JPH0783856A - Method for detecting and processing - Google Patents

Abstract

PURPOSE:To perform automatic inspection at low cost and at high speeds without using auxiliary control equipment in order to determine whether or not a subject for inspection is defective through image processing. CONSTITUTION:In order to subject an image signal to real-time arithmetic processing by an image processing portion 3 to subject an image to simple binarization for image processing, a subject 1 for inspection is moved relative to a camera 2, and a trigger signal is inputted in synchronization with the termination of the image processing and then processed; i.e., at the input of one trigger signal, image fields are processed and measured the designated number of times in synchronization with images, and an output of synthetic judgment on the overall subject for measurement is produced at the finish of measurement of the final field, so as to perform arithmetic processing as image processing with ease and high efficiency without using auxiliary control equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the inspection of cylindrical objects such as bottles and continuous objects, and the appearance of other inspection objects.
The present invention relates to a defective product detection processing method for capturing an image with a camera such as a D camera and processing the image signal to determine the quality of an inspection target.

[0002]

2. Description of the Related Art Conventionally, in automatic inspection using image processing using a camera, in addition to product label inspection, inspection of different types of products, partial damage due to product loss, shape abnormality, scratches, dirt or foreign matter adhesion It is carried out for the purpose of removing quality defective products from the production line to improve quality control, but in order to inspect continuous objects and cylindrical objects such as bottles with an automatic inspection device that uses image processing, A method is known in which a trigger signal (measurement start signal) is input each time one image field processing is completed after the object enters the field of view of the camera, and each judgment result is comprehensively judged by the control device etc. and output as one judgment result. Has been.

[0003]

Generally, it is required in quality control that the production line is not delayed, the judgment range is widened, and the inspection accuracy and speed are higher. Since it is a visual inspection of the inspection object, inspection of continuous objects and bottles is performed as shown in FIG.
In order to detect the sample a, it is necessary to once perform processing through the control device b or the like.
Since the trigger signal is also input to the control device b, the processing time of the control device b is added before the determination, the cost is high, and the trigger signal synchronized with each image field is externally supplied. It is not easy to input more, and it takes a processing time, and the higher the accuracy, the more it tends to occur, which is a problem. The present invention is intended to eliminate these conventional drawbacks, and performs image processing by simple binarization, and the image processing operation processing is simple and highly efficient without the use of auxiliary equipment. Therefore, it is another object of the present invention to provide a defective product inspection processing method that can make judgments at extremely low cost at high speed and can easily prevent judgment errors.

[0004]

The present invention takes in image data from a camera for inputting an image of an inspection object,
The image processing unit, which is recorded in the memory, performs real-time arithmetic processing on the image signal and simply binarizes the image for image processing. The inspection target is moved relative to the camera and synchronized with the end of image processing. Then, when the trigger signal is input and processed, the processing measurement of the image field of the specified number of times is performed in synchronization with the image synchronization by the input of the trigger signal once, and at the end of the final field measurement, the total inspection object is comprehensively measured. It is a defective product detection processing method characterized by causing a determination output.

[0005]

The object to be inspected, for example, the image data obtained by capturing the image data of the label-attached bottle with the camera and recording it in the memory is subjected to real-time arithmetic processing on the image signal, and the image is simply binarized for image processing. In addition, the inspection object is moved relative to the camera, and in synchronization with the end of the image processing, a trigger signal is input to the automatic inspection device for processing. Then, by inputting a single trigger signal to the automatic inspection device, the processing measurement of the image field for the specified number of times is performed in synchronization with the image synchronization, and at the end of the final field measurement, a comprehensive judgment output of the entire inspection object is output and incidental equipment. It is possible to perform high-speed and practical automatic inspection without using.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment of the present invention will be described with reference to the examples of FIGS. 1 and 2. In the example of the product inspection of an inspection object, for example, the label-attached bottle 1, the product is captured by the CCD camera 2 as an image, The image signal is converted into a binary image by the image processing unit 3, that is, by the look-up tables 15 and 16, and the binary image is stored in the counters 17 and 18,
Microprocessor 1 through control bus 13
Real-time arithmetic processing is performed by 4, and the image is simple 2
When the trigger signal is input to the automatic inspection device 4 as well as the image processing by digitizing, the bottle 1 is relatively moved with respect to the camera 2, synchronized with the end of the image processing, and synchronized with the end of the image processing. Then, the trigger signal is input and processed, and in the automatic inspection device 4, the processing measurement of the image field of the specified number of times is performed in synchronization with the image by the input of the trigger signal once, and the inspection is performed at the end of the final field measurement. The overall judgment output for the entire object is performed, and the quality of the bottle 1 is detected.

