JP4006869B2 - Inspection method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an inspection method and apparatus for inspecting a product manufactured in an industrial facility based on a predetermined reference image instructed by a work, and more specifically, a product image as a work result with respect to the reference image of the work instruction as a mirror image. By making the two images touch each other on the line and shifting the tangent line so as to cover the entire product, the difference between the reference image on the tangent line and the product image of the work result can be detected easily and The present invention relates to an inspection method and apparatus that can be found intuitively.
[0002]
[Prior art]
Conventionally, in a manufacturing process of a product such as a production apparatus, a work instruction document in which work instruction information is written on paper as character information has been used as a method for providing a worker with work instruction information for the product.
[0003]
However, in recent years, in order to cope with the diversification of products such as production equipment and reduce work mistakes caused by unskilled workers, the work instruction information is digitized in place of the above paper work instructions and only character information is used. A system has been proposed in which image information is displayed on a monitor instead.
[0004]
[Problems to be solved by the invention]
By the way, in a system in which the work instruction information is digitized and displayed on the monitor as not only character information but also as image information, the worker can identify the parts on the board based on the work information displayed on the monitor. However, depending on the method of visually comparing the screen displayed on the monitor and the operation result, there is a problem in that an oversight or an error occurs, and the operation error cannot be eliminated reliably.
[0005]
In addition, a board inspection apparatus that automatically compares a work result with a work instruction screen has been proposed. However, this type of board inspection apparatus is very expensive and cannot be easily introduced. There was also a problem.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to provide an inspection method and apparatus capable of easily and intuitively inspecting a work error of a product manufactured by an industrial facility or the like.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, an image of a substrate or component (product image) on which a work has been completed is used as a mirror image with respect to a sample image of a work instruction (reference field image). Is displayed on the display screen of the display device so as to be in contact with each other on the tangent line, and the inspection of the product is performed by shifting the position of the tangent line of the mirror image so as to cover the entire surface of the substrate and the parts on the display screen.
[0008]
According to such a configuration, it is possible for an operator to easily find a work mistake if he / she is gazing only at the tangent line of the mirror image.
[0009]
That is, according to the first aspect of the present invention, in the inspection method for inspecting a product based on a predetermined reference image, the reference image and the image of the product are mirror images so that they are in contact with each other on a predetermined tangent line. The difference between the reference image on the tangent and the image of the product to be inspected can be detected while shifting two images having a mirror image relation with respect to the tangent on the display screen. .
[0010]
According to a second aspect of the present invention, in an inspection apparatus for inspecting a product based on a predetermined reference image, image input means for inputting an image of a product to be inspected from the outside, the reference image, and the input product An image synthesizing unit that processes the images so that both images touch each other on a predetermined tangent as a mirror image, and shifts both the images with respect to the tangent is provided.
[0011]
Further, in the invention described in claim 3, in the invention described in claim 2, further, the presence or absence of a difference between the reference image on the tangent line of the composite image and the product image as the work result is automatically detected. A detection means is added.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments in the case where an inspection method and apparatus according to the present invention are applied to a work support inspection method and apparatus will be described below in detail with reference to the accompanying drawings.
[0013]
A work support inspection method and apparatus to which the present invention is applied is a work support inspection method for inspecting a product manufactured in an industrial facility based on a predetermined reference image instructed to work. The reference image and the product image are displayed on the display screen so that both images touch each other on a predetermined tangent line as a mirror image, and the tangent lines on the display screen are shifted so as to cover the entire product. A difference between the reference image on the line and the product image of the work result is detected, and the product of the work result is inspected based on the detection result.
[0014]
FIG. 1 is an overall configuration diagram showing a first embodiment of a work support inspection system configured by applying an inspection method and apparatus according to the present invention.
[0015]
A work support inspection system 100 according to the first embodiment shown in FIG. 1 includes a database server (DB server) 10 to which a work instruction database (work instruction DB) 11 is connected, and a barcode reader 30 and a CCD camera 31 connected thereto. The plurality of work instruction terminals 20-1 to 20-n thus configured are connected to the network 12.
[0016]
Here, the database server 10 retrieves necessary work instruction information from the work instruction database 11 in response to requests from the work instruction terminals 20-1 to 20-n, and sends them to the work instruction terminals 20-1 to 20-n. To deliver.
