xy_to_polar ( ImageXY : ImagePolar : Row, Column, Width, Height : )
Transform an image to polar coordinates
xy_to_polar transforms an image in cartesian coordinates
to an image in polar coordinates. The size of the resulting image
is selected with Width and Height.
Width determines the angular resolution, while
Height determines the resolution of the radius.
Row and Column determine the center of the
polar coordinate system in the original image ImageXY.
This point is mapped to the upper row of ImagePolar.
A point (x',y') in the result image corresponds to the point (x,y)
in the original image in the following manner:
x = cos(x') * y' + Column
y = sin(x') * y' + Row.
Parameters
ImageXY (input_object)
|
image(-array) -> object : byte
|
Input image in cartesian coordinates. |
ImagePolar (output_object)
|
image(-array) -> object : byte
|
Result image in polar coordinates. |
Row (input_control)
|
point.y -> integer
|
Row coordinate of the center of the coordinate
system. |
Default value: 100 |
Suggested values: 0, 10, 100, 200 |
Range of values: 0 <= Row <= 512 |
Minimum increment: 1
|
Recommended increment: 1
|
Column (input_control)
|
point.x -> integer
|
Column coordinate of the center of the
coordinate system. |
Default value: 100 |
Suggested values: 0, 10, 100, 200 |
Range of values: 0 <= Column <= 512 |
Minimum increment: 1
|
Recommended increment: 1
|
Width (input_control)
|
extent.x -> integer
|
Width of the result image. |
Default value: 314 |
Suggested values: 100, 200, 157, 314, 512 |
Range of values: 2 <= Width <= 512 |
Minimum increment: 1
|
Recommended increment: 10
|
Height (input_control)
|
extent.y -> integer
|
Height of the result image. |
Default value: 200 |
Suggested values: 100, 128, 256, 512 |
Range of values: 2 <= Height <= 512 |
Minimum increment: 1
|
Recommended increment: 10
|
Example
read_image(:Image:'affe':) >
disp_image(Image:::) >
xy_to_polar(Image:PolarImage:100,100,314,200:).
disp_image(PolarImage:::) >
Alternatives
image_transform__
See also
image_transform__
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