In this case, the image processing unit 3 is provided with a real-time arithmetic processing unit, and lookup tables 15 and 16 in which specimens are individually set and a plurality of window storage units 5 and 6 having judgment criteria are used for the same screen. The above inspection may be performed, and since the shutter camera can be used, the inspection work can be performed without stopping.

That is, the cameras 2 and 2 controlled by the camera control 8 with the synchronization generated by the synchronization generator 9.
The analog video input from the A / D converters 10, 11
Is converted into a digital multi-valued image by using the look-up tables 15 and 16, and a multi-valued image having an arbitrary gradation is converted into a binary image, which is operated by the setting operation unit 12 in the window storage units 5 and 6 and stored arbitrarily. The area value in the shape window is measured and stored in the counters 17 and 18. This measured counter data is set in advance by the microprocessor 14 through the control bus 13 to the setting operation unit 4
Is operated and compared with the judgment value set or automatically set. Further, the images processed by the lookup table 15 are simultaneously measured in the window storage unit 5 and the window storage unit 6,
Microprocessor 1 through control bus 13
4, the calculated value is compared with a determination value which is set by operating the setting operation unit 12 in advance or is automatically set. The images of each processing stage are arbitrarily selected and displayed on the monitor 8 via the freeze image memories 21 and 22 and the multi-valued image memory 23, and the setting data can be quickly changed by the RAM card 19 and the host computer 20 by RS-232C. The data communication of is also available.

Further, the automatic inspection apparatus 4 is capable of data communication with a personal computer through the data setting operation unit 12, has a function of correcting the position of the inspection object, and has a free shape in addition to the rectangular window. Pattern can be set, and the pattern or window can be diffused, shrunk, and inverted, and the RAM card insertion section 24 is provided, so that the setting data can be stored and played back, and pattern change can be performed quickly. Image processing unit 3 including parts
May be configured.

Further, the image processing unit 3 is provided with
It is also considered that the monitor TV 7 is connected to the monitor TV 7 through the monitor cable to be useful for the visual inspection system, and the automatic inspection device 4 may perform the image processing and the processing measurement of the image field of the specified number of times. However, a monitor connection section 25 and a data communication connection section 26 are provided.

[0011]

According to the present invention, an image processing unit performs real-time arithmetic processing on an image signal and simply binarizes the image to perform image processing by moving an inspection object relative to a camera to perform image processing. When the trigger signal is input and processed in synchronization with the end of the, the processing measurement of the image field for the specified number of times is performed in synchronization with the image synchronization by inputting the trigger signal once, and the inspection object is measured at the end of the final field measurement. By performing comprehensive judgment output for the entire product, even in the case of defective product inspection, even specially inspected objects can be easily processed without using auxiliary equipment, and highly efficient processing is also extremely inexpensive. Since the shape determination can be performed at high speed and the determination error can be easily prevented, it is suitable for high precision inspection, the application range can be expanded, and the reliability can be greatly improved.

[Brief description of drawings]

FIG. 1 is a system explanatory view showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of the automatic inspection device of the example of FIG.

FIG. 3 is a diagram illustrating a relationship between conventional detection methods.

[Explanation of symbols]

 1 bottle 2 camera 3 image processing unit 4 automatic inspection device 5 window storage unit 6 window storage unit 7 monitor TV 8 camera control unit 12 data input operation unit 13 control bus 14 microprocessor 15 lookup table 16 lookup table 17 counter 18 counter

Claims (1)

[Claims] 1. An image processing unit which takes in image data from a camera for inputting an image of an inspection object and records the image data in a memory, performs real-time arithmetic processing on the image signal, and simply binarizes the image to perform image processing. When the inspection target is moved relative to the camera and the trigger signal is input and processed in synchronization with the end of the image processing, the processing measurement of the image field is performed the specified number of times with one input of the trigger signal. Is performed in synchronization with image synchronization, and a comprehensive determination output for the entire inspection object is performed at the end of final field measurement.