JP3585224B2 - Image processing device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus that inspects an object such as an industrial product by image processing, inspects a defect, or measures a dimension, and determines the quality of the object.
[0002]
[Prior art]
As shown in FIG. 1, when an object is inspected for defects by image processing, it is often convenient to store an NG image. After the saving, the NG image is a processed image, for example, a binary image, and the image No. And inspection results and inspection values. Also, as shown in FIG. 2, the same applies to the case where an object is measured by image processing and the size of the object is determined.
[0003]
Usually, inspection or measurement by image processing has a plurality of inspection items or measurement items, and one inspection item or measurement item is also made up of a plurality of processing steps. For example, in measurement 3 in FIG. 3, the image processing includes three steps 1 (binarization), step 2 (noise removal), and step 3 (area measurement → inspection value).
[0004]
[Problems to be solved by the invention]
In the determination process after these steps, pass / fail is determined. Even when the stored NG image is viewed, the inspection item or measurement item that has failed and its inspection value or measurement value are stored. However, since the processing status in each processing step at which the inspection value or the measured value is output is not known, an inconvenience may occur. For example, whether or not the processing result is really correct or whether the determination value at that time is really appropriate cannot be determined only by displaying the processing screen.
[0005]
In addition, a processed image for each step of each inspection item or measurement item can be stored, but there are the following problems. (1) Assuming that an image is a VGA size and 300 KB (kilobytes) per monochrome image, for example, if there are 10 steps (3 inspection items) in total, the image size is 3 MB (megabytes), and the memory of the image processing apparatus is limited. Thus, at most, only a few NG screens can be taken out of several step screens. (2) It takes about 10 ms to transfer one image to the memory of the NG image storage area, and about 0.1 sec for 10 steps. Therefore, when the time allowed for the image processing is equal to or less than 0.1 sec, the condition is not satisfied. In reality, the time allowed for image processing recently is almost 0.1 sec or less.
[0006]
Therefore, an object of the present invention is to enable an image processing apparatus for inspection or measurement to store, in a reasonable state, necessary items for each processing step in addition to an original image of a defective object. It is.
[0007]
[Means for Solving the Problems]
Based on the above object, the present invention captures an object of image processing with a TV camera, compares an inspection value or measurement value obtained by performing image processing on an image from the TV camera with a determination value, In an inspection or measurement image processing apparatus that determines the acceptability of an object and outputs a result of the determination, when the object is defective, the original image of the defective object is replaced with an image (work) No. , Inspection values or measurement values, determination values, determination symbols, and OK / NG for each inspection item as determination results.
[0008]
In particular, according to the present invention, in the above-described image processing apparatus, the stored original image of the defective object is read out, and the re-inspection or re-inspection accompanied by the step feed of the image processing is performed using the judgment value stored together with the original image. The measurement can be performed.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 4 shows the configuration of the image processing apparatus 1 for inspection or measurement of the present invention, and FIG. 5 shows the configuration of the memory 7. In FIG. 4, the TV camera 2 captures an image of an object 3 to be subjected to image processing, converts an image signal of the image signal by an A / D converter 4, and stores the image signal in a frame memory 5 as an image of the object 3.
[0010]
The CPU 6 transfers the image of the object 3 to the work area of the memory 7, executes an inspection or measurement image processing program, and performs an image processing on the image according to data and parameters. Alternatively, the measurement value is compared with the determination value to determine the acceptability of the object 3, and a determination result is output.
[0011]
In the course of executing the image processing program, the CPU 6 displays necessary images on the display 8 via the bus 9, the video memory 10, and the D / A converter 11, and controls the bus 9 and the input / output unit 12. Thereafter, necessary data and commands are exchanged with the external device 13 such as a keyboard and a mouse.
[0012]
As shown in FIG. 5, a program, data, and parameters (judgment values, symbols, and image processing parameters) for image processing for inspection or measurement are stored in a predetermined area in the memory 7.
[0013]
If the result of the determination is NG, the original image of the defective object 3 is transferred from the work area of the memory 7 to the NG image storage area, where it is recorded and stored. In the NG image storage area, the maximum number N of the original images that can be stored is predetermined, and the original images are sequentially input from the first, and when the maximum number N is reached, the upper image is drawn again from the first. The image (work) No. when the image is determined to be NG is determined. , The inspection value, the judgment value, the judgment symbol, and the judgment result are also stored in the NG image attached data area of the memory 7.
[0014]
The judgment value is a judgment value in the parameters used in the image processing, and the judgment symbol is a symbol such as >><=> =. Since this parameter (judgment value) can be changed during the automatic operation by the operator, it is necessary to save the parameter together with the NG image and the inspection value. Since the judgment symbol cannot be changed, it is not always necessary to save it in the area of the NG image attached data. The judgment symbol can be confirmed by referring to the parameters later.
[0015]
