Filter image

Applies simple filtering or scaling algorithms on an image. For more complex operations see the more specialized image manipulation nodes

Algorithms:

• abs

  Computes absolute value or complex magnitude of image

• angle

  Gives the phase angle of a complex image

• center image

  Shifts image so that center of mass lies in center of image

• clamp

  Restricts the output values to a given maximum/minimum

  minimum:

  The minimum output value that can be passed through

  maximum:

  The maximum output value that can be passed through

• gaussian

  Two-dimensional Gaussian filter

  sigma-x:

  Standard deviation of gaussian filter along X-axis

  sigma-y:

  Standard deviation of gaussian filter along Y-axis

  border mode:

  Determines how the array borders are handled

  k:

  Value outside image borders when method constant is used.

• hessian determinant

  Computes an approximation of the determinant of the hessian matrix for each pixel.

  sigma:

  Standard deviation of gaussian kernel (default 3.0) used for calculating Hessian.

  Approximation is not reliable for sigma < 3.0

• imag

  Gives the imaginary part of a complex image

• integral image

  Creates the integral image of the input.

  An integral image contains at coordinate (m,n) the sum of all values above and to the left of it.

  S(m,n) = sum(im[0:m, 0:n])

• normalize

  Adds a (positive) scale and offset so that smallest/highest value in image becomes 0 and 1 respectively.

  Operates on each channel separately

  minimum:

  Minimum value after normalization

  maximum:

  Maximum value after normalization

• real

  Gives the real valued part of a complex image

• scale/offset

  Adds a scale and/or an offset to each channel equally

  scale:

  Scale factor applied to image before offset

  offset:

  Offset applied to image after scale

• to integer

  Converts all channels into integer data

Input ports:

source : image

source image to filter

Output ports:

result : image

result after filtering

Configuration:

Algorithm (algorithm)

(no description)

scale (scale)

(no description)

k (k)

(no description)

sigma-y (sigma-y)

(no description)

sigma-x (sigma-x)

(no description)

maximum (maximum)

(no description)

border mode (border mode)

(no description)

minimum (minimum)

(no description)

offset (offset)

(no description)

sigma (sigma)

(no description)

Some of the docstrings for this module have been extracted from the scikit-image library and are covered by their respective licenses.

class node_general_filters.GeneralImageFiltering