TWI521191B - Correction method applied to optical detection device - Google Patents

Description

Correction method for optical detecting device

The present invention relates to a method for correcting an optical detecting device, and more particularly to a method for correcting self-verification on a line for an optical detecting device.

In order to ensure the consistency of product quality, quality monitoring is required through the inspection instrument during the manufacturing process. The testing instruments currently used are rooted in a common measurement standard and can be corrected at any time. If this is not the case, in the manufacturing process, it may cause great losses due to the misalignment of the measurement standards. The error of the test instrument usually increases with the time of use, so any test instrument should be regularly calibrated to ensure accuracy.

In the case of Automated Optical Inspection (AOI) equipment, it is a precision optical instrument. However, after an uninterrupted use on the production line for a long time, errors may occur due to errors. If you find these errors when you wait for periodic maintenance, letting customers ship the products that are misjudged will result in customer goodwill and cost loss.

Therefore, how to provide a correction method that can be quickly found when the detection instrument generates an error is one of the problems that the industry is eager to invest in research and development resources.

Accordingly, the present invention provides a correction method for an optical detecting device to solve the above problems.

The present invention provides a calibration method for an optical detecting device. The optical detecting device is disposed above the conveying device. The delivery device has a calibration sheet. The conveying device is configured to convey the object to be tested to the detection area. The calibration method includes: when the detection area has no object to be tested, the conveying device generates a vacancy signal to the optical detecting device; the optical detecting device captures the detection area to obtain a vacancy image, wherein the vacancy image has a first calibration sheet pattern, and the first correction The slice pattern corresponds to the complete calibration slice; and after the optical detection device receives the vacancy signal, it is determined whether the optical parameters of the optical detection device are respectively within a corresponding tolerance range according to the first calibration slice pattern.

The present invention further provides a calibration method for an optical detecting device. The optical detecting device is disposed above the conveying device. The delivery device has a calibration sheet. The conveying device is used to convey the object to be tested into the detection zone. The calibration method comprises: the conveying device transports the object to be tested according to the conveying signal to the detection area; when the optical detecting device receives the conveying signal, the detection area is photographed, thereby obtaining a conveying image, wherein the conveying image has a correction piece pattern, and the correction piece pattern corresponds to the correction At least a portion of the sheet; and the optical detecting device determines whether the optical parameters of the optical detecting device are respectively corresponding to the tolerance according to the calibration sheet pattern Within the scope.

1‧‧‧Optical inspection device

10‧‧‧Photography module

2‧‧‧Conveyor

20‧‧‧ Pedestal

22‧‧‧Land

24‧‧‧ calibration film

3‧‧‧Test object

4‧‧‧Detection area

S100~S306‧‧‧Steps

Fig. 1 is a side view showing an optical detecting device and a conveying device according to an embodiment of the present invention.

Fig. 2 is a top view showing the conveying device of Fig. 1.

FIG. 3 is a flow chart showing a method for correcting an optical detecting device according to an embodiment of the present invention.

4 is a flow chart showing a method for correcting an optical detecting device according to another embodiment of the present invention.

Please refer to Figure 1 and Figure 2. Fig. 1 is a side view showing an optical detecting device 1 and a transporting device 2 according to an embodiment of the present invention. Fig. 2 is a top view showing the conveying device 2 in Fig. 1. As shown in FIGS. 1 and 2, in the present embodiment, the correction method is used for the optical detecting device 1, and the optical detecting device 1 is disposed above the transport device 2. The structure, function, and connection relationship between the above elements will be described in detail below.

As shown in FIGS. 1 and 2, the optical detecting device 1 includes a photographing module 10. The photographing direction of the photographing module 10 faces the transporting device 2, and the visual range of the photographing module 10 defines a detecting area 4 (as indicated by a broken line in Fig. 2). The conveyor 2 comprises a base 20 and two belts 22. Conveying device 2 The belt 22 is run in parallel on the susceptor 20, and the object to be tested 3 can be transported to the detection area 4 of the photographic module 10 for optical detection by the optical detecting device 1. Furthermore, the transport device 2 also has a correction strip 24. The correction sheet 24 is disposed on the base 20 between the two belts 22 and located in the detection area 4. In other words, the correction sheet 24 must be located in the detection area 4, and the optical detection apparatus 1 can perform correction accordingly. In particular, since the correction sheet 24 is disposed between the two belts 22 and the traveling path of the object 3 to be tested (that is, when the object to be tested 3 enters the detection area 4, the correction sheet 24 is concealed), Rather than being disposed outside the object to be tested 3, it is practically configurable to enlarge the area occupied by the object to be tested 3 in the detection area 4, so that the camera module 10 can obtain more information of the object to be tested 3, thereby enabling The results of detection or measurement are also more stable and accurate.

