YSP_Users_E.pdf - 第140页

4-37 4 Creating and setting the data 7.4 Vision parameters In the list on the [Mark]-[V ision] tab, set the following parameters used for mark recognition. Vision parameters 64432-L3-20 A: Sur face T ype T his specifies …

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Creating and setting the data

A, B: Mark Out Size

Referring to the table below, enter the correct value in the mark size. The "Mark Size X" is displayed when "Mark Type"

on the [Basic] tab is set to "Sp. Shape".

Mark Out Size settings

Example

Mark Out Size setting Shape Type

Circle

Square

Triangle

Sp. Shape

Corner

Enter the diameter.

Enter the length of each side.

Enter the length of one side.

Enter the X length for the MarkOutSize X, and the Y

length for the MarkOutSize Y.

Enter the length of the shorter side displayed within the

search area.

63421-L3-00

C: Mark Area

Enter the area of the mark in units of square millimeters. This parameter is displayed only when "Shape Type" on the

[Shape] tab is set to "Sp. Shape".

D: Outline

Enter the perimeter length of the mark in units of millimeters.

This parameter is displayed only when "Shape Type" on the [Shape] tab is set to "Sp. Shape".

NOTE

A recognition error may occur due to environmental conditions such as illumination. In such cases, enter a larger

value than previously used for

"Tolerance" of the Vision parameters, or set the tolerance to 100%, then perform the

vision test in the Mark Adjust mode and enter the obtained data on the area and perimeter. (The mark area and

perimeter values are displayed after the vision test is complete.) Return the tolerance to the original value after the

data is obtained.

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Creating and setting the data

7.4 Vision parameters

In the list on the [Mark]-[Vision] tab, set the following parameters used for mark recognition.

Vision parameters

64432-L3-20

A: Surface Type

This specifies the bright and dark relation between the mark surface and the surrounding area. Select "NonReflect" when

the mark is darker than the surrounding area. Select "Reflect" when the mark is brighter than the surrounding area as

shown below.

NonReflect

Board is brighter than mark.

Reflect

Mark is brighter than Board.

Setting

Brightness

comparison

Image

Mark

Surface Type setting

63423-L3-00

B: Algorithm Type

There are 5 algorithm types selectable for mark recognition.

Normal

In typical recognition, all types of marks should be set to "Normal". Try setting to other parameters if the mark cannot

be recognized with the "Normal" setting.

Special 1

Select this if the mark cannot be recognized with the "Normal" setting.

Special 2

Select this if the mark which cannot be recognized with the "Normal" setting has a cutout area.

PTRN Outline, PTRN GrayLev, PTRN Whole

Select these parameters when the "Shape Type" parameter is set to "Pattern". For more details, refer to "2. Pattern

matching" in Chapter 6.

C: Mark Threshold

This is the threshold level for the binary image used to recognize the mark. An optimum threshold level can be found in

the Mark Adjust mode explained later in this section.

D: Tolerance

This specifies a tolerance percentage for the mark size when the mark is recognized with the vision camera. (Typically

this should be set to "30".)

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Creating and setting the data

E, F: Search Area X, Search Area Y

As a general guide, set this parameter to the mark diameter plus 3mm. For example, when the mark diameter is 1mm, set

this parameter to "4mm" as shown below. If other marks (such as resist, silk print, other patterns) exist in this search area,

set the search area X and Y separately or make the "Search Area" setting smaller.

Pattern

1mm

4mm

2.5mm

Search Area

Mark

63424-L3-00

CAUTION

When a "0" is entered in Mark Search Area Y, marks are recognized within the square of Mark Search Area X.

G to K: Light level

Lighting for recognizing a mark is divided into several zones. The light level in each zone is displayed here. Optimum

light levels can be found in the Mark Adjust mode explained later.

L, M: Cut Outer Noise, Cut Inner Noise

When the mark image is digitized and shown in binary (black and white), noise may appear outside or inside the mark.

In this case, adjusting these parameter values in the Mark Adjust mode (described later) can cut the noise.