (71a). Erroneous luminance signal Y_N or erroneous luminance comparison signal Y_N^+ accompanying the diffuse reflection signal in the image signal is obtained from the luminance signal Y or luminance comparison signal Y^+ by calculating the AND between Y or luminance comparison signal Y^+. The input terminal is connected to the output terminal of the first AND circuit (i) division circuit (45) or the output terminal of the second comparison circuit (46) for removing the relative chromaticity signal. a second delay circuit (72a) for delaying the @X@ or relative chromaticity comparison signal @X@^+ by a time corresponding to one screen imaging time of the image signal; (ii) a division circuit (45); One input terminal is connected to the output terminal of or the output terminal of the second comparison circuit (46), and the other input terminal is connected to the output terminal of the second delay circuit (72a), and the output terminal is connected to the input terminal of the second comparison circuit (46) or the input terminal of the counting circuit (48), and the relative chromaticity signal @X@ or the relative chromaticity comparison signal X^+ and the second delay The logical product between the relative chromaticity signal @X@ or the relative chromaticity comparison signal @X@＾+ delayed by the circuit (72a) is calculated to generate the relative chromaticity signal @X@ or the relative chromaticity comparison signal @X. A second AND circuit (72b) for removing the erroneous relative chromaticity signal @X@_N or the erroneous relative chromaticity comparison signal @X@_N^+ accompanying the diffuse reflection signal in the image signal from @^+. Claim No. 6 (6)
) to (8). (10) Inspecting whether or not foreign matter is mixed in or attached to the inspected article by processing the image signal obtained by imaging the inspected article being conveyed by the article conveying section by the article imaging section. In the article inspection device, (a) a three primary color signal extraction circuit (141) for extracting and outputting three primary color signals R, G, and B from an image signal, and (b) an output terminal of the three primary color signal extraction circuit (141). The input terminal is connected to the three primary color signals R and G given from the three primary color signal extraction circuit (141).
, B to each other to create the three primary color sum signal X; (c) the output end of the three primary color signal extraction circuit (141) and the output end of the three primary color signal addition circuit (142) The input end is connected to the three primary color signals R given from the three primary color signal extraction circuit (141),
Two primary color relative chromaticities selected from three primary color relative chromaticity signals X_R, X_G, and X_B are obtained by dividing two selected from G and B by a three primary color sum signal Division circuits (144A_1, 144B_
1, 144C_1) and (d) division circuit (144A_1, 144B_1, 144
The input terminal is connected to the output terminal of C_1), and the three primary color relative chromaticity signals X_R, X_G, X_ given from the division circuit (144A_1, 144B_1, 144C_1)
(e) a relative chromaticity sum signal calculation circuit (146) for adding the relative chromaticity signals of two primary colors selected from B to each other in a desired ratio and outputting the resultant as a relative chromaticity sum signal @X@_Δ; The input terminal is connected to the output terminal of the relative chromaticity sum signal calculation circuit (146), and it determines whether the relative chromaticity sum signal @X@_Δ exceeds a set value and generates the relative chromaticity sum signal. a comparison circuit (147) for outputting a relative chromaticity sum comparison signal @X@Δ_＾+ which becomes a high level state only when @X@_Δ exceeds a set value; (f) a comparison circuit (147); The input end is connected to the output end of the chromaticity sum comparison signal (g) between the output terminal of the relative chromaticity sum signal calculation circuit (146) and the input terminal of the comparator circuit (147) or the comparator circuit (148);
47) and the input terminal of the counting circuit (148), it is inserted between the output terminal of the counting circuit (148) and the relative chromaticity sum signal @X@_Δ or the relative chromaticity sum comparison signal @X@_Δ^+ in the image signal. (h) a counting circuit (148); The input terminal is connected to the output terminal, and includes a foreign object detection signal generation circuit (149) for generating a foreign object detection signal V when the counting result of the counting circuit (148) exceeds a predetermined value. An article inspection device characterized by: (11) The diffuse reflection signal removal circuit (73) has an input terminal connected to the output terminal of the (i) relative chromaticity sum signal calculation circuit (146) or the output terminal of the comparison circuit (147), and the relative color Chromaticity sum signal @X@_Δ or relative chromaticity sum comparison signal @X
a delay circuit (73a) for delaying @_Δ^+ by a time corresponding to one screen imaging time of the image signal; and (ii) an output terminal of the relative chromaticity sum signal calculation circuit (146) or a comparison circuit (147). One input terminal is connected to the output terminal of the delay circuit (73a), and the other input terminal is connected to the output terminal of the delay circuit (73a), and the output terminal is the input terminal of the comparator circuit (147) or the counting circuit (148). It is connected to the input terminal of the relative chromaticity sum signal @X@_Δ or the relative chromaticity sum comparison signal @X@_Δ＾+ and the delay circuit (73
Relative chromaticity sum signal @X@_Δ or relative chromaticity sum comparison signal @X@_Δ delayed by a)
The relative chromaticity sum signal @X@_Δ is obtained by calculating the logical product between
Or, from the relative chromaticity sum comparison signal @X@_Δ＾+, the incorrect relative chromaticity sum signal @X@_Δ accompanying the diffuse reflection signal in the image signal
_N or incorrect relative chromaticity sum comparison signal @X@_Δ_N＾+
and an AND circuit (73b) for removing the
0) Article inspection device described in item 0). (12) Inspecting whether or not foreign matter is mixed in or attached to the inspected article by processing an image signal obtained by capturing an image of the inspected article being conveyed by the article conveying section using the article imaging section. In the article inspection device, (a) a three primary color signal extraction circuit (141) for extracting and outputting three primary color signals R, G, and B from an image signal, and (b) an output terminal of the three primary color signal extraction circuit (141). The input terminal is connected to the three primary color signals R and G given from the three primary color signal extraction circuit (141).
