JPS5953980A - Color pattern recognizing method - Google Patents

Abstract

PURPOSE:To discriminate information of an area to be detected, from an integral value, and to execute exactly the recognition, by deriving a ratio of a tri- color separation video signal of each point of a picture which is subjected to image pickup, and the sum of three signals, deriving a color of its point from this ratio, and integrating each color. CONSTITUTION:An area to be detected of an article is subjected to image pickup by an industrial color TV3, and each color separation video signal of R, G and B of a picture which is subjected to image pickup is digitized by an A/D converter 5 of an operating circuit. A ratio of said each video signal of R, G and B, and the sum of the three signals is derived by a normalizing circuit 6, and normalized values RR, RG and RB are added to a comparator 7. They are compared with standard patterns BRa, RGa and RBa from a color pattern memory 8, by this comparator 7, and when they are below a set value DR of an allowable value setting device 9, a color C of a picture element is outputted. Subsequently, the color C of all pictures is integrated by an integrator 10, an integral value SI is added to a comparator 11, is compared with contents from a standard pattern memory 12, and in accordance with whether it is below a value DN of an allowable value setting device 13 or not, a prescribed pattern is decided.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recognizing and classifying color-preserved objects such as color labels, color patterns of textiles, and painted colors.

Conventionally, in order to identify objects that form such complex color patterns, multiple methods such as pattern matching have been used.
．． A recognition method that handles # data has been adopted.

An object of the present invention is to provide a method for easily performing pattern recognition 2 using three primary color signals of an object.

FIG. 1 illustrates the principle of the present invention. Figure 1 (+
), there is a detection area 2 on the surface of the article 1 having information +1 to be identified. An image of the detection area is taken using an industrial color television camera 3. The video signal obtained from an industrial color television camera is composed of three primary color signals: red, green, and blue. Both sides are composed of scanning lines as shown in FIG. 1(2), and each scanning line is composed of picture elements having colors determined by the light, green, and blue.

The arithmetic circuit 4 performs the processing for each picture element over the entire screen as follows.

Color-separated video signal for each picture element JR (red), IG (green), I
The following calculation is performed on B (evening) to normalize it.

RR-IR/T...+1)RG-IG/
T...(2)RB-IB/T
...(3) T-IR+IG+IB ...(
4) Based on the RR, RG, and RB obtained in this way, we need to decide what color the picture element corresponds to.
(1) Standard pattern RRa(I), RG a(I)
, RBa(1), and if the following conditions are satisfied, the color is considered to belong to the color C(1).

IRR-RRa(1<DR-(51 1RG-RGa(Ii<DR...16)IRB-RBa
(I) I<DR-+71 If the above condition is not satisfied, it is assumed that the color does not belong to the color, and a comparison with the next color standard pattern is performed. The color C(I) determined in this way is integrated over the entire screen.

S (1) −/ C (I) ... (8
)1 − I+ 2.3. ..., N ... (9)
The color integral value 5(I) (5(1),
5(2),..., 5(N)) with the standard pattern 5a(1,J) of the identification target in order to determine what kind of recognition target the target belongs to. . Here, I represents the type of color and J represents the butter/type.

For example, 5a (1, 1,) represents the brown integral value of pattern 1. The comparison is based on whether the deviation between S (I) and 5a (I, J) is within the allowable deviation DN or not.
Determine the pattern.

FIG. 2 shows an embodiment of the ↑78 circuit 4 according to the present invention. Analog color component Wj video signal of each picture element obtained from an industrial color television camera +< (red), G (green).

B (evening) is converted into a digital value by an analog/digital converter 5 and outputs IR, IG, and IB, respectively.

The normalization circuit 6 divides IR, IG, and IB by their respective sums and outputs normalized values RR, RG, and RB. The comparator 7 compares RR, RG, RB and the content RR of the color pattern memory 8.
A comparison is made to see if the deviation from a(1), RG a(1), and Rr3 a(I) is less than or equal to DR, and the color c(i) of the picture element is determined. Comparison tolerance value I)R is setter 9
It is determined by The integrator 10trL integrates the color C(I) over the gold mine 111j, and outputs the integral value S(I). The comparator 11 compares S(1) with the content S(I, J) of the standard pattern memory 12, and determines the pattern to which it belongs based on whether the deviation is less than or equal to DN. The synchronization signal separation circuit 14 generates a vertical synchronization signal from the output signal of the industrial color television camera and inputs it to the normalization circuit 6, comparator 7, and integrator 10, respectively, and instructs the first and last timing of image input. give.

According to the present invention, even objects with complex patterns can be easily identified, and the more types of colors used for determination, the more accurate the recognition.

As described above, according to the present invention, pattern recognition can be easily performed.

[Brief explanation of the drawing]

1 is a diagram showing the principle of the present invention, and FIG. 2 is a block diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Article, 2... Detection area, 3... Industrial color television camera, 4... Arithmetic circuit, 5... Analog/digital converter, 6... Normalization circuit, 7 ...Comparator, 8...Color pattern memory, 9...Tolerance value setter, 10...Integrator, 11...Comparator, 12...
・Standard pattern memory, 13・Tolerance value setter, 14...
・Synchronous Separation Circuit Agent Patent Attorney Kei Nishi Department Figure 1 (2)

Claims (1)

[Claims] [Color] 7 The gray-colored detection area is photographed by a color imaging means, and at each point on the imaged screen, color-separated video signals of red, green, and 4 colors and the red, green, and r r Find the ratio of the sum of the three signals, find the color of that point by nucleation, integrate each color over the entire screen, and identify the information of the detection area from the integrated value. Color pattern recognition method.