Next: Morphology, Previous: Features, Up: Guile-CV [Contents][Index]

The Guile-CV procedures and methods to filter images.

`im-gaussian-blur`

`im-gaussian-blur-channel`

`im-gaussian-gradient`

`im-gaussian-gradient-channel`

- Procedure:
**im-gaussian-blur***image sigma* - Procedure:
**im-gaussian-blur-channel***channel width height sigma* -
Returns a new image or channel.

The new image or new channel is the result of the computation of the Gaussian blurring, also known as the Gaussian smoothing, by means of a convolution of

`image`or`channel`with a 2D Gaussian function, where`sigma`is the standard deviation of the Gaussian distribution.

- Procedure:
**im-gaussian-gradient***image sigma* - Procedure:
**im-gaussian-gradient-channel***channel width height sigma* -
Returns a new image or channel.

The new image or new channel is the result of the computation of the strength of the first order partial derivatives by means of a convolution of

`image`or`channel`with the first order derivative of a 2D Gaussian function, where`sigma`is the standard deviation of the Gaussian distribution.