, B to each other to create the three primary color sum signal X; (c) the output end of the three primary color signal extraction circuit (141) and the output end of the three primary color signal addition circuit (142) The input end is connected to the three primary color signals R given from the three primary color signal extraction circuit (141),
By dividing one of the three primary color signals selected from G and B by the three primary color sum signal X given from the three primary color signal addition circuit (142), three primary color relative chromaticity signals X_R, X_G, X_B are generated.
A division circuit (144A_1, 144B_1, 144C
_1) and (d) division circuit (144A_1, 144B_1, 144
The input terminal is connected to the output terminal of C_1), and the relative color is determined by determining whether the relative chromaticity signal @X@ given from the division circuit (144A_1, 144B_1, 144C_1) exceeds the set value. Comparison circuit for outputting the relative chromaticity comparison signal @X@＾+ which becomes a high level state only when the chromaticity signal @X@ exceeds the set value (
147) and (e) the input terminal is connected to the output terminal of the comparison circuit (147), and the test target is detected by counting the high level state included in the relative chromaticity comparison signal @X@^+. a counting circuit (148) for counting the number of foreign substances mixed in or attached to the article; and (f) a division circuit (144A_1, 144B_1, 144
C_1) and the input end of the comparison circuit (147) or between the output end of the comparison circuit (147) and the input end of the counting circuit (148), and the relative chromaticity signal @X @ or relative chromaticity comparison signal @X
From @＾+ to incorrect relative chromaticity signal @X@_N or incorrect relative chromaticity comparison signal @X@_N accompanying the diffuse reflection signal in the image signal
The input terminal is connected to the output terminal of the diffuse reflection signal removal circuit (73) for removing ^+ and (g) the counting circuit (148), so that the counting result of the counting circuit (148) reaches a predetermined value. An article inspection device comprising: a foreign matter detection signal generation circuit (149) for generating a foreign matter detection signal V when the foreign matter detection signal V is exceeded. (13) The diffuse reflection signal removal circuit (73) (i) The division circuit (144A_1, 144B_1, 144
The input terminal is connected to the output terminal of C_1) or the output terminal of the comparison circuit (147), and the relative chromaticity signal @X@ or the relative chromaticity comparison signal @X@＾+ is used to capture one screen of image signals. (11) A division circuit (144A_1, 144B_1, 14
One input terminal is connected to the output terminal of the comparison circuit (4C_1) or the output terminal of the comparison circuit (147), the other input terminal is connected to the output terminal of the delay circuit (73a), and the output terminal is connected to the output terminal of the comparison circuit (147). 147) or the input terminal of the counting circuit (148), and is delayed by the relative chromaticity signal @X@ or the relative chromaticity comparison signal @X@^+ and the delay circuit (73a). Calculate the logical product between the relative chromaticity signal @X@ or the relative chromaticity comparison signal @X@＾+, and calculate the logical product in the image signal from the relative chromaticity signal @X@ or the relative chromaticity comparison signal @X@＾+. An AND circuit (7
Claim No. 3b)
2) Article inspection device described in section 2). (14) Inspecting whether or not foreign matter is mixed in or attached to the inspected article by processing an image signal obtained by capturing an image of the inspected article being conveyed by the article conveying section using the article imaging section. In the article inspection device, (a) a three primary color signal extraction circuit (141) for extracting and outputting three primary color signals R, G, and B from an image signal, and (b) an output terminal of the three primary color signal extraction circuit (141). The input terminal is connected to the three primary color signals R and G given from the three primary color signal extraction circuit (141).
