Measurement Parameters (High-precision Defects/Contamination Detection)

Measurement Parameters (Precise Defect)

This item specifies the judgement condition for measurement results.Measurement parameters can be changed as needed to address unstable measurement results or to increase the processing speed.

In the Item Tab area, tap [Measurement].

Set the detection parameters.

Measurement parameters - "Defect size" area

Setting item	Set value [Factory default]	Description
Size X	4 to 64 [16]	Specify the X-axis size of defects/contamination to be detected.The higher this value, the higher the degree of defects for large defects. Specify in units of pixels.
Size Y	4 to 64 [16]	Specify the Y-axis size of defects/contamination to be detected.The higher this value, the higher the degree of defects for large defects.Specify in units of pixels.
Sampling interval X	1 to 64 [2]	Specify the interval for creating elements along the X axis.The smaller this value, the greater the defect detection performance, but the slower the processing speed.Specify in units of pixels.
Sampling interval Y	1 to 64 [2]	Specify the interval for creating elements along the Y axis.The smaller this value, the greater the defect detection performance, but the slower the processing speed.Specify in units of pixels.
Comparing interval X	1 to 32 [10]	Set the number of neighboring elements compared with when the degree of defect is calculated,For example, if the Sampling interval X is set to 4 and the comparing interval X is set to 2, comparison is with separate elements of 4 x 2 = 8 pixels along the X axis.
Comparing interval Y	1 to 32 [10]	Set the number of neighboring elements compared with when the degree of defect is calculated,For example, if the sampling interval Y is set to 4 and the comparing interval Y is set to 2, comparison is with separate elements of 4 x 2 = 8 pixels along the Y axis.
Direction	X(circumferential) Y(radial) Diagonal	Set the direction for detecting defects. The smaller the direction setting count, the shorter the processing time.

Note

Measurement mode
In Precise Defect measurement, the measurement mode depends on the number of registered region figures and their types.The way to make elements depends on the measurement mode. The relationship between the figure and measurement mode is as in the table below.
Single figure
Multiple figures
Line
Circumference
Arc
Ellipse
Rectangle
Polygon
Measurement mode
Line
Wide circle and arc
Wide circle and arc
Region
Region
Region
Region
Line mode:
- The direction parallel to the measurement region straight line is the X axis and the direction perpendicular is the Y axis.The shape of elements is rectangular. The element width and length are the number of pixels specified with the element size X and Y.
Wide circle and arc mode:
- The circumferential direction along the measurement region wide circle (arc) is the X axis and the radial direction is the Y axis.The shape of elements is fan-shaped. If the circumference length of the wide circle (arc) of the measurement region is set to N, the element circumferential direction width is 360 degrees x the element size X / N. The element radial direction width is the number of pixels specified with the element size Y. The element circumferential direction width is defined as an angle, so the closer the element to the outer circumference, the larger the element.
Region mode:
- The direction parallel to the measurement region is the X axis and the direction perpendicular is the Y axis.The shape of elements is rectangular.The element width and length are the number of pixels specified with the element size X and Y.

	Single figure	Multiple figures
Line	Circumference	Arc	Ellipse	Rectangle	Polygon
Measurement mode	Line	Wide circle and arc	Wide circle and arc	Region	Region	Region	Region

If necessary, set the value of each item in the "Measurement condition" area.

Value input method:

See the "User's Manual", "Inputting Values"

The "Area meas. LV" can be set also by dragging the slider or by tapping the buttons at the ends of the slider.

For color cameras:

For monochrome cameras:

Setting item	Set value [Factory default]	Description
Defect color (for monochrome cameras only)	Black	Select this value when defects look blackish compared to the background.
	White	Select this value when defects look whitish compared to the background.
	[Both white / black]	Select this value when the brightness of defects is not known.
Area measurement	Checked [Unchecked]	Place a check when you want to measure the size of defects.This item can divide the high defect detection regions into groups and output the surface and center of gravity coordinates of the group with the largest area. However, when only one region is specified with "Wide line", "Wide circle", or "Arc", area measurement is not possible.
Area meas. LV	0 to 999 [100]	If you place a heck at Area Measurement, set defect level counted in the defect area.

When the setting has been changed, tap [Measurement] in the Detail area to verify whether measurements can be made correctly.

Set up the judgement condition.

Measurement - "Judgement condition" area

Setting item	Set value [Factory default]	Description
Defect judge	0 to 999 [100]	Specify the upper limit for defect judgement. (The lower limit is fixed at 0.) When "30" is set, the OK value should be within the range of 0 to 30.
Area judge	0 to [999999999.9999]	Specify the maximum defect area. A_MAX: 307,200 for a 0.3-megapixel camera, 1,920,000 for a 2-megapixel camera, 4,320,000 for a 5-megapixel camera

If necessary, set the display conditions for displayed images.

Measurement parameters - "Display setting" area

Setting item	Set value [Factory default]	Description
Profile	[Checked] Unchecked	Set the profile display. The maximum degree of defect along the X(circumferential) and Y(radial) is displayed with red lines. If you tap in the measurement region on the image area, the profile in the XY directions from this point is displayed with yellow lines.
Element	Checked [Unchecked]	Set the comparison element display. Elements are created automatically during measurement.The density is calculated for each element and the position of defects/contamination is detected from the degree of their variation.