Omron Microscan LVS 7000 Operation Manual page 61

Sector Type 6: Delta E
The Delta E module detects color variations by comparing the trained color (also called the Golden color) to the
image color currently displayed in the field of view. The Delta E module continuously calculates the average
L*a*b* values of all the pixels within a sector according to CIE 2000 specifications. This sector type requires the
use of a color camera.
To use the Delta E sector type, follow the steps below.
1. Select "Delta E." The Scoring box appears, allowing you to perform the following options (see below).
Warning
Passing
Actual
Relearn button
LVS-7000 Operations Manual Version 5.6.X
Indicates an early warning of diminishing quality in the color image. The operator
must take action to improve the Delta E score. Minimum value is 0.0 and maximum
value is 9.8 with one decimal place allowed.
Represents what Delta E grade is considered to "pass;" it is the maximum
acceptable deviation of color. Any value higher than this setting is considered an
error. Minimum value is 0.0 and maximum value is 9.8 with one decimal place
allowed.
Represents the Delta E value calculated based on the currently measured L*a*b*
value.
Click this button to re-train the Golden color image with the color image in the field
of view. The web must be moving to use this option.
Note: Ctrl+L is a keyboard shortcut for the Relearn button. After pressing Ctrl+L,
the system will accept the next image it sees within each Blemish and Delta E
sector and saves the image as the Golden image. This shortcut is available only
when the system is in Run mode.
IMPORTANT: After pressing Ctrl+L, a popup message will appear for users without
administrative rights. The user must enter an administrator user name and
password for the command to take effect. The golden image that is recorded is the
image after the authorized user name and password is entered.
LVS-7000 Operations Manual Version 5.6.X
Page 61 of 187