Minimum/Maximum¶

std.
Minimum
(clip clip[, int[] planes=[0, 1, 2], float threshold, bint[] coordinates=[1, 1, 1, 1, 1, 1, 1, 1]])¶ Replaces each pixel with the smallest value in its 3x3 neighbourhood. This operation is also known as erosion.
 clip
 Clip to process. It must have integer sample type, and bit depth between 8 and 16. If there are any frames with float samples or bit depth greater than 16, an error will be returned.
 planes
 Specifies which planes will be processed. Any unprocessed planes will be simply copied.
 threshold
 Allows to limit how much pixels are changed. Output pixels will not
become less than
input  threshold
. The default is no limit.  coordinates
Specifies which pixels from the 3x3 neighbourhood are considered. If an element of this array is 0, the corresponding pixel is not considered when finding the minimum value. This must contain exactly 8 numbers.
Here is how each number corresponds to a pixel in the 3x3 neighbourhood:
1 2 3 4 5 6 7 8

std.
Maximum
(clip clip[, int[] planes=[0, 1, 2], int threshold=65535, int[] coordinates=[1, 1, 1, 1, 1, 1, 1, 1]])¶ Replaces each pixel with the largest value in its 3x3 neighbourhood. This operation is also known as dilation.
 clip
 Clip to process. It must have integer sample type, and bit depth between 8 and 16. If there are any frames with float samples or bit depth greater than 16, an error will be returned.
 planes
 Specifies which planes will be processed. Any unprocessed planes will be simply copied.
 threshold
 Allows to limit how much pixels are changed. Output pixels will not
become greater than
input + threshold
. With the default value of 65535 there is no limit.  coordinates
Specifies which pixels from the 3x3 neighbourhood are considered. If an element of this array is 0, the corresponding pixel is not considered when finding the maximum value. This must contain exactly 8 numbers.
Here is how each number corresponds to a pixel in the 3x3 neighbourhood:
1 2 3 4 5 6 7 8