JPH03184188A - Image recognition device - Google Patents

Abstract

PURPOSE:To reduce storage capacity and securely decide the shape of an object in a short time by comparing image data on a selected scanning line with reference image data and deciding the shape. CONSTITUTION:A scanning means 3 scans the output of an image signal output means 1 and an image data output circuit 4 which is controlled by a control circuit 6 outputs image data on the object on the scanning line according to the brightness of the selected scanning line and stores it in an image data storage circuit 7. The storage contents are compared with the reference image data from a reference data storage circuit 8 and a decision circuit 9 decides the object shape. This constitution reduces the storage capacity and the object shape is securely decided in a short time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an image recognition device.

[Prior Art] Conventionally, image recognition devices have been used, for example, in factories to inspect whether parts have been correctly processed into a predetermined shape. In this method, a part, which is an object, is photographed with a camera, the entire area of the screen is scanned by a plurality of scanning lines, and image data for one frame is stored in a storage circuit. By comparing the image data for one frame stored in this storage circuit with reference image data stored in advance, it is determined whether the part has the correct shape or not.

[Problem to be solved] ``Two feet'' Conventional image recognition devices store all image data for one frame, so for example, when performing Gbit quantization on 512 x 512 pixels, 256K
A storage circuit with a large capacity of bits is required.

Further, even if the same screen is subjected to binarization processing, that is, 1-bit quantization, a storage circuit with a considerably large capacity of 32 Kbits is required. Moreover, in the case of binarization processing, it is difficult to correct slight changes in the amount of illumination light or changes in the angle of incidence, so erroneous recognition is likely to occur due to changes in the environment.

However, even if one frame's worth of image data is stored, it actually includes image data such as the background of the object, and the image data necessary to determine the shape of the object is That's just part of it. In other words, a considerable amount of useless image data is stored, and the image recognition operation also takes time.

An object of the present invention is to provide an image recognition device that can reliably determine the shape of an object in a short time.

[Means for Solving the Problems] The present invention includes an image signal output unit that outputs an image signal to be recognized, and a system that receives the image signal output by the image signal output unit and scans the screen using a plurality of scanning lines. an image data output circuit that outputs image data based on the brightness only in a preselected desired scanning line among the plurality of scanning lines; and image data output from the image data output circuit. By providing a determination circuit that compares the image data with pre-stored prefectural quasi-image data, determines the quality of the image data, and outputs the determination result,
This solves the above problem.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is an image signal output means such as a video camera that outputs an image signal to be recognized, and 2 is a CRT that displays an image based on the image signal from the image signal output means 1.
A display unit 3 receives an image signal from the image signal output means 1, scans the entire screen with a plurality of scanning lines, and outputs an image signal based on the brightness thereof; 4 a display unit 4 receives an image signal from the image signal output means 3; An image data output circuit outputs the image signal as image data only in a preselected scanning line of the image signal; 5 is a circuit for specifying a scanning line in which image data is to be stored among the scanning lines of the scanning means 3; This is a scanning line specifying means, and is specified by, for example, the right ben or keyta left on the display screen of the display unit 2. 6 is a control circuit that controls the image data output circuit 4 based on the scanning line number specified by the scanning line specifying means 5; 7 is an image data storage circuit that stores image data from the image data output circuit 4; Image data of a predetermined shape to be recognized is used as reference image data in advance; c! The stored reference data storage circuit 9 is a determination unit for determining whether or not the recognition target has a predetermined shape by comparing the image data in the image data storage circuit 7 and the reference image data in the reference data storage circuit 8. It is a circuit. The determination result by the determination circuit 9 is output to an external notification means or the like.

FIG. 2 shows the internal configuration of the image data output circuit 4 and the image data storage circuit 7. In the same figure, 1
0a to IOC are counters, and from the scanning means 3 to the terminal a
Counting is performed by a horizontal synchronizing signal supplied to the terminal, and is reset by a vertical synchronizing signal supplied from the scanning means 3 to the terminal. 11 is an A-D converter that converts the image signal supplied from the scanning means 3 to the terminal C into a digital signal, and 12a to 12c are gate circuits.

The image data output circuit 4 is constituted by the above 10a to 12c. Line memories 13a to 13c each store image data for one scanning line, and these constitute the image data storage circuit 7.

Next, the image recognition operation will be explained along the flowchart of FIG.

First, the image signal output means 1 photographs a recognition target. The image signal from the image signal output means 1 is output to the display section 2 and the scanning means 3. The display section 2 displays the image of the recognition target photographed by the image signal output means 1 on the screen based on the image signal. FIG. 3 shows the display screen of the display unit 2, and in this example, the recognition targets are diameters φ, φ2, and φ.
It is composed of three cylindrical parts. L-L3 is a scanning line for storing the image data specified by the scanning line specifying means 5, L is a cylindrical portion with a diameter of φ1, and L is a cylindrical portion with a diameter of φ1.
The cylindrical portion L3 is selected so as to scan the cylindrical portion 2 having a diameter φ3. Scanning line designation means 5
When a scanning line is designated by , the control circuit 6 clears the counters 10a to 10c, and then the number of the designated scanning line is written to the counter 10 as the counting end value.
a to 10c (step ■).

Next, when a recognition switch (not shown) is operated, the scanning means 3 receives the image signal output from the image signal output means 1, scans the front area of the screen with a plurality of scanning lines, and based on the brightness Outputs the image signal. FIG. 4 shows the respective image signal waveforms output from the scanning means 3 when scanning is performed using the scanning lines L, L, 2, and L3. In the same figure, (all
(b) is the case when the scanning line L2 is scanned, and (c) is the case when the scanning line L3 is scanned. The scanning means 3 outputs to the image data output circuit 4 a horizontal synchronization signal and a vertical synchronization signal for scanning the screen together with the above-mentioned image signal. Counters 10a to 10c count horizontal synchronizing signals from scanning means 3.

An image signal for each scanning line is supplied to the terminal C from the scanning means 3, converted into a digital signal by the AD converter 11, and supplied to the gate circuits 12a to 12c. The horizontal synchronizing signal from the scanning means 3 is sent from the terminal a to the counter 10a~
10c, and the counter 10a is supplied with L
When counting t, that is, when scanning the scanning line L1, an end signal is output. Similarly, the counter 10b outputs an end signal when scanning the scanning line L2, and the counter 10c outputs an end signal when scanning the scanning line L3. With this end value, the corresponding gate circuit is opened, and the line memories 13a to 1
Image data is stored in 3c (step ■).

In this way, the image data on the scanning line L1 is stored in the line memory 13a, the image data on the scanning line L2 is stored in the line memory 11b1, and the image data on the scanning line L3 is stored in the line memory 13c.

The image data stored in the image data storage circuit 7 is compared with reference image data previously stored in the reference data storage circuit 8 in a determination circuit 9, and the quality of the image data is determined. This determination result is output to an external notification means or the like. For example, if it is determined that the recognition target does not have a predetermined shape, a buzzer sounds 1!1.

With the above operations, only the image data on the pre-selected desired scanning line on the screen where the recognition target was photographed is used.
It is determined whether the recognition target has a predetermined shape.

In the above embodiment, three scanning lines are selected, but the present invention is not limited to this, and any number of scanning lines may be selected. In this case, the number of counters and gate circuits of the image data output circuit 4 and line memories of the image data storage circuit 7 will also be changed.

[Effects] According to the present invention, since it is necessary to store only the image data on the selected scanning line, the storage capacity of the storage circuit can be significantly reduced. Therefore, even if multi-valued data is used, the storage capacity will not be so large and shape recognition can be performed more reliably, which is preferable. Therefore, the shape of the object can be reliably determined in a short time? 11 can be determined.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an electric circuit diagram showing the internal configuration of the main parts of Fig. 1, and Figs. 3 and 4 explain the operation of Fig. 1. FIG. 5 is a flowchart for explaining the operation of FIG. 1. 1... Image signal output means 3... Scanning means 4... Image data output circuit 9... Judgment circuit and above

Claims (1)

[Scope of Claims] Image signal output means for outputting an image signal to be recognized; scanning means for receiving the image signal outputted by the image signal output means and scanning the screen with a plurality of scanning lines; an image data output circuit that outputs image data based on the luminance only in a desired scanning line selected in advance from among the scanning lines; and image data from the image data output circuit and a pre-stored standard. An image recognition device comprising: a determination circuit that compares the image data with image data, determines whether the image data is good or bad, and outputs the determination result.