[0017]
The work instruction terminals 20-1 to 20-n are terminals that display predetermined work instruction information to the worker, request the desired work instruction information from the database server 10, and obtain the work information from the worker. Display according to instructions. Also, image information for confirming that the work result is correct is displayed. The work instruction terminals 20-1 to 20-n are arranged for one worker in one manufacturing process.
[0018]
The bar code reader 30 connected to the work instruction terminals 20-1 to 20-n reads a bar code for identifying a product, for example, a lot of boards, and indicates the type of board to be assembled, etc., to the work instruction terminals 20-1 to 20-. Used to input for n.
[0019]
The imaging stand 40 is a jig for accurately imaging a substrate that has been assembled. By placing the assembly substrate 41 that has been assembled on the imaging stand 40, the assembly substrate 41 that has been assembled is almost positioned. It becomes possible to image without deviation.
[0020]
The CCD camera 31 connected to the work instruction terminals 20-1 to 20-n takes an image of the assembled substrate 41 placed on the imaging stand 40 and displays the image as the work instruction terminals 20-1 to 20-. Used to capture n.
[0021]
FIG. 2 is a block diagram showing a detailed configuration of the work instruction terminals 20-1 to 20-n shown in FIG.
[0022]
In FIG. 2, the work instruction terminal 20 includes a work instruction request unit 21, a reference image storage unit 22, an image input unit 23, an image inversion unit 24, an assembly board image storage unit 25, a composite position calculation unit 26, an image composition unit 27, A display unit 28 is provided.
[0023]
Further, as shown in FIG. 1, the work instruction terminal 20 is connected to a database server 10 to which a work instruction database 11 is connected via a network 12, and a barcode for reading a barcode for identifying a lot of substrates. A reader 30, a CCD camera 31 that images the assembled assembly board 41 placed on the imaging table 40, and a keyboard 32 that inputs various data and instructions are connected.
[0024]
Here, the work instruction requesting unit 21 requests desired work instruction information from the database server 10 based on the product type information of the assembly board which is a product input from the barcode reader 30 or the keyboard 32. The work instruction request unit 21 displays desired work instruction information on the display unit 28 in accordance with the operator's instruction.
[0025]
The reference image storage unit 22 acquires a reference image that is information on the assembly board at the time of completion of work included in the work instruction information sent from the database server 10, and stores this reference image.
[0026]
The image input unit 23 obtains an image of the assembly board 41 (an assembly board image) from the output of the CCD camera 31 that images the assembly board 41 that has been assembled and placed on the imaging base 40.
[0027]
The image reversing unit 24 performs reversal processing with respect to the Y axis (vertical direction) in order to make the assembly board image acquired from the CCD camera 31 a mirror image with respect to the reference image stored in the reference image storage unit 22. .
[0028]
The assembly board image storage unit 25 stores the assembly board image subjected to the inversion processing by the image inversion unit 24.
[0029]
The composite position calculation unit 26 displays the reference image stored in the storage device 22 and the assembly board image subjected to the inversion processing stored in the assembly board image storage unit 25 on the display unit 28 at which position. Perform the operation. Here, the operator specifies the feed amount at the position where the mirror image, that is, the reference image stored in the storage device 22 and the assembly substrate image subjected to the reversal processing stored in the assembly substrate image storage unit 25 are overlapped. Can do.
[0030]
The image composition unit 27 cuts out the reference image stored in the storage device 22 at the position calculated by the combination position calculation unit 26 and the assembly board image subjected to the inversion processing stored in the assembly board image storage unit 25. Then, as described in detail later, the reference image and the assembly board image are combined and output to the display unit 28 so that the reference image is on the upper side and the assembly board image is on the lower side.
[0031]
FIG. 3 is a flowchart showing the basic operation of the work instruction terminal 20 shown in FIG.
[0032]
In FIG. 3, the work instruction terminal 20 first makes a desired request to the database server 10 based on the assembly board type information that is a product input from the barcode reader 30 or the keyboard 32 by the work instruction request unit 21. A work instruction request for requesting work instruction information is made (step 101).
[0033]
Then, in accordance with the operator's instruction, a work instruction display for displaying the work instruction information acquired from the database server 10 on the display unit 28 is performed (step 102).