Please refer to FIG. 3, which is a flow chart showing a method for correcting the optical detecting device 1 according to an embodiment of the present invention.

As shown in FIG. 3, with reference to FIGS. 1 and 2, in the present embodiment, the correction method includes steps S100 to S106 as follows.

Step S100: When the detection area 4 has no object 3 to be tested, the conveying device 2 generates a vacancy signal to the optical detecting device 1.

Step S102: The optical detecting device 1 captures the detection area 4 to obtain a vacancy image, wherein the vacancy image has a first correction sheet pattern, and the first correction sheet pattern corresponds to the complete correction sheet 24.

Step S104: After receiving the vacancy signal, the optical detecting device 1 determines whether the optical parameters of the optical detecting device 1 are respectively within the corresponding allowable range according to the first calibration slice pattern.

If the result of the determination in step S104 is no (that is, the optical detection device If the optical parameter set to 1 exceeds the corresponding allowable range, the step S106 is further performed according to the correction method of the present embodiment.

Step S106: Generate a correction warning signal.

In the actual operation process on the production line, it is not necessary to have the object to be tested 3 at each station of the conveying device 2, which may be removed first because of defective products in the front stage process, or a section which occurs when the raw materials are replaced. buffer. By applying the correction method of the present embodiment, when the object 3 to be tested is present at the station of the conveying device 2 and the object to be tested 3 enters the detecting area 4, the object to be tested 3 completely shields the correction sheet 24, and It will affect the normal algorithm detection; when there is no object 3 on the station, the camera module 10 still performs the image capturing operation, and the calibration film 24 will appear in the middle of the image to perform self-verification.

Therefore, the correction method of the present embodiment is such that when the optical detecting device 1 has a neutral position at the station of the transport device 2 (that is, there is no object 3 in the detecting region 4), the photographing module 10 has already taken the photographing module 10 The correction sheet 24 placed on the susceptor 20 performs optical parameter alignment on the first correction sheet pattern in the captured vacancy image. If the result of the judgment indicates that the condition of the photographing module 10 is already below the allowable range, the operator can be immediately notified of the correction treatment.

In one embodiment, the correction patch 24 has a complex array line pair. The optical parameters of the camera module 10 of the optical detecting device 1 include a focus value and a resolution. The step of determining whether the optical parameter is within the corresponding tolerance range according to the first correction sheet pattern (ie, step S104) further includes step S104a.

Step S104a: according to the first line pair pattern in the first correction sheet pattern The case determines whether the focus value and the resolution are respectively within a corresponding tolerance range, wherein the first line pair pattern corresponds to the complete complex array line pair.

In one embodiment, the correction sheet 24 has a gray card. The optical parameters of the camera module 10 of the optical detecting device 1 include image grayscale values. The step of determining whether the optical parameter is within the corresponding tolerance range according to the first correction sheet pattern (ie, step S104) further includes step S104b.

Step S104b: Determine whether the image grayscale value is within a corresponding tolerance range according to the first gray card pattern in the first calibration slice pattern, wherein the first gray card pattern corresponds to the complete gray card.

However, the optical parameters of the photographic module 10 are not limited to the above-mentioned focus value, resolution, and gray scale value. If a certain optical parameter is to be corrected, as long as a correction unit comparable to the optical parameter is provided on the calibration sheet 24, the correction method of the present embodiment can also achieve the function of correcting the warning for the optical parameter.

Further, the correction method of the present embodiment further includes steps S108 to S112 as follows.

Step S108: The conveying device 2 conveys the object to be tested 3 to the detection zone 4 according to the conveying signal.

Step S110: When the optical detecting device 1 receives the transport signal, the detection region 4 is photographed to obtain a transport image, wherein the transport image has a second patch pattern, and the second patch pattern corresponds to at least a portion of the patch 24.

It should be noted that when the optical detecting device 1 receives the transmission signal, the photography module 10 continuously captures the detection area 4 to obtain the above-mentioned conveyed image.

Step S112: The optical detecting device 1 determines whether the optical parameters of the optical detecting device 1 are respectively within the corresponding allowable range according to the second correcting slice pattern.

If the result of the determination in step S112 is NO (that is, the optical parameter of the optical detecting device 1 exceeds the corresponding allowable range), the correcting method according to the present embodiment executes step S106 again.

