# Filter image¶

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

Documentation

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

Definition

Input ports

source

image

source image to filter

Output ports

result

image

result after filtering

Configuration:
Algorithm (algorithm)

(no description)

border mode (border mode)

(no description)

k (k)

(no description)

maximum (maximum)

(no description)

minimum (minimum)

(no description)

offset (offset)

(no description)

scale (scale)

(no description)

sigma (sigma)

(no description)

sigma-x (sigma-x)

(no description)

sigma-y (sigma-y)

(no description)

class node_general_filters.GeneralImageFiltering[source]