[0034]
Next, the reference image included in the work instruction information acquired from the database server 10 is stored in the reference image storage unit 22 (step 103). Then, it waits until the operator's work is completed, the assembled assembly board 41 is placed on the imaging stand 40, and the assembly board 41 is ready for imaging.
[0035]
The operator puts the assembled assembly board 41 on the imaging table 40, and when the assembly board 41 is ready for imaging, the preparation is completed from the keyboard 32, that is, the image input preparation OK of the assembly board 41 is input. I do.
[0036]
In step 104, the input of the image input preparation OK is monitored, and if there is no input of the image input preparation OK (NO in step 104), the process returns to step 104 and waits for the input of the image input preparation OK. If it is determined that there is an input (YES in step 104), an image of the assembly board 14 captured by the CCD camera 31 is input by the image input unit 23 to obtain an assembly board image (step 105).
[0037]
Next, in order to make the assembly board image acquired by the image input unit 23 a mirror image with respect to the reference image stored in the reference image storage unit 22, the image inversion unit 24 inverts the Y-axis (vertical direction). Substrate image inversion is performed (step 106).
[0038]
Here, the product image is reversed, but the product image may be left as it is and the reference image may be reversed. In short, both images may be mirror images of each other.
[0039]
The inverted assembly board image is stored in the assembly board image storage unit 25 (step 107).
[0040]
Next, the position of the tangent of the mirror image, that is, the position where the reference image stored in the storage device 22 and the assembly substrate image subjected to the reversal processing stored in the assembly substrate image storage unit 25 are overlapped by the composite position calculation unit 26. (Step 108). Here, the amount of tangential feed can be set in advance by an operator through input from the keyboard 32.
[0041]
Next, the reference image stored in the storage device 22 and the inverted assembly board image stored in the assembly board image storage unit 25 are mirror images calculated by the synthesis position calculation unit 26 by the image synthesis unit 27. The image is cut out based on the position of the tangent line, synthesized so that the reference image is up and the assembly board image is down (step 109), and this synthesized image is displayed on the display unit 28 (step 110).
[0042]
The operator confirms the vicinity of the tangent line of the composite image (mirror image) displayed on the display unit 28. Here, if the color and shape of the tangent of the mirror image are the same, it can be confirmed that there is no mistake in the work near the tangent of the mirror image.
[0043]
FIG. 4 is a diagram showing a specific example of the composite image displayed on the display unit 28 shown in FIG. 2 by the above processing.
[0044]
In FIG. 4, the reference image is an image of the substrate that has been assembled and provided as work instruction information stored in the storage device 22. The assembly board image is an image of the board actually assembled by the operator and is an inverted assembly board image stored in the assembly board image storage unit 25. Here, if there is no work mistake on the board that the operator has actually assembled, the assembled board image has a completely mirror image relationship with the reference image.
[0045]
Further, the tangent line of the mirror image is a line where the assembly board image and the reference image overlap each other when the assembly board image is a mirror image of the reference image.
[0046]
In the work instruction terminal 20 of this embodiment, both images are displayed while sequentially shifting the tangent line of the mirror image with respect to the reference image and the assembly board image displayed in a mirror image form on the display unit 28.
[0047]
That is, like the screens 50-1 to 50-7 shown in FIG. 4, the tangent positions of the mirror images of the reference image and the assembly board image are sequentially changed and displayed on the screen of the display unit 28.
[0048]
By adopting such a display format, the operator can easily determine whether or not the result of the work performed by himself / herself is consistent with the reference image if he / she looks up and down the tangent line of the mirror image.
[0049]
Returning to FIG. 3, in step 111, it is checked whether the operator inputs an instruction to stop changing the position of the tangent to the mirror image on the display unit 28 as shown in FIG. 4 from the keyboard 32. If the operator inputs a stop instruction, that is, if it is determined that there is a stop input (YES in step 111), the change of the position of the tangent of the mirror image on the display screen of the display unit 28 is stopped, and the operator Waiting for resumption input (step 113).
[0050]
On the other hand, if there is no stop input by the operator (NO in step 111), it is checked whether the screen is displayed up to the end, that is, through the screen 50-7 shown in FIG. 4 to the screen 50-1 (step 112). If it is not displayed (NO in step 112), the process returns to step 108, and the display for confirming the work is continued. However, if it is determined that it has been displayed to the end (YES in step 112), this process is terminated.
[0051]
That is, in the first embodiment, the image displayed on the display unit 28 is displayed on the screen 50- in FIG. 4 from the state in which all of both images are visible as shown in the screen 50-1 in FIG. As shown in FIG. 7, the tangent line of the mirror image is moved to a state where everything is hidden, and is displayed so as to return to the state of the screen 50-1 in FIG.
[0052]
The work inspection method in the work support inspection system of the first embodiment will be further described with reference to FIGS.
[0053]
FIG. 5 is a diagram showing a display example of the display unit 28 shown in FIG. 2 in the case where the parts as the products are correctly arranged.
[0054]
In FIG. 5, (a) shows the case where the parts which are products are correctly arranged, and (b) shows the case where the parts which are products are mistakenly arranged.
[0055]
As shown in FIG. 5 (a), when the parts are arranged correctly, the parts are displayed in the same color and shape above and below the tangent of the mirror image, but the parts are reversed as shown in FIG. 5 (b). , The color and shape of the upper and lower sides of the tangent of the mirror image are different, and it can be seen that it is erroneous at a glance.
[0056]
FIG. 6 is a diagram for explaining the difference between the viewpoint movement angle according to the conventional method and the viewpoint movement angle according to the method of the first embodiment.
[0057]
As shown in FIG. 6A, in the conventional method of comparing the reference image with the assembly board image or the board itself, a large viewpoint movement of θ1 occurs to compare whether a certain part is in accordance with the instruction. Further, in order to compare the parts with each other, it is necessary to compare the areas accompanied by the movement of the viewing angle of θ1.
[0058]
On the other hand, according to the method of the first embodiment, since the objects to be compared are displayed in a mirror image, the movement of the viewing angle is very small as θ2, and the area of comparing the whole parts is large. Since no comparison is made, mistakes and oversights are less likely to occur.
[0059]
FIG. 7 is a diagram comparing the conventional method and the method of the first embodiment when a large number of components are mounted.
[0060]
As shown in FIG. 7A, it is very difficult to visually identify a component or an insertion direction error in a short time with a conventional method in a state where a large number of components are mounted. Also, it is very painful to perform the same check for a long time.
[0061]
On the other hand, as shown in FIG. 7B, according to the method of the first embodiment, an error appears as an asymmetric image if only the part of the mirror image that is in contact is always watched. For this reason, mistakes can be found intuitively and easily. In addition, it is not necessary to compare the entire area by visual movement, and the pain to work can be minimized.
[0062]
FIG. 8 is an overall configuration diagram showing a second embodiment of a work support inspection system configured by applying the work support inspection method and apparatus according to the present invention.
[0063]
The work support inspection system 200 of the second embodiment shown in FIG. 8 has the same basic configuration as the work support inspection system 100 of the first embodiment shown in FIG. The difference is that an image scanner (scanner) 33 is used instead of the CCD camera.
[0064]
That is, in FIG. 8, the work support inspection system 200 according to the second embodiment includes a database server (DB server) 10 to which a work instruction database (work instruction DB) 11 is connected, a barcode reader 30 and an image scanner, respectively. A plurality of work instruction terminals 20-1 to 20-n to which a (scanner) 33 is connected are connected to the network 12.
[0065]
In this work support inspection system 200, since image input is input from the scanner 33, the image input from the scanner 33 is sequentially input unlike the case of the CCD camera.
[0066]
Here, the detailed configuration of the work instruction terminals 20-1 to 20-n of the work support inspection system 200 is the same as that of the first embodiment shown in FIG. Are sequentially input, and therefore only a part of the functions of the image input unit 23 shown in FIG.
[0067]
That is, the image input unit 23 in the work support inspection system 200 according to the second embodiment sequentially acquires the image of the assembly substrate 41 placed on the scanner 33 from the scanner 33 according to the designated feed amount. become. Other configurations are the same as those shown in FIGS. 1 and 2.
[0068]
Next, operations of the work instruction terminals 20-1 to 20-n in the work support inspection system 200 according to the second embodiment will be described.
[0069]
FIG. 9 is a diagram showing a display example by the display unit 28 of the work instruction terminals 20-1 to 20-n shown in FIG.
[0070]
In the second embodiment, the assembly board images acquired from the scanner 33 by the work instruction terminals 20-1 to 20-n are sequentially input / displayed from the lower end of the screen of the display unit 28. In the embodiment, the reference image and the assembly board image are displayed while the tangent of the mirror image sequentially moves from the lower end of the screen shown in the screen 52-1 of FIG. 9 to the center shown in the screen 52-7.
[0071]
Here, the assembly board image acquired from the scanner 33 is normally input from the upper end, but since this assembly board image is inverted by the image inversion unit 24 to become a mirror image, the input image is displayed on the screen 52-1. As shown to 52-7, it will go to an upper end from a lower end.
[0072]
Even in such a configuration, the worker can intuitively and easily find a work mistake simply by moving the viewpoint in accordance with the movement of the tangent of the mirror image.
[0073]
FIG. 10 is a flowchart showing the basic operation of the work instruction terminal in the work support inspection system shown in FIG.
[0074]
In the flowchart shown in FIG. 10, the work instruction terminal 20 shown in FIG. 2 is referred to.
[0075]
In FIG. 10, the work instruction terminal 20 first makes a desired request to the database server 10 based on the type information of the assembly board that is a product input from the barcode reader 30 or the keyboard 32 by the work instruction request unit 21. A work instruction request for requesting work instruction information is made (step 201).
[0076]
Then, in accordance with the operator's instruction, a work instruction display for displaying the work instruction information acquired from the database server 10 on the display unit 28 is performed (step 202).
[0077]
Next, the reference image included in the work instruction information acquired from the database server 10 is stored in the reference image storage unit 22 (step 203). Then, it waits until the operator's work is completed, the assembled assembly board 41 is placed on the imaging stand 40, and the assembly board 41 is ready for imaging.
[0078]
The operator puts the assembled assembly board 41 on the scanner 33, and when the assembly board 41 is ready to be read, the operator completes the preparation from the keyboard 32, that is, inputs the image input preparation OK of the assembly board 41. .
[0079]
In step 204, the input of the image input preparation OK is monitored, and if there is no input of the image input preparation OK (NO in step 204), the process returns to step 204 and waits for the input of the image input preparation OK. If it is determined that there is an input (YES in step 204), an assembly board image is acquired from the scanner 33 for the designated feed amount (step 205). Here, the operator can specify this feed amount.
[0080]
Next, in order to make the assembly board image acquired by the image input unit 23 a mirror image with respect to the reference image stored in the reference image storage unit 22, the image inversion unit 24 inverts the Y-axis (vertical direction). Substrate image inversion is performed (step 206).
[0081]
The inverted assembly board image is stored in the assembly board image storage unit 25 (step 207).
[0082]
Next, the position of the tangent of the mirror image, that is, the position where the reference image stored in the storage device 22 and the assembly substrate image subjected to the reversal processing stored in the assembly substrate image storage unit 25 are overlapped by the composite position calculation unit 26. (Step 208).
[0083]
Next, the reference image stored in the storage device 22 and the inverted assembly board image stored in the assembly board image storage unit 25 are mirror images calculated by the synthesis position calculation unit 26 by the image synthesis unit 27. Cut out based on the position of the tangent line, and as shown in the screens 52-1 to 52-7 shown in FIG. 9, the reference image is combined and the assembly board image is combined (step 209), and this combined image is displayed. The information is displayed on the unit 28 (step 210).
[0084]
The operator confirms the vicinity of the tangent line of the composite image (mirror image) displayed on the display unit 28. Here, if the color and shape of the tangent of the mirror image are the same, it can be confirmed that there is no mistake in the work near the tangent of the mirror image.
[0085]
Next, in step 211, it is checked whether the operator has input a stop instruction for changing the position of the tangent of the mirror image on the display unit 28 from the keyboard 32 as shown in FIG. Here, when the operator inputs a stop instruction, that is, when it is determined that there is a stop input (YES in step 211), the change of the position of the tangent of the mirror image on the display screen of the display unit 28 is stopped, and the operator Waiting for resumption input (step 213).
