YSD_Users_E.pdf - 第250页

5-61 5 Creating the board data 7 Check that the mark can be recogniz ed ev en if it has mov ed. Check that the mark can be recognized in any location within the sear ch area. 1. Press the [Move Head] button to open the M…

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Creating the board data

Press the [Test] button to perform the vision test.

Repeat this test several times. If no error is detected, each parameter is appropriate so advance to the

next step. If an error occurs, make adjustments with the procedure below.

1. Press the [Cancel] button to exit the Mark Adjust mode and check whether the parameter settings

(Mark Type, Shape Type, Algorithm Type, etc.) are correct.

2. After checking the parameters, enter the Mark Adjust mode and press the [Test] button again to run

the same test. When no errors occur, move to the next step.

3. If an error still occurs, press the [Find Best] button to find an optimum threshold level.

4. After the optimum threshold level has been found, run the vision test again. If no errors occur, go to

the next step.

5. If the optimum threshold level could not be obtained, press the [Check] button. A binary image

appears on the vision monitor according to the current parameter settings as shown below.

Mark binary image

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6. Adjust the threshold level as suggested below, so that the mark image is clearly displayed.

Binary image check

State Image Countermeasure Remarks

All white

All black

Noise within mark

Noise outside of mark

Other than mark in

search area

Increase the threshold level with

the arrow buttons.

Decrease the threshold with the

arrow buttons.

Increase the Cut Inner Noise level.

Increase the Cut Outer Noise level.

Reduce the Search Area size.

Adjust it till the mark is displayed.

Recognition time becomes longer

as the Cut Inner Noise level is increased.

Recognition time becomes longer

as the Cut Outer Noise level is increased.

Refer to "Search Area"

explained previously.

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7. Press the [Find Best] button again to find an optimum threshold level.

If the result is successful, next run the vision test. When no error occurs, advance to the next step.

8. If the vision test result is a fail, enter a larger value for the Tolerance parameter on the Mark Adjust

windows, then press the [Find Best] button again.

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Creating the board data

Check that the mark can be recognized even if it has moved.

Check that the mark can be recognized in any location within the search area.

1. Press the [Move Head] button to open the Move Head window.

2 .Use the arrow buttons to move the mark slightly from the center of the search area.

3. Return to the Mark Adjust window and run the vision test once more.

When no error occurs, the parameter settings are satisfactory. If an error still occurs, press the

[Check] button and readjust the binary level.

Search Area

Center of search area

Final check for mark recognition

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Quit the Mark Adjust mode.

Press the [OK] button to quit the Mark Adjust mode.

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Creating the board data

6.6 Pattern matching

Pattern matching is a function for correcting board dimensional or reference hole errors, positioning errors

occurring from the board clamping mechanism, or local distortion of the board. To use this function, the image

of a particular board pattern must be registered as the template. Errors or distortion are corrected by comparing

the template you registered with an actual pattern being recognized. Pattern matching is useful when the

fiducial function cannot be used, for example, if the board has no fiducial marks or the mark does not match

any mark recommended by YAMAHA.

Any pattern can be used, but the pattern image should be smaller than about 1/4th of the monitor and must

meet the following conditions.

• Each pattern clearly contrasts with the board. (It is okay if the outline of each pattern is definite.)

• A pair of patterns are diagonally opposing on the board.

Pattern conditions

Pattern

Board Board

OK OK

Low contrast

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CAUTION

Pattern matching requires a longer recognition time than normal mark recognition and its accuracy may drops slightly

when compared to cases using round or square marks. It is not necessary to use pattern matching for marks which

can be correctly recognized with "Algorithm Type" set to “Normal”.