JPS6020131A - Color discriminating device - Google Patents

Abstract

PURPOSE:To detect a color with high accuracy by comparing wavelength distribution data of a stored speified color with measured data. CONSTITUTION:When a color filter plate 21 is rotated by a micromotor 22, each filter is switched successively in front of a lens of a CCTV camera 1, and the CCTV camera sends out a video information corresponding to each filter. This infomation is stored in a VRAM5, and this data and set data of a wavelength distribution of a specified color stored in an RAM6 are compared and calculated by a CPU8. In case when measured data is within an allowable range in which the set data exists, an output of ''OK'' is sent out through a PIO11, and its fact is displayed on a CRT keyboard 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color discrimination device that identifies the color of an object to be measured and determines its quality.

Conventionally, this type of color discrimination device is often implemented by a device that detects the amount of light reflection from a color camera or a photoswitch. However, if a color camera is used, it is expensive, and if a photoswitch is used, the output is very unstable because the color itself is not detected.

The present invention was devised in view of this situation, and it is an object of the present invention to provide a color discriminating device that is inexpensive and can provide stable output.

In order to achieve the above object, a color discrimination device according to the present invention includes a CCTV camera using a monochrome imaging device;
a color filter device disposed between the lens of the CCTV camera and the object to be measured, consisting of at least six types of color filters, which are sequentially switched;
Measured data storage means for storing the sensitivity distribution output corresponding to each filter of the CTV camera; Setting data storage means for storing in advance the sensitivity distribution for each band of each of the filters of a desired color; Output of the measured data storage means and a comparison means for comparing the output of the setting data storage means and determining whether the measured data is within the error range of the setting data.

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a block diagram of a color discrimination device according to an embodiment of the present invention. In the figure, a color filter device (2) is installed in front of a monochrome high-sensitivity image pickup tube camera (1). This color filter device (2) is composed of a filter plate Q1) and a micromotor that rotates it. The filter plate (c) is composed of about eight types of narrowband interference filters, and in the present invention, since it is necessary to quantitatively understand the ratio of at least three primary colors, at least six types of filters are used. Required. In this embodiment, as shown in FIG. 2, there are eight types of filters (Y1 to A8), which are distributed at equal angles on the filter disc. As shown in FIG. 6, each filter is one that exhibits narrow band characteristics with respect to the optical wavelength. In addition, around the color filter plate 0υ,
Holes (2) indicating the positions of each color filter (A1 to A8)
1a) is provided.

A light emitting diode 0υ and a phototransistor 02 are installed on both sides of the hole (21 &) of the color filter plate 01), and the output of the phototransistor Oa is connected to a position detection circuit (T).
A filter position detector (3) is configured by being connected to the filter position detector (3).

The output of the CCTV camera (1) and the output of the position detection circuit (to) are supplied to the interface (4), and video information corresponding to each filter is stored in the VRAM (5).

At this time, each filter has a hole (21) in the color filter plate.
The timing is determined based on the position and number of a) as shown in FIG. It's cool, the video information is VR
Digitization when stored in A M (5) is A/D converted (binary, 4-value, or 16-value conversion) for each filter, that is, for each screen, in the interface (4).

Then, in the RAM (6), use the CTR keyboard (7) to set the sensitivity ratio for the wavelength range corresponding to each filter, and also set the error detection value for the ratio. I'll keep it.

For example, set. 1. The program for this control system is stored in the ROM (8). And the CPU (9) has
APU (high-speed processing unit; 10), CTC (counter time circuit; 11) and PIO (parallel output input interface controller; 12) are added.

In the color discrimination device configured as described above, when the color filter plate Qυ is rotated by the micromotor), each filter (1 to 8) is connected to the CCTV camera (
The CCSV camera (
1) sends out video information corresponding to each filter. This information is stored in VRAM (5), and this data and R
The setting data stored in A M (6) and the CPU
A comparison operation is performed in (8). At this time, if the measured data is within a certain allowable range of the setting data, an "OK" output is sent out, and if it is outside the range, an "NG" output is sent to the outside via the PIOαη.

Of course, at this time, it is also displayed on the CRT keyboard (7).

In the above-described embodiments, a disc-shaped color filter is used as an example of the color filter device, but it may be of another type, such as a sliding type. Also, cc
Although an example is shown in which an image pickup tube is used for T, it goes without saying that a CCD may also be used.

In addition, by storing setting data for various colors in advance in the RAM (6) and sequentially comparing them with measurement data,
The color of the object to be measured may be determined.As is clear from the above description, the color discrimination device according to the present invention stores the wavelength distribution of a specific color in the setting data storage means, and stores the data. Since the color harmonics and the measurement data are measured, the degree of color harmony can be detected in a constant -4 manner, and highly accurate color detection can be performed. That's naive, because it uses CCTV with a monochrome imaging device instead of a color camera, so the entire device can be manufactured at a low cost.

Since the color discrimination device according to the present invention is capable of highly accurate color detection as described above, its application examples include the following.

(B) Detection of the quality of color harmony of automobile manufacturing and other paint colors (Checking the finish of Oj color printing (C) Automatic sorting of products by pasting colored paper on products) Color distribution in color image analysis System for determining and applying

[Brief explanation of drawings]

Fig. 1 is a block diagram of a color discrimination device according to an embodiment of the present invention, Fig. 2 is a front explanatory view of a color filter plate, Fig. 6 is a sensitivity characteristic diagram of each color filter, and Fig. 4 is a diagram of each color filter. and FIG. 6 is a timing explanatory diagram of position detection. (1)・・・CCTV camera, (2)・・・・・・
・Color filter device, (3)...Filter position detector, (4)...Interface, (5
)...vH4M, ((i)...RAM
, (7)...CRT keyboard, (8)...
...IζOM, (9) ...CPU, α...
...APU, (1η...CTCl (1
...PIO. Agent Patent Attorney Sanro Kimura Figure 1 Figure 2 Figure 3 Photographer's entry (mm)

Claims (1)

[Claims] A CCTV camera using a monochrome imaging device;
a color filter device disposed between a lens of a CTV camera and an object to be measured, consisting of at least six types of color filters, which are sequentially switched;
Measured data storage means for storing the sensitivity distribution output corresponding to each filter of the V camera; Setting data storage means for storing in advance the sensitivity distribution for each band of each of the filters of a desired color; Output of the measured data storage means and a comparison means for comparing the output of the setting data storage means and determining whether the measured data is within an error range of the setting data.