, B to each other to create the three primary color sum signal The input end is connected to the three primary color signals R given from the three primary color signal extraction circuit (141),
Division circuits (144A_1, 144B_1, 144C_1) for calculating and outputting the three primary color relative chromaticity signals X_R, X_G, and X_B by dividing G and B by the three primary color sum signal X given from the three primary color signal addition circuit (142); ), and (d) division circuit (144A_1, 144B_1, 14
The input end is connected to the output end of 4C_1),
Three primary color relative chromaticity signals X_R, X_G, X_ given from the division circuit (144A_1, 144B_1, 144C_1)
A multiplication circuit (144A_2, 144B_2, 144C_2) for calculating and outputting coefficient-added three primary color relative chromaticity signals αX_R, βX_G, γX_B by multiplying B by desired coefficients α, β, and γ;
e) The input terminal is connected to the output terminal of the three primary color signal extraction circuit (141), and the three primary color signals R and G given from the three primary color signal extraction circuit (141)
, B are compared with each other to calculate and output selection signals g_R, g_G, and g_B which become 0 corresponding to the maximum one; (f) a multiplication circuit (144A_2, 144B_2, 144
The input terminal is connected to the output terminal of C_2) and the output terminal of the selection signal generation circuit (143), and the selection signals g_R, g_G, g_B given from the selection signal generation circuit (143) and the multiplication circuit (144A_
Relative chromaticity sum signal calculation for outputting a relative chromaticity sum signal @X@_Δ by adding together the products of the three primary color relative chromaticity signals αX_R, βX_G, γX_B with coefficients given from 2, 144B_2, 144C_2) The input terminal is connected to the output terminal of the circuit (146) and (g) relative chromaticity sum signal calculation circuit (146), and whether or not the relative chromaticity sum signal @X@_Δ exceeds the set value. a comparison circuit (147) for outputting a relative chromaticity sum comparison signal @X@_Δ^+ which becomes a high level state only when the relative chromaticity sum signal @X@_Δ exceeds a set value; (h) The input terminal is connected to the output terminal of the comparison circuit (147), and by counting the high level state included in the relative chromaticity sum comparison signal A counting circuit (148) for counting the number of attached foreign substances; and (i) between the output terminal of the relative chromaticity sum signal calculation circuit (146) and the input terminal of the comparator circuit (147) or the comparator circuit (148);
47) and the input terminal of the counting circuit (148), it is inserted between the output terminal of the counting circuit (148) and the relative chromaticity sum signal @X@_Δ or the relative chromaticity sum comparison signal @X@_Δ^+ in the image signal. a diffused reflection signal removal circuit (73) for removing the erroneous relative chromaticity sum signal @X@_Δ_N or the erroneous relative chromaticity sum signal @X@_Δ_N^+ accompanying the diffused reflection signal; and (j) a counting circuit (148). and a foreign object detection signal generation circuit (149) for generating a foreign object detection signal V when the counting result of the counting circuit (148) exceeds a predetermined value. An article inspection device characterized by: (15) The diffuse reflection signal removal circuit (73) has an input terminal connected to the output terminal of the (i) relative chromaticity sum signal calculation circuit (146) or the output terminal of the comparison circuit (147), and the relative color Chromaticity sum signal @X@_Δ or relative chromaticity sum comparison signal @X
a delay circuit (73a) for delaying @_Δ^+ by a time corresponding to one screen imaging time of the image signal; and (ii) an output terminal of the relative chromaticity sum signal calculation circuit (146) or a comparison circuit (147). One input terminal is connected to the output terminal of the delay circuit (73a), and the other input terminal is connected to the output terminal of the delay circuit (73a), and the output terminal is the input terminal of the comparator circuit (147) or the counting circuit (148). It is connected to the input terminal of the relative chromaticity sum signal @X@_Δ or the relative chromaticity sum comparison signal @X@_Δ＾+ and the delay circuit (73
Relative chromaticity sum signal @X@_Δ or relative chromaticity sum comparison signal X_Δ^+ delayed by a)
From the relative chromaticity sum signal @X@_Δ or the relative chromaticity sum comparison signal @X@_Δ＾+, calculate the logical product between the erroneous relative chromaticity sum signal @X due to the diffuse reflection signal in the image signal. @＿Δ＿N
or an AND circuit (73b) for removing the erroneous relative chromaticity sum comparison signal @X@_Δ_N^+.
4) Article inspection device described in section 4).