For example, in the case of the measurement 3 in FIG. 3 described above, the reexamination is performed according to a flowchart shown in FIG. This flowchart is applied at the time of automatic inspection, at the time of manual inspection, and at the time of re-inspection. Automatic inspection is usually an in-line process, and manual inspection is performed off-line. At the time of the automatic inspection and the manual inspection, the object 3 is imaged and stored in the frame memory 5 via the A / D converter 4 before performing image processing for inspection or measurement.
[0016]
On the other hand, is re-examination a re-examination? In the first step, the original image already stored in the NG image storage area of the memory 7 is replaced with the image (work) No. Is transferred to the frame memory 5, and is performed by a process involving a step feed of image processing using the determination value stored together with the original image. Designation (selection) of the stored image is performed by pointing the [right key] or [left key] on the operation unit display with the keyboard or mouse of the external device 13.
[0017]
The judgment value used in the inspection or measurement is a judgment value of the parameter in the automatic inspection and the manual inspection, but is a judgment value of the data attached to the NG image in the re-inspection. The manual inspection and the automatic inspection perform the processing to the end without the intervention of an operator. But in the re-examination, the worker re-examined? By selecting Yes for each step, the display of the original image in FIG. 7, the display of the processed image (step 1) in FIG. 8, the display of the processed image (step 2) in FIG. 9, and the processed image in FIG. (Step 3) is displayed, and each screen is confirmed.
[0018]
The display contents of the display 8 include an original image, a processed image (step 1), a processed image (step 2), a processed image (step 3), and an image (work) No. , Measurement result display or determination result, operation unit display, inspection value, determination value, determination symbol, and the like.
[0019]
In the reexamination, the operator operates the operation button of [step forward] of the operation unit display displayed on the display 8 with the keyboard or the mouse on the confirmation screens of FIGS. The measurement item being processed is displayed in reverse characters as shown in FIG. Here, only measurement 3 has been described, but the same applies to measurement 1 (for example, width measurement) and measurement 2 (for example, height measurement).
[0020]
When the operator enters the reexamination screen, the operator first uses the triangle symbol [right key] or [left key] on the operation unit display to display the image No. Is updated, an NG image is selected, and each step processing and display are performed in the order of measurement 1 → measurement 2 → measurement 3. The end of the reexamination is performed by selecting the [Return] button on the operation unit display, and selecting another NG image by selecting the [Right key] or [Left key]. At the stage when the NG image is selected, as shown in FIG. 7, the display of the processing result (OK / NG) of each inspection item or measurement item and the display of the original image are performed.
[0021]
The operator performs the re-examination by pressing the [Step Forward (Start)] button only for the image to be processed while viewing the original image of the NG image and the inspection result with the [right key] or [left key]. The processed image at the step can be confirmed. In the final step of each inspection item, a judgment value, an inspection value, and a judgment symbol are displayed, and the judgment process can be confirmed numerically. Naturally, the display of the judgment value, the inspection value, and the judgment symbol is provided for each inspection item.
[0022]
So far, it has been described that the determination process can be confirmed at each step in each inspection item, but each step is omitted, and for each inspection item, for example, inspection 1 → inspection 2 → inspection 3, Even if it can be confirmed, it is possible to know more detailed information than to simply display the processed image of the NG image as shown in FIG. Of course, on the confirmation screen of each inspection item, a judgment value, a judgment symbol, and an inspection value are displayed as shown in FIG.
[0023]
【The invention's effect】
In the present invention, the original image, the work No. , Inspection values, judgment values, judgment symbols, judgment results are stored and re-inspected, so that inspection or measurement is performed at each step, and the processed image is checked with the inspection values, judgment values, judgment symbols, and the judgment is made. Can be checked for validity.
[Brief description of the drawings]
FIG. 1 is a display example of an NG image in an inspection.
FIG. 2 is a display example of an NG image in measurement.
FIG. 3 is a flowchart of processing steps of measurement 3.
FIG. 4 is a block diagram of the image processing apparatus.
FIG. 5 is an explanatory diagram of a memory area.
FIG. 6 is a flowchart of processing steps at the time of step feeding.
FIG. 7 is a display example of an initial image at the time of step feed.
FIG. 8 is a display example of a processed image (step 1) at the time of step feed.
FIG. 9 is a display example of a processed image (step 2) at the time of step feeding.
FIG. 10 is a display example of a processed image (step 3) at the time of step feed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Image processing apparatus for inspection or measurement 2 TV camera 3 Object 4 A / D converter 5 Frame memory 6 CPU
7 memory 8 display 9 bus 10 memory 11 D / A converter 12 input / output unit 13 external device

Claims (1)

The object of image processing is imaged with a TV camera, and the inspection value or measurement value obtained by performing image processing on the image from the TV camera is compared with a determination value to determine the acceptability of the object and determine the result of the determination. In the image processing apparatus for inspection or measurement to be output, when the result of the above determination indicates that the target is defective, the original image of the defective target is replaced with the image (work) No. , The inspection value or the measurement value, the judgment value, the judgment symbol, and the judgment result are stored together, the original image of the stored defective object is read out, and the image processing steps are performed using the judgment value stored together with the original image. An image processing apparatus capable of performing re-inspection or re-measurement with feeding .

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