Advantech VisionNavi User Manual page 32

Flips the image horizontally, vertically, diagonally.
Image rotation
Rotates the image in any direction.
Polar coordinate transformation
Convert the image to polar coordinates.
It is used for recognition of letters stated on a circular object.
Processing condition
[Target]
All around
···················Perform polar coordinate conversion for 360 °.
Specified angle
···················Perform polar coordinate conversion for the range of the specified
angle.
[Rotation]
When converting polar coordinates, specify the direction as positive / negative with
clockwise as positive.
[Diameter dir.]
Specify the radial direction with polar or negative polar coordinates.
[Overlapped range]
When performing polar coordinate conversion targeting the entire circumference,
conversion is performed with the specified angle overlapped. Then you can detect
the joint between the start angle and the end angle.
[Width of output img]
Specify the width of the image after polar coordinate conversion.
[Height of output img]
Specify the height of the image after polar coordinate conversion. Trapezoidal shape
correction
Trapezoidal shape correction
Specify the trapezoid shape, and perform projective transformation correction so that
the area becomes a rectangle.
Processing condition
[Aspect ratio]
Adjust the aspect ratio of the output image.
[Margin ratio]
If you want to include the margin outside the range specified in the area setting as the
output image, you can set the ratio.
Reduce domain
The area extracted by the processing by the previous tool is set as the subsequent
processing area.
It is possible to generate complicated shapes that are difficult to set in areas setting
by drawing and areas that change for each image.
By narrowing down the area, you can expect to shorten the processing speed in sub-
sequent tools as well as perform powerful image processing such as blob analysis
(extraction of shape feature amount etc.) and morphology processing (expansion /
contraction processing etc.).
Just before this tool, arrange a tool that detects a specific area with the [Gray scale
binarization area] tool or the [Substance / Spot inspection] tool.
Processing condition
VisionNavi User Manual 26