[0086]
On the other hand, if there is no stop input by the operator (NO in step 211), it is checked whether it has been displayed up to the end, that is, the screen 52-7 shown in FIG. 9 (step 212). (NO in step 212) Returning to step 208, the display for confirming the work is continued, but if it is determined that the display has been displayed to the end (YES in step 212), this process ends.
[0087]
In other words, in the second embodiment, the image displayed on the display unit 28 can be seen from the state of the screen 50-1 in FIG. 9 as shown in the screen 50-7 in FIG. The tangent line of the mirror image is moved to a state where it is in this state, and this process is terminated.
[0088]
In the second embodiment, the scanner is used for image input. However, the line sensor is used to move the line sensor with respect to the inspection target product placed on the imaging table, or You may comprise so that an imaging stand may be moved with respect to a line sensor.
[0089]
【The invention's effect】
As described above, according to the present invention, an image of a substrate or component (product image) that has been completed with respect to a sample image (reference image) of a work instruction is used as a mirror image, and the mirror images overlap and both drawings are displayed. Displayed on the display screen of the display device so that it touches on the tangent line, and the product is inspected by shifting the position of the tangent line of the mirror image so as to cover the entire surface of the board and parts on the display screen. So
1) The operator only needs to confirm whether the tangent line where the mirror image touches is the same color and shape.
2) Since it is only necessary to check on the tangent line, it is possible to easily find mistakes such as mistakes in the insertion direction of parts on the spot
3) Since it is only necessary to check on the tangent line, it is possible to easily and quickly inspect a complex product on which a large number of parts are mounted.
4) It is possible to easily and intuitively inspect products because there is no comparison of the area for comparing the entire product only by checking on the tangent line.
There are effects such as.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram showing a first embodiment of a work support inspection system configured by applying an inspection method and apparatus according to the present invention.
2 is a block diagram showing a detailed configuration of the work instruction terminal shown in FIG. 1. FIG.
FIG. 3 is a flowchart showing basic operations of the work instruction terminal shown in FIG. 2;
4 is a diagram showing a specific example of a composite image displayed on the display unit shown in FIG. 2. FIG.
FIG. 5 is a diagram showing a display example of the display unit shown in FIG. 2 in the case where the parts that are products are correctly arranged;
FIG. 6 is a diagram for explaining a difference between a viewpoint moving angle according to a conventional method and a viewpoint moving angle according to the method of the first embodiment;
FIG. 7 is a diagram comparing a conventional method and a method according to the first embodiment when a large number of components are mounted.
FIG. 8 is an overall configuration diagram showing a second embodiment of a work support inspection system configured by applying the work support inspection method and apparatus according to the present invention.
9 is a diagram showing a display example by the display unit of the work instruction terminal shown in FIG.
10 is a flowchart showing the basic operation of the work instruction terminal in the work support inspection system shown in FIG. 8. FIG.
[Explanation of symbols]
10 Database server (DB server)
11 Work instruction database (work instruction DB)
12 network
20, 20-1 to 20-n Work instruction terminal
21 Work instruction request section
22 Reference image storage unit
23 Image input section
24 Image reversal part
25 Assembly board image storage unit
26 Composite Position Calculation Unit
27 Image composition part
28 Display section
30 Bar code reader
31 CCD camera
32 keyboard
33 Image scanner (scanner)
40 Imaging stand
41 Assembly board
100, 200 Work support inspection system

Claims (3)

In an inspection method for inspecting a product based on a predetermined reference image,
The reference image and the product image are displayed on the screen so as to be in a mirror image relationship with each other so as to touch on a predetermined tangent line,
An inspection method, wherein a difference between the reference image on the tangent line and the image of the product to be inspected can be detected while shifting two images having a mirror image relationship with respect to the tangent line on the display screen. In an inspection device that inspects a product based on a predetermined reference image,
Image input means for inputting an image of the product to be inspected from the outside;
An image composition means for processing the reference image and the input product image into an image such that both images are in contact with each other on a predetermined tangent line as a mirror image, and shifting both images with respect to the tangent line;
An inspection apparatus comprising: further,
3. The inspection apparatus according to claim 2, further comprising detection means for automatically detecting whether or not there is a difference between the reference image on the tangent line of the composite image and the product image as the work result.

Images