entropy1__ ( Image : ImageEntropy : Width, Height : )
Calculate the entropy of gray values within a rectangular window.
entropy1__ calculates the entropy of gray values in the
image Image within a rectangular mask of size
(Height, Width). The resulting image is
returned in ImageEntropy, in which the entropy is
multiplied by 32. If the parameters Height and
Width are even, they are changed to the next larger odd
value. At the image borders the gray values are mirrored.
Parameters
Image (input_object)
|
image(-array) -> object : byte
|
Image for which the entropy is to be calculated. |
ImageEntropy (output_object)
|
image(-array) -> object : byte
|
Entropy image. |
Width (input_control)
|
extent.x -> integer
|
Width of the mask in which the entropy is calculated. |
Default value: 9 |
List of values: 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25 |
Suggested values: 3, 5, 7, 9, 11, 13, 15 |
Restriction: (3 <= Width) && odd(Width) |
Height (input_control)
|
extent.y -> integer
|
Height of the mask in which the entropy is calculated. |
Default value: 9 |
List of values: 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25 |
Suggested values: 3, 5, 7, 9, 11, 13, 15 |
Restriction: (3 <= Height) && odd(Height) |
Example
read_image(:Image:'fabrik':) >
disp_image(Image:::)
entropy1__(Image:Entropy1:9,9:) >
disp_image(Entropy1:::).
Result
entropy1__ returns TRUE if all parameters are correct.
If the input is empty the behaviour can be set via
set_system(::'no_object_result',<Result>:). If
necessary, an exception is raised.
Possible Successors
disp_image
Alternatives
entropy2__
See also
energy__,
entropy2__
Copyright © 1996-1997 MVTec Software GmbH