That is to say, the correction method of the present embodiment not only enables the optical detecting device 1 to achieve the function of correcting the warning when the station of the conveying device 2 has a neutral position, when the station of the conveying device 2 has no neutral position (ie, When the object to be tested 3 is entering or moving out of the detection area 4, at least a part of the correction sheet 24 that has been placed on the susceptor 20 can still be photographed by the photographic module 10 without stopping the machine, and the captured image is taken. The second patch pattern in the transport image performs an optical parameter alignment. Similarly, if the result of the judgment indicates that the condition of the photographing module 10 is already below the allowable range, the operator can be notified immediately of the correction treatment.

It should be noted that, in the step of determining whether the optical parameter is within the corresponding tolerance range according to the second calibration slice pattern (ie, step S112), steps similar to steps S104a and S104 may be further included, but only The pattern of the alignment is changed to the second calibration sheet pattern, and details are not described herein again. Therefore, when the station of the transport device 2 has no space, the correction method according to the embodiment can still achieve the function of correcting the warning for the optical parameters such as the focus value, the resolution and the gray scale value of the photographing module 10.

Please refer to FIG. 4, which is a flow chart showing a method for correcting the optical detecting device 1 according to another embodiment of the present invention.

As shown in Fig. 4, with reference to Figs. 1 and 2, in the present embodiment, the correction method includes steps S300 to S306 as follows.

Step S300: The conveying device 2 conveys the object to be tested 3 to the detection zone 4 according to the conveying signal.

Step S302: When the optical detecting device 1 receives the transmission signal, the detection area 4 is photographed, thereby obtaining a transport image, wherein the transport image has a correction sheet pattern, and the correction sheet pattern corresponds to at least a portion of the correction sheet 24.

Step S304: The optical detecting device 1 determines whether the optical parameters of the optical detecting device 1 are respectively within the corresponding allowable range according to the calibration piece pattern.

If the result of the determination in step S304 is NO (that is, the optical parameter of the optical detecting device 1 exceeds the corresponding allowable range), the correcting method according to the present embodiment further performs step S306.

Step S306: Generate a correction warning signal.

It can be seen that the correction method of the present embodiment can make the optical detecting device 1 still in the position when the station of the conveying device 2 has no neutral position (that is, when the object to be tested 3 is entering or moving out of the detecting area 4). Under the condition of the shutdown, at least a portion of the correction sheet 24 that has been placed on the susceptor 20 is photographed by the photographic module 10, and an optical parameter comparison is performed on the correction sheet pattern in the captured conveyed image. If the result of the judgment indicates that the condition of the photographing module 10 is already below the allowable range, the operator can be immediately notified of the correction treatment.

It should be noted that when the optical detecting device 1 receives the transmission signal, the photography module 10 continuously captures the detection area 4 to obtain the above-mentioned conveyed image.

In one embodiment, the correction patch 24 has a complex array line pair. Optical parameters include focus values and resolution. The step of determining whether the optical parameter is within the corresponding tolerance range according to the correction patch pattern (ie, step S304) further includes step S304a.

Step S304a: Determine whether the focus value and the resolution are respectively within a corresponding tolerance range according to the line pair pattern in the calibration slice pattern, wherein the line pair pattern corresponds to at least a part of the complex array line pair.

In one embodiment, the correction sheet 24 has a gray card. The optical parameters contain image grayscale values. The step of determining whether the optical parameter is within the corresponding tolerance range according to the pattern of the correction sheet 24 (that is, step S304) further includes step S304b.

Step S304b: Determine whether the image grayscale value is within a corresponding tolerance range according to the gray card pattern in the calibration slice pattern, wherein the gray card pattern corresponds to at least a portion of the gray card.

Therefore, when the station of the conveying device 2 has no neutral position, the correction method according to the embodiment can still achieve the function of correcting the warning for the optical parameters such as the focus value, the resolution and the gray scale value of the photographing module 10.

From the above detailed description of the specific embodiments of the present invention, it can be clearly seen that the correction method of the present invention enables the optical detecting device to be driven by the vacancy signal transmitted by the conveying device when the station of the conveying device has a neutral position. The photographic module captures a calibration sheet that has been placed on the pedestal and performs optical parameter alignment on the calibrated patch pattern in the captured vacancy image. Moreover, the calibration method of the present invention can also enable the optical detecting device to be driven according to the conveying signal transmitted by the conveying device when the station of the conveying device has no neutral position. The photographic module captures at least a portion of the calibrated sheet that has been placed on the pedestal and performs optical parameter alignment on the calibrated sheet pattern in the captured image being photographed. In other words, regardless of whether the station of the conveying device has a neutral position, the correction method of the present invention can quickly find the error generated by the optical detecting device without stopping the machine, and immediately notify the operator that the condition is lower than the allowable range. The optical detecting device performs correction processing. Moreover, in order to cooperate with the calibration method of the present invention, the calibration sheet can be disposed between the two belts and the path of the object to be tested, and does not need to be disposed outside the object to be tested, so that the object can be configured to be tested. The area occupied by the area is enlarged, so that the photography module can obtain more information of the object to be tested, thereby making the result of detection or measurement more stable and accurate.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

S100~S112‧‧‧Steps

Claims (10)

A calibration method for an optical detecting device, wherein the optical detecting device is disposed above a conveying device, the conveying device has a correcting piece for conveying a sample to be detected to a detecting area, the correcting method The method includes: when the detection area has no object to be tested, the conveying device generates a vacancy signal to the optical detecting device; the optical detecting device captures the detecting area to obtain a vacancy image, wherein the vacancy image has a first correction a slice pattern, and the first calibration slice pattern corresponds to the complete calibration slice; after receiving the vacancy signal, the optical detection device determines, according to the first calibration slice pattern, whether the optical parameters of the optical detection device are respectively within a corresponding allowable range The conveying device transports the object to be tested according to a conveying signal; when the optical detecting device receives the conveying signal, the detecting area is photographed to obtain a conveying image, wherein the conveying image has a second Correcting a sheet pattern, and the second sheet pattern corresponds to at least a portion of the sheet; and the optical detecting device root The second correction pattern sheet is determined whether the plurality of the optical parameter within the range corresponding to the allowable range, respectively. For example, the calibration method described in claim 1 of the patent scope, wherein When the optical detecting device receives the transmitting signal, the detecting area is continuously captured to obtain the transport image. The calibration method of claim 1 or 2, further comprising: generating a correction warning signal when the optical parameter of the optical detecting device exceeds the corresponding allowable range. The calibration method of claim 1 or 2, wherein the calibration sheet has a complex array line pair, the optical parameters including a focus value and a resolution, and determining the optical parameters according to the first calibration sheet pattern. Whether the step is within the corresponding tolerance range further includes: determining, according to one of the first line pair patterns in the first calibration sheet pattern, whether the focus value and the resolution are respectively within a corresponding tolerance range, The first pair of patterns corresponds to the complete set of pairs. The calibration method of claim 1 or 2, wherein the calibration sheet has a gray card, and the optical parameters include an image grayscale value, and determining whether the optical parameters are interposed according to the first calibration patch pattern. The step of the corresponding tolerance range further includes: determining, according to one of the first gray card patterns in the first calibration slice pattern, whether the image grayscale value is within the corresponding tolerance range, wherein the first gray card The pattern corresponds to the complete gray card. A calibration method for an optical detecting device, wherein the optical The detecting device is disposed above a conveying device, and the conveying device has a calibration piece for conveying a sample to be detected into a detection area, the correction method comprises: the conveying device is to be tested according to a conveying signal The object is transported to the detection area; when the optical detection device receives the transmission signal, the detection area is photographed, thereby obtaining a transport image, wherein the transport image has a correction sheet pattern, and the correction sheet pattern corresponds to at least the correction sheet And a part of the optical detecting device determines whether the optical parameters of the optical detecting device are respectively within a corresponding tolerance range according to the calibration piece pattern. The calibration method of claim 6, wherein when the optical detecting device receives the transmitting signal, the detecting area is continuously captured to obtain the transport image. The calibration method of claim 6 or 7, wherein the calibration sheet has a complex array line pair, the optical parameters including a focus value and a resolution, and determining whether the optical parameters are based on the calibration slice pattern The step of the corresponding tolerance range further includes: determining, according to a line pair pattern in the calibration sheet pattern, whether the focus value and the resolution are respectively within a corresponding tolerance range, wherein the line pair pattern Match at least part of the set of pairs. The calibration method of claim 6 or 7, wherein the calibration sheet has a gray card, and the optical parameters include an image grayscale value. Determining, according to the calibration slice pattern, whether the optical parameters are within the corresponding tolerance ranges further comprises: determining, according to one of the gray card patterns in the calibration slice pattern, whether the image grayscale value is corresponding to the tolerance Within the scope, wherein the gray card pattern corresponds to at least a portion of the gray card. The calibration method of claim 6 or 7, further comprising: generating a correction warning signal when the optical parameter of the optical detecting device exceeds the corresponding allowable range.