JPS5953979A - Color pattern recognizing method - Google Patents

Abstract

PURPOSE:To discriminate informtion of an area to be detected, and to recognize easily a pattern, by integrating a color separation video tricolor signal of a picture which is subjected to image pickup by a color image pickup means every each color, and deriving a ratio of each integral value and the sum total of integral values of the three colors, respectively. CONSTITUTION:An area to be detected of an article is subjected to image pickup by an industrial color TV3, is inputted to a pattern recognizing circuit 4, and analog color separation video signals R, G and B are digitized by an A/D converter 5. Each of said IR, IG and IB is integrated by an integrator 6, integral values SR, SG and SB are added to a normalizing circuit 7, each of them is divided by its sum, normlized outputs RR, RG and RB are provided to a comparing and deciding device 8. The normalied outputs RR, RG and RB are compared with a value of a standard pattern memory 9 by this deciding device 8, and in case when its difference is smaller than an output DR of an allowable value setting device 10, a belonging pattern name SO is outputted. In this way, information of an area to be detected is discriminated, and its discrimination is executed easily.

Description

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

Conventionally, in order to identify objects that form such complex color patterns, recognition methods such as pattern matching, which are complex and require a large amount of data, have been employed.

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

FIG. 1 is a diagram showing the principle of the present invention. Figure 1 (1)
, there is a detection area 2 on the surface of the article 1 having information to be identified. The detection area is imaged using an industrial color television camera 3, and its output is input to an arithmetic circuit 4. The screen is made up of scanning lines as shown in FIG. 1(2), and each scanning line is made up of picture elements having colors determined by the red, green, and blue colors. The arithmetic circuit 4 receives color-separated video three primary color signals IR of red, green, and blue for each picture element obtained from the industrial color television camera 3.

The following processing is performed using IG and IB. First, the color separated video signals IR, IG, 'IB are integrated over the entire surface, and SR-/IR...[1] SG-/IG...(2) SB-/I
B ... Find (3), SR, SG,
The following calculation is performed on SB to normalize it.

RR-8R/T... (4) RG-, SG
/T...(5)RB-SB/T
...(6)T-5R+SG+SB
...(7) Standard color patterns RRa(1), RGa(1), RB given in advance for each object requiring identification are applied to the RR, RG, and RB thus identified.
Find each difference in a(1), and the value is the allowable deviation DR
When it is smaller, it is determined that the object belongs to the pattern.

Here ■ represents the type of pattern. That is, IRR-
RRa(I) l < DR・tg+IRG−RGa(
I)l<DR・1911RB−RBa(I)l<DR・
- When (10) holds, the object is assumed to belong to the object given as a standard pattern; if it does not hold, it is assumed that the pattern does not apply, and the object is compared with the next standard pattern.

FIG. 2 shows a specific configuration of the arithmetic circuit 4. As shown in FIG.

Analog color separation video signal R from industrial television camera 3
(red), G (green), and B (blue) are converted into digital values by analog/digital converter 5, and IR and IG are respectively converted into digital values.
, outputs IB. The integrator 6 integrates R, IG, and IB, respectively, to obtain an integral value SR.

Outputs SG and SB. The normalization circuit 7 is SR.

SG and SB are each divided by the sum and normalized, and normalized outputs RR, RG, and RB are output. The comparison circuit 8 compares the normalized values RR, RG, RB with the values in the standard pattern memory 9. It is compared whether the difference is smaller than the output DR of the tolerance value setter 10, and if it is smaller, the belonging pattern name S (outputs 1. Synchronous signal separation circuit) 1
separates the vertical synchronization signal from the output signal from an industrial television camera, and uses an integrator 6, a normalization circuit 7 and a comparison circuit 8.
and give instructions for the start and end timing of image input.

As described above, according to the present invention, it is possible to perform V recognition easily.

[Brief explanation of drawings]

FIG. 1 is a principle diagram 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... Pattern recognition circuit, 5...
Analog/digital converter, 6... Integrator, 7...
Normalization circuit, 8... Comparison/judgment device, 9... Standard pattern memory, IO... Tolerance value setting device Agent Patent attorney Kei Nishi Department Figure 1 (2)

Claims (1)

[Claims] A color-maintained detection area is imaged by a color imaging means, and the three primary color signals of red, green, and blue color separation are integrated over the imaged screen for each of red, green, and blue, and the respective integral values are By finding the ratio of the three integral values of red, green, and blue,
A color pattern recognition method characterized by identifying information on a detection area.