NAME:

bpass

PURPOSE:

Implements a real-space bandpass filter which suppress

pixel noise and long-wavelength image variations while

retaining information of a characteristic size.



CATEGORY:

Image Processing

CALLING SEQUENCE:

res = bpass( image, lnoise, lobject )

INPUTS:

image: The two-dimensional array to be filtered.

lnoise: Characteristic lengthscale of noise in pixels.

Additive noise averaged over this length should

vanish. MAy assume any positive floating value.

lobject: A length in pixels somewhat larger than a typical

object. Must be an odd valued integer.

OUTPUTS:

res: filtered image.

PROCEDURE:

simple wavelet convolution yields spatial bandpass filtering.

NOTES:-NAME:

　　　　　　　　　bpass

　　PURPOSE:

　　　　　　　　　Implements a real-space bandpass filter which suppress

　　　　　　　　　pixel noise and long-wavelength image variations while

　　　　　　　　　retaining information of a characteristic size.

　

　　CATEGORY:

　　　　　　　　　Image Processing

　　CALLING SEQUENCE:

　　　　　　　　　res = bpass( image, lnoise, lobject )

　　INPUTS:

　　　　　　　　　image:　The two-dimensional array to be filtered.

　　　　　　　　　lnoise: Characteristic lengthscale of noise in pixels.

　　　　　　　　　　　　　Additive noise averaged over this length should

　　　　　　　　　　　　　vanish. MAy assume any positive floating value.

　　　　　　　　　lobject: A length in pixels somewhat larger than a typical

　　　　　　　　　　　　　object. Must be an odd valued integer.

　　OUTPUTS:

　　　　　　　　　res:　　filtered image.

　　PROCEDURE:

　　　　　　　　　simple　wavelet　convolution yields spatial bandpass filtering.

　　NOTES: