JPS593330A - Color discrimination device - Google Patents

Abstract

PURPOSE:To facilitate setting operation, by comparing the spectral pattern data obtained by spectrally analyzing the object to be discriminated with those of plural reference colors memorized in advance and judging one of the reference colors as its color when amts. of deviations between both data do not exceed a certain value. CONSTITUTION:A reference light P illuminates the object X to be discriminated with an illumination means 2 in a color analyzing section 1, and a spectral analyzing means 3 separates the reflected light Q into the 3 primary colors to detect each primary light level. Each color level is divided by the total of each level, and the spectral pattern data obtd. by standardizing each primary color level are formed with a standardizing means 4. These spectral pattern data of the object X provided from the station 1 are compared with those of the plural reference colors stored in advance, and when amts. of deviations between both do not exceed a predetermined value, this reference color is judged as the discriminated color of the object X with a discrimination means 6, and this discriminated reference color is indicated with a display means 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color identification device used for sorting conveyed items on a conveyor line, etc., and its purpose is to be able to identify any plurality of colors, and to To provide a color identification device that does not require troublesome adjustment.

Conventionally, this type of color identification device has two types: a preset type, in which the gain or threshold value of the circuit is adjusted automatically using polyurethane according to the color to be identified; There was a fixed type that could only be identified by a color, but the adjustment of the Prise/Site type was difficult and troublesome, and the fixed type had a fixed identification color, so it was not versatile and could easily be used. There has been a problem in that malfunctions may occur due to the influence of ambient light such as ambient light. The present invention has been made in view of the above points.Examples will be described below with reference to the drawings. FIG. 1 is a diagram showing a block configuration of an embodiment of the present invention, in which (1) is a color analysis section, and this color analysis section +1) is an illumination means for irradiating reference light (P) onto an object to be identified. (2), a spectroscopic analysis means (3) that separates the reflected light (Q) from the object to be identified (3) into eight primary colors and detects the level of each primary color, and each primary color output from the spectroscopic analysis means (3). It consists of a spectral pattern 'JT' which normalizes each primary color level by dividing the level by the sum of the primary color levels. (6) is the standard color read from the object to be identified (the spectral pattern data of the pattern puller memo January 5) output from the color analysis section f1). identification means (7) for comparing the standard color with the spectral pattern data and determining the standard color as the identification color when the deviation between both data is less than a preset value;
) is a display means for displaying the identified standard color. (8
) is a chopper means that pulses the reference light ('P) irradiated from the illumination means (2);
) is a disturbance removal means that sets the level of each primary color output from the reference light (F5) to a level obtained by subtracting the level when the reference light (P) is not irradiated from the level when the reference light (P) is not irradiated.

FIG. 2 to FIG. 4 are diagrams showing a specific configuration, in which the illumination means f11 and the chopper means (8) include a light source (10) such as an incandescent lamp or a discharge lamp, and a visible wavelength emitted from the light source (10). Condenser lens 2 that condenses light including the area
(11+ and aperture 02), and a chopper disk (11+ and aperture 02) that is rotationally driven by the 7-ta θ and cuts off the light that passes through the aperture (12).
14), and a remeter lens (11) that forms a substantially parallel reference beam (P) with the same light beam.
A reference light (Pi) such as a pulsed light interrupted by a chopper disk 04) is irradiated onto the object to be identified. In this case,
Irradiation time width (tp) of reference light (P) is chopper disk 04
) Cutout windows (15R) (15G) (1
5B) is proportional to the width (Wp). In addition, each cutout window (15
R) (15G) (15B) are provided so as to divide the circumference of the Chiyo-Shiba disk θ4) into eight, so the pulse period (Tp) is approximately constant.

Next, the spectroscopic analysis means (3) collects the reflected light from the object to be identified 00 (condensing lens 07 that condenses Q) and the filter (18RX 18
G) (18B), an aperture θ9), a photodetector (211) such as a photodiode, an amplifier (2), and a ~Φ converter (22).
The spectral transmittance characteristics of RX 18G) (18B) are as shown in Figure 5. )
(18G) (18B) are respectively cutout windows (15R) (1
5G815B) (a position symmetrical with respect to the center of the chopper disk θ4), and the reflected light (
0 enters the photodetector through each filter (18R018G) (18B), and the reflected light (Q
Each primary color level is sequentially detected. Here, filter (
18R) (186X18B) diameter (Wf) Fi cutout window (
15R) (15G) (15B) so that the aperture is made larger than the width (Wp) of ! (12) → Notch window (15RX
15G) (15B) → Object to be identified (3) → Filter (
18R) (18G) (18B) - Reference light (reflected light (Q) at the time of irradiation of pulsed light is made of pulsed light through the aperture 0η, and before and after that, disturbance light such as ambient illumination light (reflected light of 0' ( Q' is made incident. Figure 6 is a diagram showing the above operation, and (Tc) is the time (one period) for one rotation of the chopper disk 04). Both lenses used in the system (Oal 0?) should be achromatic (achromatic) lenses to ensure stable color identification even if the distance between the optical system and the object to be identified (3) changes. The primary color level signals (Vc) sequentially output from the photodetector (20) are amplified by the amplifier (21), converted to digital data by the A/D converter (2 in 5!), and subjected to spectroscopic analysis. This data is outputted from means (3).This data is taken in as primary color level data to a microcomputer consisting of a central processing unit (241), a monitor system (241) consisting of ROM, and a data memory such as RAM. This micro'']:/ Inside the computer are a disturbance removal means (9), a standardization means (4), and an identification means (6).
This is the arithmetic processing unit that realizes this. In addition, display means (
7) is a latch circuit (271) that checks 5 identification data (Dll) output from the microcomputer (to);
It is composed of a data circuit (4) and a multicolor LED display, and the LED corresponding to the identified standard color is turned on to notify the identification color. It goes without saying that the sorting process may be automated by directly controlling various control devices in the process based on the identification data (Do).

The specific operation of the arithmetic processing unit such as the microcomputer (23) of the embodiment will be described in detail below. The width is amplified to an appropriate level by the ~Φ cosiverter (two groups) and converted into digital data in synchronization with the Sanzu link clock (Ps) output from the central processing unit (24), and each primary color R, G, H The primary color level data (DR), (Do), and (DB) corresponding to the data are sequentially input into the central processing unit 4). Here, each primary color level data (DB), (DG), (DB) K is reflected light (Q
Each primary color level (RN) of y.

Primary color level data corresponding to (GN) and (BN) (
DRN).

(DGN), (DBN), and the reflected light (Q) by the reference light (T'l) (Rs), (Gs), (B
Primary color level data (DB8) corresponding to s), (D
os), (Dgs), central processing unit (24
) then subtract the former from the latter to get D'R= DB8- D
RN, D'a = Dos -DGN, D'B2Dos -DBN, and this gator (D'R), (
By setting DG, (DB) as each primary color level data used for subsequent calculations, the influence of disturbance light (P)' is removed.In other words, each primary color level of reflected light (Q) is By subtracting the level when the reference light (P) is not irradiated from the level when the reference light (P) is irradiated, the influence of the disturbance light (P)' can be offset and malfunctions caused by the disturbance light (Pr) can be prevented. This is what we are trying to do.

In addition, in the case where the disturbance light (Py) changes over time like in a fluorescent lamp, the primary color level signal (Vc) output from the photodetector (20) changes from the disturbance light (Py) as shown in FIG. P)
′ changes over time. At this time KVi
, disturbance light < reflected light due to py (primary color level (RN
.

) (RNe) have different values, so the arithmetic mean of these primary color levels (RNI) (RNt) is calculated as the primary color level (Rs
) to remove the influence of the disturbance light (PX). Therefore, the disturbance light (F
Primary color level data (DnQ x DR'DRN, + DBN2 = DBS-2, with the influence of 9' removed. However, (DRN, ).

(DBN2) is digital data corresponding to the primary color level (RNI) (RN,). It goes without saying that similar calculations are also performed for the primary color level data (Da')+(IJB').

Primary color level data (DR') obtained as described above
, (Da, (DB') are the sum of primary color level data (Da' + Da' + D
B') and normalized.

However, r+g+b=1. In this way, the spectral pattern data Dx (r
.

! :J, b) is the standard color spectral pattern data Ds(rn+
ITnt bn ). This pattern demon seven (5) uses a part of the game meter consisting of RAM, but in order to prevent data from being lost even when the device is powered off, it is necessary to install a backup battery or the like. Or non-volatile RAM (e.g. E
It is preferable to use EPROM'. On the other hand, the standard color spectral pattern data 51 Ds' (rn + gn l bn
) is data obtained by spectrally analyzing and standardizing an object of the color to be identified, that is, a standard color, under the same conditions as in actual use (same illumination, same arrangement), and is obtained by standardizing the spectroscopic analysis means f3 described above.
J, color analysis section (1) consisting of standardization means (4), etc.
) is the output data itself. Therefore, the standard color spectrum 1 ~ turnputer Ds (rn, gn,
bn) to the putter: J data meter (5), an object of a standard color is placed at a predetermined position as an object to be identified (3), and the data output from the color analysis section (1) is written to the standard color. Color spectral pattern data Ds (rn, gn, bn)
All you have to do is write it to the specified location in the pattern data file (January 6).

Note that the write operation section is a common one, so a description thereof will be omitted.

Next, to explain the color identification operation, first, the identification operation starts when a start signal (ST) from the outside enters the central processing unit (24).
t~ri03 to drive the chopper disk (14) from 24)
) control signal (MC) is output, and Tanabata 031 consisting of Stella Hinge Tanabata is 1 in synchronization with the control signal (MC).
Rotate. Primary color level data (DR
), (DG), (DB) are sequentially processed by the central processing unit (
24) and undergoes the predetermined data processing as described above to obtain spectral pattern data Dx(r, g, b
) is obtained. The start signal (ST) is a signal that sets the time point for measurement, and is, for example, an output signal of a photoelectric switch that operates when the object to be identified (3) comes to a predetermined position. In addition, the - evening 04 start signal (S
T) Rotate K multiple times to create multiple sets of primary colors, including bell data (DR), (Do), (DB).
) may be averaged to improve the accuracy of spectroscopic analysis.

By the way, the spectral pattern data Dx of the object to be identified (X)
(r + 'I*')) and the standard color spectral pattern data D read out from the pattern damono seven (5)
The deviation (e) from s (rnl cgnt bn) is r
, g, and b as the respective orthogonal axes, and are calculated as the mutual distances in the middle of eight dimensions as shown in the following equation.

However, n: 1.2.8,... The deviation (e) obtained by the above formula is set by the error setting signal (ER) input from the outside to the central processing unit (24). The standard color that satisfies e<e among the plurality of standard colors is determined as the identification color, and identification data (Do) corresponding to the number of the standard color is output, and the latch Q force is The identification color is displayed by lighting up the LED corresponding to the standard color in the display (29) via the decoder (2 barrels). e<e
, does not hold true for any standard color, it is determined that the color of the object to be identified (3) is not any standard color, and the LED of the display device (291) displays an unidentifiable indication. This is a physical representation of the operation, and the 1-spectral pattern data Dx (r r !J + b) and Ds (rn
1gn, bn) ld is standardized, so it is always located in a space surrounded by the plane of each coordinate axis and the plane of r + g + b = 1, and the volume error (eo) is the spectral value of the standard color. Pattern data D8 (rn l gn + bn
), and the spectral pattern data Dx(r + g, b
) is located, the color of the flash of the object to be identified is determined to be its standard color.

Although the above embodiment is a color identification device for sorting on a conveyor line, the color identification device according to the present invention can also be applied to a fruit ripeness determination device, a color difference detection device, and the like.

As described above, the present invention compares the spectral pattern data of the object to be identified spectrally analyzed by the color analysis section with the spectral pattern data of a plurality of standard colors stored in advance in the pattern data memory, and If the deviation is less than a preset value, the standard color is determined as the identification color, and any number of colors can be identified.
By storing the standard color spectral pattern data in the pattern data, it is now possible to set the color you want to identify. Since there is no need to make adjustments, it has the advantage of making it easier to set the color you want to identify.In addition, the level of the primary color output from the spectroscopic analysis means can be adjusted by the chiyo-v, pa means, and disturbance removal means when the reference light is irradiated. By subtracting the level when the reference light is not irradiated from the level of , the influence of ambient light is canceled out, so there is an advantage that malfunctions due to ambient light will not occur.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram of an embodiment of the present invention, FIG. 2 is a diagram showing a specific configuration of the same, FIGS. 8 and 4 are diagrams showing the main part configuration of the same, and FIGS. The figure is an explanatory diagram of the same operation as above. +l) is a color analysis section, (2) is an illumination means, (3) is a spectroscopic analysis section, (4) is a standardization means, (5) is a pattern data meter, (6) is an identification means, (8) is a chopper means, (9
) is a disturbance removal means. Agent Patent Attorney Ishi 1) Choshichi

Claims (2)

[Claims] (1) Illumination means for irradiating reference light onto an object to be identified;
Spectroscopic analysis means that separates the reflected light from the object to be identified into eight primary colors and detects the level of each primary color, and standardizes each primary color level by dividing each primary color level output from the spectroscopic analysis means by the sum of the primary color levels. A color analysis section is configured with a standardization means for forming spectral pattern data of standard colors, and a pattern data memory is provided for storing a plurality of spectral pattern data of standard colors. An identification means is provided which compares the pattern data with the spectral pattern data of the standard color read from the pattern demonstrator and determines the standard color as the identification color if the deviation between the two putters is less than a preset value. A color identification device consisting of (2) A chopper means is provided that converts the reference light irradiated from the illumination means into pulsed light, and the level of each primary color output from the spectroscopic analysis means is adjusted from the level when the reference light is irradiated to the level when the reference light is not irradiated. Claim 1, characterized in that it comprises a disturbance removing means that produces a subtracted level.
Color identification device as described in section.